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A N A M E R I C A N N A T I O N A L S T A N D A R D
Unified Inch Screw Threads(UN and UNR Thread Form)
ASME B1.1-2003[Revision of ASME B1.1-1989 (R2001)]
A N A M E R I C A N N A T I O N A L S T A N D A R D
UNIFIED INCHSCREW THREADS
(UN and UNR Thread Form)
ASME B1.1-2003[Revision of ASME B1.1-1989 (R2001)]
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Date of Issuance: September 30, 2004
The 2004 edition of this Standard is being issued with an automatic addenda subscription service.The use of addenda allows revisions made in response to public review comments or committeeactions to be published as necessary. This Standard will be revised when the Society approves theissuance of a new edition.
There will be no written interpretations of the requirements of this Standard issued to this edition.
ASME is the registered trademark of The American Society of Mechanical Engineers.
This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards. The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate. The proposed code or standard was madeavailable for public review and comment that provides an opportunity for additional public input from industry, academia,regulatory agencies, and the public-at-large.
ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device, or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with any
items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent, nor assume any such liability. Users of a code or standard are expresslyadvised that determination of the validity of any such patent rights, and the risk of infringement of such rights, isentirely their own responsibility.
Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.
ASME accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies, which precludes the issuance of interpretations by individuals.
No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,
without the prior written permission of the publisher.
The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990
Copyright © 2004 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERS
All rights reservedPrinted in U.S.A.
CONTENTS
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viCommittee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.2 Unified Screw Thread Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.3 UN and UNR Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.4 Interchangeability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.5 Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.6 Reference Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.7 Acceptability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.8 Reference Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.9 Units of Measure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.10 Federal Government Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Screw Thread Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.2 Basic Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.3 Design Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.4 Formulas and Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3 Screw Thread Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.1 Thread Series Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.2 Order of Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.3 Coarse-Thread Series Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.4 Fine-Thread Series Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.5 Extra-Fine-Thread Series Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.6 Constant-Pitch Thread Series Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.7 Fine Threads for Thin-Wall Tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Screw Thread Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364.1 Thread Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364.2 Combinations of Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5 Screw Thread Allowance and Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365.1 Allowance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365.2 Pitch Diameter Tolerance, All Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365.3 Special Lengths of Engagement, LE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375.4 Minor Diameter Tolerance and Allowance for External Threads . . . . . . . . . . 545.5 Major Diameter Tolerance for Internal Threads . . . . . . . . . . . . . . . . . . . . . . . . . . 545.6 Minor Diameter Tolerance and Length of Engagement for Internal
Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 555.7 Disposition of Allowance and Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 555.8 Formulas for Allowance and Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 555.9 Lead and Flank Angle Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 585.10 Coated or Plated Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 585.11 Circular Runout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
6 Screw Thread Designation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 586.1 Basic Method of Designating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
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6.2 Method of Designating Coated Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 616.3 Method of Designating Left-Hand Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 626.4 Method of Designating UNS Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 626.5 Designations for Other Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 626.6 Method of Designating Threads Having Special Length of
Engagement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 636.7 Method of Designating Threads Having Modified Crests. . . . . . . . . . . . . . . . . 63
7 Dimensional Accommodation of Coating or Plating for 60-deg Threads . . . . . . . . . . 647.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 647.2 Material Lifts for Coated Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 647.3 Dimensional Effects of Coating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 647.4 External Thread With Allowance Available for Coating . . . . . . . . . . . . . . . . . . 647.5 External Thread With No Allowance for Coating . . . . . . . . . . . . . . . . . . . . . . . . 647.6 Internal Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 667.7 Electrodeposited Coatings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 677.8 Other Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
8 Standard Series Threads (UN/UNR) and Limits of Size for Standard Seriesand UNS/UNRS Series Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
8.1 Standard Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 678.2 Limits of Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 678.3 Formulas for Limits of Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 678.4 Example of Calculations From Formulas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
9 Lead and Angle Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 689.1 Lead and Flank Angle Acceptance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
10 Formulas and Symbols for Thread Form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6910.1 Thread Form Formulas and Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
11 Tables of Basic Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7011.1 Table Content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7011.2 Thread Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Figures1 Basic Profile for UN and UNR Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Disposition of Diametral Tolerances, Allowance, and Crest Clearance for
Unified Inch Screw Thread Classes 1A, 2A, 1B, and 2B . . . . . . . . . . . . . . . . . . . . . 43 Disposition of Diametral Tolerances and Crest Clearances for Unified Inch
Screw Thread Classes 3A and 3B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Ratio of Pitch Diameter Change to Thickness of Coating on 60-deg
Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 655 Effect of Electrodeposited Coatings on 60-deg External Threads . . . . . . . . . . . . . . . 666 Application of General Thread Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Tables1 Standard Series Threads (UN/UNR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Limits of Size for Standard Series Threads (UN/UNR) . . . . . . . . . . . . . . . . . . . . . . . . 83 Allowable Variations in Lead and Equivalent Change in Functional
Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 384 Increments in Pitch Diameter Tolerance — Class 2A . . . . . . . . . . . . . . . . . . . . . . . . . . 565 Thread Form Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 596 Basic Dimensions for Coarse-Thread Series (UNC/UNRC) . . . . . . . . . . . . . . . . . . . . 727 Basic Dimensions for Fine-Thread Series (UNF/UNRF) . . . . . . . . . . . . . . . . . . . . . . . 738 Basic Dimensions for Extra-Fine-Thread Series (UNEF/UNREF) . . . . . . . . . . . . . . . 749 Basic Dimensions for 4-Thread Series (4-UN/4-UNR) . . . . . . . . . . . . . . . . . . . . . . . . . 75
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10 Basic Dimensions for 6-Thread Series (6-UN/6-UNR) . . . . . . . . . . . . . . . . . . . . . . . . . 7611 Basic Dimensions for 8-Thread Series (8-UN/8-UNR) . . . . . . . . . . . . . . . . . . . . . . . . . 7712 Basic Dimensions for 12-Thread Series (12-UN/12-UNR) . . . . . . . . . . . . . . . . . . . . . . 7913 Basic Dimensions for 16-Thread Series (16-UN/16-UNR) . . . . . . . . . . . . . . . . . . . . . . 8114 Basic Dimensions for 20-Thread Series (20-UN/20-UNR) . . . . . . . . . . . . . . . . . . . . . . 8315 Basic Dimensions for 28-Thread Series (28-UN/28-UNR) . . . . . . . . . . . . . . . . . . . . . . 8416 Basic Dimensions for 32-Thread Series (32-UN/32-UNR) . . . . . . . . . . . . . . . . . . . . . . 8517A Outline Guide for Determining Limits of Size of External Threads . . . . . . . . . . . . 8617B Outline Guide for Determining Limits of Size of Internal Threads . . . . . . . . . . . . . 8618A Examples of External Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8718B Examples of Internal Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9019 Allowable Variation in 30 deg Basic Half Angle of External and Internal
Screw Threads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9220 General Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Nonmandatory AppendicesA Terminology and Identification of Unified Inch Screw Threads . . . . . . . . . . . . . . . . 95B Thread Strength Design Formulas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97C Unified Inch Screw Threads — Metric Translation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98D Special Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134E Changes to ASME B1.1-1989 Tables 3A and 3B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
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FOREWORD
This Standard is the outgrowth of and supersedes previous editions that were published asB1-1924, B1.1-1935, B1.1-1949, B1.1-1960, B1.1-1974, B1.1-1982, and B1.1-1989. Throughout suchdevelopment, special attention has been given to the practical aspects of thread standardization,and many details of the current Standard result from studies and tests based on user problems.For example, there was disclosed the need for free assembly in high-production industries andthe desirability of making some provision for threads that require a coating. The tolerance classes2A/2B were developed to meet these two major requirements as well as to provide a generalstandard for externally and internally threaded fasteners. Thread symbols and nomenclaturewere changed to be expressed according to ASME B1.7. Thread acceptability now refers toASME B1.3.
This issue includes the following changes to ASME B1.1-1989:(a) The revision of some of the values in Table 2. These revisions are the result of the application
of the consistent eight place decimal and rounding rules established in ASME B1.30-1992 thatwere mandated for use in all new and future revisions of ASME B1 documents. ASME B1.30 wasdeveloped under the direction of the B1 Committee as the basis for rounding of decimal valuesassociated with the computation of screw thread dimensions. Using the thread calculation formu-las in paras. 5 and 8 of this document and following the rounding rules of B1.30 all parties usinga calculator or standard computer spreadsheet program will derive precisely the same values.
Table E-1 of Nonmandatory Appendix E identifies the thread sizes in Table 2 that have beenrevised and lists the dimensions from the ASME B1.1-1989 standard. The majority of the dimen-sional changes are within ± 0.0001 in.
Paragraph 8.2.1 states that both the values in Tables 2 and E-1 should be considered acceptableuntil a future revision of this standard makes the values in Table 2 the only acceptable values.
(b) Former Table 3B has been moved to Nonmandatory Appendix D. This table providescalculated values for various UNS (Unified Specials). ASME B1 strongly urges the adoption ofthe standard thread sizes in Table 2 whenever possible instead of those listed in Table D-1.
(c) Former Tables 20 through 30 have been eliminated because the allowances and tolerancescontained in them was determined to be redundant with data provided in Table 2.
(d) Former Tables 31 through 40 have been moved to Nonmandatory Appendix D and wererenamed Tables D-2 through D-11. These tables were used in the past for the quick calculationof special threads. In some cases the derived values resulted in values that differ from thosederived by use of the formulas in paras. 5 and 8 of ASME B1.1. All future special threads shouldbe based on calculations in paras. 5 and 8 in this document using the rounding rules in ASMEB1.30 to ensure uniformity and consistency.
(e) All references to percent of thread engagement have been eliminated from this document.Past changes in the thread form designation of the “basic” thread height from 0.750H to 0.625Hconfused the calculation of percent of thread engagement. This calculation has been used in thepast for threaded products users to determine drill size selection. It is now recommended thatusers select a drill size that will result in a hole size that lies between the maximum and minimumsize of the internal thread’s minor diameter shown in the tables included in this Standard.
(f) The definition of “functional diameter” has been included in this document and the termhas been added in Table 2 in the same column as “pitch diameter” since both characteristics havethe same limits of size.
(g) The effects of coating on threads have been explained in more depth in para. 7.The Unified Screw Threads Standard is an integrated system of threads for fastening purposes
in mechanisms and structures. Its outstanding characteristic is general interchangeability ofthreads, achieved through the standardization of thread form, diameter-pitch combinations, andlimits of size.
The Standard has as its original basis the work done more than a century ago by WilliamSellers in the United States and Sir Joseph Whitworth in Great Britain. Throughout the intervening
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years there have been many further developments and revisions, culminating in the system ofUnified Threads approved and adopted for use by all inch-using countries.
The achievements represented by ASME B1.1 in development, standardization, and unificationare the result of cooperation and coordination of many organizations, including The AmericanSociety of Mechanical Engineers, Society of Automotive Engineers, National Institute of Scienceand Technology (formerly National Bureau of Standards), Committee B1, the former NationalScrew Thread Commission, the former Interdepartmental Screw Thread Committee, British Stan-dards Institution, Canadian Standards Association, and American National Standards Institute.
Unification of screw thread standards received its impetus from the need for interchangeabilityamong the billions of fasteners used in the complex equipment of modern technology and madein different countries. Equally important, however, are international trade in mechanisms of allkinds and the servicing of transportation equipment which moves from country to country. Thesehave made unification not only highly advantageous, but practically essential. In sizes 1⁄4 in. andlarger, complete unification of certain thread series and six tolerance classes was signaled by thesigning of an accord on November 18, 1948. Since that time, further unification has been extendedinto smaller sizes. Working through Technical Committee No. 1 of the International Organizationfor Standardization (ISO), the unified standard was adopted as an ISO inch screw thread standard,ISO 5864, parallel to the ISO metric screw thread system. Both systems have a common basicprofile. The standard was subject to Quadripartite Standardization Agreement (QSTAG) 247, inthe ABCA Army Standardization Program of America, Britain, Canada, and Australia.
Suggestions for improvement of this Standard will be welcomed. They should be sent to theAmerican Society of Mechanical Engineers at ASME International, Three Park Avenue, New York,NY 10016-5990, U.S.A.
ASME B1.1-2003 was approved by the American National Standards Institute (ANSI) on March27, 2003.
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ASME STANDARDS COMMITTEE B1Standardization and Unification of Screw Threads
(The following is the roster of the Committee at the time of approval of this Standard.)
OFFICERS
A. L. Barrows, ChairD. S. George, Vice Chair
R. L. Crane, Secretary
COMMITTEE PERSONNEL
G. L. Allen, L. S. Starret Co.A. L. Barrows, Kennametal — IPGM. H. Bernier, Standard Nut and BoltF. G. Calderone, Quality Systems ImplementersR. L. Crane, The American Society of Mechanical EngineersL. N. Dixon, Jr., General ElectricR. Dodge, Pennoyer-Dodge Co.G. A. Flannery, Mercury Gage Co.D. Skierski, Alternate, Mercury Gage Co.H. N. Frost, Defense Supply Center PhildelphiaJ. O. Gehret, Vermont Thread GageD. S. George, Ford Motor Co.J. R. Gervasi, Kerr Lakeside Inc.J. Greenslade, Greenslade & Co.J. Vance, Alternate, Greenslade and Co.R. J. Hukari, SPS TehnologiesL. C. Johnson, The Johnson Gage Co.D. D. Katz, Precision Fittings
SUBCOMMITTEE 1 — UNIFIED SCREW THREADS
A. L. Barrows, Chair, Kennametal — IPGD. Miskinis, Vice-Chair, Kennametal — IPGM. H. Bernier, Standard Nut and BoltM. Cox, Frank J. Cox Sales, Ltd.L. N. Dixon, Jr., General ElectricH. N. Frost, Defense Supply Center PhiladelphiaD. S. George, Ford Motor Co.J. R. Gervasi, Kerr Lakeside, Inc.J. Greenslade, Greenslade & Co.J. Vance, Alternate, Greenslade & Co.D. H. Honsinger, ConsultantR. J. Hukari, SPS TehnologiesL. C. Johnson, The Johnson Gage Co.J. M. Kane, Boeing
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R. P. Knittel, Leitech–U.S., Ltd.B. Larzelere, Deltronic Corp.L. L. Lord, Caterpillar, Inc.R. L. Tennis, Alternate, Caterpillar, Inc.M. H. McWilliams, PMC Gage, Inc.D. Miskinis, Kennametal–IPGW. R. Newman, ConsultantM. W. Rose, Southern Gage, Inc.W. A. Watts, Alternate, Southern Gage, Inc.E. Schwartz, ConsultantR. H. Searr, ConsultantB. F. Sheffler, Dresser-Rand Co.A. D. Shepherd, Jr., Emuge Corp.A. G. Strang, ConsultantR. D. Strong, General Motors Corp.A. F. Thibodeau, Swanson Tool Manufacturing Co.R. E. Vincent, Jr., General Plug Manufacturing Co.C. J. Wilson, Industrial Fasteners InstituteF. W. Akstens, Alternate, Industrial Fasteners Institute
D. D. Katz, Precision FittingsR. P. Knittel, Leitech — U.S., Ltd.B. Larzelere, Deltronic Corp.L. L. Lord, ConsultantW. R. Newman, ConsultantE. Schwartz, ConsultantR. H. Searr, ConsultantB. F. Sheffler, Dresser-Rand Co.J. D. Smith, Hi-Shear Corp.R. D. Strong, GM Vehicle Engineering Ctr.A. F. Thibodeau, Swanson Tool Manufacturing, Inc.R. E. Vincent, Jr., General Plug Manufacturing Co.C. J. Wilson, Industrial Fasteners InstituteF. W. Akstens, Alternate, Industrial Fasteners Institute
ASME B1.1-2003
UNIFIED INCH SCREW THREADS
(UN AND UNR THREAD FORM)
1 GENERAL
1.1 Scope
This Standard specifies the thread form, series, class,allowance, tolerance, and designation for unified screwthreads. (In order to emphasize that unified screwthreads are based on inch modules, they may be denotedunified inch screw threads.) Several variations in threadform have been developed for unified threads; however,this Standard covers only UN and UNR thread forms.
For easy reference, a metric translation of this Stan-dard has been incorporated as Nonmandatory Appen-dix C. Nonmandatory Appendices A through E containuseful information that is supplementary to the sectionsof this Standard.
1.2 Unified Screw Thread Standards
The standards for unified screw threads published inthis Standard are in agreement with formal standardsof the International Organization for Standardizationfor diameter-pitch combinations, designations, and tol-erances for 60 deg triangular form inch screw threads.Unified screw threads had their origin in an accordsigned in Washington, D.C., on November 18, 1948, byrepresentatives of standardizing bodies of Canada, theUnited Kingdom, and the United States, and have subse-quently superseded American National screw threads.
1.3 UN and UNR Screw Threads
UNR applies only to external threads; the differencebetween UN and UNR threads, in addition to designa-tion, is that a flat or optional rounded root contour isspecified for UN threads, while only a rounded rootcontour is specified for UNR threads.
1.4 Interchangeability
Unified (UN/UNR) and its predecessor, AmericanNational screw threads, have substantially the samethread form, and threads of both standards having thesame diameter and pitch are mechanically interchange-able. The principal differences between these standardsrelate to the application of allowances, the variation oftolerances with size, differences in the amounts of pitchdiameter tolerances for external and internal threads,and differences in thread designations. Unified inch and
1
ISO metric screw threads are not mechanically inter-changeable.
1.5 Designations
Unified thread sizes (specific combinations of diame-ter and pitch) are identified by the letter combination“UN” in the thread symbol. In the unified standards,the pitch diameter tolerances for external threads differfrom those for internal threads; for this reason the letter“A” is used in the thread symbol to denote an externalthread and the letter “B,” an internal thread. Where theletters “U,” “A,” or “B” do not appear in the threaddesignation, the threads conform to the outdated Ameri-can National screw threads. Details regarding threaddesignations are given in para. 6.
1.6 Reference Documents
The latest issues of the following documents form apart of this Standard to the extent specified herein.
When the following American National Standardsreferred to in this Standard are superseded by a revisionapproved by the American National Standards Institute,Inc., the revision should apply.
ASME B1.2, Gages and Gaging for Unified Inch ScrewThreads
ASME B1.3, Screw Thread Gaging Systems for Dimen-sional Acceptability — Inch and Metric Screw Threads
ASME B1.7, Nomenclature, Definitions, and Letter Sym-bols for Screw Threads
ASME B1.30, Screw Threads — Standard Practices forCalculating and Rounding Dimensions
ASME B47.1, Gage BlanksASME B94.11, Twist DrillsASME Y14.5, Dimensioning and Tolerancing
Publisher: The American Society of Mechanical Engi-neers (ASME International), Three Park Avenue, NewYork, NY 10016-5990; Order Department: 22 LawDrive, Box 2300, Fairfield, NJ 07007-2300
ISO 68, General Purpose Screw Threads — Basic Profile
Publisher: International Organization for Standardiza-tion (ISO), 1 rue de Varembe, Case Postale 56, CH-1211, Geneve 20, Switzerland/Suisse
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
1.7 Acceptability
Acceptability of product threads shall be in accor-dance with ASME B1.3. Gages and gaging shall be inaccordance with ASME B1.2.
1.8 Reference Temperature
The reference temperature is 68°F for dimensionsdefined by this system.
1.9 Units of Measure
All dimensions in this Standard, including all tables,are in inches unless otherwise specified.
1.10 Federal Government Use
When this Standard is approved by the Departmentof Defense and federal agencies and is incorporated intoFED-STD-H28/2, Screw-Thread Standards for FederalServices, para. 2, the use of this Standard by the federalgovernment will be subject to all the requirements andlimitations of FED-STD-H28/2.
2 SCREW THREAD PROFILE
2.1 Scope
The basic profile and design profiles are defined inthis paragraph and are the basis of all thread dimensionsgiven in this Standard.
2.2 Basic Profile
The basic profile for UN screw threads is identical tothat for UNR screw threads and is shown in Fig. 1.Profile applies to an axial plane.
For reference, the basic profile for UN and UNR screwthreads is identical to that for ISO metric screw threadsshown in ISO 68.
2.3 Design Profiles
The design profiles define the maximum-material con-ditions for external and internal threads with no allow-ance and are derived from the basic profile. The designprofiles of both external and internal screw threads varyfrom the basic profile.
2.3.1 Design Profiles of External Threads. The designprofiles of external UN and UNR screw threads areincluded in Figs. 2 and 3. A flat root contour is specifiedfor UN threads; however, it is permissible to providefor some threading tool crest wear. Therefore, a roundedroot contour cleared beyond the 0.250P flat width of thebasic profile is optional. The rounded root also reducesthe rate of threading tool crest wear and improvesfatigue strength over that of a flat root thread.
(a) The root contour of external UNR screw threadsshown in Figs. 2 and 3 shall have a smooth, continuous,nonreversing contour with a radius of curvature not lessthan 0.10825318P at any point and shall blend tangen-tially into the flanks and any straight segment. At the
2
maximum-material condition, the point of tangencyshall be at a distance not less than 0.54126588P (0.625H)below the basic major diameter.
NOTE: The maximum full root radius is 0.14433757P, but this maybe exceeded when the root contour consists of a combination offlats and radii.
(b) The design profiles of external UN and UNR screwthreads have flat crests. However, in practice, productthread crests may be flat, or partially corner rounded.A rounded crest tangent at a 0.125P flat is shown as anoption in Figs. 2 and 3.
2.3.2 Design Profile of Internal Threads. The designprofile of the internal UN screw thread is included inFigs. 2 and 3 (there is no internal UNR screw thread).In practice, it is necessary to provide for some threadingtool crest wear; therefore, the root of the design profileis rounded and cleared beyond the 0.125P flat width ofthe basic profile.
2.4 Formulas and Symbols
The formulas and symbols pertaining to the basicprofile and the design profiles are given in para. 10.
3 SCREW THREAD SERIES
3.1 Thread Series Definition
Thread series are groups of diameter-pitch combina-tions distinguished from each other by the number ofthreads per inch applied to a series of specific diameters.There are two general series classifications: standardand special.
3.1.1 Standard Series. The standard series consistsof three series with graded pitches (coarse, fine, andextra fine) and eight series with constant pitches (4, 6,8, 12, 16, 20, 28, and 32 threads per inch). The standardseries is shown in Table 1. Limits of size are shown inTable 2. See para. 8 for limits of size.
3.1.2 Special Series. The special series consists of allthreads with diameter-pitch combinations that are notincluded in the standard series. When allowances andtolerances of special series threads are derived from uni-fied formulation as shown in para. 5, the threads aredesignated UNS or UNRS. If allowance and toleranceare not derived from unified formulation, the threadsare designated “SPL 60 degree Form.” See para. 6 fordetails of designation.
3.2 Order of Selection
Wherever possible, selection should be made fromTable 2, Standard Series — Unified Screw Threads, pref-erence being given to the coarse- and fine-thread series.Second choice; if the threads in the standard series inTable 2 do not meet the requirements of the design,
UNIFIED INCH SCREW THREADS ASME B1.1-2003
0.86602540P(H)
P
60 deg
30 deg
90 deg
Axis of screw thread
D bsc, d bsc
D2 bsc, d2 bsc
D1 bsc, d1 bsc
0.125P0.10825318P
(0.125H)
0.32475953P(0.375H)
0.54126588P(0.625H)
0.21650635P(0.25H)
0.250P
0.500P
0.500P
GENERAL NOTE: For standardization, values have been established based on a function of pitch, P. The thread valuesbased on a function of height, H, are used for reference only.
Fig. 1 Basic Profile for UN and UNR Screw Threads
special thread sizes should be selected from Table E-1 ofNonmandatory Appendix E and their limits calculatedusing the formulas in para. 8. The limits in Table D-1 ofNonmandatory Appendix D are for reference only andare not recommended for new applications.
3.3 Coarse-Thread Series Applications
The coarse-thread series (UNC/UNRC) is generallyused for the bulk production of screws, bolts, and nuts.It is commonly used in relatively low-strength materialssuch as cast iron, aluminum, magnesium, brass, bronze,and plastic, because the coarse-thread series providemore resistance to internal thread stripping than the fineor extra-fine series. Coarse-thread series are advanta-geous where rapid assembly or disassembly is required,or if corrosion or damage from nicks due to handlingor use is likely.
3.4 Fine-Thread Series Applications
The fine-thread series (UNF/UNRF) is commonlyused for bolts and nuts in high-strength applications.This series has less thread depth and a larger minor
3
diameter than coarse-thread series. Consequently, thin-ner walls are permitted for internal threads and morestrength is available to external threads than for coarse-thread series of the same nominal size. In order to pre-vent internal thread stripping, a longer length of engage-ment is required for fine-thread series than for coarse-thread series for thread materials of the same strengthlevels. However, for both fine- and coarse-thread series,length of engagement in tapped holes must be selectedto meet strength requirements. This also allows for fineradjustment in cases such as a slotted nut and cotter pinassembly.
3.5 Extra-Fine-Thread Series ApplicationsThe extra-fine-thread series (UNEF/UNREF) is used
particularly for equipment and threaded parts thatrequire fine adjustment, such as bearing retaining nuts,adjusting screws, etc., and for thin-wall tubing andthin nuts.
3.6 Constant-Pitch Thread Series ApplicationsThe various constant-pitch series (UN/UNR) with 4,
6, 8, 12, 16, 20, 28, and 32 threads per inch, given in
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
UNR contour, see para. 2.3.1(a)
Min
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1/2 allowance (external only)
Basic form
0.041667P
0.125P UN (maximum) minor diameter of external
For UNR threads, this root is defined as a continuous rounded contour with a radius not less than 0.10825318P. For UN threads this root may be flat. See para. 2.3.1.
1/2 PD tolerance on internal
1/2 PD tolerance on external
1/2 allowance (external)
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Min
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1 /2
tole
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1/2 tolerance on major diameter of internal
In practice, crests may be partially or fully rounded. See para. 2.3.1(b).
Internal Thread
External Thread
UN
R m
axim
um
min
or
dia
met
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tern
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30 deg
60 deg
0.125P
0.250P
GENERAL NOTE: Lead and angle tolerances are defined in para. 9.
Fig. 2 Disposition of Diametral Tolerances, Allowance, and Crest Clearance for Unified Inch Screw ThreadClasses 1A, 2A, 1B, and 2B
4
UNIFIED INCH SCREW THREADS ASME B1.1-2003
UNR contour, see para. 2.3.1(a)
UN (maximum) minor diameter or external
Min
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Max
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Basic form
0.041667P
0.125P
For UNR threads, this root is defined as a continuous rounded contour with a radius not less than 0.10825318P. For UN threads this root may be flat. See para. 2.3.1.
1/2 PD tolerance on internal1/2 allowance on (external)
Max
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1 /2
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of
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1/2 tolerance on major diameter of internal
In practice, crests may be partially or fully rounded. See para. 2.3.1(b).
Internal Thread
External Thread
UN
R m
axim
um
min
or
dia
met
er o
f ex
tern
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60 deg
0.125P
0.250P
30 deg
GENERAL NOTE: Lead and angle tolerances are defined in para. 9.
Fig. 3 Disposition of Diametral Tolerances and Crest Clearances for Unified Inch Screw ThreadClasses 3A and 3B
5
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 1 Standard Series Threads (UN/UNR)
Threads/in.
Series With GradedPitches
Basic ExtraNominal Size, in. Series With Constant PitchesMajor Course Fine Fine Nominal
Primary Secondary Diameter UNC UNF UNEF 4-UN 6-UN 8-UN 12-UN 16-UN 20-UN 28-UN 32-UN Size, in.
0 . . . 0.0600 . . . 80 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0. . . 1 0.0730 64 72 . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 . . . 0.0860 56 64 . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. . . 3 0.0990 48 56 . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4 . . . 0.1120 40 48 . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 . . . 0.1250 40 44 . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 . . . 0.1380 32 40 . . . . . . . . . . . . . . . . . . . . . . . . UNC 68 . . . 0.1640 32 36 . . . . . . . . . . . . . . . . . . . . . . . . UNC 810 . . . 0.1900 24 32 . . . . . . . . . . . . . . . . . . . . . . . . UNF 10
. . . 12 0.2160 24 28 32 . . . . . . . . . . . . . . . . . . UNF UNEF 12
1⁄4 . . . 0.2500 20 28 32 . . . . . . . . . . . . . . . UNC UNF UNEF 1⁄45⁄16 . . . 0.3125 18 24 32 . . . . . . . . . . . . . . . 20 28 UNEF 5⁄163⁄8 . . . 0.3750 16 24 32 . . . . . . . . . . . . UNC 20 28 UNEF 3⁄87⁄16 . . . 0.4375 14 20 28 . . . . . . . . . . . . 16 UNF UNEF 32 7⁄161⁄2 . . . 0.5000 13 20 28 . . . . . . . . . . . . 16 UNF UNEF 32 1⁄29⁄16 . . . 0.5625 12 I8 24 . . . . . . . . . UNC 16 20 28 32 9⁄165⁄8 . . . 0.6250 11 18 24 . . . . . . . . . 12 16 20 28 32 5⁄8
. . . 11⁄16 0.6875 . . . . . . 24 . . . . . . . . . 12 16 20 28 32 11⁄163⁄4 . . . 0.7500 10 16 20 . . . . . . . . . 12 UNF UNEF 28 32 3⁄4
. . . 13⁄16 0.8125 . . . . . . 20 . . . . . . . . . 12 16 UNEF 28 32 13⁄167⁄8 . . . 0.8750 9 14 20 . . . . . . . . . 12 16 UNEF 28 32 7⁄8
. . . 15⁄16 0.9375 . . . . . . 20 . . . . . . . . . 12 16 UNEF 28 32 15⁄16
1 . . . 1.0000 8 12 20 . . . . . . UNC UNF 16 UNEF 28 32 1. . . 11⁄16 1.0625 . . . . . . 18 . . . . . . 8 12 16 20 28 . . . 11⁄16
11⁄8 . . . 1.1250 7 12 18 . . . . . . 8 UNF 16 20 28 . . . 11⁄8. . . 13⁄16 1.1875 . . . . . . 18 . . . . . . 8 12 16 20 28 . . . 13⁄16
11⁄4 . . . 1.2500 7 12 18 . . . . . . 8 UNF 16 20 28 . . . 11⁄4. . . 15⁄16 1.3125 . . . . . . 18 . . . . . . 8 12 16 20 28 . . . 15⁄16
13⁄8 . . . 1.3750 6 12 18 . . . UNC 8 UNF 16 20 28 . . . 13⁄8. . . 17⁄16 1.4375 . . . . . . 18 . . . 6 8 12 16 20 28 . . . 17⁄16
11⁄2 . . . 1.5000 6 12 18 . . . UNC 8 UNF 16 20 28 . .. 11⁄2. . . 19⁄16 1.5625 . . . . . . 18 . . . 6 8 12 16 20 . . . . . . 19⁄16
15⁄8 . . . 1.6250 . . . . . . 18 . . . 6 8 12 16 20 . . . . . . 15⁄8. . . 111⁄16 1.6875 . . . . . . 18 . . . 6 8 12 16 20 . . . . . . 111⁄16
13⁄4 . . . 1.7500 5 . . . . . . . . . 6 8 12 16 20 . . . . . . 13⁄4. . . 113⁄16 1.8125 . . . . . . . . . . . . 6 8 12 16 20 . . . . . . 113⁄16
17⁄8 . . . 1.8750 . . . . . . . . . . . . 6 8 12 16 20 . . . . . . 17⁄8. . . 115⁄16 1.9375 . . . . . . . . . . . . 6 8 12 16 20 . . . . . . 115⁄16
2 . . . 2.0000 41⁄2 . . . . . . . . . 6 8 12 16 20 . . . . . . 2. . . 21⁄8 2.1250 . . . . . . . . . . . . 6 8 12 16 20 . . . . . . 21⁄8
21⁄4 . . . 2.2500 41⁄2 . . . . . . . . . 6 8 12 16 20 . . . . . . 21⁄4. . . 23⁄8 2.3750 . . . . . . . . . . . . 6 8 12 16 20 . . . . . . 23⁄8
21⁄2 . . . 2.5000 4 . . . . . . UNC 6 8 12 16 20 . . . . . . 21⁄2. . . 25⁄8 2.6250 . . . . . . . . . 4 6 8 12 16 20 . . . . . . 25⁄8
23⁄4 . . . 2.7500 4 . . . . . . UNC 6 8 12 16 20 . . . . . . 23⁄4. . . 27⁄8 2.8750 . . . . . . . . . 4 6 8 12 16 20 . . . . . . 27⁄8
6
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 1 Standard Series Threads (UN/UNR) (Cont’d)
Threads/in.
Series With GradedPitches
Basic ExtraNominal Size, in. Series With Constant PitchesMajor Course Fine Fine Nominal
Primary Secondary Diameter UNC UNF UNEF 4-UN 6-UN 8-UN 12-UN 16-UN 20-UN 28-UN 32-UN Size, in.
3 . . . 3.0000 4 . . . . . . UNC 6 8 12 16 20 . . . . . . 3. . . 31⁄8 3.1250 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 31⁄8
31⁄4 . . . 3.2500 4 . . . . . . UNC 6 8 12 16 . . . . . . . . . 31⁄4. . . 33⁄8 3.3750 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 33⁄8
31⁄2 . . . 3.5000 4 . . . . . . UNC 6 8 12 16 . . . . . . . . . 31⁄2. . . 35⁄8 3.6250 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 35⁄8
33⁄4 . . . 3.7500 4 . . . . . . UNC 6 8 12 16 . . . . . . . . . 33⁄4. . . 37⁄8 3.8750 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 37⁄8
4 . . . 4.0000 4 . . . . . . UNC 6 8 12 1.6 . . . . . . . . . 4. . . 41⁄8 4.1250 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 41⁄8
41⁄4 . . . 4.2500 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 41⁄4. . . 43⁄8 4.3750 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 43⁄8
41⁄2 . . . 4.5000 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 41⁄2. . . 45⁄8 4.6250 . . . . . . . . . 4 6 8 12 16 .. . . . . . . 45⁄8
43⁄4 . . . 4.7500 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 43⁄4. . . 47⁄8 4.8750 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 47⁄8
5 . . . 5.0000 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 5. . . 51⁄8 5.1250 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 51⁄8
51⁄4 . . . 5.2500 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 51⁄4. . . 53⁄8 5.3750 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 53⁄8
51⁄2 . . . 5.5000 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 51⁄2. . . 55⁄8 5.6250 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 55⁄8
53⁄4 . . . 5.7500 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 53⁄4. . . 57⁄8 5.8750 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 57⁄8
6 . . . 6.0000 . . . . . . . . . 4 6 8 12 16 . . . . . . . . . 6
GENERAL NOTE: Series designation shown indicates the UN thread form; however, the UNR thread form may be specifiedby substituting UNR in place of UN in all designations for external use only.
Table 1, offer a comprehensive range of diameter-pitchcombinations for those purposes where the threads inthe coarse-, fine-, and extra-fine-thread series do notmeet the particular requirements of the design. The pri-mary sizes of the 8-UN, 12-UN, and 16-UN series shownin Table 1 are the most commonly used.
Whenever a thread in a constant-pitch series alsoappears in the UNC, UNF, or UNEF series, the symbolsand tolerances for limits of size of those standard seriesare applicable.
3.6.1 8-Thread Series. The 8-thread series (8-UN) isa uniform-pitch series for large diameters or as a com-promise between coarse and fine thread series. Althoughoriginally intended for high-pressure-joint bolts andnuts, it is now widely used as a substitute for the coarsethread series for diameters larger than 1 in.
3.6.2 12-Thread Series. The 12-thread series (12-UN)is a uniform-pitch series for large diameters requiring
7
threads of medium-fine pitch. Although originallyintended for boiler practice, it is now used as a continua-tion of the fine thread series for diameters larger than11⁄2 in.
3.6.3 16-Thread Series. The 16-thread series (16-UN)is a uniform-pitch series for large diameters requiringfine-pitch threads. It is suitable for adjusting collars andretaining nuts and also serves as a continuation of theextra-fine thread series for diameters larger than 111⁄16 in.
3.7 Fine Threads for Thin-Wall Tubing
The limits of size for a 28-thread series, ranging from0.216 in. to 1.5 in. nominal size, are included in Table 2.These threads are recommended for general use on thin-wall tubing. The 27-thread series is no longer standardbut is included in Table D-1 of Nonmandatory Appen-dix D.
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
0–80
or0.
060–
80U
NF
2A0.
0005
0.05
950.
0563
...
0.05
140.
0496
0.00
1762
0.04
462B
0.04
650.
0514
0.05
190.
0542
0.00
230.
0600
3A0.
0000
0.06
000.
0568
...
0.05
190.
0506
0.00
1300
0.04
513B
0.04
650.
0514
0.05
190.
0536
0.00
170.
0600
(7)
1–64
or0.
073–
64U
NC
2A0.
0006
0.07
240.
0686
...
0.06
230.
0603
0.00
1970
0.05
382B
0.05
610.
0622
0.06
290.
0655
0.00
260.
0730
(7)
3A0.
0000
0.07
300.
0692
...
0.06
290.
0614
0.00
1500
0.05
443B
0.05
610.
0622
0.06
290.
0648
0.00
190.
0730
(7)
1–72
or0.
073–
72U
NF
2A0.
0006
0.07
240.
0689
...
0.06
340.
0615
0.00
1899
0.05
592B
0.05
80.
0634
0.06
400.
0665
0.00
250.
0730
(7)
3A0.
0000
0.07
300.
0695
...
0.06
400.
0626
0.00
1400
0.05
653B
0.05
800.
0634
0.06
400.
0659
0.00
190.
0730
2–56
or0.
086–
56U
NC
2A0.
0006
0.08
540.
0813
...
0.07
380.
0717
0.00
2127
0.06
412B
0.06
670.
0737
0.07
440.
0772
0.00
280.
0860
3A0.
0000
0.08
600.
0819
...
0.07
440.
0728
0.00
1600
0.06
473B
0.06
670.
0737
0.07
440.
0765
0.00
210.
0860
(7)
2–64
or0.
086–
64U
NF
2A0.
0006
0.08
540.
0816
...
0.07
530.
0733
0.00
2040
0.06
682B
0.06
910.
0752
0.07
590.
0786
0.00
270.
0860
(7)
3A0.
0000
0.08
600.
0822
...
0.07
590.
0744
0.00
1500
0.06
743B
0.06
910.
0752
0.07
590.
0779
0.00
200.
0860
3–48
or0.
099–
48U
NC
2A0.
0007
0.09
830.
0938
...
0.08
480.
0825
0.00
2302
0.07
352B
0.07
640.
0845
0.08
550.
0885
0.00
300.
0990
3A0.
0000
0.09
900.
0945
...
0.08
550.
0838
0.00
1700
0.07
423B
0.07
640.
0845
0.08
550.
0877
0.00
220.
0990
3–56
or0.
099–
56U
NF
2A0.
0007
0.09
830.
0942
...
0.08
670.
0845
0.00
2191
0.07
702B
0.07
970.
0865
0.08
740.
0902
0.00
280.
0990
3A0.
0000
0.09
900.
0949
...
0.08
740.
0858
0.00
1600
0.07
773B
0.07
970.
0865
0.08
740.
0895
0.00
210.
0990
4–40
or0.
112–
40U
NC
2A0.
0008
0.11
120.
1061
...
0.09
500.
0925
0.00
2507
0.08
142B
0.08
490.
0939
0.09
580.
0991
0.00
330.
1120
3A0.
0000
0.11
200.
1069
...
0.09
580.
0939
0.00
1900
0.08
223B
0.08
490.
0939
0.09
580.
0982
0.00
240.
1120
4–48
or0.
112–
48U
NF
2A0.
0007
0.11
130.
1068
...
0.09
780.
0954
0.00
2361
0.08
652B
0.08
940.
0968
0.09
850.
1016
0.00
310.
1120
3A0.
0000
0.11
200.
1075
...
0.09
850.
0967
0.00
1800
0.08
723B
0.08
940.
0968
0.09
850.
1008
0.00
230.
1120
5–40
or0.
125–
40U
NC
2A0.
0008
0.12
420.
1191
...
0.10
800.
1054
0.00
2562
0.09
442B
0.09
790.
1062
0.10
880.
1121
0.00
330.
1250
3A0.
0000
0.12
500.
1199
...
0.10
880.
1069
0.00
1900
0.09
523B
0.09
790.
1062
0.10
880.
1113
0.00
250.
1250
5–44
or0.
125–
44U
NF
2A0.
0007
0.12
430.
1195
...
0.10
950.
1070
0.00
2484
0.09
722B
0.10
040.
1079
0.11
020.
1134
0.00
320.
1250
3A0.
0000
0.12
500.
1202
...
0.11
020.
1083
0.00
1900
0.09
793B
0.10
040.
1079
0.11
020.
1126
0.00
240.
1250
6–32
or0.
138–
32U
NC
2A0.
0008
0.13
720.
1312
...
0.11
690.
1141
0.00
2820
0.10
002B
0.10
40.
114
0.11
770.
1214
0.00
370.
1380
(7)
3A0.
0000
0.13
800.
1320
...
0.11
770.
1156
0.00
2100
0.10
083B
0.10
400.
1139
0.11
770.
1204
0.00
270.
1380
6–40
or0.
138–
40U
NF
2A0.
0008
0.13
720.
1321
...
0.12
100.
1184
0.00
2614
0.10
742B
0.11
10.
119
0.12
180.
1252
0.00
340.
1380
3A0.
0000
0.13
800.
1329
...
0.12
180.
1198
0.00
2000
0.10
823B
0.11
100.
1186
0.12
180.
1243
0.00
250.
1380
8
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]M
inor
Func
tion
alD
iam
eter
Ser
ies
Max
.M
ajor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
8–
32or
0.16
4–
32U
NC
2A0.
0009
0.16
310.
1571
...
0.14
280.
1399
0.00
2916
0.12
592B
0.13
00.
139
0.14
370.
1475
0.00
380.
1640
(7)
3A0.
0000
0.16
400.
1580
...
0.14
370.
1415
0.00
2200
0.12
683B
0.13
000.
1388
0.14
370.
1465
0.00
280.
1640
8–
36or
0.16
4–
36U
NF
2A0.
0008
0.16
320.
1577
...
0.14
520.
1424
0.00
2804
0.13
012B
0.13
40.
142
0.14
600.
1496
0.00
360.
1640
3A0.
0000
0.16
400.
1585
...
0.14
600.
1439
0.00
2100
0.13
093B
0.13
400.
1416
0.14
600.
1487
0.00
270.
1640
(7)
10–
24or
0.19
0–
24U
NC
2A0.
0010
0.18
900.
1818
...
0.16
190.
1586
0.00
3319
0.13
942B
0.14
50.
155
0.16
290.
1672
0.00
430.
1900
3A0.
0000
0.19
000.
1828
...
0.16
290.
1604
0.00
2500
0.14
043B
0.14
500.
1555
0.16
290.
1661
0.00
320.
1900
10–
32or
0.19
0–
32U
NF
2A0.
0009
0.18
910.
1831
...
0.16
880.
1658
0.00
3004
0.15
192B
0.15
60.
164
0.16
970.
1736
0.00
390.
1900
3A0.
0000
0.19
000.
1840
...
0.16
970.
1674
0.00
2300
0.15
283B
0.15
600.
1641
0.16
970.
1726
0.00
290.
1900
12–
24or
0.21
6–
24U
NC
2A0.
0010
0.21
500.
2078
...
0.18
790.
1845
0.00
3400
0.16
542B
0.17
10.
181
0.18
890.
1933
0.00
440.
2160
3A0.
0000
0.21
600.
2088
...
0.18
890.
1863
0.00
2600
0.16
643B
0.17
100.
1807
0.18
890.
1922
0.00
330.
2160
12–
28or
0.21
6–
28U
NF
2A0.
0010
0.21
500.
2085
...
0.19
180.
1886
0.00
3224
0.17
252B
0.17
70.
186
0.19
280.
1970
0.00
420.
2160
3A0.
0000
0.21
600.
2095
...
0.19
280.
1904
0.00
2400
0.17
353B
0.17
700.
1857
0.19
280.
1959
0.00
310.
2160
(7)
12–
32or
0.21
6–
32U
NEF
2A0.
0010
0.21
500.
2090
...
0.19
470.
1915
0.00
3184
0.17
782B
0.18
20.
190
0.19
570.
1998
0.00
410.
2160
3A0.
0000
0.21
600.
2100
...
0.19
570.
1933
0.00
2400
0.17
883B
0.18
200.
1895
0.19
570.
1988
0.00
310.
2160
1 ⁄ 4–
20or
0.25
00–
20U
NC
1A0.
0011
0.24
890.
2367
...
0.21
640.
2108
0.00
5600
0.18
941B
0.19
60.
207
0.21
750.
2248
0.00
730.
2500
2A0.
0011
0.24
890.
2408
0.23
670.
2164
0.21
270.
0037
310.
1894
2B0.
196
0.20
70.
2175
0.22
240.
0049
0.25
003A
0.00
000.
2500
0.24
19..
.0.
2175
0.21
470.
0028
000.
1905
3B0.
1960
0.20
670.
2175
0.22
110.
0036
0.25
00
1 ⁄ 4–
28or
0.25
00–
28U
NF
1A0.
0010
0.24
900.
2392
...
0.22
580.
2208
0.00
5000
0.20
651B
0.21
10.
220.
2268
0.23
330.
0065
0.25
002A
0.00
100.
2490
0.24
25..
.0.
2258
0.22
250.
0033
220.
2065
2B0.
211
0.22
00.
2268
0.23
110.
0043
0.25
003A
0.00
000.
2500
0.24
35..
.0.
2268
0.22
430.
0025
000.
2075
3B0.
2110
0.21
900.
2268
0.23
000.
0032
0.25
00
1 ⁄ 4–
32or
0.25
00–
32U
NEF
2A0.
0010
0.24
900.
2430
...
0.22
870.
2255
0.00
3229
0.21
182B
0.21
60.
224
0.22
970.
2339
0.00
420.
2500
3A0.
0000
0.25
000.
2440
...
0.22
970.
2273
0.00
2400
0.21
283B
0.21
600.
2229
0.22
970.
2328
0.00
310.
2500
5 ⁄ 16
–18
or0.
3125
–18
UN
C1A
0.00
120.
3113
0.29
82..
.0.
2752
0.26
910.
0061
000.
2451
1B0.
252
0.26
50.
2764
0.28
430.
0079
0.31
252A
0.00
120.
3113
0.30
260.
2982
0.27
520.
2712
0.00
4041
0.24
512B
0.25
20.
265
0.27
640.
2817
0.00
530.
3125
3A0.
0000
0.31
250.
3038
...
0.27
640.
2734
0.00
3000
0.24
633B
0.25
200.
2630
0.27
640.
2803
0.00
390.
3125
(7)
5 ⁄ 16
–20
or0.
3125
–20
UN
2A0.
0012
0.31
130.
3032
...
0.27
880.
2747
0.00
4060
0.25
182B
0.25
80.
270
0.28
000.
2853
0.00
530.
3125
(7)
3A0.
0000
0.31
250.
3044
...
0.28
000.
2770
0.00
3000
0.25
303B
0.25
800.
2680
0.28
000.
2840
0.00
400.
3125
9
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]M
inor
Func
tion
alD
iam
eter
Ser
ies
Max
.M
ajor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
5 ⁄ 16
–24
or0.
3125
–24
UN
F1A
0.00
110.
3114
0.30
06..
.0.
2843
0.27
880.
0055
000.
2618
1B0.
267
0.27
70.
2854
0.29
250.
0071
0.31
252A
0.00
110.
3114
0.30
42..
.0.
2843
0.28
060.
0036
600.
2618
2B0.
267
0.27
70.
2854
0.29
020.
0048
0.31
253A
0.00
000.
3125
0.30
53..
.0.
2854
0.28
270.
0027
000.
2629
3B0.
2670
0.27
540.
2854
0.28
900.
0036
0.31
25
(7)
5 ⁄ 16
–28
or0.
3125
–28
UN
2A0.
0010
0.31
150.
3050
...
0.28
830.
2848
0.00
3495
0.26
902B
0.27
40.
282
0.28
930.
2938
0.00
450.
3125
(7)
3A0.
0000
0.31
250.
3060
...
0.28
930.
2867
0.00
2600
0.27
003B
0.27
400.
2807
0.28
930.
2927
0.00
340.
3125
(7)
5 ⁄ 16
–32
or0.
3125
–32
UN
EF2A
0.00
100.
3115
0.30
55..
.0.
2912
0.28
790.
0033
020.
2743
2B0.
279
0.28
60.
2922
0.29
650.
0043
0.31
25(7
)3A
0.00
000.
3125
0.30
65..
.0.
2922
0.28
970.
0025
000.
2753
3B0.
2790
0.28
460.
2922
0.29
540.
0032
0.31
25
3 ⁄ 8–
16or
0.37
50–
16U
NC
1A0.
0013
0.37
370.
3595
...
0.33
310.
3266
0.00
6500
0.29
931B
0.30
70.
321
0.33
440.
3429
0.00
850.
3750
2A0.
0013
0.37
370.
3643
0.35
950.
3331
0.32
870.
0043
630.
2993
2B0.
307
0.32
10.
3344
0.34
010.
0057
0.37
503A
0.00
000.
3750
0.36
56..
.0.
3344
0.33
110.
0033
000.
3006
3B0.
3070
0.31
820.
3344
0.33
870.
0043
0.37
50
3 ⁄ 8–
20or
0.37
50–
20U
N2A
0.00
120.
3738
0.36
57..
.0.
3413
0.33
720.
0041
240.
3143
2B0.
321
0.33
20.
3425
0.34
790.
0054
0.37
503A
0.00
000.
3750
0.36
69..
.0.
3425
0.33
940.
0031
000.
3155
3B0.
3210
0.32
970.
3425
0.34
650.
0040
0.37
50
3 ⁄ 8–
24or
0.37
50–
24U
NF
1A0.
0011
0.37
390.
3631
...
0.34
680.
3411
0.00
5700
0.32
431B
0.33
0.34
0.34
790.
3553
0.00
740.
3750
2A0.
0011
0.37
390.
3667
...
0.34
680.
3430
0.00
3804
0.32
432B
0.33
00.
340
0.34
790.
3528
0.00
490.
3750
3A0.
0000
0.37
500.
3678
...
0.34
790.
3450
0.00
2900
0.32
543B
0.33
000.
3372
0.34
790.
3516
0.00
370.
3750
3 ⁄ 8–
28or
0.37
50–
28U
N2A
0.00
110.
3739
0.36
74..
.0.
3507
0.34
710.
0035
590.
3314
2B0.
336
0.34
50.
3518
0.35
640.
0046
0.37
503A
0.00
000.
3750
0.36
85..
.0.
3518
0.34
910.
0027
000.
3325
3B0.
3360
0.34
260.
3518
0.35
530.
0035
0.37
50
3 ⁄ 8–
32or
0.37
50–
32U
NEF
2A0.
0010
0.37
400.
3680
...
0.35
370.
3503
0.00
3366
0.33
682B
0.34
10.
349
0.35
470.
3591
0.00
440.
3750
3A0.
0000
0.37
500.
3690
...
0.35
470.
3522
0.00
2500
0.33
783B
0.34
100.
3469
0.35
470.
3580
0.00
330.
3750
7 ⁄ 16
–14
or0.
4375
–14
UN
C1A
0.00
140.
4361
0.42
06..
.0.
3897
0.38
260.
0071
000.
3510
1B0.
360.
376
0.39
110.
4003
0.00
920.
4375
2A0.
0014
0.43
610.
4258
0.42
060.
3897
0.38
500.
0047
130.
3510
2B0.
360
0.37
60.
3911
0.39
720.
0061
0.43
753A
0.00
000.
4375
0.42
72..
.0.
3911
0.38
760.
0035
000.
3524
3B0.
3600
0.37
170.
3911
0.39
570.
0046
0.43
75
(7)
7 ⁄ 16
–16
or0.
4375
–16
UN
2A0.
0014
0.43
610.
4267
...
0.39
550.
3909
0.00
4626
0.36
172B
0.37
00.
384
0.39
690.
4029
0.00
600.
4375
(7)
3A0.
0000
0.43
750.
4281
...
0.39
690.
3934
0.00
3500
0.36
313B
0.37
000.
3800
0.39
690.
4014
0.00
450.
4375
(7)
7 ⁄ 16
–20
or0.
4375
–20
UN
F1A
0.00
130.
4362
0.42
40..
.0.
4037
0.39
740.
0063
000.
3767
1B0.
383
0.39
50.
4050
0.41
310.
0081
0.43
752A
0.00
130.
4362
0.42
81..
.0.
4037
0.39
950.
0041
670.
3767
2B0.
383
0.39
50.
4050
0.41
040.
0054
0.43
753A
0.00
000.
4375
0.42
94..
.0.
4050
0.40
190.
0031
000.
3780
3B0.
3830
0.39
160.
4050
0.40
910.
0041
0.43
75
10
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UN
RM
inor
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
Func
tion
alD
iam
eter
[Not
e(4
)]M
inor
Func
tion
alD
iam
eter
Ser
ies
Max
.M
ajor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
(7)
7 ⁄ 16
–28
or0.
4375
–28
UN
EF2A
0.00
110.
4364
0.42
99..
.0.
4132
0.40
960.
0036
160.
3939
2B0.
399
0.40
70.
4143
0.41
900.
0047
0.43
753A
0.00
000.
4375
0.43
10..
.0.
4143
0.41
160.
0027
000.
3950
3B0.
3990
0.40
510.
4143
0.41
780.
0035
0.43
75
(7)
7 ⁄ 16
–32
or0.
4375
–32
UN
2A0.
0010
0.43
650.
4305
...
0.41
620.
4128
0.00
3423
0.39
932B
0.40
40.
411
0.41
720.
4216
0.00
440.
4375
3A0.
0000
0.43
750.
4315
...
0.41
720.
4146
0.00
2600
0.40
033B
0.40
400.
4094
0.41
720.
4205
0.00
330.
4375
1 ⁄ 2–
13or
0.50
00–
13U
NC
1A0.
0015
0.49
850.
4822
...
0.44
850.
4411
0.00
7400
0.40
691B
0.41
70.
434
0.45
000.
4597
0.00
970.
5000
2A0.
0015
0.49
850.
4876
0.48
220.
4485
0.44
350.
0049
650.
4069
2B0.
417
0.43
40.
4500
0.45
650.
0065
0.50
003A
0.00
000.
5000
0.48
91..
.0.
4500
0.44
630.
0037
000.
4084
3B0.
4170
0.42
840.
4500
0.45
480.
0048
0.50
00
1 ⁄ 2–
16or
0.50
00–
16U
N2A
0.00
140.
4986
0.48
92..
.0.
4580
0.45
330.
0046
780.
4242
2B0.
432
0.44
60.
4594
0.46
550.
0061
0.50
00(7
)3A
0.00
000.
5000
0.49
06..
.0.
4594
0.45
590.
0035
000.
4256
3B0.
4320
0.44
200.
4594
0.46
400.
0046
0.50
00
1 ⁄ 2–
20or
0.50
00–
20U
NF
1A0.
0013
0.49
870.
4865
...
0.46
620.
4598
0.00
6400
0.43
921B
0.44
60.
457
0.46
750.
4759
0.00
840.
5000
2A0.
0013
0.49
870.
4906
...
0.46
620.
4619
0.00
4288
0.43
922B
0.44
60.
457
0.46
750.
4731
0.00
560.
5000
3A0.
0000
0.50
000.
4919
...
0.46
750.
4643
0.00
3200
0.44
053B
0.44
600.
4537
0.46
750.
4717
0.00
420.
5000
1 ⁄ 2–
28or
0.50
00–
28U
NEF
2A0.
0011
0.49
890.
4924
...
0.47
570.
4720
0.00
3668
0.45
642B
0.46
10.
470
0.47
680.
4816
0.00
480.
5000
3A0.
0000
0.50
000.
4935
...
0.47
680.
4740
0.00
2800
0.45
753B
0.46
100.
4676
0.47
680.
4804
0.00
360.
5000
1 ⁄ 2–
32or
0.50
00–
32U
N2A
0.00
100.
4990
0.49
30..
.0.
4787
0.47
520.
0034
750.
4618
2B0.
466
0.47
40.
4797
0.48
420.
0045
0.50
003A
0.00
000.
5000
0.49
40..
.0.
4797
0.47
710.
0026
000.
4628
3B0.
4660
0.47
190.
4797
0.48
310.
0034
0.50
00
9 ⁄ 16
–12
or0.
5625
–12
UN
C1A
0.00
160.
5609
0.54
37..
.0.
5068
0.49
900.
0078
000.
4617
1B0.
472
0.49
0.50
840.
5186
0.01
020.
5625
2A0.
0016
0.56
090.
5495
0.54
370.
5068
0.50
160.
0052
250.
4617
2B0.
472
0.49
00.
5084
0.51
520.
0068
0.56
253A
0.00
000.
5625
0.55
11..
.0.
5084
0.50
450.
0039
000.
4633
3B0.
4720
0.48
430.
5084
0.51
350.
0051
0.56
25
9 ⁄ 16
–16
or0.
5625
–16
UN
2A0.
0014
0.56
110.
5517
...
0.52
050.
5158
0.00
4725
0.48
672B
0.49
50.
509
0.52
190.
5280
0.00
610.
5625
(7)
3A0.
0000
0.56
250.
5531
...
0.52
190.
5184
0.00
3500
0.48
813B
0.49
500.
5041
0.52
190.
5265
0.00
460.
5625
9 ⁄ 16
–18
or0.
5625
–18
UN
F1A
0.00
140.
5611
0.54
80..
.0.
5250
0.51
820.
0068
000.
4949
1B0.
502
0.51
50.
5264
0.53
530.
0089
0.56
252A
0.00
140.
5611
0.55
24..
.0.
5250
0.52
050.
0045
470.
4949
2B0.
502
0.51
50.
5264
0.53
230.
0059
0.56
253A
0.00
000.
5625
0.55
38..
.0.
5264
0.52
300.
0034
000.
4963
3B0.
5020
0.51
060.
5264
0.53
080.
0044
0.56
25
(7)
9 ⁄ 16
–20
or0.
5625
–20
UN
2A0.
0013
0.56
120.
5531
...
0.52
870.
5244
0.00
4280
0.50
172B
0.50
80.
520
0.53
000.
5356
0.00
560.
5625
(7)
3A0.
0000
0.56
250.
5544
...
0.53
000.
5268
0.00
3200
0.50
303B
0.50
800.
5161
0.53
000.
5342
0.00
420.
5625
(7)
9 ⁄ 16
–24
or0.
5625
–24
UN
EF2A
0.00
120.
5613
0.55
41..
.0.
5342
0.53
020.
0039
600.
5117
2B0.
517
0.52
70.
5354
0.54
050.
0051
0.56
25(7
)3A
0.00
000.
5625
0.55
53..
.0.
5354
0.53
240.
0030
000.
5129
3B0.
5170
0.52
440.
5354
0.53
930.
0039
0.56
25
11
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]M
inor
Func
tion
alD
iam
eter
Ser
ies
Max
.M
ajor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
9 ⁄ 16
–28
or0.
5625
–28
UN
2A0.
0011
0.56
140.
5549
...
0.53
820.
5345
0.00
3715
0.51
892B
0.52
40.
532
0.53
930.
5441
0.00
480.
5625
3A0.
0000
0.56
250.
5560
...
0.53
930.
5365
0.00
2800
0.52
003B
0.52
400.
5301
0.53
930.
5429
0.00
360.
5625
(7)
9 ⁄ 16
–32
or0.
5625
–32
UN
2A0.
0011
0.56
140.
5554
...
0.54
110.
5376
0.00
3522
0.52
422B
0.52
90.
536
0.54
220.
5468
0.00
460.
5625
3A0.
0000
0.56
250.
5565
...
0.54
220.
5396
0.00
2600
0.52
533B
0.52
900.
5344
0.54
220.
5456
0.00
340.
5625
(7)
5 ⁄ 8–
11or
0.62
50–
11U
NC
1A0.
0017
0.62
330.
6051
...
0.56
430.
5560
0.00
8300
0.51
501B
0.52
70.
546
0.56
600.
5767
0.01
070.
6250
(7)
2A0.
0017
0.62
330.
6112
0.60
520.
5643
0.55
880.
0055
010.
5150
2B0.
527
0.54
60.
5660
0.57
320.
0072
0.62
503A
0.00
000.
6250
0.61
29..
.0.
5660
0.56
190.
0041
000.
5167
3B0.
5270
0.53
910.
5660
0.57
140.
0054
0.62
50
5 ⁄ 8–
12or
0.62
50–
12U
N2A
0.00
160.
6234
0.61
20..
.0.
5693
0.56
390.
0054
430.
5242
2B0.
535
0.55
30.
5709
0.57
800.
0071
0.62
503A
0.00
000.
6250
0.61
36..
.0.
5709
0.56
680.
0041
000.
5258
3B0.
5350
0.54
630.
5709
0.57
620.
0053
0.62
50
5 ⁄ 8–
16or
0.62
50–
16U
N2A
0.00
140.
6236
0.61
42..
.0.
5830
0.57
820.
0047
690.
5492
2B0.
557
0.57
10.
5844
0.59
060.
0062
0.62
503A
0.00
000.
6250
0.61
56..
.0.
5844
0.58
080.
0036
000.
5506
3B0.
5570
0.56
620.
5844
0.58
900.
0046
0.62
50
5 ⁄ 8–
18or
0.62
50–
18U
NF
1A0.
0014
0.62
360.
6105
...
0.58
750.
5805
0.00
7000
0.55
741B
0.56
50.
578
0.58
890.
5980
0.00
910.
6250
2A0.
0014
0.62
360.
6149
...
0.58
750.
5828
0.00
4652
0.55
742B
0.56
50.
578
0.58
890.
5949
0.00
600.
6250
3A0.
0000
0.62
500.
6163
...
0.58
890.
5854
0.00
3500
0.55
883B
0.56
500.
5730
0.58
890.
5934
0.00
450.
6250
5 ⁄ 8–
20or
0.62
50–
20U
N2A
0.00
130.
6237
0.61
56..
.0.
5912
0.58
690.
0043
240.
5642
2B0.
571
0.58
20.
5925
0.59
810.
0056
0.62
503A
0.00
000.
6250
0.61
69..
.0.
5925
0.58
930.
0032
000.
5655
3B0.
5710
0.57
860.
5925
0.59
670.
0042
0.62
50
5 ⁄ 8–
24or
0.62
50–
24U
NEF
2A0.
0012
0.62
380.
6166
...
0.59
670.
5927
0.00
4004
0.57
422B
0.58
00.
590
0.59
790.
6031
0.00
520.
6250
3A0.
0000
0.62
500.
6178
...
0.59
790.
5949
0.00
3000
0.57
543B
0.58
000.
5869
0.59
790.
6018
0.00
390.
6250
5 ⁄ 8–
28or
0.62
50–
28U
N2A
0.00
110.
6239
0.61
74..
.0.
6007
0.59
690.
0037
590.
5814
2B0.
586
0.59
50.
6018
0.60
670.
0049
0.62
503A
0.00
000.
6250
0.61
85..
.0.
6018
0.59
900.
0028
000.
5825
3B0.
5860
0.59
260.
6018
0.60
550.
0037
0.62
50
(7)
5 ⁄ 8–
32or
0.62
50–
32U
N2A
0.00
110.
6239
0.61
79..
.0.
6036
0.60
000.
0035
660.
5867
2B0.
591
0.59
90.
6047
0.60
930.
0046
0.62
503A
0.00
000.
6250
0.61
90..
.0.
6047
0.60
200.
0027
000.
5878
3B0.
5910
0.59
690.
6047
0.60
820.
0035
0.62
50
(7)
11⁄ 1
6–12
or0.
6875
–12
UN
2A0.
0016
0.68
590.
6745
...
0.63
180.
6263
0.00
5485
0.58
672B
0.59
70.
615
0.63
340.
6405
0.00
710.
6875
3A0.
0000
0.68
750.
6761
...
0.63
340.
6293
0.00
4100
0.58
833B
0.59
700.
6085
0.63
340.
6387
0.00
530.
6875
(7)
11⁄ 1
6–16
or0.
6875
–16
UN
2A0.
0014
0.68
610.
6767
...
0.64
550.
6407
0.00
4811
0.61
172B
0.62
00.
634
0.64
690.
6532
0.00
630.
6875
3A0.
0000
0.68
750.
6781
...
0.64
690.
6433
0.00
3600
0.61
313B
0.62
000.
6284
0.64
690.
6516
0.00
470.
6875
12
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]M
inor
Func
tion
alD
iam
eter
Ser
ies
Max
.M
ajor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
(7)
11⁄ 1
6–20
or0.
6875
–20
UN
2A0.
0013
0.68
620.
6781
...
0.65
370.
6493
0.00
4366
0.62
672B
0.63
30.
645
0.65
500.
6607
0.00
570.
6875
(7)
3A0.
0000
0.68
750.
6794
...
0.65
500.
6517
0.00
3300
0.62
803B
0.63
300.
6411
0.65
500.
6593
0.00
430.
6875
(7)
11⁄ 1
6–24
or0.
6875
–24
UN
EF2A
0.00
120.
6863
0.67
91..
.0.
6592
0.65
520.
0040
460.
6367
2B0.
642
0.65
20.
6604
0.66
570.
0053
0.68
753A
0.00
000.
6875
0.68
03..
.0.
6604
0.65
740.
0030
000.
6379
3B0.
6420
0.64
940.
6604
0.66
430.
0039
0.68
75
11⁄ 1
6–28
or0.
6875
–28
UN
2A0.
0011
0.68
640.
6799
...
0.66
320.
6594
0.00
3801
0.64
392B
0.64
90.
657
0.66
430.
6692
0.00
490.
6875
(7)
3A0.
0000
0.68
750.
6810
...
0.66
430.
6614
0.00
2900
0.64
503B
0.64
900.
6551
0.66
430.
6680
0.00
370.
6875
(7)
11⁄ 1
6–32
or0.
6875
–32
UN
2A0.
0011
0.68
640.
6804
...
0.66
610.
6625
0.00
3608
0.64
922B
0.65
40.
661
0.66
720.
6719
0.00
470.
6875
3A0.
0000
0.68
750.
6815
...
0.66
720.
6645
0.00
2700
0.65
033B
0.65
400.
6594
0.66
720.
6707
0.00
350.
6875
3 ⁄ 4–
10or
0.75
00–
10U
NC
1A0.
0018
0.74
820.
7288
...
0.68
320.
6744
0.00
8800
0.62
911B
0.64
20.
663
0.68
500.
6965
0.01
150.
7500
2A0.
0018
0.74
820.
7353
0.72
880.
6832
0.67
730.
0058
940.
6291
2B0.
642
0.66
30.
6850
0.69
270.
0077
0.75
003A
0.00
000.
7500
0.73
71..
.0.
6850
0.68
060.
0044
000.
6309
3B0.
6420
0.65
450.
6850
0.69
070.
0057
0.75
00
3 ⁄ 4–
12or
0.75
00–
12U
N2A
0.00
170.
7483
0.73
69..
.0.
6942
0.68
870.
0055
240.
6491
2B0.
660
0.67
80.
6959
0.70
310.
0072
0.75
003A
0.00
000.
7500
0.73
86..
.0.
6959
0.69
180.
0041
000.
6508
3B0.
6600
0.67
070.
6959
0.70
130.
0054
0.75
00
3 ⁄ 4–
16or
0.75
00–
16U
NF
1A0.
0015
0.74
850.
7343
...
0.70
790.
7004
0.00
7500
0.67
411B
0.68
20.
696
0.70
940.
7192
0.00
980.
7500
2A0.
0015
0.74
850.
7391
...
0.70
790.
7029
0.00
5024
0.67
412B
0.68
20.
696
0.70
940.
7159
0.00
650.
7500
(7)
3A0.
0000
0.75
000.
7406
...
0.70
940.
7056
0.00
3800
0.67
563B
0.68
200.
6909
0.70
940.
7143
0.00
490.
7500
3 ⁄ 4–
20or
0.75
00–
20U
NEF
2A0.
0013
0.74
870.
7406
...
0.71
620.
7118
0.00
4405
0.68
922B
0.69
60.
707
0.71
750.
7232
0.00
570.
7500
(7)
3A0.
0000
0.75
000.
7419
...
0.71
750.
7142
0.00
3300
0.69
053B
0.69
600.
7036
0.71
750.
7218
0.00
430.
7500
3 ⁄ 4–
28or
0.75
00–
28U
N2A
0.00
120.
7488
0.74
23..
.0.
7256
0.72
180.
0038
400.
7063
2B0.
711
0.72
00.
7268
0.73
180.
0050
0.75
00(7
)3A
0.00
000.
7500
0.74
35..
.0.
7268
0.72
390.
0029
000.
7075
3B0.
7110
0.71
760.
7268
0.73
050.
0037
0.75
00
3 ⁄ 4–
32or
0.75
00–
32U
N2A
0.00
110.
7489
0.74
29..
.0.
7286
0.72
500.
0036
470.
7117
2B0.
716
0.72
40.
7297
0.73
440.
0047
0.75
003A
0.00
000.
7500
0.74
40..
.0.
7297
0.72
700.
0027
000.
7128
3B0.
7160
0.72
190.
7297
0.73
330.
0036
0.75
00
(7)
13⁄ 1
6–12
or0.
8125
–12
UN
2A0.
0017
0.81
080.
7994
...
0.75
670.
7511
0.00
5561
0.71
162B
0.72
20.
740
0.75
840.
7656
0.00
720.
8125
(7)
3A0.
0000
0.81
250.
8011
...
0.75
840.
7542
0.00
4200
0.71
333B
0.72
200.
7329
0.75
840.
7638
0.00
540.
8125
(7)
13⁄ 1
6–16
or0.
8125
–16
UN
2A0.
0015
0.81
100.
8016
...
0.77
040.
7655
0.00
4887
0.73
662B
0.74
50.
759
0.77
190.
7783
0.00
640.
8125
(7)
3A0.
0000
0.81
250.
8031
...
0.77
190.
7682
0.00
3700
0.73
813B
0.74
500.
7534
0.77
190.
7767
0.00
480.
8125
13
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
(7)
13⁄ 1
6–20
or0.
8125
–20
UN
EF2A
0.00
130.
8112
0.80
31..
.0.
7787
0.77
430.
0044
420.
7517
2B0.
758
0.77
00.
7800
0.78
580.
0058
0.81
25(7
)3A
0.00
000.
8125
0.80
44..
.0.
7800
0.77
670.
0033
000.
7530
3B0.
7580
0.76
610.
7800
0.78
430.
0043
0.81
25
(7)
13⁄ 1
6–28
or0.
8125
–28
UN
2A0.
0012
0.81
130.
8048
...
0.78
810.
7842
0.00
3877
0.76
882B
0.77
40.
782
0.78
930.
7943
0.00
500.
8125
(7)
3A0.
0000
0.81
250.
8060
...
0.78
930.
7864
0.00
2900
0.77
003B
0.77
400.
7801
0.78
930.
7931
0.00
380.
8125
(7)
13⁄ 1
6–32
or0.
8125
–32
UN
2A0.
0011
0.81
140.
8054
...
0.79
110.
7874
0.00
3684
0.77
422B
0.77
90.
786
0.79
220.
7970
0.00
480.
8125
(7)
3A0.
0000
0.81
250.
8065
...
0.79
220.
7894
0.00
2800
0.77
533B
0.77
900.
7844
0.79
220.
7958
0.00
360.
8125
7 ⁄ 8–
9or
0.87
50–
9U
NC
1A0.
0019
0.87
310.
8523
...
0.80
090.
7914
0.00
9500
0.74
081B
0.75
50.
778
0.80
280.
8151
0.01
230.
8750
2A0.
0019
0.87
310.
8592
0.85
230.
8009
0.79
460.
0063
050.
7408
2B0.
755
0.77
80.
8028
0.81
100.
0082
0.87
503A
0.00
000.
8750
0.86
11..
.0.
8028
0.79
810.
0047
000.
7427
3B0.
7550
0.76
810.
8028
0.80
890.
0061
0.87
50
(7)
7 ⁄ 8–
12or
0.87
50–
12U
N2A
0.00
170.
8733
0.86
19..
.0.
8192
0.81
360.
0055
960.
7741
2B0.
785
0.80
30.
8209
0.82
820.
0073
0.87
50(7
)3A
0.00
000.
8750
0.86
36..
.0.
8209
0.81
670.
0042
000.
7758
3B0.
7850
0.79
520.
8209
0.82
640.
0055
0.87
50
(7)
7 ⁄ 8–
14or
0.87
50–
14U
NF
1A0.
0016
0.87
340.
8579
...
0.82
700.
8189
0.00
8100
0.78
831B
0.79
80.
813
0.82
860.
8392
0.01
060.
8750
(7)
2A0.
0016
0.87
340.
8631
...
0.82
700.
8216
0.00
5420
0.78
832B
0.79
80.
813
0.82
860.
8356
0.00
700.
8750
(7)
3A0.
0000
0.87
500.
8647
...
0.82
860.
8245
0.00
4100
0.78
993B
0.79
800.
8067
0.82
860.
8339
0.00
530.
8750
(7)
7 ⁄ 8–
16or
0.87
50–
16U
N2A
0.00
150.
8735
0.86
41..
.0.
8329
0.82
800.
0049
220.
7991
2B0.
807
0.82
10.
8344
0.84
080.
0064
0.87
50(7
)3A
0.00
000.
8750
0.86
56..
.0.
8344
0.83
070.
0037
000.
8006
3B0.
8070
0.81
590.
8344
0.83
920.
0048
0.87
50
(7)
7 ⁄ 8–
20or
0.87
50–
20U
NEF
2A0.
0013
0.87
370.
8656
...
0.84
120.
8367
0.00
4477
0.81
422B
0.82
10.
832
0.84
250.
8483
0.00
580.
8750
(7)
3A7
0.00
000.
8750
0.86
69..
.0.
8425
0.83
910.
0034
000.
8155
3B0.
8210
0.82
860.
8425
0.84
690.
0044
0.87
50
(7)
7 ⁄ 8–
28or
0.87
50–
28U
N2A
0.00
120.
8738
0.86
73..
.0.
8506
0.84
670.
0039
120.
8313
2B0.
836
0.84
50.
8518
0.85
690.
0051
0.87
50(7
)3A
70.
0000
0.87
500.
8685
...
0.85
180.
8489
0.00
2900
0.83
253B
0.83
600.
8426
0.85
180.
8556
0.00
380.
8750
(7)
7 ⁄ 8–
32or
0.87
50–
32U
N2A
0.00
110.
8739
0.86
79..
.0.
8536
0.84
990.
0037
190.
8367
2B0.
841
0.84
90.
8547
0.85
950.
0048
0.87
50(7
)3A
0.00
000.
8750
0.86
90..
.0.
8547
0.85
190.
0028
000.
8378
3B0.
8410
0.84
690.
8547
0.85
830.
0036
0.87
50
(7)
15⁄ 1
6–12
or0.
9375
–12
UN
2A0.
0017
0.93
580.
9244
...
0.88
170.
8761
0.00
5629
0.83
662B
0.84
70.
865
0.88
340.
8907
0.00
730.
9375
(7)
3A7
0.00
000.
9375
0.92
61..
.0.
8834
0.87
920.
0042
000.
8383
3B0.
8470
0.85
750.
8834
0.88
890.
0055
0.93
75
(7)
15⁄ 1
6–16
or0.
9375
–16
UN
2A0.
0015
0.93
600.
9266
...
0.89
540.
8904
0.00
4955
0.86
162B
0.87
00.
884
0.89
690.
9033
0.00
640.
9375
(7)
3A0.
0000
0.93
750.
9281
...
0.89
690.
8932
0.00
3700
0.86
313B
0.87
000.
8784
0.89
690.
9017
0.00
480.
9375
14
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
15⁄ 1
6–
20or
0.93
75–
20U
NEF
2A0.
0014
0.93
610.
9280
...
0.90
360.
8991
0.00
4510
0.87
662B
0.88
30.
895
0.90
500.
9109
0.00
590.
9375
(7)
3A0.
0000
0.93
750.
9294
...
0.90
500.
9016
0.00
3400
0.87
803B
0.88
300.
8911
0.90
500.
9094
0.00
440.
9375
(7)
15⁄ 1
6–28
or0.
9375
–28
UN
2A0.
0012
0.93
630.
9298
...
0.91
310.
9092
0.00
3945
0.89
382B
0.89
90.
907
0.91
430.
9194
0.00
510.
9375
(7)
3A0.
0000
0.93
750.
9310
...
0.91
430.
9113
0.00
3000
0.89
503B
0.89
900.
9051
0.91
430.
9181
0.00
380.
9375
15⁄ 1
6–
32or
0.93
75–
32U
N2A
0.00
110.
9364
0.93
04..
.0.
9161
0.91
230.
0037
520.
8992
2B0.
904
0.91
10.
9172
0.92
210.
0049
0.93
753A
0.00
000.
9375
0.93
15..
.0.
9172
0.91
440.
0028
000.
9003
3B0.
9040
0.90
940.
9172
0.92
090.
0037
0.93
75
(7)
1–
8or
1.00
00–
8U
NC
1A0.
0020
0.99
800.
9755
...
0.91
680.
9067
0.01
0100
0.84
921B
0.86
50.
890.
9188
0.93
200.
0132
1.00
002A
0.00
200.
9980
0.98
300.
9755
0.91
680.
9101
0.00
6750
0.84
922B
0.86
50.
890
0.91
880.
9276
0.00
881.
0000
3A0.
0000
1.00
000.
9850
...
0.91
880.
9137
0.00
5100
0.85
123B
0.86
500.
8797
0.91
880.
9254
0.00
661.
0000
1–
12or
1.00
00–
12U
NF
1A0.
0018
0.99
820.
9810
...
0.94
410.
9353
0.00
8800
0.89
901B
0.91
0.92
80.
9459
0.95
730.
0114
1.00
002A
0.00
180.
9982
0.98
68..
.0.
9441
0.93
820.
0058
620.
8990
2B0.
910
0.92
80.
9459
0.95
350.
0076
1.00
003A
0.00
001.
0000
0.98
86..
.0.
9459
0.94
150.
0044
000.
9008
3B0.
9100
0.91
980.
9459
0.95
160.
0057
1.00
00
(7)
1–
14or
1.00
00–
14U
NS
(8)
2A0.
0016
0.99
840.
9881
...
0.95
200.
9467
0.00
5285
0.91
332B
0.92
30.
938
0.95
360.
9605
0.00
691.
0000
(7)
3A0.
0000
1.00
000.
9897
...
0.95
360.
9496
0.00
4000
0.91
493B
0.92
300.
9315
0.95
360.
9588
0.00
521.
0000
1–
16or
1.00
00–
16U
N2A
0.00
150.
9985
0.98
91..
.0.
9579
0.95
290.
0049
870.
9241
2B0.
932
0.94
60.
9594
0.96
590.
0065
1.00
003A
0.00
001.
0000
0.99
06..
.0.
9594
0.95
570.
0037
000.
9256
3B0.
9320
0.94
090.
9594
0.96
430.
0049
1.00
00
1–
20or
1.00
00–
20U
NEF
2A0.
0014
0.99
860.
9905
...
0.96
610.
9616
0.00
4542
0.93
912B
0.94
60.
957
0.96
750.
9734
0.00
591.
0000
3A0.
0000
1.00
000.
9919
...
0.96
750.
9641
0.00
3400
0.94
053B
0.94
600.
9536
0.96
750.
9719
0.00
441.
0000
1–
28or
1.00
00–
28U
N2A
0.00
120.
9988
0.99
23..
.0.
9756
0.97
160.
0039
770.
9563
2B0.
961
0.97
00.
9768
0.98
200.
0052
1.00
003A
0.00
001.
0000
0.99
35..
.0.
9768
0.97
380.
0030
000.
9575
3B0.
9610
0.96
760.
9768
0.98
070.
0039
1.00
00
1–
32or
1.00
00–
32U
N2A
0.00
110.
9989
0.99
29..
.0.
9786
0.97
480.
0037
840.
9617
2B0.
966
0.97
40.
9797
0.98
460.
0049
1.00
003A
0.00
001.
0000
0.99
40..
.0.
9797
0.97
690.
0028
000.
9628
3B0.
9660
0.97
190.
9797
0.98
340.
0037
1.00
00
11 ⁄ 16
–8
or1.
0625
–8
UN
2A0.
0020
1.06
051.
0455
...
0.97
930.
9725
0.00
6827
0.91
172B
0.92
70.
952
0.98
130.
9902
0.00
891.
0625
3A0.
0000
1.06
251.
0475
...
0.98
130.
9762
0.00
5100
0.91
373B
0.92
700.
9422
0.98
130.
9880
0.00
671.
0625
11 ⁄ 16
–12
or1.
0625
–12
UN
2A0.
0017
1.06
081.
0494
...
1.00
671.
0010
0.00
5692
0.96
162B
0.97
20.
990
1.00
841.
0158
0.00
741.
0625
(7)
3A0.
0000
1.06
251.
0511
...
1.00
841.
0041
0.00
4300
0.96
333B
0.97
200.
9823
1.00
841.
0139
0.00
551.
0625
11 ⁄ 16
–16
or1.
0625
–16
UN
2A0.
0015
1.06
101.
0516
...
1.02
041.
0154
0.00
5018
0.98
662B
0.99
51.
009
1.02
191.
0284
0.00
651.
0625
(7)
3A0.
0000
1.06
251.
0531
...
1.02
191.
0181
0.00
3800
0.98
813B
0.99
501.
0034
1.02
191.
0268
0.00
491.
0625
15
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alPi
tch
Dia
met
eran
dD
iam
eter
,M
ajor
Dia
met
erD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
(7)
11 ⁄ 16
–18
or1.
0625
–18
UN
EF2A
0.00
141.
0611
1.05
24..
.1.
0250
1.02
020.
0047
760.
9949
2B1.
002
1.01
51.
0264
1.03
260.
0062
1.06
25(7
)3A
0.00
001.
0625
1.05
38..
.1.
0264
1.02
280.
0036
000.
9963
3B1.
0020
1.01
051.
0264
1.03
110.
0047
1.06
25
(7)
11 ⁄ 16
–20
or1.
0625
–20
UN
2A0.
0014
1.06
111.
0530
...
1.02
861.
0240
0.00
4573
1.00
162B
1.00
81.
020
1.03
001.
0359
0.00
591.
0625
(7)
3A0.
0000
1.06
251.
0544
...
1.03
001.
0266
0.00
3400
1.00
303B
1.00
801.
0161
1.03
001.
0345
0.00
451.
0625
11 ⁄ 16
–28
or1.
0625
–28
UN
2A0.
0012
1.06
131.
0548
...
1.03
811.
0341
0.00
4008
1.01
882B
1.02
41.
032
1.03
931.
0445
0.00
521.
0625
3A0.
0000
1.06
251.
0560
...
1.03
931.
0363
0.00
3000
1.02
003B
1.02
401.
0301
1.03
931.
0432
0.00
391.
0625
11 ⁄ 8–
7or
1.12
50–
7U
NC
1A0.
0022
1.12
281.
0982
...
1.03
001.
0191
0.01
0900
0.95
271B
0.97
0.99
81.
0322
1.04
630.
0141
1.12
50(7
)2A
0.00
221.
1228
1.10
641.
0982
1.03
001.
0228
0.00
7250
0.95
272B
0.97
00.
998
1.03
221.
0416
0.00
941.
1250
3A0.
0000
1.12
501.
1086
...
1.03
221.
0268
0.00
5400
0.95
493B
0.97
000.
9875
1.03
221.
0393
0.00
711.
1250
11 ⁄ 8–
8or
1.12
50–
8U
N2A
0.00
211.
1229
1.10
791.
1004
1.04
171.
0348
0.00
6901
0.97
412B
0.99
01.
015
1.04
381.
0528
0.00
901.
1250
3A0.
0000
1.12
501.
1100
...
1.04
381.
0386
0.00
5200
0.97
623B
0.99
001.
0047
1.04
381.
0505
0.00
671.
1250
11 ⁄ 8–
12or
1.12
50–
12U
NF
1A0.
0018
1.12
321.
1060
...
1.06
911.
0601
0.00
9000
1.02
401B
1.03
51.
053
1.07
091.
0826
0.01
171.
1250
2A0.
0018
1.12
321.
1118
...
1.06
911.
0631
0.00
6013
1.02
402B
1.03
51.
053
1.07
091.
0787
0.00
781.
1250
3A0.
0000
1.12
501.
1136
...
1.07
091.
0664
0.00
4500
1.02
583B
1.03
501.
0448
1.07
091.
0768
0.00
591.
1250
(7)
11 ⁄ 8–
16or
1.12
50–
16U
N2A
0.00
151.
1235
1.11
41..
.1.
0829
1.07
790.
0050
471.
0491
2B1.
057
1.07
11.
0844
1.09
100.
0066
1.12
50(7
)3A
0.00
001.
1250
1.11
56..
.1.
0844
1.08
060.
0038
001.
0506
3B1.
0570
1.06
591.
0844
1.08
930.
0049
1.12
50
(7)
11 ⁄ 8–
18or
1.12
50–
18U
NEF
2A0.
0014
1.12
361.
1149
...
1.08
751.
0827
0.00
4805
1.05
742B
1.06
51.
078
1.08
891.
0951
0.00
621.
1250
(7)
3A0.
0000
1.12
501.
1163
...
1.08
891.
0853
0.00
3600
1.05
883B
1.06
501.
0730
1.08
891.
0936
0.00
471.
1250
(7)
11 ⁄ 8–
20or
1.12
50–
20U
N2A
0.00
141.
1236
1.11
55..
.1.
0911
1.08
650.
0046
021.
0641
2B1.
071
1.08
21.
0925
1.09
850.
0060
1.12
50(7
)3A
0.00
001.
1250
1.11
69..
.1.
0925
1.08
900.
0035
001.
0655
3B1.
0710
1.07
861.
0925
1.09
700.
0045
1.12
50
11 ⁄ 8–
28or
1.12
50–
28U
N2A
0.00
121.
1238
1.11
73..
.1.
1006
1.09
660.
0040
371.
0813
2B1.
086
1.09
51.
1018
1.10
700.
0052
1.12
503A
0.00
001.
1250
1.11
85..
.1.
1018
1.09
880.
0030
001.
0825
3B1.
0860
1.09
261.
1018
1.10
570.
0039
1.12
50
13 ⁄ 16
–8
or1.
1875
–8
UN
2A0.
0021
1.18
541.
1704
...
1.10
421.
0972
0.00
6973
1.03
662B
1.05
21.
077
1.10
631.
1154
0.00
911.
1875
3A0.
0000
1.18
751.
1725
...
1.10
631.
1011
0.00
5200
1.03
873B
1.05
201.
0672
1.10
631.
1131
0.00
681.
1875
(7)
13 ⁄ 16
–12
or1.
1875
–12
UN
2A0.
0017
1.18
581.
1744
...
1.13
171.
1260
0.00
5749
1.08
662B
1.09
71.
115
1.13
341.
1409
0.00
751.
1875
3A0.
0000
1.18
751.
1761
...
1.13
341.
1291
0.00
4300
1.08
833B
1.09
701.
1073
1.13
341.
1390
0.00
561.
1875
16
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alPi
tch
Dia
met
eran
dD
iam
eter
,M
ajor
Dia
met
erD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
13 ⁄ 16
–16
or1.
1875
–16
UN
2A0.
0015
1.18
601.
1766
...
1.14
541.
1403
0.00
5075
1.11
162B
1.12
01.
134
1.14
691.
1535
0.00
661.
1875
(7)
3A0.
0000
1.18
751.
1781
...
1.14
691.
1431
0.00
3800
1.11
313B
1.12
001.
1284
1.14
691.
1518
0.00
491.
1875
(7)
13 ⁄ 16
–18
or1.
1875
–18
UN
EF2A
0.00
141.
1861
1.17
74..
.1.
1500
1.14
520.
0048
331.
1199
2B1.
127
1.14
01.
1514
1.15
770.
0063
1.18
753A
0.00
001.
1875
1.17
88..
.1.
1514
1.14
780.
0036
001.
1213
3B1.
1270
1.13
551.
1514
1.15
610.
0047
1.18
75
(7)
13 ⁄ 16
–20
or1.
1875
–20
UN
2A0.
0014
1.18
611.
1780
...
1.15
361.
1490
0.00
4630
1.12
662B
1.13
31.
145
1.15
501.
1610
0.00
601.
1875
(7)
3A0.
0000
1.18
751.
1794
...
1.15
501.
1515
0.00
3500
1.12
803B
1.13
301.
1411
1.15
501.
1595
0.00
451.
1875
13 ⁄ 16
–28
or1.
1875
–28
UN
2A0.
0012
1.18
631.
1798
...
1.16
311.
1590
0.00
4065
1.14
382B
1.14
91.
157
1.16
431.
1696
0.00
531.
1875
3A0.
0000
1.18
751.
1810
...
1.16
431.
1613
0.00
3000
1.14
503B
1.14
901.
1551
1.16
431.
1683
0.00
401.
1875
11 ⁄ 4–
7or
1.25
00–
7U
NC
1A0.
0022
1.24
781.
2232
...
1.15
501.
1439
0.01
1100
1.07
771B
1.09
51.
123
1.15
721.
1716
0.01
441.
2500
2A0.
0022
1.24
781.
2314
1.22
321.
1550
1.14
760.
0073
921.
0777
2B1.
095
1.12
31.
1572
1.16
680.
0096
1.25
003A
0.00
001.
2500
1.23
36..
.1.
1572
1.15
170.
0055
001.
0799
3B1.
0950
1.11
251.
1572
1.16
440.
0072
1.25
00
11 ⁄ 4–
8or
1.25
00–
8U
N2A
0.00
211.
2479
1.23
291.
2254
1.16
671.
1597
0.00
7043
1.09
912B
1.11
51.
140
1.16
881.
1780
0.00
921.
2500
3A0.
0000
1.25
001.
2350
...
1.16
881.
1635
0.00
5300
1.10
123B
1.11
501.
1297
1.16
881.
1757
0.00
691.
2500
11 ⁄ 4–
12or
1.25
00–
12U
NF
1A0.
0018
1.24
821.
2310
...
1.19
411.
1849
0.00
9200
1.14
901B
1.16
1.17
81.
1959
1.20
790.
0120
1.25
002A
0.00
181.
2482
1.23
68..
.1.
1941
1.18
790.
0061
551.
1490
2B1.
160
1.17
81.
1959
1.20
390.
0080
1.25
003A
0.00
001.
2500
1.23
86..
.1.
1959
1.19
130.
0046
001.
1508
3B1.
1600
1.16
981.
1959
1.20
190.
0060
1.25
00
11 ⁄ 4–
16or
1.25
00–
16U
N2A
0.00
151.
2485
1.23
91..
.1.
2079
1.20
280.
0051
031.
1741
2B1.
182
1.19
61.
2094
1.21
600.
0066
1.25
00(7
)3A
0.00
001.
2500
1.24
06..
.1.
2094
1.20
560.
0038
001.
1756
3B1.
1820
1.19
091.
2094
1.21
440.
0050
1.25
00
11 ⁄ 4–
18or
1.25
00–
18U
NEF
2A0.
0015
1.24
851.
2398
...
1.21
241.
2075
0.00
4861
1.18
232B
1.19
01.
203
1.21
391.
2202
0.00
631.
2500
3A0.
0000
1.25
001.
2413
...
1.21
391.
2103
0.00
3600
1.18
383B
1.19
001.
1980
1.21
391.
2186
0.00
471.
2500
11 ⁄ 4–
20or
1.25
00–
20U
N2A
0.00
141.
2486
1.24
05..
.1.
2161
1.21
140.
0046
581.
1891
2B1.
196
1.20
71.
2175
1.22
360.
0061
1.25
00(7
)3A
0.00
001.
2500
1.24
19..
.1.
2175
1.21
400.
0035
001.
1905
3B1.
1960
1.20
361.
2175
1.22
200.
0045
1.25
00
11 ⁄ 4–
28or
1.25
00–
28U
N2A
0.00
121.
2488
1.24
23..
.1.
2256
1.22
150.
0040
931.
2063
2B1.
211
1.22
01.
2268
1.23
210.
0053
1.25
003A
0.00
001.
2500
1.24
35..
.1.
2268
1.22
370.
0031
001.
2075
3B1.
2110
1.21
761.
2268
1.23
080.
0040
1.25
00
15 ⁄ 16
–8
or1.
3125
–8
UN
2A0.
0021
1.31
041.
2954
...
1.22
921.
2221
0.00
7110
1.16
162B
1.17
71.
202
1.23
131.
2405
0.00
921.
3125
3A0.
0000
1.31
251.
2975
...
1.23
131.
2260
0.00
5300
1.16
373B
1.17
701.
1922
1.23
131.
2382
0.00
691.
3125
17
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
15 ⁄ 16
–12
or1.
3125
–12
UN
2A0.
0017
1.31
081.
2994
...
1.25
671.
2509
0.00
5803
1.21
162B
1.22
21.
240
1.25
841.
2659
0.00
751.
3125
(7)
3A0.
0000
1.31
251.
3011
...
1.25
841.
2540
0.00
4400
1.21
333B
1.22
201.
2323
1.25
841.
2641
0.00
571.
3125
(7)
15 ⁄ 16
–16
or1.
3125
–16
UN
2A0.
0015
1.31
101.
3016
...
1.27
041.
2653
0.00
5129
1.23
662B
1.24
51.
259
1.27
191.
2786
0.00
671.
3125
(7)
3A0.
0000
1.31
251.
3031
...
1.27
191.
2681
0.00
3800
1.23
813B
1.24
501.
2534
1.27
191.
2769
0.00
501.
3125
(7)
15 ⁄ 16
–18
or1.
3125
–18
UN
EF2A
0.00
151.
3110
1.30
23..
.1.
2749
1.27
000.
0048
871.
2448
2B1.
252
1.26
51.
2764
1.28
280.
0064
1.31
25(7
)3A
0.00
001.
3125
1.30
38..
.1.
2764
1.27
270.
0037
001.
2463
3B1.
2520
1.26
051.
2764
1.28
120.
0048
1.31
25
15 ⁄ 16
–20
or1.
3125
–20
UN
2A0.
0014
1.31
111.
3030
...
1.27
861.
2739
0.00
4684
1.25
162B
1.25
81.
270
1.28
001.
2861
0.00
611.
3125
(7)
3A0.
0000
1.31
251.
3044
...
1.28
001.
2765
0.00
3500
1.25
303B
1.25
801.
2661
1.28
001.
2846
0.00
461.
3125
(7)
15 ⁄ 16
–28
or1.
3125
–28
UN
2A0.
0012
1.31
131.
3048
...
1.28
811.
2840
0.00
4119
1.26
882B
1.27
41.
282
1.28
931.
2947
0.00
541.
3125
3A0.
0000
1.31
251.
3060
...
1.28
931.
2862
0.00
3100
1.27
003B
1.27
401.
2801
1.28
931.
2933
0.00
401.
3125
13 ⁄ 8–
6or
1.37
50–
6U
NC
1A0.
0024
1.37
261.
3453
...
1.26
431.
2523
0.01
2000
1.17
411B
1.19
51.
225
1.26
671.
2822
0.01
551.
3750
2A0.
0024
1.37
261.
3544
1.34
531.
2643
1.25
630.
0079
701.
1741
2B1.
195
1.22
51.
2667
1.27
710.
0104
1.37
503A
0.00
001.
3750
1.35
68..
.1.
2667
1.26
070.
0060
001.
1765
3B1.
1950
1.21
461.
2667
1.27
450.
0078
1.37
50
13 ⁄ 8–
8or
1.37
50–
8U
N2A
0.00
221.
3728
1.35
781.
3503
1.29
161.
2844
0.00
7177
1.22
402B
1.24
01.
265
1.29
381.
3031
0.00
931.
3750
3A0.
0000
1.37
501.
3600
...
1.29
381.
2884
0.00
5400
1.22
623B
1.24
001.
2547
1.29
381.
3008
0.00
701.
3750
13 ⁄ 8–
12or
1.37
50–
12U
NF
1A0.
0019
1.37
311.
3559
...
1.31
901.
3096
0.00
9400
1.27
391B
1.28
51.
303
1.32
091.
3332
0.01
231.
3750
2A0.
0019
1.37
311.
3617
...
1.31
901.
3127
0.00
6289
1.27
392B
1.28
51.
303
1.32
091.
3291
0.00
821.
3750
3A0.
0000
1.37
501.
3636
...
1.32
091.
3162
0.00
4700
1.27
583B
1.28
501.
2948
1.32
091.
3270
0.00
611.
3750
(7)
13 ⁄ 8–
16or
1.37
50–
16U
N2A
0.00
151.
3735
1.36
41..
.1.
3329
1.32
770.
0051
551.
2991
2B1.
307
1.32
11.
3344
1.34
110.
0067
1.37
50(7
)3A
0.00
001.
3750
1.36
56..
.1.
3344
1.33
050.
0039
001.
3006
3B1.
3070
1.31
591.
3344
1.33
940.
0050
1.37
50
(7)
13 ⁄ 8–
18or
1.37
50–
18U
NEF
2A0.
0015
1.37
351.
3648
...
1.33
741.
3325
0.00
4913
1.30
732B
1.31
51.
328
1.33
891.
3453
0.00
641.
3750
(7)
3A0.
0000
1.37
501.
3663
...
1.33
891.
3352
0.00
3700
1.30
883B
1.31
501.
3230
1.33
891.
3437
0.00
481.
3750
13 ⁄ 8–
20or
1.37
50–
20U
N2A
0.00
141.
3736
1.36
55..
.1.
3411
1.33
640.
0047
101.
3141
2B1.
321
1.33
21.
3425
1.34
860.
0061
1.37
50(7
)3A
0.00
001.
3750
1.36
69..
.1.
3425
1.33
900.
0035
001.
3155
3B1.
3210
1.32
861.
3425
1.34
710.
0046
1.37
50
(7)
13 ⁄ 8–
28or
1.37
50–
28U
N2A
0.00
121.
3738
1.36
73..
.1.
3506
1.34
650.
0041
451.
3313
2B1.
336
1.34
51.
3518
1.35
720.
0054
1.37
503A
0.00
001.
3750
1.36
85..
.1.
3518
1.34
870.
0031
001.
3325
3B1.
3360
1.34
261.
3518
1.35
580.
0040
1.37
50
18
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alPi
tch
Dia
met
eran
dD
iam
eter
,M
ajor
Dia
met
erD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
17 ⁄ 16
–6
or1.
4375
–6
UN
2A0.
0024
1.43
511.
4169
...
1.32
681.
3188
0.00
8034
1.23
662B
1.25
71.
288
1.32
921.
3396
0.01
041.
4375
3A0.
0000
1.43
751.
4193
...
1.32
921.
3232
0.00
6000
1.23
903B
1.25
701.
2771
1.32
921.
3370
0.00
781.
4375
17 ⁄ 16
–8
or1.
4375
–8
UN
2A0.
0022
1.43
531.
4203
...
1.35
411.
3469
0.00
7241
1.28
652B
1.30
21.
327
1.35
631.
3657
0.00
941.
4375
3A0.
0000
1.43
751.
4225
...
1.35
631.
3509
0.00
5400
1.28
873B
1.30
201.
3172
1.35
631.
3634
0.00
711.
4375
17 ⁄ 16
–12
or1.
4375
–12
UN
2A0.
0018
1.43
571.
4243
...
1.38
161.
3757
0.00
5854
1.33
652B
1.34
71.
365
1.38
341.
3910
0.00
761.
4375
3A0.
0000
1.43
751.
4261
...
1.38
341.
3790
0.00
4400
1.33
833B
1.34
701.
3573
1.38
341.
3891
0.00
571.
4375
(7)
17 ⁄ 16
–16
or1.
4375
–16
UN
2A0.
0016
1.43
591.
4265
...
1.39
531.
3901
0.00
5180
1.36
152B
1.37
01.
384
1.39
691.
4036
0.00
671.
4375
(7)
3A0.
0000
1.43
751.
4281
...
1.39
691.
3930
0.00
3900
1.36
313B
1.37
001.
3784
1.39
691.
4020
0.00
511.
4375
(7)
17 ⁄ 16
–18
or1.
4375
–18
UN
EF2A
0.00
151.
4360
1.42
73..
.1.
3999
1.39
500.
0049
381.
3698
2B1.
377
1.39
01.
4014
1.40
780.
0064
1.43
753A
0.00
001.
4375
1.42
88..
.1.
4014
1.39
770.
0037
001.
3713
3B1.
3770
1.38
551.
4014
1.40
620.
0048
1.43
75
(7)
17 ⁄ 16
–20
or1.
4375
–20
UN
2A0.
0014
1.43
611.
4280
...
1.40
361.
3989
0.00
4735
1.37
662B
1.38
31.
395
1.40
501.
4112
0.00
621.
4375
(7)
3A0.
0000
1.43
751.
4294
...
1.40
501.
4014
0.00
3600
1.37
803B
1.38
301.
3911
1.40
501.
4096
0.00
461.
4375
(7)
17 ⁄ 16
–28
or1.
4375
–28
UN
2A0.
0013
1.43
621.
4297
...
1.41
301.
4088
0.00
4170
1.39
372B
1.39
91.
407
1.41
431.
4197
0.00
541.
4375
3A0.
0000
1.43
751.
4310
...
1.41
431.
4112
0.00
3100
1.39
503B
1.39
901.
4051
1.41
431.
4184
0.00
411.
4375
11 ⁄ 2–
6or
1.50
00–
6U
NC
1A0.
0024
1.49
761.
4703
...
1.38
931.
3772
0.01
2100
1.29
911B
1.32
1.35
1.39
171.
4075
0.01
581.
5000
2A0.
0024
1.49
761.
4794
1.47
031.
3893
1.38
120.
0080
971.
2991
2B1.
320
1.35
01.
3917
1.40
220.
0105
1.50
003A
0.00
001.
5000
1.48
18..
.1.
3917
1.38
560.
0061
001.
3015
3B1.
3200
1.33
961.
3917
1.39
960.
0079
1.50
00
11 ⁄ 2–
8or
1.50
00–
8U
N2A
0.00
221.
4978
1.48
281.
4753
1.41
661.
4093
0.00
7304
1.34
902B
1.36
51.
390
1.41
881.
4283
0.00
951.
5000
3A0.
0000
1.50
001.
4850
...
1.41
881.
4133
0.00
5500
1.35
123B
1.36
501.
3797
1.41
881.
4259
0.00
711.
5000
11 ⁄ 2–
12or
1.50
00–
12U
NF
1A0.
0019
1.49
811.
4809
...
1.44
401.
4344
0.00
9600
1.39
891B
1.41
1.42
81.
4459
1.45
840.
0125
1.50
002A
0.00
191.
4981
1.48
67..
.1.
4440
1.43
760.
0064
161.
3989
2B1.
410
1.42
81.
4459
1.45
420.
0083
1.50
003A
0.00
001.
5000
1.48
86..
.1.
4459
1.44
110.
0048
001.
4008
3B1.
4100
1.41
981.
4459
1.45
220.
0063
1.50
00
(7)
11 ⁄ 2–
16or
1.50
00–
16U
N2A
0.00
161.
4984
1.48
90..
.1.
4578
1.45
260.
0052
041.
4240
2B1.
432
1.44
61.
4594
1.46
620.
0068
1.50
003A
0.00
001.
5000
1.49
06..
.1.
4594
1.45
550.
0039
001.
4256
3B1.
4320
1.44
091.
4594
1.46
450.
0051
1.50
00
(7)
11 ⁄ 2–
18or
1.50
00–
18U
NEF
2A0.
0015
1.49
851.
4898
...
1.46
241.
4574
0.00
4962
1.43
232B
1.44
01.
453
1.46
391.
4704
0.00
651.
5000
3A0.
0000
1.50
001.
4913
...
1.46
391.
4602
0.00
3700
1.43
383B
1.44
001.
4480
1.46
391.
4687
0.00
481.
5000
19
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
11 ⁄ 2–
20or
1.50
00–
20U
N2A
0.00
141.
4986
1.49
05..
.1.
4661
1.46
130.
0047
591.
4391
2B1.
446
1.45
71.
4675
1.47
370.
0062
1.50
00(7
)3A
0.00
001.
5000
1.49
19..
.1.
4675
1.46
390.
0036
001.
4405
3B1.
4460
1.45
361.
4675
1.47
210.
0046
1.50
00
11 ⁄ 2–
28or
1.50
00–
28U
N2A
0.00
131.
4987
1.49
22..
.1.
4755
1.47
130.
0041
941.
4562
2B1.
461
1.47
01.
4768
1.48
230.
0055
1.50
003A
0.00
001.
5000
1.49
35..
.1.
4768
1.47
370.
0031
001.
4575
3B1.
4610
1.46
761.
4768
1.48
090.
0041
1.50
00
19 ⁄ 16
–6
or1.
5625
–6
UN
2A0.
0024
1.56
011.
5419
...
1.45
181.
4436
0.00
8159
1.36
162B
1.38
21.
413
1.45
421.
4648
0.01
061.
5625
3A0.
0000
1.56
251.
5443
...
1.45
421.
4481
0.00
6100
1.36
403B
1.38
201.
4021
1.45
421.
4622
0.00
801.
5625
19 ⁄ 16
–8
or1.
5625
–8
UN
2A0.
0022
1.56
031.
5453
...
1.47
911.
4717
0.00
7366
1.41
152B
1.42
71.
452
1.48
131.
4909
0.00
961.
5625
3A0.
0000
1.56
251.
5475
...
1.48
131.
4758
0.00
5500
1.41
373B
1.42
701.
4422
1.48
131.
4885
0.00
721.
5625
(7)
19 ⁄ 16
–12
or1.
5625
–12
UN
2A0.
0018
1.56
071.
5493
...
1.50
661.
5007
0.00
5902
1.46
152B
1.47
21.
490
1.50
841.
5161
0.00
771.
5625
(7)
3A0.
0000
1.56
251.
5511
...
1.50
841.
5040
0.00
4400
1.46
333B
1.47
201.
4823
1.50
841.
5142
0.00
581.
5625
19 ⁄ 16
–16
or1.
5625
–16
UN
2A0.
0016
1.56
091.
5515
...
1.52
031.
5151
0.00
5228
1.48
652B
1.49
51.
509
1.52
191.
5287
0.00
681.
5625
(7)
3A0.
0000
1.56
251.
5531
...
1.52
191.
5180
0.00
3900
1.48
813B
1.49
501.
5034
1.52
191.
5270
0.00
511.
5625
19 ⁄ 16
–18
or1.
5625
–18
UN
EF2A
0.00
151.
5610
1.55
23..
.1.
5249
1.51
990.
0049
861.
4948
2B1.
502
1.51
51.
5264
1.53
290.
0065
1.56
25(7
)3A
0.00
001.
5625
1.55
38..
.1.
5264
1.52
270.
0037
001.
4963
3B1.
5020
1.51
051.
5264
1.53
130.
0049
1.56
25
19 ⁄ 16
–20
or1.
5625
–20
UN
2A0.
0014
1.56
111.
5530
...
1.52
861.
5238
0.00
4783
1.50
162B
1.50
81.
520
1.53
001.
5362
0.00
621.
5625
(7)
3A0.
0000
1.56
251.
5544
...
1.53
001.
5264
0.00
3600
1.50
303B
1.50
801.
5161
1.53
001.
5347
0.00
471.
5625
15 ⁄ 8–
6or
1.62
50–
6U
N2A
0.00
251.
6225
1.60
43..
.1.
5142
1.50
600.
0082
191.
4240
2B1.
445
1.47
51.
5167
1.52
740.
0107
1.62
503A
0.00
001.
6250
1.60
68..
.1.
5167
1.51
050.
0062
001.
4265
3B1.
4450
1.46
461.
5167
1.52
470.
0080
1.62
50
15 ⁄ 8–
8or
1.62
50–
8U
N2A
0.00
221.
6228
1.60
781.
6003
1.54
161.
5342
0.00
7426
1.47
402B
1.49
01.
515
1.54
381.
5535
0.00
971.
6250
3A0.
0000
1.62
501.
6100
...
1.54
381.
5382
0.00
5600
1.47
623B
1.49
001.
5047
1.54
381.
5510
0.00
721.
6250
(7)
15 ⁄ 8–
12or
1.62
50–
12U
N2A
0.00
181.
6232
1.61
18..
.1.
5691
1.56
320.
0059
251.
5240
2B1.
535
1.55
31.
5709
1.57
860.
0077
1.62
50(7
)3A
0.00
001.
6250
1.61
36..
.1.
5709
1.56
650.
0044
001.
5258
3B1.
5350
1.54
481.
5709
1.57
670.
0058
1.62
50
(7)
15 ⁄ 8–
16or
1.62
50–
16U
N2A
0.00
161.
6234
1.61
40..
.1.
5828
1.57
750.
0052
511.
5490
2B1.
557
1.57
11.
5844
1.59
120.
0068
1.62
503A
0.00
001.
6250
1.61
56..
.1.
5844
1.58
050.
0039
001.
5506
3B1.
5570
1.56
591.
5844
1.58
950.
0051
1.62
50
(7)
15 ⁄ 8–
18or
1.62
50–
18U
NEF
2A0.
0015
1.62
351.
6148
...
1.58
741.
5824
0.00
5009
1.55
732B
1.56
51.
578
1.58
891.
5954
0.00
651.
6250
3A0.
0000
1.62
501.
6163
...
1.58
891.
5851
0.00
3800
1.55
883B
1.56
501.
5730
1.58
891.
5938
0.00
491.
6250
20
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
(7)
15 ⁄ 8–
20or
1.62
50–
20U
N2A
0.00
141.
6236
1.61
55..
.1.
5911
1.58
630.
0048
061.
5641
2B1.
571
1.58
21.
5925
1.59
870.
0062
1.62
503A
0.00
001.
6250
1.61
69..
.1.
5925
1.58
890.
0036
001.
5655
3B1.
5710
1.57
861.
5925
1.59
720.
0047
1.62
50
111⁄ 1
6–
6or
1.68
75–
6U
N2A
0.00
251.
6850
1.66
68..
.1.
5767
1.56
840.
0082
781.
4865
2B1.
507
1.53
81.
5792
1.59
000.
0108
1.68
753A
0.00
001.
6875
1.66
93..
.1.
5792
1.57
300.
0062
001.
4890
3B1.
5070
1.52
711.
5792
1.58
730.
0081
1.68
75
111⁄ 1
6–
8or
1.68
75–
8U
N2A
0.00
221.
6853
1.67
03..
.1.
6041
1.59
660.
0074
851.
5365
2B1.
552
1.57
71.
6063
1.61
600.
0097
1.68
753A
0.00
001.
6875
1.67
25..
.1.
6063
1.60
070.
0056
001.
5387
3B1.
5520
1.56
721.
6063
1.61
360.
0073
1.68
75
(7)
111⁄ 1
6–
12or
1.68
75–
12U
N2A
0.00
181.
6857
1.67
43..
.1.
6316
1.62
570.
0059
471.
5865
2B1.
597
1.61
51.
6334
1.64
110.
0077
1.68
753A
0.00
001.
6875
1.67
61..
.1.
6334
1.62
890.
0045
001.
5883
3B1.
5970
1.60
731.
6334
1.63
920.
0058
1.68
75
111⁄ 1
6–
16or
1.68
75–
16U
N2A
0.00
161.
6859
1.67
65..
.1.
6453
1.64
000.
0052
731.
6115
2B1.
620
1.63
41.
6469
1.65
380.
0069
1.68
75(7
)3A
0.00
001.
6875
1.67
81..
.1.
6469
1.64
290.
0040
001.
6131
3B1.
6200
1.62
841.
6469
1.65
200.
0051
1.68
75
(7)
111⁄ 1
6–
18or
1.68
75–
18U
NEF
2A0.
0015
1.68
601.
6773
...
1.64
991.
6449
0.00
5031
1.61
982B
1.62
71.
640
1.65
141.
6579
0.00
651.
6875
3A0.
0000
1.68
751.
6788
...
1.65
141.
6476
0.00
3800
1.62
133B
1.62
701.
6355
1.65
141.
6563
0.00
491.
6875
(7)
111⁄ 1
6–
20or
1.68
75–
20U
N2A
0.00
141.
6861
1.67
80..
.1.
6536
1.64
880.
0048
281.
6266
2B1.
633
1.64
51.
6550
1.66
130.
0063
1.68
75(7
)3A
0.00
001.
6875
1.67
94..
.1.
6550
1.65
140.
0036
001.
6280
3B1.
6330
1.64
111.
6550
1.65
970.
0047
1.68
75
(7)
13 ⁄ 4–
5or
1.75
00–
5U
NC
1A0.
0027
1.74
731.
7165
...
1.61
741.
6040
0.01
3400
1.50
911B
1.53
31.
567
1.62
011.
6375
0.01
741.
7500
(7)
2A0.
0027
1.74
731.
7268
1.71
651.
6174
1.60
850.
0089
221.
5091
2B1.
533
1.56
71.
6201
1.63
170.
0116
1.75
00(7
)3A
0.00
001.
7500
1.72
95..
.1.
6201
1.61
340.
0067
001.
5118
3B1.
5330
1.55
751.
6201
1.62
880.
0087
1.75
00
13 ⁄ 4–
6or
1.75
00–
6U
N2A
0.00
251.
7475
1.72
93..
.1.
6392
1.63
090.
0083
351.
5490
2B1.
570
1.60
01.
6417
1.65
250.
0108
1.75
003A
0.00
001.
7500
1.73
18..
.1.
6417
1.63
540.
0063
001.
5515
3B1.
5700
1.58
961.
6417
1.64
980.
0081
1.75
00
13 ⁄ 4–
8or
1.75
00–
8U
N2A
0.00
231.
7477
1.73
271.
7252
1.66
651.
6590
0.00
7542
1.59
892B
1.61
51.
640
1.66
881.
6786
0.00
981.
7500
(7)
3A0.
0000
1.75
001.
7350
...
1.66
881.
6631
0.00
5700
1.60
123B
1.61
501.
6297
1.66
881.
6762
0.00
741.
7500
13 ⁄ 4–
12or
1.75
00–
12U
N2A
0.00
181.
7482
1.73
68..
.1.
6941
1.68
810.
0059
691.
6490
2B1.
660
1.67
81.
6959
1.70
370.
0078
1.75
003A
0.00
001.
7500
1.73
86..
.1.
6959
1.69
140.
0045
001.
6508
3B1.
6600
1.66
981.
6959
1.70
170.
0058
1.75
00
13 ⁄ 4–
16or
1.75
00–
16U
N2A
0.00
161.
7484
1.73
90..
.1.
7078
1.70
250.
0052
951.
6740
2B1.
682
1.69
61.
7094
1.71
630.
0069
1.75
00(7
)3A
0.00
001.
7500
1.74
06..
.1.
7094
1.70
540.
0040
001.
6756
3B1.
6820
1.69
091.
7094
1.71
460.
0052
1.75
00
13 ⁄ 4–
20or
1.75
00–
20U
N2A
0.00
151.
7485
1.74
04..
.1.
7160
1.71
120.
0048
501.
6890
2B1.
696
1.70
71.
7175
1.72
380.
0063
1.75
00(7
)3A
0.00
001.
7500
1.74
19..
.1.
7175
1.71
390.
0036
001.
6905
3B1.
6960
1.70
361.
7175
1.72
220.
0047
1.75
00
21
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e4)
]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
113⁄ 1
6–
6or
1.81
25–
6U
N2A
0.00
251.
8100
1.79
18..
.1.
7017
1.69
330.
0083
911.
6115
2B1.
632
1.66
31.
7042
1.71
510.
0109
1.81
253A
0.00
001.
8125
1.79
43..
.1.
7042
1.69
790.
0063
001.
6140
3B1.
6320
1.65
211.
7042
1.71
240.
0082
1.81
25
113⁄ 1
6–
8or
1.81
25–
8U
N2A
0.00
231.
8102
1.79
52..
.1.
7290
1.72
140.
0075
981.
6614
2B1.
677
1.70
21.
7313
1.74
120.
0099
1.81
253A
0.00
001.
8125
1.79
75..
.1.
7313
1.72
560.
0057
001.
6637
3B1.
6770
1.69
221.
7313
1.73
870.
0074
1.81
25
113⁄ 1
6–
12or
1.81
25–
12U
N2A
0.00
181.
8107
1.79
93..
.1.
7566
1.75
060.
0059
901.
7115
2B1.
722
1.74
01.
7584
1.76
620.
0078
1.81
253A
0.00
001.
8125
1.80
11..
.1.
7584
1.75
390.
0045
001.
7133
3B1.
7220
1.73
231.
7584
1.76
420.
0058
1.81
25
113⁄ 1
6–
16or
1.81
25–
16U
N2A
0.00
161.
8109
1.80
15..
.1.
7703
1.76
500.
0053
161.
7365
2B1.
745
1.75
91.
7719
1.77
880.
0069
1.81
25(7
)3A
0.00
001.
8125
1.80
31..
.1.
7719
1.76
790.
0040
001.
7381
3B1.
7450
1.75
341.
7719
1.77
710.
0052
1.81
25
113⁄ 1
6–
20or
1.81
25–
20U
N2A
0.00
151.
8110
1.80
29..
.1.
7785
1.77
360.
0048
711.
7515
2B1.
758
1.77
01.
7800
1.78
630.
0063
1.81
25(7
)3A
0.00
001.
8125
1.80
44..
.1.
7800
1.77
630.
0037
001.
7530
3B1.
7580
1.76
611.
7800
1.78
470.
0047
1.81
25
17 ⁄ 8–
6or
1.87
50–
6U
N2A
0.00
251.
8725
1.85
43..
.1.
7642
1.75
580.
0084
471.
6740
2B1.
695
1.72
51.
7667
1.77
770.
0110
1.87
503A
0.00
001.
8750
1.85
68..
.1.
7667
1.76
040.
0063
001.
6765
3B1.
6950
1.71
461.
7667
1.77
490.
0082
1.87
50
17 ⁄ 8–
8or
1.87
50–
8U
N2A
0.00
231.
8727
1.85
771.
8502
1.79
151.
7838
0.00
7654
1.72
392B
1.74
01.
765
1.79
381.
8038
0.01
001.
8750
3A0.
0000
1.87
501.
8600
...
1.79
381.
7881
0.00
5700
1.72
623B
1.74
001.
7547
1.79
381.
8013
0.00
751.
8750
17 ⁄ 8–
12or
1.87
50–
12U
N2A
0.00
181.
8732
1.86
18..
.1.
8191
1.81
310.
0060
111.
7740
2B1.
785
1.80
31.
8209
1.82
870.
0078
1.87
50(7
)3A
0.00
001.
8750
1.86
36..
.1.
8209
1.81
640.
0045
001.
7758
3B1.
7850
1.79
481.
8209
1.82
680.
0059
1.87
50
17 ⁄ 8
–16
or1.
8750
–16
UN
2A0.
0016
1.87
341.
8640
...
1.83
281.
8275
0.00
5337
1.79
902B
1.80
71.
821
1.83
441.
8413
0.00
691.
8750
(7)
3A0.
0000
1.87
501.
8656
...
1.83
441.
8304
0.00
4000
1.80
063B
1.80
701.
8159
1.83
441.
8396
0.00
521.
8750
(7)
17 ⁄ 8–
20or
1.87
50–
20U
N2A
0.00
151.
8735
1.86
54..
.1.
8410
1.83
610.
0048
921.
8140
2B1.
821
1.83
21.
8425
1.84
890.
0064
1.87
50(7
)3A
0.00
001.
8750
1.86
69..
.1.
8425
1.83
880.
0037
001.
8155
3B1.
8210
1.82
861.
8425
1.84
730.
0048
1.87
50
115⁄ 1
6–
6or
1.93
75–
6U
N2A
0.00
261.
9349
1.91
67..
.1.
8266
1.81
810.
0085
011.
7364
2B1.
757
1.78
81.
8292
1.84
030.
0111
1.93
753A
0.00
001.
9375
1.91
93..
.1.
8292
1.82
280.
0064
001.
7390
3B1.
7570
1.77
711.
8292
1.83
750.
0083
1.93
75
115⁄ 1
6–
8or
1.93
75–
8U
N2A
0.00
231.
9352
1.92
02..
.1.
8540
1.84
630.
0077
081.
7864
2B1.
802
1.82
71.
8563
1.86
630.
0100
1.93
753A
0.00
001.
9375
1.92
25..
.1.
8563
1.85
050.
0058
001.
7887
3B1.
8020
1.81
721.
8563
1.86
380.
0075
1.93
75
(7)
115⁄ 1
6–
12or
1.93
75–
12U
N2A
0.00
181.
9357
1.92
43..
.1.
8816
1.87
560.
0060
311.
8365
2B1.
847
1.86
51.
8834
1.89
120.
0078
1.93
753A
0.00
001.
9375
1.92
61..
.1.
8834
1.87
890.
0045
001.
8383
3B1.
8470
1.85
731.
8834
1.88
930.
0059
1.93
75
22
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
115⁄ 1
6–
16or
1.93
75–
16U
N2A
0.00
161.
9359
1.92
65..
.1.
8953
1.88
990.
0053
571.
8615
2B1.
870
1.88
41.
8969
1.90
390.
0070
1.93
75(7
)3A
0.00
001.
9375
1.92
81..
.1.
8969
1.89
290.
0040
001.
8631
3B1.
8700
1.87
841.
8969
1.90
210.
0052
1.93
75
115⁄ 1
6–
20or
1.93
75–
20U
N2A
0.00
151.
9360
1.92
79..
.1.
9035
1.89
860.
0049
121.
8765
2B1.
883
1.89
51.
9050
1.91
140.
0064
1.93
75(7
)3A
0.00
001.
9375
1.92
94..
.1.
9050
1.90
130.
0037
001.
8780
3B1.
8830
1.89
111.
9050
1.90
980.
0048
1.93
75
2–
4.5
or2.
0000
–4.
5U
NC
1A0.
0029
1.99
711.
9641
...
1.85
281.
8385
0.01
4300
1.73
251B
1.75
91.
795
1.85
571.
8743
0.01
862.
0000
2A0.
0029
1.99
711.
9751
1.96
411.
8528
1.84
330.
0095
141.
7325
2B1.
759
1.79
51.
8557
1.86
810.
0124
2.00
003A
0.00
002.
0000
1.97
80..
.1.
8557
1.84
860.
0071
001.
7354
3B1.
7590
1.78
611.
8557
1.86
500.
0093
2.00
00
2–
6or
2.00
00–
6U
N2A
0.00
261.
9974
1.97
92..
.1.
8891
1.88
050.
0085
541.
7989
2B1.
820
1.85
01.
8917
1.90
280.
0111
2.00
003A
0.00
002.
0000
1.98
18..
.1.
8917
1.88
530.
0064
001.
8015
3B1.
8200
1.83
961.
8917
1.90
000.
0083
2.00
00
2–
8or
2.00
00–
8U
N2A
0.00
231.
9977
1.98
271.
9752
1.91
651.
9087
0.00
7761
1.84
892B
1.86
51.
890
1.91
881.
9289
0.01
012.
0000
3A0.
0000
2.00
001.
9850
...
1.91
881.
9130
0.00
5800
1.85
123B
1.86
501.
8797
1.91
881.
9264
0.00
762.
0000
2–
12or
2.00
00–
12U
N2A
0.00
181.
9982
1.98
68..
.1.
9441
1.93
800.
0060
511.
8990
2B1.
910
1.92
81.
9459
1.95
380.
0079
2.00
003A
0.00
002.
0000
1.98
86..
.1.
9459
1.94
140.
0045
001.
9008
3B1.
9100
1.91
981.
9459
1.95
180.
0059
2.00
00
2–
16or
2.00
00–
16U
N2A
0.00
161.
9984
1.98
90..
.1.
9578
1.95
240.
0053
771.
9240
2B1.
932
1.94
61.
9594
1.96
640.
0070
2.00
00(7
)3A
0.00
002.
0000
1.99
06..
.1.
9594
1.95
540.
0040
001.
9256
3B1.
9320
1.94
091.
9594
1.96
460.
0052
2.00
00
2–
20or
2.00
00–
20U
N2A
0.00
151.
9985
1.99
04..
.1.
9660
1.96
110.
0049
321.
9390
2B1.
946
1.95
71.
9675
1.97
390.
0064
2.00
00(7
)3A
0.00
002.
0000
1.99
19..
.1.
9675
1.96
380.
0037
001.
9405
3B1.
9460
1.95
361.
9675
1.97
230.
0048
2.00
00
21 ⁄ 8–
6or
2.12
50–
6U
N2A
0.00
262.
1224
2.10
42..
.2.
0141
2.00
540.
0086
581.
9239
2B1.
945
1.97
52.
0167
2.02
800.
0113
2.12
503A
0.00
002.
1250
2.10
68..
.2.
0167
2.01
020.
0065
001.
9265
3B1.
9450
1.96
462.
0167
2.02
510.
0084
2.12
50
21 ⁄ 8–
8or
2.12
50–
8U
N2A
0.00
242.
1226
2.10
762.
1001
2.04
142.
0335
0.00
7865
1.97
382B
1.99
02.
015
2.04
382.
0540
0.01
022.
1250
3A0.
0000
2.12
502.
1100
...
2.04
382.
0379
0.00
5900
1.97
623B
1.99
002.
0047
2.04
382.
0515
0.00
772.
1250
21 ⁄ 8–
12or
2.12
50–
12U
N2A
0.00
182.
1232
2.11
18..
.2.
0691
2.06
300.
0060
892.
0240
2B2.
035
2.05
32.
0709
2.07
880.
0079
2.12
50(7
)3A
0.00
002.
1250
2.11
36..
.2.
0709
2.06
630.
0046
002.
0258
3B2.
0350
2.04
482.
0709
2.07
680.
0059
2.12
50
21 ⁄ 8–
16or
2.12
50–
16U
N2A
0.00
162.
1234
2.11
40..
.2.
0828
2.07
740.
0054
152.
0490
2B2.
057
2.07
12.
0844
2.09
140.
0070
2.12
50(7
)3A
0.00
002.
1250
2.11
56..
.2.
0844
2.08
030.
0041
002.
0506
3B2.
0570
2.06
592.
0844
2.08
970.
0053
2.12
50
(7)
21 ⁄ 8–
20or
2.12
50–
20U
N2A
0.00
152.
1235
2.11
54..
.2.
0910
2.08
600.
0049
702.
0640
2B2.
071
2.08
22.
0925
2.09
900.
0065
2.12
50(7
)3A
0.00
002.
1250
2.11
69..
.2.
0925
2.08
880.
0037
002.
0655
3B2.
0710
2.07
862.
0925
2.09
730.
0048
2.12
50
23
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
21 ⁄ 4–
4.5
or2.
2500
–4.
5U
NC
1A0.
0029
2.24
712.
2141
...
2.10
282.
0882
0.01
4600
1.98
251B
2.00
92.
045
2.10
572.
1247
0.01
902.
2500
2A0.
0029
2.24
712.
2251
2.21
412.
1028
2.09
310.
0097
191.
9825
2B2.
009
2.04
52.
1057
2.11
830.
0126
2.25
003A
0.00
002.
2500
2.22
80..
.2.
1057
2.09
840.
0073
001.
9854
3B2.
0090
2.03
612.
1057
2.11
520.
0095
2.25
00
21 ⁄ 4–
6or
2.25
00–
6U
N2A
0.00
262.
2474
2.22
92..
.2.
1391
2.13
030.
0087
592.
0489
2B2.
070
2.10
02.
1417
2.15
310.
0114
2.25
003A
0.00
002.
2500
2.23
18..
.2.
1417
2.13
510.
0066
002.
0515
3B2.
0700
2.08
962.
1417
2.15
020.
0085
2.25
00
21 ⁄ 4–
8or
2.25
00–
8U
N2A
0.00
242.
2476
2.23
262.
2251
2.16
642.
1584
0.00
7966
2.09
882B
2.11
52.
140
2.16
882.
1792
0.01
042.
2500
3A0.
0000
2.25
002.
2350
...
2.16
882.
1628
0.00
6000
2.10
123B
2.11
502.
1297
2.16
882.
1766
0.00
782.
2500
(7)
21 ⁄ 4–
12or
2.25
00–
12U
N2A
0.00
182.
2482
2.23
68..
.2.
1941
2.18
800.
0061
272.
1490
2B2.
160
2.17
82.
1959
2.20
390.
0080
2.25
00(7
)3A
0.00
002.
2500
2.23
86..
.2.
1959
2.19
130.
0046
002.
1508
3B2.
1600
2.16
982.
1959
2.20
190.
0060
2.25
00
(7)
21 ⁄ 4–
16or
2.25
00–
16U
N2A
0.00
162.
2484
2.23
90..
.2.
2078
2.20
230.
0054
532.
1740
2B2.
182
2.19
62.
2094
2.21
650.
0071
2.25
00(7
)3A
0.00
002.
2500
2.24
06..
.2.
2094
2.20
530.
0041
002.
1756
3B2.
1820
2.19
092.
2094
2.21
470.
0053
2.25
00
(7)
21 ⁄ 4–
20or
2.25
00–
20U
N2A
0.00
152.
2485
2.24
04..
.2.
2160
2.21
100.
0050
082.
1890
2B2.
196
2.20
72.
2175
2.22
400.
0065
2.25
00(7
)3A
0.00
002.
2500
2.24
19..
.2.
2175
2.21
370.
0038
002.
1905
3B2.
1960
2.20
362.
2175
2.22
240.
0049
2.25
00
(7)
23 ⁄ 8–
6or
2.37
50–
6U
N2A
0.00
272.
3723
2.35
41..
.2.
2640
2.25
510.
0088
562.
1738
2B2.
195
2.22
52.
2667
2.27
820.
0115
2.37
503A
0.00
002.
3750
2.35
68..
.2.
2667
2.26
010.
0066
002.
1765
3B2.
1950
2.21
462.
2667
2.27
530.
0086
2.37
50
23 ⁄ 8–
8or
2.37
50–
8U
N2A
0.00
242.
3726
2.35
76..
.2.
2914
2.28
330.
0080
632.
2238
2B2.
240
2.26
52.
2938
2.30
430.
0105
2.37
503A
0.00
002.
3750
2.36
00..
.2.
2938
2.28
780.
0060
002.
2262
3B2.
2400
2.25
472.
2938
2.30
170.
0079
2.37
50
(7)
23 ⁄ 8–
12or
2.37
50–
12U
N2A
0.00
182.
3732
2.36
18..
.2.
3191
2.31
290.
0061
622.
2740
2B2.
285
2.30
32.
3209
2.32
890.
0080
2.37
503A
0.00
002.
3750
2.36
36..
.2.
3209
2.31
630.
0046
002.
2758
3B2.
2850
2.29
482.
3209
2.32
690.
0060
2.37
50
(7)
23 ⁄ 8–
16or
2.37
50–
16U
N2A
0.00
162.
3734
2.36
40..
.2.
3328
2.32
730.
0054
882.
2990
2B2.
307
2.32
12.
3344
2.34
150.
0071
2.37
50(7
)3A
0.00
002.
3750
2.36
56..
.2.
3344
2.33
030.
0041
002.
3006
3B2.
3070
2.31
592.
3344
2.33
980.
0054
2.37
50
(7)
23 ⁄ 8–
20or
2.37
50–
20U
N2A
0.00
152.
3735
2.36
54..
.2.
3410
2.33
600.
0050
432.
3140
2B2.
321
2.33
22.
3425
2.34
910.
0066
2.37
50(7
)3A
0.00
002.
3750
2.36
69..
.2.
3425
2.33
870.
0038
002.
3155
3B2.
3210
2.32
862.
3425
2.34
740.
0049
2.37
50
21 ⁄ 2–
4or
2.50
00–
4U
NC
1A0.
0031
2.49
692.
4612
...
2.33
452.
3190
0.01
5500
2.19
921B
2.22
92.
267
2.33
762.
3578
0.02
022.
5000
2A0.
0031
2.49
692.
4731
2.46
122.
3345
2.32
410.
0103
612.
1992
2B2.
229
2.26
72.
3376
2.35
110.
0135
2.50
003A
0.00
002.
5000
2.47
62..
.2.
3376
2.32
980.
0078
002.
2023
3B2.
2290
2.25
942.
3376
2.34
770.
0101
2.50
00
24
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
21 ⁄ 2–
6or
2.50
00–
6U
N2A
0.00
272.
4973
2.47
91..
.2.
3890
2.38
000.
0089
512.
2988
2B2.
320
2.35
02.
3917
2.40
330.
0116
2.50
003A
0.00
002.
5000
2.48
18..
.2.
3917
2.38
500.
0067
002.
3015
3B2.
3200
2.33
962.
3917
2.40
040.
0087
2.50
00
21 ⁄ 2–
8or
2.50
00–
8U
N2A
0.00
242.
4976
2.48
262.
4751
2.41
642.
4082
0.00
8158
2.34
882B
2.36
52.
390
2.41
882.
4294
0.01
062.
5000
3A0.
0000
2.50
002.
4850
...
2.41
882.
4127
0.00
6100
2.35
123B
2.36
502.
3797
2.41
882.
4268
0.00
802.
5000
21 ⁄ 2–
12or
2.50
00–
12U
N2A
0.00
192.
4981
2.48
67..
.2.
4440
2.43
780.
0061
972.
3989
2B2.
410
2.42
82.
4459
2.45
400.
0081
2.50
003A
0.00
002.
5000
2.48
86..
.2.
4459
2.44
130.
0046
002.
4008
3B2.
4100
2.41
982.
4459
2.45
190.
0060
2.50
00
21 ⁄ 2–
16or
2.50
00–
16U
N2A
0.00
172.
4983
2.48
89..
.2.
4577
2.45
220.
0055
232.
4239
2B2.
432
2.44
62.
4594
2.46
660.
0072
2.50
00(7
)3A
0.00
002.
5000
2.49
06..
.2.
4594
2.45
530.
0041
002.
4256
3B2.
4320
2.44
092.
4594
2.46
480.
0054
2.50
00
21 ⁄ 2–
20or
2.50
00–
20U
N2A
0.00
152.
4985
2.49
04..
.2.
4660
2.46
090.
0050
782.
4390
2B2.
446
2.45
72.
4675
2.47
410.
0066
2.50
00(7
)3A
0.00
002.
5000
2.49
19..
.2.
4675
2.46
370.
0038
002.
4405
3B2.
4460
2.45
362.
4675
2.47
250.
0050
2.50
00
25 ⁄ 8–
6or
2.62
50–
6U
N2A
0.00
272.
6223
2.60
41..
.2.
5140
2.50
500.
0090
422.
4238
2B2.
445
2.47
52.
5167
2.52
850.
0118
2.62
503A
0.00
002.
6250
2.60
68..
.2.
5167
2.50
990.
0068
002.
4265
3B2.
4450
2.46
462.
5167
2.52
550.
0088
2.62
50
25 ⁄ 8–
8or
2.62
50–
8U
N2A
0.00
252.
6225
2.60
75..
.2.
5413
2.53
310.
0082
492.
4737
2B2.
490
2.51
52.
5438
2.55
450.
0107
2.62
503A
0.00
002.
6250
2.61
00..
.2.
5438
2.53
760.
0062
002.
4762
3B2.
4900
2.50
472.
5438
2.55
180.
0080
2.62
50
(7)
25 ⁄ 8–
12or
2.62
50–
12U
N2A
0.00
192.
6231
2.61
17..
.2.
5690
2.56
280.
0062
302.
5239
2B2.
535
2.55
32.
5709
2.57
900.
0081
2.62
503A
0.00
002.
6250
2.61
36..
.2.
5709
2.56
620.
0047
002.
5258
3B2.
5350
2.54
482.
5709
2.57
700.
0061
2.62
50
(7)
25 ⁄ 8–
16or
2.62
50–
16U
N2A
0.00
172.
6233
2.61
39..
.2.
5827
2.57
710.
0055
562.
5489
2B2.
557
2.57
12.
5844
2.59
160.
0072
2.62
50(7
)3A
0.00
002.
6250
2.61
56..
.2.
5844
2.58
020.
0042
002.
5506
3B2.
5570
2.56
592.
5844
2.58
980.
0054
2.62
50
25 ⁄ 8–
20or
2.62
50–
20U
N2A
0.00
152.
6235
2.61
54..
.2.
5910
2.58
590.
0051
112.
5640
2B2.
571
2.58
22.
5925
2.59
910.
0066
2.62
50(7
)3A
0.00
002.
6250
2.61
69..
.2.
5925
2.58
870.
0038
002.
5655
3B2.
5710
2.57
862.
5925
2.59
750.
0050
2.62
50
23 ⁄ 4–
4or
2.75
00–
4U
NC
1A0.
0032
2.74
682.
7111
...
2.58
442.
5686
0.01
5800
2.44
911B
2.47
92.
517
2.58
762.
6082
0.02
062.
7500
2A0.
0032
2.74
682.
7230
2.71
112.
5844
2.57
390.
0105
422.
4491
2B2.
479
2.51
72.
5876
2.60
130.
0137
2.75
003A
0.00
002.
7500
2.72
62..
.2.
5876
2.57
970.
0079
002.
4523
3B2.
4790
2.50
942.
5876
2.59
790.
0103
2.75
00
23 ⁄ 4–
6or
2.75
00–
6U
N2A
0.00
272.
7473
2.72
91..
.2.
6390
2.62
990.
0091
322.
5488
2B2.
570
2.60
02.
6417
2.65
360.
0119
2.75
003A
0.00
002.
7500
2.73
18..
.2.
6417
2.63
490.
0068
002.
5515
3B2.
5700
2.58
962.
6417
2.65
060.
0089
2.75
00
23 ⁄ 4–
8or
2.75
00–
8U
N2A
0.00
252.
7475
2.73
252.
7250
2.66
632.
6580
0.00
8339
2.59
872B
2.61
52.
640
2.66
882.
6796
0.01
082.
7500
3A0.
0000
2.75
002.
7350
...
2.66
882.
6625
0.00
6300
2.60
123B
2.61
502.
6297
2.66
882.
6769
0.00
812.
7500
25
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
(7)
23 ⁄ 4–
12or
2.75
00–
12U
N2A
0.00
192.
7481
2.73
67..
.2.
6940
2.68
770.
0062
632.
6489
2B2.
660
2.67
82.
6959
2.70
400.
0081
2.75
00(7
)3A
0.00
002.
7500
2.73
86..
.2.
6959
2.69
120.
0047
002.
6508
3B2.
6600
2.66
982.
6959
2.70
200.
0061
2.75
00
(7)
23 ⁄ 4–
16or
2.75
00–
16U
N2A
0.00
172.
7483
2.73
89..
.2.
7077
2.70
210.
0055
892.
6739
2B2.
682
2.69
62.
7094
2.71
670.
0073
2.75
00(7
)3A
0.00
002.
7500
2.74
06..
.2.
7094
2.70
520.
0042
002.
6756
3B2.
6820
2.69
092.
7094
2.71
480.
0054
2.75
00
(7)
23 ⁄ 4–
20or
2.75
00–
20U
N2A
0.00
152.
7485
2.74
04..
.2.
7160
2.71
090.
0051
442.
6890
2B2.
696
2.70
72.
7175
2.72
420.
0067
2.75
00(7
)3A
0.00
002.
7500
2.74
19..
.2.
7175
2.71
360.
0039
002.
6905
3B2.
6960
2.70
362.
7175
2.72
250.
0050
2.75
00
27 ⁄ 8–
6or
2.87
50–
6U
N2A
0.00
282.
8722
2.85
40..
.2.
7639
2.75
470.
0092
192.
6737
2B2.
695
2.72
52.
7667
2.77
870.
0120
2.87
503A
0.00
002.
8750
2.85
68..
.2.
7667
2.75
980.
0069
002.
6765
3B2.
6950
2.71
462.
7667
2.77
570.
0090
2.87
50
27 ⁄ 8–
8or
2.87
50–
8U
N2A
0.00
252.
8725
2.85
75..
.2.
7913
2.78
290.
0084
262.
7237
2B2.
740
2.76
52.
7938
2.80
480.
0110
2.87
503A
0.00
002.
8750
2.86
00..
.2.
7938
2.78
750.
0063
002.
7262
3B2.
7400
2.75
472.
7938
2.80
200.
0082
2.87
50
27 ⁄ 8–
12or
2.87
50–
12U
N2A
0.00
192.
8731
2.86
17..
.2.
8190
2.81
270.
0062
942.
7739
2B2.
785
2.80
32.
8209
2.82
910.
0082
2.87
50(7
)3A
0.00
002.
8750
2.86
36..
.2.
8209
2.81
620.
0047
002.
7758
3B2.
7850
2.79
482.
8209
2.82
700.
0061
2.87
50
27 ⁄ 8–
16or
2.87
50–
16U
N2A
0.00
172.
8733
2.86
39..
.2.
8327
2.82
710.
0056
202.
7989
2B2.
807
2.82
12.
8344
2.84
170.
0073
2.87
50(7
)3A
0.00
002.
8750
2.86
56..
.2.
8344
2.83
020.
0042
002.
8006
3B2.
8070
2.81
592.
8344
2.83
990.
0055
2.87
50
(7)
27 ⁄ 8–
20or
2.87
50–
20U
N2A
0.00
162.
8734
2.86
53..
.2.
8409
2.83
570.
0051
752.
8139
2B2.
821
2.83
22.
8425
2.84
920.
0067
2.87
50(7
)3A
0.00
002.
8750
2.86
69..
.2.
8425
2.83
860.
0039
002.
8155
3B2.
8210
2.82
862.
8425
2.84
750.
0050
2.87
50
3–
4or
3.00
00–
4U
NC
1A0.
0032
2.99
682.
9611
...
2.83
442.
8183
0.01
6100
2.69
911B
2.72
92.
767
2.83
762.
8585
0.02
093.
0000
2A0.
0032
2.99
682.
9730
2.96
112.
8344
2.82
370.
0107
142.
6991
2B2.
729
2.76
72.
8376
2.85
150.
0139
3.00
003A
0.00
003.
0000
2.97
62..
.2.
8376
2.82
960.
0080
002.
7023
3B2.
7290
2.75
942.
8376
2.84
800.
0104
3.00
00
3–
6or
3.00
00–
6U
N2A
0.00
282.
9972
2.97
90..
.2.
8889
2.87
960.
0093
042.
7987
2B2.
820
2.85
02.
8917
2.90
380.
0121
3.00
003A
0.00
003.
0000
2.98
18..
.2.
8917
2.88
470.
0070
002.
8015
3B2.
8200
2.83
962.
8917
2.90
080.
0091
3.00
00
3–
8or
3.00
00–
8U
N2A
0.00
262.
9974
2.98
242.
9749
2.91
622.
9077
0.00
8511
2.84
862B
2.86
52.
890
2.91
882.
9299
0.01
113.
0000
3A0.
0000
3.00
002.
9850
...
2.91
882.
9124
0.00
6400
2.85
123B
2.86
502.
8797
2.91
882.
9271
0.00
833.
0000
3–
12or
3.00
00–
12U
N2A
0.00
192.
9981
2.98
67..
.2.
9440
2.93
770.
0063
242.
8989
2B2.
910
2.92
82.
9459
2.95
410.
0082
3.00
003A
0.00
003.
0000
2.98
86..
.2.
9459
2.94
120.
0047
002.
9008
3B2.
9100
2.91
982.
9459
2.95
210.
0062
3.00
00
(7)
3–
16or
3.00
00–
16U
N2A
0.00
172.
9983
2.98
89..
.2.
9577
2.95
210.
0056
502.
9239
2B2.
932
2.94
62.
9594
2.96
670.
0073
3.00
00(7
)3A
0.00
003.
0000
2.99
06..
.2.
9594
2.95
520.
0042
002.
9256
3B2.
9320
2.94
092.
9594
2.96
490.
0055
3.00
00
26
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
3–
20or
3.00
00–
20U
N2A
0.00
162.
9984
2.99
03..
.2.
9659
2.96
070.
0052
052.
9389
2B2.
946
2.95
72.
9675
2.97
430.
0068
3.00
00(7
)3A
0.00
003.
0000
2.99
19..
.2.
9675
2.96
360.
0039
002.
9405
3B2.
9460
2.95
362.
9675
2.97
260.
0051
3.00
00
31 ⁄ 8–
6or
3.12
50–
6U
N2A
0.00
283.
1222
3.10
40..
.3.
0139
3.00
450.
0093
882.
9237
2B2.
945
2.97
53.
0167
3.02
890.
0122
3.12
503A
0.00
003.
1250
3.10
68..
.3.
0167
3.00
970.
0070
002.
9265
3B2.
9450
2.96
463.
0167
3.02
590.
0092
3.12
50
31 ⁄ 8–
8or
3.12
50–
8U
N2A
0.00
263.
1224
3.10
74..
.3.
0412
3.03
260.
0085
952.
9736
2B2.
990
3.01
53.
0438
3.05
500.
0112
3.12
503A
0.00
003.
1250
3.11
00..
.3.
0438
3.03
740.
0064
002.
9762
3B2.
9900
3.00
473.
0438
3.05
220.
0084
3.12
50
(7)
31 ⁄ 8–
12or
3.12
50–
12U
N2A
0.00
193.
1231
3.11
17..
.3.
0690
3.06
260.
0063
543.
0239
2B3.
035
3.05
33.
0709
3.07
920.
0083
3.12
50(7
)3A
0.00
003.
1250
3.11
36..
.3.
0709
3.06
610.
0048
003.
0258
3B3.
0350
3.04
483.
0709
3.07
710.
0062
3.12
50
(7)
31 ⁄ 8–
16or
3.12
50–
16U
N2A
0.00
173.
1233
3.11
39..
.3.
0827
3.07
700.
0056
803.
0489
2B3.
057
3.07
13.
0844
3.09
180.
0074
3.12
50(7
)3A
0.00
003.
1250
3.11
56..
.3.
0844
3.08
010.
0043
003.
0506
3B3.
0570
3.06
593.
0844
3.08
990.
0055
3.12
50
31 ⁄ 4–
4or
3.25
00–
4U
NC
1A0.
0033
3.24
673.
2110
...
3.08
433.
0680
0.01
6300
2.94
901B
2.97
93.
017
3.08
763.
1088
0.02
123.
2500
2A0.
0033
3.24
673.
2229
3.21
103.
0843
3.07
340.
0108
792.
9490
2B2.
979
3.01
73.
0876
3.10
170.
0141
3.25
003A
0.00
003.
2500
3.22
62..
.3.
0876
3.07
940.
0082
002.
9523
3B2.
9790
3.00
943.
0876
3.09
820.
0106
3.25
00
31 ⁄ 4–
6or
3.25
00–
6U
N2A
0.00
283.
2472
3.22
90..
.3.
1389
3.12
940.
0094
693.
0487
2B3.
070
3.10
03.
1417
3.15
400.
0123
3.25
003A
0.00
003.
2500
3.23
18..
.3.
1417
3.13
460.
0071
003.
0515
3B3.
0700
3.08
963.
1417
3.15
090.
0092
3.25
00
31 ⁄ 4–
8or
3.25
00–
8U
N2A
0.00
263.
2474
3.23
243.
2249
3.16
623.
1575
0.00
8676
3.09
862B
3.11
53.
140
3.16
883.
1801
0.01
133.
2500
3A0.
0000
3.25
003.
2350
...
3.16
883.
1623
0.00
6500
3.10
123B
3.11
503.
1297
3.16
883.
1773
0.00
853.
2500
(7)
31 ⁄ 4–
12or
3.25
00–
12U
N2A
0.00
193.
2481
3.23
67..
.3.
1940
3.18
760.
0063
833.
1489
2B3.
160
3.17
83.
1959
3.20
420.
0083
3.25
00(7
)3A
0.00
003.
2500
3.23
86..
.3.
1959
3.19
110.
0048
003.
1508
3B3.
1600
3.16
983.
1959
3.20
210.
0062
3.25
00
(7)
31 ⁄ 4–
16or
3.25
00–
16U
N2A
0.00
173.
2483
3.23
89..
.3.
2077
3.20
200.
0057
093.
1739
2B3.
182
3.19
63.
2094
3.21
680.
0074
3.25
00(7
)3A
0.00
003.
2500
3.24
06..
.3.
2094
3.20
510.
0043
003.
1756
3B3.
1820
3.19
093.
2094
3.21
500.
0056
3.25
00
33 ⁄ 8–
6or
3.37
50–
6U
N2A
0.00
293.
3721
3.35
39..
.3.
2638
3.25
430.
0095
493.
1736
2B3.
195
3.22
53.
2667
3.27
910.
0124
3.37
503A
0.00
003.
3750
3.35
68..
.3.
2667
3.25
950.
0072
003.
1765
3B3.
1950
3.21
463.
2667
3.27
600.
0093
3.37
50
33 ⁄ 8–
8or
3.37
50–
8U
N2A
0.00
263.
3724
3.35
74..
.3.
2912
3.28
240.
0087
563.
2236
2B3.
240
3.26
53.
2938
3.30
520.
0114
3.37
503A
0.00
003.
3750
3.36
00..
.3.
2938
3.28
720.
0066
003.
2262
3B3.
2400
3.25
473.
2938
3.30
230.
0085
3.37
50
(7)
33 ⁄ 8–
12or
3.37
50–
12U
N2A
0.00
193.
3731
3.36
17..
.3.
3190
3.31
260.
0064
113.
2739
2B3.
285
3.30
33.
3209
3.32
920.
0083
3.37
503A
0.00
003.
3750
3.36
36..
.3.
3209
3.31
610.
0048
003.
2758
3B3.
2850
3.29
483.
3209
3.32
720.
0063
3.37
50
27
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
(7)
33 ⁄ 8–
16or
3.37
50–
16U
N2A
0.00
173.
3733
3.36
39..
.3.
3327
3.32
700.
0057
373.
2989
2B3.
307
3.32
13.
3344
3.34
190.
0075
3.37
50(7
)3A
0.00
003.
3750
3.36
56..
.3.
3344
3.33
010.
0043
003.
3006
3B3.
3070
3.31
593.
3344
3.34
000.
0056
3.37
50
31 ⁄ 2–
4or
3.50
00–
4U
NC
1A0.
0033
3.49
673.
4610
...
3.33
433.
3177
0.01
6600
3.19
901B
3.22
93.
267
3.33
763.
3591
0.02
153.
5000
2A0.
0033
3.49
673.
4729
3.46
103.
3343
3.32
330.
0110
363.
1990
2B3.
229
3.26
73.
3376
3.35
190.
0143
3.50
003A
0.00
003.
5000
3.47
62..
.3.
3376
3.32
930.
0083
003.
2023
3B3.
2290
3.25
943.
3376
3.34
840.
0108
3.50
00
31 ⁄ 2–
6or
3.50
00–
6U
N2A
0.00
293.
4971
3.47
89..
.3.
3888
3.37
920.
0096
263.
2986
2B3.
320
3.35
03.
3917
3.40
420.
0125
3.50
003A
0.00
003.
5000
3.48
18..
.3.
3917
3.38
450.
0072
003.
3015
3B3.
3200
3.33
963.
3917
3.40
110.
0094
3.50
00
31 ⁄ 2–
8or
3.50
00–
8U
N2A
0.00
263.
4974
3.48
243.
4749
3.41
623.
4074
0.00
8833
3.34
862B
3.36
53.
390
3.41
883.
4303
0.01
153.
5000
3A0.
0000
3.50
003.
4850
...
3.41
883.
4122
0.00
6600
3.35
123B
3.36
503.
3797
3.41
883.
4274
0.00
863.
5000
31 ⁄ 2–
12or
3.50
00–
12U
N2A
0.00
193.
4981
3.48
67..
.3.
4440
3.43
760.
0064
383.
3989
2B3.
410
3.42
83.
4459
3.45
430.
0084
3.50
003A
0.00
003.
5000
3.48
86..
.3.
4459
3.44
110.
0048
003.
4008
3B3.
4100
3.41
983.
4459
3.45
220.
0063
3.50
00
31 ⁄ 2–
16or
3.50
00–
16U
N2A
0.00
173.
4983
3.48
89..
.3.
4577
3.45
190.
0057
643.
4239
2B3.
432
3.44
63.
4594
3.46
690.
0075
3.50
00(7
)3A
0.00
003.
5000
3.49
06..
.3.
4594
3.45
510.
0043
003.
4256
3B3.
4320
3.44
093.
4594
3.46
500.
0056
3.50
00
35 ⁄ 8–
6or
3.62
50–
6U
N2A
0.00
293.
6221
3.60
39..
.3.
5138
3.50
410.
0097
033.
4236
2B3.
445
3.47
53.
5167
3.52
930.
0126
3.62
503A
0.00
003.
6250
3.60
68..
.3.
5167
3.50
940.
0073
003.
4265
3B3.
4450
3.46
463.
5167
3.52
620.
0095
3.62
50
35 ⁄ 8–
8or
3.62
50–
8U
N2A
0.00
273.
6223
3.60
73..
.3.
5411
3.53
220.
0089
103.
4735
2B3.
490
3.51
53.
5438
3.55
540.
0116
3.62
503A
0.00
003.
6250
3.61
00..
.3.
5438
3.53
710.
0067
003.
4762
3B3.
4900
3.50
473.
5438
3.55
250.
0087
3.62
50
35 ⁄ 8–
12or
3.62
50–
12U
N2A
0.00
193.
6231
3.61
17..
.3.
5690
3.56
250.
0064
653.
5239
2B3.
535
3.55
33.
5709
3.57
930.
0084
3.62
50(7
)3A
0.00
003.
6250
3.61
36..
.3.
5709
3.56
610.
0048
003.
5258
3B3.
5350
3.54
483.
5709
3.57
720.
0063
3.62
50
(7)
35 ⁄ 8–
16or
3.62
50–
16U
N2A
0.00
173.
6233
3.61
39..
.3.
5827
3.57
690.
0057
913.
5489
2B3.
557
3.57
13.
5844
3.59
190.
0075
3.62
503A
0.00
003.
6250
3.61
56..
.3.
5844
3.58
010.
0043
003.
5506
3B3.
5570
3.56
593.
5844
3.59
000.
0056
3.62
50
33 ⁄ 4–
4or
3.75
00–
4U
NC
1A0.
0034
3.74
663.
7109
...
3.58
423.
5674
0.01
6800
3.44
891B
3.47
93.
517
3.58
763.
6094
0.02
183.
7500
2A0.
0034
3.74
663.
7228
3.71
093.
5842
3.57
300.
0111
883.
4489
2B3.
479
3.51
73.
5876
3.60
210.
0145
3.75
003A
0.00
003.
7500
3.72
62..
.3.
5876
3.57
920.
0084
003.
4523
3B3.
4790
3.50
943.
5876
3.59
850.
0109
3.75
00
33 ⁄ 4–
6or
3.75
00–
6U
N2A
0.00
293.
7471
3.72
89..
.3.
6388
3.62
900.
0097
783.
5486
2B3.
570
3.60
03.
6417
3.65
440.
0127
3.75
003A
0.00
003.
7500
3.73
18..
.3.
6417
3.63
440.
0073
003.
5515
3B3.
5700
3.58
963.
6417
3.65
120.
0095
3.75
00
28
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
33 ⁄ 4–
8or
3.75
00–
8U
N2A
0.00
273.
7473
3.73
233.
7248
3.66
613.
6571
0.00
8985
3.59
852B
3.61
53.
640
3.66
883.
6805
0.01
173.
7500
3A0.
0000
3.75
003.
7350
...
3.66
883.
6621
0.00
6700
3.60
123B
3.61
503.
6297
3.66
883.
6776
0.00
883.
7500
(7)
33 ⁄ 4–
12or
3.75
00–
12U
N2A
0.00
193.
7481
3.73
67..
.3.
6940
3.68
750.
0064
913.
6489
2B3.
660
3.67
83.
6959
3.70
430.
0084
3.75
00(7
)3A
0.00
003.
7500
3.73
86..
.3.
6959
3.69
100.
0049
003.
6508
3B3.
6600
3.66
983.
6959
3.70
220.
0063
3.75
00
(7)
33 ⁄ 4–
16or
3.75
00–
16U
N2A
0.00
173.
7483
3.73
89..
.3.
7077
3.70
190.
0058
173.
6739
2B3.
682
3.69
63.
7094
3.71
700.
0076
3.75
00(7
)3A
0.00
003.
7500
3.74
06..
.3.
7094
3.70
500.
0044
003.
6756
3B3.
6820
3.69
093.
7094
3.71
510.
0057
3.75
00
37 ⁄ 8–
6or
3.87
50–
6U
N2A
0.00
303.
8720
3.85
38..
.3.
7637
3.75
380.
0098
523.
6735
2B3.
695
3.72
53.
7667
3.77
950.
0128
3.87
503A
0.00
003.
8750
3.85
68..
.3.
7667
3.75
930.
0074
003.
6765
3B3.
6950
3.71
463.
7667
3.77
630.
0096
3.87
50
37 ⁄ 8–
8or
3.87
50–
8U
N2A
0.00
273.
8723
3.85
73..
.3.
7911
3.78
200.
0090
593.
7235
2B3.
740
3.76
53.
7938
3.80
560.
0118
3.87
503A
0.00
003.
8750
3.86
00..
.3.
7938
3.78
700.
0068
003.
7262
3B3.
7400
3.75
473.
7938
3.80
260.
0088
3.87
50
37 ⁄ 8–
12or
3.87
50–
12U
N2A
0.00
203.
8730
3.86
16..
.3.
8189
3.81
240.
0065
173.
7738
2B3.
785
3.80
33.
8209
3.82
940.
0085
3.87
503A
0.00
003.
8750
3.86
36..
.3.
8209
3.81
600.
0049
003.
7758
3B3.
7850
3.79
483.
8209
3.82
730.
0064
3.87
50
(7)
37 ⁄ 8–
16or
3.87
50–
16U
N2A
0.00
183.
8732
3.86
38..
.3.
8326
3.82
680.
0058
433.
7988
2B3.
807
3.82
13.
8344
3.84
200.
0076
3.87
50(7
)3A
0.00
003.
8750
3.86
56..
.3.
8344
3.83
000.
0044
003.
8006
3B3.
8070
3.81
593.
8344
3.84
010.
0057
3.87
50
4–
4or
4.00
00–
4U
NC
1A0.
0034
3.99
663.
9609
...
3.83
423.
8172
0.01
7000
3.69
891B
3.72
93.
767
3.83
763.
8597
0.02
214.
0000
2A0.
0034
3.99
663.
9728
3.96
093.
8342
3.82
290.
0113
343.
6989
2B3.
729
3.76
73.
8376
3.85
230.
0147
4.00
003A
0.00
004.
0000
3.97
62..
.3.
8376
3.82
910.
0085
003.
7023
3B3.
7290
3.75
943.
8376
3.84
870.
0111
4.00
00
4–
6or
4.00
00–
6U
N2A
0.00
303.
9970
3.97
88..
.3.
8887
3.87
880.
0099
243.
7985
2B3.
820
3.85
03.
8917
3.90
460.
0129
4.00
003A
0.00
004.
0000
3.98
18..
.3.
8917
3.88
430.
0074
003.
8015
3B3.
8200
3.83
963.
8917
3.90
140.
0097
4.00
00
4–
8or
4.00
00–
8U
N2A
0.00
273.
9973
3.98
233.
9748
3.91
613.
9070
0.00
9131
3.84
852B
3.86
53.
890
3.91
883.
9307
0.01
194.
0000
3A0.
0000
4.00
003.
9850
...
3.91
883.
9120
0.00
6800
3.85
123B
3.86
503.
8797
3.91
883.
9277
0.00
894.
0000
4–
12or
4.00
00–
12U
N2A
0.00
203.
9980
3.98
66..
.3.
9439
3.93
740.
0065
423.
8988
2B3.
910
3.92
83.
9459
3.95
440.
0085
4.00
003A
0.00
004.
0000
3.98
86..
.3.
9459
3.94
100.
0049
003.
9008
3B3.
9100
3.91
983.
9459
3.95
230.
0064
4.00
00
4–
16or
4.00
00–
16U
N2A
0.00
183.
9982
3.98
88..
.3.
9576
3.95
170.
0058
683.
9238
2B3.
932
3.94
63.
9594
3.96
700.
0076
4.00
00(7
)3A
0.00
004.
0000
3.99
06..
.3.
9594
3.95
500.
0044
003.
9256
3B3.
9320
3.94
093.
9594
3.96
510.
0057
4.00
00
41 ⁄ 8–
6or
4.12
50–
6U
N2A
0.00
304.
1220
4.10
38..
.4.
0137
4.00
370.
0099
963.
9235
2B3.
945
3.97
54.
0167
4.02
970.
0130
4.12
503A
0.00
004.
1250
4.10
68..
.4.
0167
4.00
920.
0075
003.
9265
3B3.
9450
3.96
464.
0167
4.02
640.
0097
4.12
50
29
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]M
inor
Func
tion
alD
iam
eter
Ser
ies
Max
.M
ajor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
41 ⁄ 8–
8or
4.12
50–
8U
N2A
0.00
284.
1222
4.10
72..
.4.
0410
4.03
180.
0092
033.
9734
2B3.
990
4.01
54.
0438
4.05
580.
0120
4.12
503A
0.00
004.
1250
4.11
00..
.4.
0438
4.03
690.
0069
003.
9762
3B3.
9900
4.00
474.
0438
4.05
280.
0090
4.12
50
(7)
41 ⁄ 8–
12or
4.12
50–
12U
N2A
0.00
204.
1230
4.11
16..
.4.
0689
4.06
230.
0065
674.
0238
2B4.
035
4.05
34.
0709
4.07
940.
0085
4.12
503A
0.00
004.
1250
4.11
36..
.4.
0709
4.06
600.
0049
004.
0258
3B4.
0350
4.04
484.
0709
4.07
730.
0064
4.12
50
(7)
41 ⁄ 8–
16or
4.12
50–
16U
N2A
0.00
184.
1232
4.11
38..
.4.
0826
4.07
670.
0058
934.
0488
2B4.
057
4.07
14.
0844
4.09
210.
0077
4.12
50(7
)3A
0.00
004.
1250
4.11
56..
.4.
0844
4.08
000.
0044
004.
0506
3B4.
0570
4.06
594.
0844
4.09
010.
0057
4.12
50
41 ⁄ 4–
4or
4.25
00–
4U
N2A
0.00
344.
2466
4.22
28..
.4.
0842
4.07
270.
0114
753.
9489
2B3.
979
4.01
74.
0876
4.10
250.
0149
4.25
003A
0.00
004.
2500
4.22
62..
.4.
0876
4.07
900.
0086
003.
9523
3B3.
9790
4.00
944.
0876
4.09
880.
0112
4.25
00
41 ⁄ 4–
6or
4.25
00–
6U
N2A
0.00
304.
2470
4.22
88..
.4.
1387
4.12
860.
0100
654.
0485
2B4.
070
4.10
04.
1417
4.15
480.
0131
4.25
003A
0.00
004.
2500
4.23
18..
.4.
1417
4.13
420.
0075
004.
0515
3B4.
0700
4.08
964.
1417
4.15
150.
0098
4.25
00
(7)
41 ⁄ 4–
8or
4.25
00–
8U
N2A
0.00
284.
2472
4.23
22..
.4.
1660
4.15
670.
0092
724.
0984
2B4.
115
4.14
04.
1688
4.18
090.
0121
4.25
00(7
)3A
0.00
004.
2500
4.23
50..
.4.
1688
4.16
180.
0070
004.
1012
3B4.
1150
4.12
974.
1688
4.17
780.
0090
4.25
00
(7)
41 ⁄ 4–
12or
4.25
00–
12U
N2A
0.00
204.
2480
4.23
66..
.4.
1939
4.18
730.
0065
914.
1488
2B4.
160
4.17
84.
1959
4.20
450.
0086
4.25
003A
0.00
004.
2500
4.23
86..
.4.
1959
4.19
100.
0049
004.
1508
3B4.
1600
4.16
984.
1959
4.20
230.
0064
4.25
00
(7)
41 ⁄ 4–
16or
4.25
00–
16U
N2A
0.00
184.
2482
4.23
88..
.4.
2076
4.20
170.
0059
174.
1738
2B4.
182
4.19
64.
2094
4.21
710.
0077
4.25
00(7
)3A
0.00
004.
2500
4.24
06..
.4.
2094
4.20
500.
0044
004.
1756
3B4.
1820
4.19
094.
2094
4.21
520.
0058
4.25
00
43 ⁄ 8–
6or
4.37
50–
6U
N2A
0.00
304.
3720
4.35
38..
.4.
2637
4.25
360.
0101
334.
1735
2B4.
195
4.22
54.
2667
4.27
990.
0132
4.37
503A
0.00
004.
3750
4.35
68..
.4.
2667
4.25
910.
0076
004.
1765
3B4.
1950
4.21
464.
2667
4.27
660.
0099
4.37
50
(7)
43 ⁄ 8–
8or
4.37
50–
8U
N2A
0.00
284.
3722
4.35
72..
.4.
2910
4.28
170.
0093
404.
2234
2B4.
240
4.26
54.
2938
4.30
590.
0121
4.37
503A
0.00
004.
3750
4.36
00..
.4.
2938
4.28
680.
0070
004.
2262
3B4.
2400
4.25
474.
2938
4.30
290.
0091
4.37
50
(7)
43 ⁄ 8–
12or
4.37
50–
12U
N2A
0.00
204.
3730
4.36
16..
.4.
3189
4.31
230.
0066
144.
2738
2B4.
285
4.30
34.
3209
4.32
950.
0086
4.37
50(7
)3A
0.00
004.
3750
4.36
36..
.4.
3209
4.31
590.
0050
004.
2758
3B4.
2850
4.29
484.
3209
4.32
730.
0064
4.37
50
(7)
43 ⁄ 8–
16or
4.37
50–
16U
N2A
0.00
184.
3732
4.36
38..
.4.
3326
4.32
670.
0059
404.
2988
2B4.
307
4.32
14.
3344
4.34
210.
0077
4.37
50(7
)3A
0.00
004.
3750
4.36
56..
.4.
3344
4.32
990.
0045
004.
3006
3B4.
3070
4.31
594.
3344
4.34
020.
0058
4.37
50
41 ⁄ 2–
4or
4.50
00–
4U
N2A
0.00
354.
4965
4.47
27..
.4.
3341
4.32
250.
0116
114.
1988
2B4.
229
4.26
74.
3376
4.35
270.
0151
4.50
003A
0.00
004.
5000
4.47
62..
.4.
3376
4.32
890.
0087
004.
2023
3B4.
2290
4.25
944.
3376
4.34
890.
0113
4.50
00
30
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
41 ⁄ 2–
6or
4.50
00–
6U
N2A
0.00
314.
4969
4.47
87..
.4.
3886
4.37
840.
0102
014.
2984
2B4.
320
4.35
04.
3917
4.40
500.
0133
4.50
003A
0.00
004.
5000
4.48
18..
.4.
3917
4.38
400.
0077
004.
3015
3B4.
3200
4.33
964.
3917
4.40
160.
0099
4.50
00
41 ⁄ 2–
8or
4.50
00–
8U
N2A
0.00
284.
4972
4.48
22..
.4.
4160
4.40
660.
0094
084.
3484
2B4.
365
4.39
04.
4188
4.43
100.
0122
4.50
003A
0.00
004.
5000
4.48
50..
.4.
4188
4.41
170.
0071
004.
3512
3B4.
3650
4.37
974.
4188
4.42
800.
0092
4.50
00
(7)
41 ⁄ 2–
12or
4.50
00–
12U
N2A
0.00
204.
4980
4.48
66..
.4.
4439
4.43
730.
0066
374.
3988
2B4.
410
4.42
84.
4459
4.45
450.
0086
4.50
00(7
)3A
0.00
004.
5000
4.48
86..
.4.
4459
4.44
090.
0050
004.
4008
3B4.
4100
4.41
984.
4459
4.45
240.
0065
4.50
00
(7)
41 ⁄ 2–
16or
4.50
00–
16U
N2A
0.00
184.
4982
4.48
88..
.4.
4576
4.45
160.
0059
634.
4238
2B4.
432
4.44
64.
4594
4.46
720.
0078
4.50
00(7
)3A
0.00
004.
5000
4.49
06..
.4.
4594
4.45
490.
0045
004.
4256
3B4.
4320
4.44
094.
4594
4.46
520.
0058
4.50
00
45 ⁄ 8–
6or
4.62
50–
6U
N2A
0.00
314.
6219
4.60
37..
.4.
5136
4.50
330.
0102
684.
4234
2B4.
445
4.47
54.
5167
4.53
000.
0133
4.62
503A
0.00
004.
6250
4.60
68..
.4.
5167
4.50
900.
0077
004.
4265
3B4.
4450
4.46
464.
5167
4.52
670.
0100
4.62
50
(7)
45 ⁄ 8–
8or
4.62
50–
8U
N2A
0.00
284.
6222
4.60
72..
.4.
5410
4.53
150.
0094
754.
4734
2B4.
490
4.51
54.
5438
4.55
610.
0123
4.62
50(7
)3A
0.00
004.
6250
4.61
00..
.4.
5438
4.53
670.
0071
004.
4762
3B4.
4900
4.50
474.
5438
4.55
300.
0092
4.62
50
45 ⁄ 8–
12or
4.62
50–
12U
N2A
0.00
204.
6230
4.61
16..
.4.
5689
4.56
220.
0066
604.
5238
2B4.
535
4.55
34.
5709
4.57
960.
0087
4.62
50(7
)3A
0.00
004.
6250
4.61
36..
.4.
5709
4.56
590.
0050
004.
5258
3B4.
5350
4.54
484.
5709
4.57
740.
0066
4.62
50
(7)
45 ⁄ 8–
16or
4.62
50–
16U
N2A
0.00
184.
6232
4.61
38..
.4.
5826
4.57
660.
0059
864.
5488
2B4.
557
4.57
14.
5844
4.59
220.
0078
4.62
50(7
)3A
0.00
004.
6250
4.61
56..
.4.
5844
4.57
990.
0045
004.
5506
3B4.
5570
4.56
594.
5844
4.59
020.
0058
4.62
50
43 ⁄ 4–
4or
4.75
00–
4U
N2A
0.00
354.
7465
4.72
27..
.4.
5841
4.57
240.
0117
434.
4488
2B4.
479
4.51
74.
5876
4.60
290.
0153
4.75
003A
0.00
004.
7500
4.72
62..
.4.
5876
4.57
880.
0088
004.
4523
3B4.
4790
4.50
944.
5876
4.59
900.
0114
4.75
00
43 ⁄ 4–
6or
4.75
00–
6U
N2A
0.00
314.
7469
4.72
87..
.4.
6386
4.62
830.
0103
334.
5484
2B4.
570
4.60
04.
6417
4.65
510.
0134
4.75
003A
0.00
004.
7500
4.73
18..
.4.
6417
4.63
400.
0077
004.
5515
3B4.
5700
4.58
964.
6417
4.65
180.
0101
4.75
00
43 ⁄ 4–
8or
4.75
00–
8U
N2A
0.00
294.
7471
4.73
21..
.4.
6659
4.65
640.
0095
404.
5983
2B4.
615
4.64
04.
6688
4.68
120.
0124
4.75
00(7
)3A
0.00
004.
7500
4.73
50..
.4.
6688
4.66
160.
0072
004.
6012
3B4.
6150
4.62
974.
6688
4.67
810.
0093
4.75
00
43 ⁄ 4–
12or
4.75
00–
12U
N2A
0.00
204.
7480
4.73
66..
.4.
6939
4.68
720.
0066
824.
6488
2B4.
660
4.67
84.
6959
4.70
460.
0087
4.75
00(7
)3A
0.00
004.
7500
4.73
86..
.4.
6959
4.69
090.
0050
004.
6508
3B4.
6600
4.66
984.
6959
4.70
240.
0065
4.75
00
(7)
43 ⁄ 4–
16or
4.75
00–
16U
N2A
0.00
184.
7482
4.73
88..
.4.
7076
4.70
160.
0060
084.
6738
2B4.
682
4.69
64.
7094
4.71
720.
0078
4.75
00(7
)3A
0.00
004.
7500
4.74
06..
.4.
7094
4.70
490.
0045
004.
6756
3B4.
6820
4.69
094.
7094
4.71
530.
0059
4.75
00
31
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
47 ⁄ 8–
6or
4.87
50–
6U
N2A
0.00
314.
8719
4.85
37..
.4.
7636
4.75
320.
0103
984.
6734
2B4.
695
4.72
54.
7667
4.78
020.
0135
4.87
503A
0.00
004.
8750
4.85
68..
.4.
7667
4.75
890.
0078
004.
6765
3B4.
6950
4.71
464.
7667
4.77
680.
0101
4.87
50
47 ⁄ 8–
8or
4.87
50–
8U
N2A
0.00
294.
8721
4.85
71..
.4.
7909
4.78
130.
0096
054.
7233
2B4.
740
4.76
54.
7938
4.80
630.
0125
4.87
503A
0.00
004.
8750
4.86
00..
.4.
7938
4.78
660.
0072
004.
7262
3B4.
7400
4.75
474.
7938
4.80
320.
0094
4.87
50
47 ⁄ 8–
12or
4.87
50–
12U
N2A
0.00
204.
8730
4.86
16..
.4.
8189
4.81
220.
0067
044.
7738
2B4.
785
4.80
34.
8209
4.82
960.
0087
4.87
50(7
)3A
0.00
004.
8750
4.86
36..
.4.
8209
4.81
590.
0050
004.
7758
3B4.
7850
4.79
484.
8209
4.82
740.
0065
4.87
50
(7)
47 ⁄ 8–
16or
4.87
50–
16U
N2A
0.00
184.
8732
4.86
38..
.4.
8326
4.82
660.
0060
304.
7988
2B4.
807
4.82
14.
8344
4.84
220.
0078
4.87
50(7
)3A
0.00
004.
8750
4.86
56..
.4.
8344
4.82
990.
0045
004.
8006
3B4.
8070
4.81
594.
8344
4.84
030.
0059
4.87
50
5–
4or
5.00
00–
4U
N2A
0.00
364.
9964
4.97
26..
.4.
8340
4.82
210.
0118
724.
6987
2B4.
729
4.76
74.
8376
4.85
300.
0154
5.00
003A
0.00
005.
0000
4.97
62..
.4.
8376
4.82
870.
0089
004.
7023
3B4.
7290
4.75
944.
8376
4.84
920.
0116
5.00
00
5–
6or
5.00
00–
6U
N2A
0.00
314.
9969
4.97
87..
.4.
8886
4.87
810.
0104
624.
7984
2B4.
820
4.85
04.
8917
4.90
530.
0136
5.00
003A
0.00
005.
0000
4.98
18..
.4.
8917
4.88
390.
0078
004.
8015
3B4.
8200
4.83
964.
8917
4.90
190.
0102
5.00
00
5–
8or
5.00
00–
8U
N2A
0.00
294.
9971
4.98
21..
.4.
9159
4.90
620.
0096
694.
8483
2B4.
865
4.89
04.
9188
4.93
140.
0126
5.00
00(7
)3A
0.00
005.
0000
4.98
50..
.4.
9188
4.91
150.
0073
004.
8512
3B4.
8650
4.87
974.
9188
4.92
820.
0094
5.00
00
5–
12or
5.00
00–
12U
N2A
0.00
204.
9980
4.98
66..
.4.
9439
4.93
720.
0067
264.
8988
2B4.
910
4.92
84.
9459
4.95
460.
0087
5.00
003A
0.00
005.
0000
4.98
86..
.4.
9459
4.94
090.
0050
004.
9008
3B4.
9100
4.91
984.
9459
4.95
250.
0066
5.00
00
5–
16or
5.00
00–
16U
N2A
0.00
184.
9982
4.98
88..
.4.
9576
4.95
150.
0060
524.
9238
2B4.
932
4.94
64.
9594
4.96
730.
0079
5.00
00(7
)3A
0.00
005.
0000
4.99
06..
.4.
9594
4.95
490.
0045
004.
9256
3B4.
9320
4.94
094.
9594
4.96
530.
0059
5.00
00
51 ⁄ 8–
6or
5.12
50–
6U
N2A
0.00
325.
1218
5.10
36..
.5.
0135
5.00
300.
0105
254.
9233
2B4.
945
4.97
55.
0167
5.03
040.
0137
5.12
503A
0.00
005.
1250
5.10
68..
.5.
0167
5.00
880.
0079
004.
9265
3B4.
9450
4.96
465.
0167
5.02
700.
0103
5.12
50
(7)
51 ⁄ 8–
8or
5.12
50–
8U
N2A
0.00
295.
1221
5.10
71..
.5.
0409
5.03
120.
0097
324.
9733
2B4.
990
5.01
55.
0438
5.05
650.
0127
5.12
503A
0.00
005.
1250
5.11
00..
.5.
0438
5.03
650.
0073
004.
9762
3B4.
9900
5.00
475.
0438
5.05
330.
0095
5.12
50
(7)
51 ⁄ 8–
12or
5.12
50–
12U
N2A
0.00
205.
1230
5.11
16..
.5.
0689
5.06
220.
0067
475.
0238
2B5.
035
5.05
35.
0709
5.07
970.
0088
5.12
50(7
)3A
0.00
005.
1250
5.11
36..
.5.
0709
5.06
580.
0051
005.
0258
3B5.
0350
5.04
485.
0709
5.07
750.
0066
5.12
50
51 ⁄ 8–
16or
5.12
50–
16U
N2A
0.00
185.
1232
5.11
38..
.5.
0826
5.07
650.
0060
735.
0488
2B5.
057
5.07
15.
0844
5.09
230.
0079
5.12
50(7
)3A
0.00
005.
1250
5.11
56..
.5.
0844
5.07
980.
0046
005.
0506
3B5.
0570
5.06
595.
0844
5.09
030.
0059
5.12
50
32
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
51 ⁄ 4–
4or
5.25
00–
4U
N2A
0.00
365.
2464
5.22
26..
.5.
0840
5.07
200.
0119
974.
9487
2B4.
979
5.01
75.
0876
5.10
320.
0156
5.25
003A
0.00
005.
2500
5.22
62..
.5.
0876
5.07
860.
0090
004.
9523
3B4.
9790
5.00
945.
0876
5.09
930.
0117
5.25
00
51 ⁄ 4–
6or
5.25
00–
6U
N2A
0.00
325.
2468
5.22
86..
.5.
1385
5.12
790.
0105
875.
0483
2B5.
070
5.10
05.
1417
5.15
550.
0138
5.25
003A
0.00
005.
2500
5.23
18..
.5.
1417
5.13
380.
0079
005.
0515
3B5.
0700
5.08
965.
1417
5.15
200.
0103
5.25
00
51 ⁄ 4–
8or
5.25
00–
8U
N2A
0.00
295.
2471
5.23
21..
.5.
1659
5.15
610.
0097
945.
0983
2B5.
115
5.14
05.
1688
5.18
150.
0127
5.25
00(7
)3A
0.00
005.
2500
5.23
50..
.5.
1688
5.16
150.
0073
005.
1012
3B5.
1150
5.12
975.
1688
5.17
830.
0095
5.25
00
(7)
51 ⁄ 4–
12or
5.25
00–
12U
N2A
0.00
205.
2480
5.23
66..
.5.
1939
5.18
710.
0067
685.
1488
2B5.
160
5.17
85.
1959
5.20
470.
0088
5.25
00(7
)3A
0.00
005.
2500
5.23
86..
.5.
1959
5.19
080.
0051
005.
1508
3B5.
1600
5.16
985.
1959
5.20
250.
0066
5.25
00
51 ⁄ 4–
16or
5.25
00–
16U
N2A
0.00
185.
2482
5.23
88..
.5.
2076
5.20
150.
0060
945.
1738
2B5.
182
5.19
65.
2094
5.21
730.
0079
5.25
00(7
)3A
0.00
005.
2500
5.24
06..
.5.
2094
5.20
480.
0046
005.
1756
3B5.
1820
5.19
095.
2094
5.21
530.
0059
5.25
00
53 ⁄ 8–
6or
5.37
50–
6U
N2A
0.00
325.
3718
5.35
36..
.5.
2635
5.25
290.
0106
495.
1733
2B5.
195
5.22
55.
2667
5.28
050.
0138
5.37
503A
0.00
005.
3750
5.35
68..
.5.
2667
5.25
870.
0080
005.
1765
3B5.
1950
5.21
465.
2667
5.27
710.
0104
5.37
50
(7)
53 ⁄ 8–
8or
5.37
50–
8U
N2A
0.00
305.
3720
5.35
70..
.5.
2908
5.28
090.
0098
565.
2232
2B5.
240
5.26
55.
2938
5.30
660.
0128
5.37
50(7
)3A
0.00
005.
3750
5.36
00..
.5.
2938
5.28
640.
0074
005.
2262
3B5.
2400
5.25
475.
2938
5.30
340.
0096
5.37
50
(7)
53 ⁄ 8–
12or
5.37
50–
12U
N2A
0.00
205.
3730
5.36
16..
.5.
3189
5.31
210.
0067
895.
2738
2B5.
285
5.30
35.
3209
5.32
970.
0088
5.37
50(7
)3A
0.00
005.
3750
5.36
36..
.5.
3209
5.31
580.
0051
005.
2758
3B5.
2850
5.29
485.
3209
5.32
750.
0066
5.37
50
53 ⁄ 8–
16or
5.37
50–
16U
N2A
0.00
185.
3732
5.36
38..
.5.
3326
5.32
650.
0061
155.
2988
2B5.
307
5.32
15.
3344
5.34
230.
0079
5.37
50(7
)3A
0.00
005.
3750
5.36
56..
.5.
3344
5.32
980.
0046
005.
3006
3B5.
3070
5.31
595.
3344
5.34
040.
0060
5.37
50
51 ⁄ 2–
4or
5.50
00–
4U
N2A
0.00
365.
4964
5.47
26..
.5.
3340
5.32
190.
0121
195.
1987
2B5.
229
5.26
75.
3376
5.35
340.
0158
5.50
003A
0.00
005.
5000
5.47
62..
.5.
3376
5.32
850.
0091
005.
2023
3B5.
2290
5.25
945.
3376
5.34
940.
0118
5.50
00
51 ⁄ 2–
6or
5.50
00–
6U
N2A
0.00
325.
4968
5.47
86..
.5.
3885
5.37
780.
0107
095.
2983
2B5.
320
5.35
05.
3917
5.40
560.
0139
5.50
003A
0.00
005.
5000
5.48
18..
.5.
3917
5.38
370.
0080
005.
3015
3B5.
3200
5.33
965.
3917
5.40
210.
0104
5.50
00
51 ⁄ 2–
8or
5.50
00–
8U
N2A
0.00
305.
4970
5.48
20..
.5.
4158
5.40
590.
0099
165.
3482
2B5.
365
5.39
05.
4188
5.43
170.
0129
5.50
003A
0.00
005.
5000
5.48
50..
.5.
4188
5.41
140.
0074
005.
3512
3B5.
3650
5.37
975.
4188
5.42
850.
0097
5.50
00
(7)
51 ⁄ 2–
12or
5.50
00–
12U
N2A
0.00
205.
4980
5.48
66..
.5.
4439
5.43
710.
0068
095.
3988
2B5.
410
5.42
85.
4459
5.45
480.
0089
5.50
00(7
)3A
0.00
005.
5000
5.48
86..
.5.
4459
5.44
080.
0051
005.
4008
3B5.
4100
5.41
985.
4459
5.45
250.
0066
5.50
00
33
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
(7)
51 ⁄ 2–
16or
5.50
00–
16U
N2A
0.00
185.
4982
5.48
88..
.5.
4576
5.45
150.
0061
355.
4238
2B5.
432
5.44
65.
4594
5.46
740.
0080
5.50
00(7
)3A
0.00
005.
5000
5.49
06..
.5.
4594
5.45
480.
0046
005.
4256
3B5.
4320
5.44
095.
4594
5.46
540.
0060
5.50
00
55 ⁄ 8–
6or
5.62
50–
6U
N2A
0.00
325.
6218
5.60
36..
.5.
5135
5.50
270.
0107
695.
4233
2B5.
445
5.47
55.
5167
5.53
070.
0140
5.62
503A
0.00
005.
6250
5.60
68..
.5.
5167
5.50
860.
0081
005.
4265
3B5.
4450
5.46
465.
5167
5.52
720.
0105
5.62
50
55 ⁄ 8–
8or
5.62
50–
8U
N2A
0.00
305.
6220
5.60
70..
.5.
5408
5.53
080.
0099
765.
4732
2B5.
490
5.51
55.
5438
5.55
680.
0130
5.62
50(7
)3A
0.00
005.
6250
5.61
00..
.5.
5438
5.53
630.
0075
005.
4762
3B5.
4900
5.50
475.
5438
5.55
350.
0097
5.62
50
(7)
55 ⁄ 8–
12or
5.62
50–
12U
N2A
0.00
205.
6230
5.61
16..
.5.
5689
5.56
210.
0068
295.
5238
2B5.
535
5.55
35.
5709
5.57
980.
0089
5.62
50(7
)3A
0.00
005.
6250
5.61
36..
.5.
5709
5.56
580.
0051
005.
5258
3B5.
5350
5.54
485.
5709
5.57
760.
0067
5.62
50
(7)
55 ⁄ 8–
16or
5.62
50–
16U
N2A
0.00
185.
6232
5.61
38..
.5.
5826
5.57
640.
0061
555.
5488
2B5.
557
5.57
15.
5844
5.59
240.
0080
5.62
50(7
)3A
0.00
005.
6250
5.61
56..
.5.
5844
5.57
980.
0046
005.
5506
3B5.
5570
5.56
595.
5844
5.59
040.
0060
5.62
50
53 ⁄ 4–
4or
5.75
00–
4U
N2A
0.00
375.
7463
5.72
25..
.5.
5839
5.57
170.
0122
375.
4486
2B5.
479
5.51
75.
5876
5.60
350.
0159
5.75
003A
0.00
005.
7500
5.72
62..
.5.
5876
5.57
840.
0092
005.
4523
3B5.
4790
5.50
945.
5876
5.59
950.
0119
5.75
00
53 ⁄ 4–
6or
5.75
00–
6U
N2A
0.00
325.
7468
5.72
86..
.5.
6385
5.62
770.
0108
275.
5483
2B5.
570
5.60
05.
6417
5.65
580.
0141
5.75
003A
0.00
005.
7500
5.73
18..
.5.
6417
5.63
360.
0081
005.
5515
3B5.
5700
5.58
965.
6417
5.65
230.
0106
5.75
00
(7)
53 ⁄ 4–
8or
5.75
00–
8U
N2A
0.00
305.
7470
5.73
20..
.5.
6658
5.65
580.
0100
345.
5982
2B5.
615
5.64
05.
6688
5.68
180.
0130
5.75
003A
0.00
005.
7500
5.73
50..
.5.
6688
5.66
130.
0075
005.
6012
3B5.
6150
5.62
975.
6688
5.67
860.
0098
5.75
00
(7)
53 ⁄ 4–
12or
5.75
00–
12U
N2A
0.00
215.
7479
5.73
65..
.5.
6938
5.68
700.
0068
485.
6487
2B5.
660
5.67
85.
6959
5.70
480.
0089
5.75
00(7
)3A
0.00
005.
7500
5.73
86..
.5.
6959
5.69
080.
0051
005.
6508
3B5.
6600
5.66
985.
6959
5.70
260.
0067
5.75
00
(7)
53 ⁄ 4–
6or
5.75
00–
16U
N2A
0.00
195.
7481
5.73
87..
.5.
7075
5.70
130.
0061
745.
6737
2B5.
682
5.69
65.
7094
5.71
740.
0080
5.75
00(7
)3A
0.00
005.
7500
5.74
06..
.5.
7094
5.70
480.
0046
005.
6756
3B5.
6820
5.69
095.
7094
5.71
540.
0060
5.75
00
57 ⁄ 8–
6or
5.87
50–
6U
N2A
0.00
335.
8717
5.85
35..
.5.
7634
5.75
250.
0108
865.
6732
2B5.
695
5.72
55.
7667
5.78
090.
0142
5.87
503A
0.00
005.
8750
5.85
68..
.5.
7667
5.75
850.
0082
005.
6765
3B5.
6950
5.71
465.
7667
5.77
730.
0106
5.87
50
(7)
57 ⁄ 8–
8or
5.87
50–
8U
N2A
0.00
305.
8720
5.85
70..
.5.
7908
5.78
070.
0100
935.
7232
2B5.
740
5.76
55.
7938
5.80
690.
0131
5.87
503A
0.00
005.
8750
5.86
00..
.5.
7938
5.78
620.
0076
005.
7262
3B5.
7400
5.75
475.
7938
5.80
360.
0098
5.87
50
(7)
57 ⁄ 8–
12or
5.87
50–
12U
N2A
0.00
215.
8729
5.86
15..
.5.
8188
5.81
190.
0068
685.
7737
2B5.
785
5.80
35.
8209
5.82
980.
0089
5.87
503A
0.00
005.
8750
5.86
36..
.5.
8209
5.81
570.
0052
005.
7758
3B5.
7850
5.79
485.
8209
5.82
760.
0067
5.87
50
34
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e2
Lim
its
ofSi
zefo
rSt
anda
rdSe
ries
Thre
ads
(UN
/UN
R)(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(4
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(4)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Min
.M
ax.
Tole
ranc
e[N
ote
(6)]
Dia
met
er,
Thre
ads/
in.
nati
onCl
ass
Allo
wan
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
[Not
e(5
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
57 ⁄ 8–
16or
5.87
50–
16U
N2A
0.00
195.
8731
5.86
37..
.5.
8325
5.82
630.
0061
945.
7987
2B5.
807
5.82
15.
8344
5.84
250.
0081
5.87
50(7
)3A
0.00
005.
8750
5.86
56..
.5.
8344
5.82
980.
0046
005.
8006
3B5.
8070
5.81
595.
8344
5.84
040.
0060
5.87
50
6–
4or
6.00
00–
4U
N2A
0.00
375.
9963
5.97
25..
.5.
8339
5.82
150.
0123
535.
6986
2B5.
729
5.76
75.
8376
5.85
370.
0161
6.00
003A
0.00
006.
0000
5.97
62..
.5.
8376
5.82
830.
0093
005.
7023
3B5.
7290
5.75
945.
8376
5.84
960.
0120
6.00
00
6–
6or
6.00
00–
6U
N2A
0.00
335.
9967
5.97
85..
.5.
8884
5.87
750.
0109
435.
7982
2B5.
820
5.85
05.
8917
5.90
590.
0142
6.00
003A
0.00
006.
0000
5.98
18..
.5.
8917
5.88
350.
0082
005.
8015
3B5.
8200
5.83
965.
8917
5.90
240.
0107
6.00
00
(7)
6–
8or
6.00
00–
8U
N2A
0.00
305.
9970
5.98
20..
.5.
9158
5.90
570.
0101
505.
8482
2B5.
865
5.89
05.
9188
5.93
200.
0132
6.00
00(7
)3A
0.00
006.
0000
5.98
50..
.5.
9188
5.91
120.
0076
005.
8512
3B5.
8650
5.87
975.
9188
5.92
870.
0099
6.00
00
6–
12or
6.00
00–
12U
N2A
0.00
215.
9979
5.98
65..
.5.
9438
5.93
690.
0068
875.
8987
2B5.
910
5.92
85.
9459
5.95
490.
0090
6.00
003A
0.00
006.
0000
5.98
86..
.5.
9459
5.94
070.
0052
005.
9008
3B5.
9100
5.91
985.
9459
5.95
260.
0067
6.00
00
6–
16or
6.00
00–
16U
N2A
0.00
195.
9981
5.98
87..
.5.
9575
5.95
130.
0062
135.
9237
2B5.
932
5.94
65.
9594
5.96
750.
0081
6.00
00(7
)3A
0.00
006.
0000
5.99
06..
.5.
9594
5.95
470.
0047
005.
9256
3B5.
9320
5.94
095.
9594
5.96
550.
0061
6.00
00
GEN
ERA
LN
OTE
:S
erie
sde
sign
atio
nsh
own
indi
cate
sth
eU
Nth
read
form
;ho
wev
er,
the
UN
Rth
read
form
may
besp
ecifi
edby
subs
titu
ting
UN
Rin
plac
eof
UN
inal
lde
sign
atio
nsfo
rex
tern
alus
eon
ly.
NO
TES
:(1
)Th
read
clas
ses
may
beco
mbi
ned.
See
para
.4.
2.(2
)Fo
rCl
ass
2Ath
read
sha
ving
anad
diti
vefin
ish,
the
max
imum
maj
oran
dpi
tch
diam
eter
s,af
ter
coat
ing,
may
equa
lth
eba
sic
size
s,w
hose
valu
esar
eth
esa
me
asm
axim
umva
lues
show
nfo
rCl
ass
3Ain
thes
eco
lum
ns.
See
para
s.4.
1.1
and
4.1.
3.(3
)Fo
run
finis
hed
hot
mat
eria
l,no
tin
clud
ing
stan
dard
fast
ener
sw
ith
rolle
dth
read
s.(4
)S
eepa
ra.
5.2.
1fo
rFu
ncti
onal
Dia
met
er.
(5)
2Api
tch
diam
eter
tole
ranc
e(T
d 2)
islis
ted
and
used
toa
six
plac
ede
cim
alto
calc
ulat
eth
elis
ted
Clas
s1A
/1B
,2B
,3A
/3B
tole
ranc
esan
dCl
ass
1A/2
Aal
low
ance
san
dal
ldi
men
sion
allim
its
that
depe
ndup
onth
em.
(6)
Thes
eva
lues
are
for
refe
renc
eon
ly.
UN
seri
esex
tern
alth
read
max
imum
min
ordi
amet
eris
basi
c(D
1in
para
.11
)fo
rCl
ass
3Aan
dba
sic
min
usal
low
ance
for
Clas
ses
1Aan
d2A
.(7
)O
neor
mor
eof
the
num
bers
liste
din
this
row
have
been
chan
ged
toco
rrec
tfo
rca
lcul
atio
nan
dro
undi
nger
rors
.Th
eor
igin
alnu
mbe
rsfr
ompa
stis
sues
ofB
1.1
are
liste
din
App
endi
xE
and
are
for
refe
renc
eon
ly.
(8)
Form
erly
NF.
Not
are
com
men
ded
stan
dard
size
.To
lera
nces
and
allo
wan
ces
are
base
don
one
diam
eter
leng
thof
enga
gem
ent.
35
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
4 SCREW THREAD CLASSES
4.1 Thread Classes
Thread classes are distinguished from each other bythe amounts of tolerance and allowance. Classes 1A, 2A,and 3A apply to external threads only, and Classes 1B,2B, and 3B apply to internal threads only. Allowance isspecified only for Classes 1A and 2A and the allowanceis identical for both classes. Tolerance decreases as classnumber increases (e.g., tolerance for Class 3A is less thanthat for Class 2A, which is less than that for Class 1A).
4.1.1 Classes 1A and 1B Threads. Classes 1A (exter-nal) and 1B (internal) threads replaced AmericanNational Class 1 screw threads. These classes providefor applications where a liberal tolerance and an allow-ance are required to permit easy assembly even withslightly nicked threads. These classes are intended forordnance and other special uses. Maximum diametersof Class 1A threads are less than basic by the amountof the allowance (the allowance is identical to that forClass 2A). The allowance is not available for platingor coating; and consequently, in some cases it may benecessary to make special provisions in thread manufac-turing for accommodation of plating or coating. Theminimum diameters of Class 1B threads, whether or notplated or coated, are basic and consequently afford noallowance or clearance for assembly at maximum-mate-rial limits.
4.1.2 Classes 2A and 2B Threads. Classes 2A (exter-nal) and 2B (internal) threads are the most commonlyused thread classes for general applications, includingproduction of bolts, screws, nuts, and similar threadedfasteners.
The maximum diameters of Class 2A uncoatedthreads are less than basic by the amount of the allow-ance. The allowance minimizes galling and seizing inhigh-cycle wrench assembly, or it can be used to accom-modate plated finishes or other coating. However, forthreads with additive finish, the maximum diametersof Class 2A may be exceeded by the amount of theallowance; i.e., the 2A maximum diameters apply to anunplated part or to a part before plating, whereas thebasic diameters apply to a part after plating. The mini-mum diameters of Class 2B threads, whether or notplated or coated, are basic, affording no allowance orclearance in assembly at maximum-material limits.
4.1.3 Classes 3A and 3B Threads. Classes 3A (exter-nal) and 3B (internal) threads provide for applicationswhere closeness of fit and/or accuracy of thread ele-ments are important. The maximum diameters of Class3A threads and the minimum diameters of Class 3Bthreads, whether or not plated or coated, are basic,affording no allowance or clearance for assembly at max-imum-material limits.
36
4.2 Combinations of Classes
The requirements for screw thread fits for specificapplications are predicated on end use and can be metby specifying the proper combinations of thread classesfor the components. For example, a Class 2A externalthread may be used with a Class 1B, 2B, or 3B internalthread.
5 SCREW THREAD ALLOWANCE AND TOLERANCE
5.1 Allowance
Allowance is specified only for Classes 1A and 2Aexternal threads. For Class 1A threads, its purpose is topreclude the possibility of surface-to-surface fit betweenmating parts and it cannot be used to accommodateplating or coating. For Class 2A threads, the allowancemay be used to accommodate plating or coating. Allow-ance for Classes 1A and 2A is identical and is basedon Class 2A pitch diameter tolerance for the respectiveseries standard length of engagement and is applicablefor all lengths of engagement.
Formulas for allowance are given in para. 5.8.1(a).Applications of allowances to the basic thread form
are shown in Fig. 2.
EXAMPLE: 2.0625-12-UNS-2AFrom para. 5.8.1(a): Allowance, es p 0.300 Td2(2A).From para. 5.2, example (1): Td2(2A) p 0.006070.Therefore, es p 0.300 � 0.006070 p 0.001821, or 0.0018 in. when
rounded.
5.2 Pitch Diameter Tolerance, All ClassesNOTE: Refer to Table 1 for the standard series of diameter-pitchcombinations. Allowances and tolerances for standard seriesthreads are applied in Table 2. All other diameter-pitch combina-tions are considered nonstandard. Allowances and tolerances fornonstandard threads must be calculated using the appropriateformulas contained in this Standard.
The pitch diameter tolerances specified in Table 2 forall classes of the UNC and UNF series are based on alength of engagement equal to the basic major (nominal)diameter and are applicable for lengths of engagementfrom 5 pitches to up to 1.5 diameters. For the 4-UN,6-UN, and 8-UN series, the pitch diameter tolerancesspecified for Classes 2A, 2B, 3A, and 3B are based on alength of engagement equal to the basic major (nominal)diameter and are applicable for lengths of engagementup to 1.5 diameters.
The pitch diameter tolerances specified in Table 2 forall classes of the UNEF, 12-UN, 16-UN, 20-UN, 28-UN,and 32-UN series are based on a length of engagementof 9 pitches and are applicable for lengths of engagementfrom 5 to 15 pitches.
The pitch diameter tolerances specified in Table D-1of Nonmandatory Appendix D for all classes of the UNSseries are based on a length of engagement of 9 pitchesand are applicable for lengths of engagement from 5 to15 pitches.
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Formulas for pitch diameter tolerance are given inparas. 5.8.1(c) and 5.8.2(b).
Applications of tolerances to the thread form areshown in Figs. 2 and 3.
For special threads, tolerances and allowances shallbe computed from the formulas in paras. 5.8.1 and 5.8.2.If the length of engagement is between 5 and 15 pitchesor is unknown, use 9 pitches in the applicable formulas.For all other lengths of engagement, use the knownvalues.
EXAMPLES:
(1) 2.0625-12-UNS-2A (length of engagement not specified)
Td2 p 0.0015 3�D+ 0.0015�LE+ 0.015 3�P 2
Td2p 0.0015 3�2.0625+ 0.0015�9/12 + 0.015 3�0.08333333 2
Td2 p 0.001909 + 0.001299 + 0.002862
Td2 p 0.006070
(2) 2.0625-12-UNS-SE2A (18 pitches length of engagement)
Td2 p 0.0015 3�D+ 0.0015�LE + 0.015 3�P 2
Td2 p 0.0015 3�2.0625+ 0.0015�1.500 + 0.015 3�0.08333333 2
Td2 p 0.001909 + 0.001837 + 0.002862
Td2 p 0.006608
5.2.1 Functional Diameter. Functional diameter sizeincludes the effects of all variations in pitch diameter,thread form, and profile. The variations in the individualthread characteristics, such as flank angle, lead, taper,and roundness, on a given thread cause the measure-ments of the pitch diameter and functional diameterto vary from one another on most threads. The pitchdiameter and functional diameter on a given threadare equal to one another only when the thread form isperfect.
When required to inspect/evaluate either the pitchdiameter and/or the functional diameter for threadacceptance (see ASME B1.3), use the same limits of sizefor the appropriate thread size and class.
5.3 Special Lengths of Engagement, LE
For special applications, the required length ofengagement might be the determining factor in theproper selection of thread tolerances. When design con-siderations require nonstandard pitches or extreme con-ditions of engagement not covered by the tables, thetolerances may be adjusted using the formulas. It isparticularly important that changes in tolerance benoted by the user for external threads designated Class3A when using longer than standard lengths ofengagement.
5.3.1 Long LE Using Gage Length LG Equal to LE(a) High-Strength Materials Using Standard Pitch Diame-
ter Tolerances. For applications of long length of engage-ment of mating parts involving very high-strength
37
materials, increases in tolerances based on standardlength of engagement may be detrimental. In these cases,the tolerances based on the standard length of engage-ment may be applied to increased length of engagementthreads. This requires the GO thread gages to have aspecial length equal to the length of engagement.
(b) Standard Bolt, Added Allowance in Tapped Hole, LEIncreases. In some cases where greater than standardlength of engagement is required, it is desirable to usestandard externally threaded parts with tolerancesbased on standard length of engagement. For example,in the case of a standard bolt assembled into a tappedhole in aluminum, the designation of the bolt threadwill conform to that of a thread for a standard lengthof engagement.
To ensure proper assembly, the tapped hole threadinto which the bolt is assembled must not interfere withthe bolt thread. This could happen if no special provi-sions were made in the tapped hole thread due to thecumulative effect of lead variation on the bolt thread,inasmuch as the increased length of engagement exceedsthe thickness of the GO thread gage used for acceptanceof the bolt thread. To avoid this condition, an allowanceshould be provided in the tapped hole, the amount ofwhich should be the diameter equivalent of the cumula-tive lead variation for the increased length of engage-ment, which is one-half the pitch diameter toleranceof the bolt thread allowed for the standard length ofengagement. This requires the GO thread and GO plaingages to have a special length equal to the length ofengagement.
EXAMPLE: 0.5000-13UNC-SE2B; LEp1 in. (2 diameters); assem-bled with standard bolt thread.
Add allowance EIp 1⁄2Td2 for standard bolt thread. From Table3, column 5, 1⁄2Td2 (standard) p 0.0025. Therefore, the thread isredesignated to indicate a nonstandard internal thread with theallowance of 0.0025 added to the basic size of 0.5000. New designa-tion is 0.5025-13UNS-SE2B. Allowance is also added to the standardminor diameter size limits and to the adjusted pitch diameter sizelimits. See para. 6.6.1.
(c) Standard Internal Thread, Added Allowance on Exter-nal Thread, es, Increases. In some cases where greater thanstandard length of engagement is required, it is desirableto use standard internally threaded parts with tolerancesbased on standard length of engagement. In these casesan allowance should be added to the mating externalthread.
EXAMPLE: 0.3750-24UNF-SE2A; LEp0.88 in. (2.35 diameters);assembled with standard internal thread.
Add allowance, equal to 1⁄2TD2 for standard internal thread. FromTable 3, column 8, 1⁄2TD2 (standard)p0.00245, which is rounded to0.0025. Therefore, the thread is redesignated to indicate a nonstan-dard external thread with the allowance of 0.0025 subtracted fromthe basic size of 0.3750. New designation is 0.3725-24UNS-SE2A.The added allowance is also subtracted from the standard majordiameter size limits and from the adjusted pitch diameter sizelimits. See para. 6.6.1.
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 3 Allowable Variations in Lead and Equivalent Change in Functional DiameterGENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, Diameter, in.,Threads/in. Designation Class in. (±) 1⁄2Td2 (+) Class in. (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
0 – 80 or 0.060 – 80 UNF 2A 0.00052 0.00090 2B 0.00066 0.001153A 0.00038 0.00065 3B 0.00048 0.00085
1 – 64 or 0.073 – 64 UNC 2A 0.00058 0.00100 2B 0.00075 0.001303A 0.00043 0.00075 3B 0.00055 0.00095
1 – 72 or 0.073 – 72 UNF 2A 0.00055 0.00095 2B 0.00072 0.001253A 0.00040 0.00070 3B 0.00055 0.00095
2 – 56 or 0.086 – 56 UNC 2A 0.00061 0.00105 2B 0.00081 0.001403A 0.00046 0.00080 3B 0.00061 0.00105
2 – 64 or 0.086 – 64 UNF 2A 0.00058 0.00100 2B 0.00078 0.001353A 0.00043 0.00075 3B 0.00058 0.00100
3 – 48 or 0.099 – 48 UNC 2A 0.00066 0.00115 2B 0.00087 0.001503A 0.00049 0.00085 3B 0.00064 0.00110
3 – 56 or 0.099 – 56 UNF 2A 0.00064 0.00110 2B 0.00081 0.001403A 0.00046 0.00080 3B 0.00061 0.00105
4 – 40 or 0.112 – 40 UNC 2A 0.00072 0.00125 2B 0.00095 0.001653A 0.00055 0.00095 3B 0.00069 0.00120
4 – 48 or 0.112 – 48 UNF 2A 0.00069 0.00120 2B 0.00089 0.001553A 0.00052 0.00090 3B 0.00066 0.00115
5 – 40 or 0.125 – 40 UNC 2A 0.00075 0.00130 2B 0.00095 0.001653A 0.00055 0.00095 3B 0.00072 0.00125
5 – 44 or 0.125 – 44 UNF 2A 0.00072 0.00125 2B 0.00092 0.001603A 0.00055 0.00095 3B 0.00069 0.00120
6 – 32 or 0.138 – 32 UNC 2A 0.00081 0.00140 2B 0.00107 0.001853A 0.00061 0.00105 3B 0.00078 0.00135
6 – 40 or 0.138 – 40 UNF 2A 0.00075 0.00130 2B 0.00098 0.001703A 0.00058 0.00100 3B 0.00072 0.00125
8 – 32 or 0.164 – 32 UNC 2A 0.00084 0.00145 2B 0.00110 0.001903A 0.00064 0.00110 3B 0.00081 0.00140
8 – 36 or 0.164 – 36 UNF 2A 0.00081 0.00140 2B 0.00104 0.001803A 0.00061 0.00105 3B 0.00078 0.00135
10 – 24 or 0.190 – 24 UNC 2A 0.00095 0.00165 2B 0.00124 0.002153A 0.00072 0.00125 3B 0.00092 0.00160
10 – 32 or 0.190 – 32 UNF 2A 0.00087 0.00150 2B 0.00113 0.001953A 0.00066 0.00115 3B 0.00084 0.00145
12 – 24 or 0.216 – 24 UNC 2A 0.00098 0.00170 2B 0.00127 0.002203A 0.00075 0.00130 3B 0.00095 0.00165
12 – 28 or 0.216 – 28 UNF 2A 0.00092 0.00160 2B 0.00121 0.002103A 0.00069 0.00120 3B 0.00089 0.00155
12 – 32 or 0.216 – 32 UNEF 2A 0.00089 0.00155 2B 0.00118 0.002053A 0.00069 0.00120 3B 0.00089 0.00155
1⁄4 – 20 or 0.250 – 20 UNC 1A 0.00162 0.00280 1B 0.00211 0.003652A 0.00107 0.00185 2B 0.00141 0.002453A 0.00081 0.00140 3B 0.00104 0.00180
38
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, Diameter, in.Threads/in. Designation Class in. (±) 1⁄2Td2 (+) Class in. (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
1⁄4 – 28 or 0.250 – 28 UNF 1A 0.00144 0.00250 1B 0.00188 0.003252A 0.00095 0.00165 2B 0.00124 0.002153A 0.00072 0.00125 3B 0.00092 0.00160
1⁄4 – 32 or 0.250 – 32 UNEF 2A 0.00092 0.00160 2B 0.00121 0.002103A 0.00069 0.00120 3B 0.00089 0.00155
5⁄16 – 18 or 0.3125 – 18 UNC 1A 0.00176 0.00305 1B 0.00223 0.003952A 0.00115 0.00200 2B 0.00153 0.002653A 0.00087 0.00150 3B 0.00113 0.00195
5⁄16 – 20 or 0.3125 – 20 UN 2A 0.00115 0.00200 2B 0.00150 0.002603A 0.00087 0.00150 3B 0.00113 0.00195
5⁄16 – 24 or 0.3125 – 24 UNF 1A 0.00159 0.00275 1B 0.00205 0.003552A 0.00107 0.00185 2B 0.00139 0.002403A 0.00078 0.00135 3B 0.00104 0.00180
5⁄16 – 28 or 0.3125 – 28 UN 2A 0.00098 0.00170 2B 0.00127 0.002203A 0.00075 0.00130 3B 0.00095 0.00165
5⁄16 – 32 or 0.3125 – 32 UNEF 2A 0.00092 0.00160 2B 0.00121 0.002103A 0.00069 0.00120 3B 0.00089 0.00155
3⁄8 – 16 or 0.375 – 16 UNC 1A 0.00188 0.00325 1B 0.00245 0.004252A 0.00127 0.00220 2B 0.00165 0.002853A 0.00095 0.00165 3B 0.00124 0.00215
3⁄8 – 20 or 0.375 – 20 UN 2A 0.00118 0.00205 2B 0.00156 0.002703A 0.00089 0.00155 3B 0.00115 0.00200
3⁄8 – 24 or 0.375 – 24 UNF 1A 0.00165 0.00285 1B 0.00214 0.003702A 0.00110 0.00190 2B 0.00141 0.002453A 0.00084 0.00145 3B 0.00107 0.00185
3⁄8 – 28 or 0.375 – 28 UN 2A 0.00104 0.00180 2B 0.00133 0.002303A 0.00078 0.00135 3B 0.00101 0.00175
3⁄8 – 32 or 0.375 – 32 UNEF 2A 0.00098 0.00170 2B 0.00127 0.002203A 0.00072 0.00125 3B 0.00095 0.00165
7⁄16 – 14 or 0.4375 – 14 UNC 1A 0.00205 0.00355 1B 0.00266 0.004602A 0.00136 0.00235 2B 0.00176 0.003053A 0.00101 0.00175 3B 0.00133 0.00230
7⁄16 – 16 or 0.4375 – 16 UN 2A 0.00133 0.00230 2B 0.00170 0.002953A 0.00098 0.00170 3B 0.00130 0.00225
7⁄16 – 20 or 0.4375 – 20 UNF 1A 0.00182 0.00315 1B 0.00234 0.004052A 0.00121 0.00210 2B 0.00156 0.002703A 0.00089 0.00155 3B 0.00118 0.00205
7⁄16 – 28 or 0.4375 – 28 UNEF 2A 0.00104 0.00180 2B 0.00133 0.002303A 0.00078 0.00135 3B 0.00101 0.00175
7⁄16 – 32 or 0.4375 – 32 UN 2A 0.00098 0.00170 2B 0.00127 0.002203A 0.00072 0.00125 3B 0.00095 0.00165
1⁄2 – 13 or 0.500 – 13 UNC 1A 0.00214 0.00370 1B 0.00280 0.004852A 0.00144 0.00250 2B 0.00188 0.003253A 0.00107 0.00185 3B 0.00139 0.00240
39
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, in. Diameter, in.Threads/in. Designation Class in. (±) 1⁄2Td2 (+) Class (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
1⁄2 – 16 or 0.500 – 16 UN 2A 0.00136 0.00235 2B 0.00176 0.003053A 0.00101 0.00175 3B 0.00133 0.00230
1⁄2 – 20 or 0.500 – 20 UNF 1A 0.00185 0.00320 1B 0.00242 0.004202A 0.00124 0.00215 2B 0.00162 0.002803A 0.00092 0.00160 3B 0.00121 0.00210
1⁄2 – 28 or 0.500 – 28 UNEF 2A 0.00107 0.00185 2B 0.00139 0.002403A 0.00081 0.00140 3B 0.00104 0.00180
1⁄2 – 32 or 0.500 – 32 UN 2A 0.00101 0.00175 2B 0.00130 0.002253A 0.00075 0.00130 3B 0.00098 0.00170
9⁄16 – 12 or 0.5625 – 12 UNC 1A 0.00225 0.00390 1B 0.00294 0.005102A 0.00150 0.00260 2B 0.00196 0.003403A 0.00113 0.00195 3B 0.00147 0.00255
9⁄16 – 16 or 0.5625 – 16 UN 2A 0.00136 0.00235 2B 0.00176 0.003053A 0.00101 0.00175 3B 0.00133 0.00230
9⁄16 – 18 or 0.5625 – 18 UNF 1A 0.00196 0.00340 1B 0.00257 0.004452A 0.00130 0.00225 2B 0.00170 0.002953A 0.00098 0.00170 3B 0.00127 0.00220
9⁄16 – 20 or 0.5625 – 20 UN 2A 0.00121 0.00210 2B 0.00159 0.002753A 0.00092 0.00160 3B 0.00118 0.00205
9⁄16 – 24 or 0.5625 – 24 UNEF 2A 0.00113 0.00195 2B 0.00147 0.002553A 0.00084 0.00145 3B 0.00110 0.00190
9⁄16 – 28 or 0.5625 – 28 UN 2A 0.00107 0.00185 2B 0.00139 0.002403A 0.00081 0.00140 3B 0.00104 0.00180
9⁄16 – 32 or 0.5625 – 32 UN 2A 0.00101 0.00175 2B 0.00130 0.002253A 0.00075 0.00130 3B 0.00098 0.00170
5⁄8 – 11 or 0.625 – 11 UNC 1A 0.00240 0.00415 1B 0.00309 0.005352A 0.00159 0.00275 2B 0.00208 0.003603A 0.00118 0.00205 3B 0.00156 0.00270
5⁄8 – 12 or 0.625 – 12 UN 2A 0.00156 0.00270 2B 0.00205 0.003553A 0.00118 0.00205 3B 0.00153 0.00265
5⁄8 – 16 or 0.625 – 16 UN 2A 0.00139 0.00240 2B 0.00179 0.003103A 0.00104 0.00180 3B 0.00133 0.00230
5⁄8 – 18 or 0.625 – 18 UNF 1A 0.00202 0.00350 1B 0.00263 0.004552A 0.00136 0.00235 2B 0.00173 0.003003A 0.00101 0.00175 3B 0.00130 0.00255
5⁄8 – 20 or 0.625 – 20 UN 2A 0.00124 0.00215 2B 0.00162 0.002803A 0.00092 0.00160 3B 0.00121 0.00210
5⁄8 – 24 or 0.625 – 24 UNEF 2A 0.00115 0.00200 2B 0.00150 0.002603A 0.00087 0.00150 3B 0.00113 0.00195
5⁄8 – 28 or 0.625 – 28 UN 2A 0.00110 0.00190 2B 0.00141 0.002453A 0.00081 0.00140 3B 0.00107 0.00185
5⁄8 – 32 or 0.625 – 32 UN 2A 0.00104 0.00180 2B 0.00133 0.002303A 0.00078 0.00135 3B 0.00101 0.00175
11⁄16 – 12 or 0.6875 – 12 UN 2A 0.00156 0.00270 2B 0.00205 0.003553A 0.00118 0.00205 3B 0.00153 0.00265
40
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, Diameter, in.Threads/in. Designation Class in. (±) 1⁄2Td2 (+) Class in. (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
11⁄16 – 16 or 0.6875 – 16 UN 2A 0.00139 0.00240 2B 0.00179 0.003103A 0.00104 0.00130 3B 0.00133 0.00230
11⁄16 – 20 or 0.6875 – 20 UN 2A 0.00124 0.00215 2B 0.00162 0.002803A 0.00092 0.00160 3B 0.00121 0.00210
11⁄16 – 24 or 0.6875 – 24 UNEF 2A 0.00115 0.00200 2B 0.00150 0.002603A 0.00087 0.00150 3B 0.00113 0.00195
11⁄16 – 28 or 0.6875 – 28 UN 2A 0.00110 0.00190 2B 0.00141 0.002453A 0.00081 0.00140 3B 0.00107 0.00185
11⁄16 – 32 or 0.6875 – 32 UN 2A 0.00104 0.00180 2B 0.00133 0.002303A 0.00078 0.00135 3B 0.00101 0.00175
3⁄4 – 10 or 0.750 – 10 UNC 1A 0.00254 0.00440 1B 0.00332 0.005752A 0.00170 0.00295 2B 0.00222 0.003853A 0.00127 0.00220 3B 0.00165 0.00285
3⁄4 – 12 or 0.750 – 12 UN 2A 0.00159 0.00275 2B 0.00208 0.003603A 0.00118 0.00205 3B 0.00156 0.00270
3⁄4 – 16 or 0.750 – 16 UNF 1A 0.00217 0.00375 1B 0.00283 0.004902A 0.00144 0.00250 2B 0.00188 0.003253A 0.00110 0.00190 3B 0.00141 0.00245
3⁄4 – 20 or 0.750 – 20 UNEF 2A 0.00127 0.00220 2B 0.00165 0.002853A 0.00095 0.00165 3B 0.00124 0.00215
3⁄4 – 28 or 0.750 – 28 UN 2A 0.00110 0.00190 2B 0.00144 0.002503A 0.00084 0.00145 3B 0.00107 0.00185
3⁄4 – 32 or 0.750 – 32 UN 2A 0.00104 0.00180 2B 0.00136 0.002353A 0.00078 0.00135 3B 0.00104 0.00180
13⁄16 – 12 or 0.8125 – 12 UN 2A 0.00159 0.00275 2B 0.00208 0.003603A 0.00118 0.00205 3B 0.00156 0.00270
13⁄16 – 16 or 0.8125 – 16 UN 2A 0.00141 0.00245 2B 0.00182 0.003153A 0.00104 0.00180 3B 0.00136 0.00235
13⁄16 – 20 or 0.8125 – 20 UNEF 2A 0.00127 0.00220 2B 0.00165 0.002853A 0.00095 0.00165 3B 0.00124 0.00215
13⁄16 – 28 or 0.8125 – 28 UN 2A 0.00110 0.00190 2B 0.00144 0.002503A 0.00084 0.00145 3B 0.00107 0.00185
13⁄16 – 32 or 0.8125 – 32 UN 2A 0.00104 0.00180 2B 0.00136 0.002353A 0.00078 0.00135 3B 0.00104 0.00180
7⁄8 – 9 or 0.875 – 9 UNC 1A 0.00274 0.00475 1B 0.00355 0.006152A 0.00182 0.00315 2B 0.00237 0.004103A 0.00136 0.00235 3B 0.00176 0.00305
7⁄8 – 12 or 0.875 – 12 UN 2A 0.00159 0.00275 2B 0.00208 0.003603A 0.00118 0.00205 3B 0.00156 0.00270
7⁄8 – 14 or 0.875 – 14 UNF 1A 0.00234 0.00405 1B 0.00306 0.005302A 0.00156 0.00270 2B 0.00202 0.003503A 0.00118 0.00205 3B 0.00153 0.00265
7⁄8 – 16 or 0.875 – 16 UN 2A 0.00141 0.00245 2B 0.00182 0.003153A 0.00104 0.00180 3B 0.00136 0.00235
41
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, Diameter, in.Threads/in. Designation Class in. (±) 1⁄2Td2 (+) Class in. (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
7⁄8 – 20 or 0.875 – 20 UNEF 2A 0.00127 0.00220 2B 0.00165 0.002853A 0.00095 0.00165 3B 0.00124 0.00215
7⁄8 – 28 or 0.875 – 28 UN 2A 0.00110 0.00190 2B 0.00144 0.002503A 0.00084 0.00145 3B 0.00107 0.00185
7⁄8 – 32 or 0.875 – 32 UN 2A 0.00104 0.00180 2B 0.00136 0.002353A 0.00078 0.00135 3B 0.00104 0.00180
15⁄16 – 12 or 0.9375 – 12 UN 2A 0.00165 0.00255 2B 0.00214 0.003703A 0.00121 0.00210 3B 0.00159 0.00275
15⁄16 – 16 or 0.9375 – 16 UN 2A 0.00144 0.00250 2B 0.00188 0.003253A 0.00107 0.00185 3B 0.00141 0.00245
15⁄16 – 20 or 0.9375 – 20 UNEF 2A 0.00130 0.00225 2B 0.00170 0.002953A 0.00098 0.00170 3B 0.00127 0.00220
15⁄16 – 28 or 0.9375 – 28 UN 2A 0.00115 0.00200 2B 0.00150 0.002603A 0.00087 0.00150 3B 0.00113 0.00195
15⁄16 – 32 or 0.9375 – 32 UN 2A 0.00110 0.00190 2B 0.00141 0.002453A 0.00081 0.00140 3B 0.00107 0.00185
1 – 8 or 1.000 – 8 UNC 1A 0.00292 0.00505 1B 0.00381 0.006602A 0.00196 0.00340 2B 0.00254 0.004403A 0.00147 0.00255 3B 0.00191 0.00330
1 – 12 or 1.000 – 12 UNF 1A 0.00254 0.00440 1B 0.00329 0.005702A 0.00170 0.00295 2B 0.00219 0.003803A 0.00127 0.00220 3B 0.00165 0.00285
1 – 14 or 1.000 – 14 UNS 1A 0.00242 0.00420 1B 0.00315 0.005452A 0.00162 0.00280 2B 0.00211 0.003653A 0.00121 0.00210 3B 0.00156 0.00270
1 – 16 or 1.000 – 16 UN 2A 0.00144 0.00250 2B 0.00188 0.003253A 0.00107 0.00185 3B 0.00141 0.00245
1 – 20 or 1.000 – 20 UNEF 2A 0.00130 0.00225 2B 0.00170 0.002953A 0.00098 0.00170 3B 0.00127 0.00220
1 – 28 or 1.000 – 28 UN 2A 0.00115 0.00200 2B 0.00150 0.002603A 0.00087 0.00150 3B 0.00113 0.00195
1 – 32 or 1.000 – 32 UN 2A 0.00110 0.00190 2B 0.00141 0.002453A 0.00081 0.00140 3B 0.00107 0.00185
11⁄16 – 8 or 1.0625 – 8 UN 2A 0.00196 0.00340 2B 0.00257 0.004453A 0.00147 0.00255 3B 0.00193 0.00335
11⁄16 – 12 or 1.0625 – 12 UN 2A 0.00165 0.00285 2B 0.00214 0.003703A 0.00121 0.00210 3B 0.00159 0.00275
11⁄16 – 16 or 1.0625 – 16 UN 2A 0.00144 0.00250 2B 0.00188 0.003253A 0.00107 0.00185 3B 0.00141 0.00245
11⁄16 – 18 or 1.0625 – 18 UNEF 2A 0.00136 0.00235 2B 0.00179 0.003103A 0.00104 0.00180 3B 0.00133 0.00230
11⁄16 – 20 or 1.0625 – 20 UN 2A 0.00130 0.00225 2B 0.00170 0.002953A 0.00098 0.00170 3B 0.00127 0.00220
42
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, Diameter, in.Threads/in. Designation Class in. (±) 1⁄2Td2 (+) Class in. (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
11⁄16 – 28 or 1.0625 – 28 UN 2A 0.00115 0.00200 2B 0.00150 0.002603A 0.00087 0.00150 3B 0.00113 0.00195
11⁄8 – 7 or 1.125 – 7 UNC 1A 0.00315 0.00545 1B 0.00407 0.007052A 0.00208 0.00360 2B 0.00271 0.004703A 0.00156 0.00270 3B 0.00205 0.00355
11⁄8 – 8 or 1.125 – 8 UN 2A 0.00199 0.00345 2B 0.00260 0.004503A 0.00150 0.00260 3B 0.00193 0.00335
11⁄8 – 12 or 1.125 – 12 UNF 1A 0.00260 0.00450 1B 0.00338 0.005852A 0.00173 0.00300 2B 0.00225 0.003903A 0.00130 0.00225 3B 0.00170 0.00295
11⁄8 – 16 or 1.125 – 16 UN 2A 0.00144 0.00250 2B 0.00188 0.003253A 0.00107 0.00185 3B 0.00141 0.00245
11⁄8 – 18 or 1.125 – 18 UNEF 2A 0.00136 0.00235 2B 0.00179 0.003103A 0.00104 0.00180 3B 0.00133 0.00230
11⁄8 – 20 or 1.125 – 20 UN 2A 0.00130 0.00225 2B 0.00170 0.002953A 0.00098 0.00170 3B 0.00127 0.00220
11⁄8 – 28 or 1.125 – 28 UN 2A 0.00115 0.00200 2B 0.00150 0.002603A 0.00087 0.00150 3B 0.00113 0.00195
13⁄16 – 8 or 1.1875 – 8 UN 2A 0.00202 0.00350 2B 0.00263 0.004553A 0.00150 0.00260 3B 0.00196 0.00340
13⁄16 – 12 or 1.1875 – 12 UN 2A 0.00167 0.00290 2B 0.00217 0.003753A 0.00124 0.00215 3B 0.00162 0.00280
13⁄16 – 16 or 1.1875 – 16 UN 2A 0.00147 0.00255 2B 0.00191 0.003303A 0.00110 0.00190 3B 0.00144 0.00250
13⁄16 – 18 or 1.1875 – 18 UNEF 2A 0.00141 0.00245 2B 0.00182 0.003153A 0.00104 0.00180 3B 0.00136 0.00235
13⁄16 – 20 or 1.1875 – 20 UN 2A 0.00136 0.00235 2B 0.00176 0.003053A 0.00101 0.00175 3B 0.00130 0.00225
13⁄16 – 28 or 1.1875 – 28 UN 2A 0.00118 0.00205 2B 0.00153 0.002653A 0.00089 0.00155 3B 0.00115 0.00200
11⁄4 – 7 or 1.250 – 7 UNC 1A 0.00320 0.00555 1B 0.00416 0.007202A 0.00214 0.00370 2B 0.00277 0.004803A 0.00159 0.00275 3B 0.00208 0.00360
11⁄4 – 8 or 1.250 – 8 UN 2A 0.00202 0.00350 2B 0.00266 0.004603A 0.00153 0.00265 3B 0.00199 0.00345
11⁄4 – 12 or 1.250 – 12 UNF 1A 0.00266 0.00460 1B 0.00346 0.006002A 0.00179 0.00310 2B 0.00231 0.004003A 0.00133 0.00230 3B 0.00173 0.00300
11⁄4 – 16 or 1.250 – 16 UN 2A 0.00147 0.00255 2B 0.00191 0.003303A 0.00100 0.00190 3B 0.00144 0.00250
11⁄4 – 18 or 1.250 – 18 UNEF 2A 0.00141 0.00245 2B 0.00182 0.003153A 0.00104 0.00180 3B 0.00136 0.00235
11⁄4 – 20 or 1.250 – 20 UN 2A 0.00136 0.00235 2B 0.00176 0.003053A 0.00101 0.00175 3B 0.00130 0.00225
43
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, Diameter, in.Threads/in. Designation Class in. (±) 1⁄2Td2 (+) Class in. (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
11⁄4 – 28 or 1.250 – 28 UN 2A 0.00118 0.00205 2B 0.00153 0.002653A 0.00089 0.00155 3B 0.00115 0.00200
15⁄16 – 8 or 1.3125 – 8 UN 2A 0.00205 0.00355 2B 0.00266 0.004603A 0.00153 0.00265 3B 0.00199 0.00345
15⁄16 – 12 or 1.3125 – 12 UN 2A 0.00167 0.00290 2B 0.00217 0.003753A 0.00124 0.00215 3B 0.00162 0.00280
15⁄16 – 16 or 1.3125 – 16 UN 2A 0.00147 0.00255 2B 0.00191 0.003303A 0.00110 0.00190 3B 0.00144 0.00250
15⁄16 – 18 or 1.3125 – 18 UNEF 2A 0.00141 0.00245 2B 0.00182 0.003153A 0.00104 0.00180 3B 0.00136 0.00235
15⁄16 – 20 or 1.3125 – 20 UN 2A 0.00136 0.00235 2B 0.00176 0.003053A 0.00101 0.00175 3B 0.00130 0.00225
15⁄16 – 28 or 1.3125 – 28 UN 2A 0.00118 0.00205 2B 0.00153 0.002653A 0.00089 0.00155 3B 0.00115 0.00200
13⁄8 – 6 or 1.375 – 6 UNC 1A 0.00346 0.00600 1B 0.00447 0.007752A 0.00231 0.00400 2B 0.00300 0.005203A 0.00173 0.00300 3B 0.00225 0.00390
13⁄8 – 8 or 1.375 – 8 UN 2A 0.00208 0.00360 2B 0.00268 0.004653A 0.00156 0.00270 3B 0.00202 0.00350
13⁄8 – 12 or 1.375 – 12 UNF 1A 0.00271 0.00470 1B 0.00355 0.006152A 0.00182 0.00315 2B 0.00237 0.004103A 0.00136 0.00235 3B 0.00176 0.00305
13⁄8 – 16 or 1.375 – 16 UN 2A 0.00147 0.00255 2B 0.00191 0.003303A 0.00110 0.00190 3B 0.00144 0.00250
13⁄8 – 18 or 1.375 – 18 UNEF 2A 0.00141 0.00245 2B 0.00182 0.003153A 0.00104 0.00180 3B 0.00136 0.00235
13⁄8 – 20 or 1.375 – 20 UN 2A 0.00136 0.00235 2B 0.00176 0.003053A 0.00101 0.00175 3B 0.00130 0.00225
13⁄8 – 28 or 1.375 – 28 UN 2A 0.00118 0.00205 2B 0.00153 0.002653A 0.00089 0.00155 3B 0.00115 0.00200
17⁄16 – 6 or 1.4375 – 6 UN 2A 0.00231 0.00400 2B 0.00300 0.005203A 0.00173 0.00300 3B 0.00225 0.00390
17⁄16 – 8 or 1.4375 – 8 UN 2A 0.00208 0.00360 2B 0.00271 0.004703A 0.00156 0.00270 3B 0.00205 0.00355
17⁄16 – 12 or 1.4375 – 12 UN 2A 0.00170 0.00295 2B 0.00219 0.003803A 0.00127 0.00220 3B 0.00165 0.00285
17⁄16 – 16 or 1.4375 – 16 UN 2A 0.00150 0.00260 2B 0.00196 0.003403A 0.00113 0.00195 3B 0.00147 0.00255
17⁄16 – 18 or 1.4375 – 18 UNEF 2A 0.00144 0.00250 2B 0.00188 0.003253A 0.00107 0.00185 3B 0.00139 0.00240
17⁄16 – 20 or 1.4375 – 20 UN 2A 0.00139 0.00240 2B 0.00179 0.003103A 0.00104 0.00180 3B 0.00133 0.00230
17⁄16 – 28 or 1.4375 – 28 UN 2A 0.00121 0.00210 2B 0.00159 0.002753A 0.00089 0.00155 3B 0.00118 0.00205
44
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, Diameter, in.Threads/in. Designation Class in. (±) 1⁄2Td2 (+) Class in. (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
11⁄2 – 6 or 1.500 – 6 UNC 1A 0.00349 0.00605 1B 0.00456 0.007902A 0.00234 0.00405 2B 0.00303 0.005253A 0.00176 0.00305 3B 0.00228 0.00305
11⁄2 – 8 or 1.500 – 8 UN 2A 0.00211 0.00365 2B 0.00274 0.004753A 0.00159 0.00275 3B 0.00205 0.00355
11⁄2 – 12 or 1.500 – 12 UNF 1A 0.00277 0.00480 1B 0.00361 0.006252A 0.00185 0.00320 2B 0.00240 0.004153A 0.00139 0.00240 3B 0.00182 0.00315
11⁄2 – 16 or 1.500 – 16 UN 2A 0.00150 0.00260 2B 0.00196 0.003403A 0.00113 0.00195 3B 0.00147 0.00255
11⁄2 – 18 or 1.500 – 18 UNEF 2A 0.00144 0.00250 2B 0.00188 0.003253A 0.00107 0.00185 3B 0.00139 0.00240
11⁄2 – 20 or 1.500 – 20 UN 2A 0.00139 0.00240 2B 0.00179 0.003103A 0.00104 0.00180 3B 0.00133 0.00230
11⁄2 – 28 or 1.500 – 28 UN 2A 0.00121 0.00210 2B 0.00159 0.002753A 0.00089 0.00155 3B 0.00118 0.00205
19⁄16 – 6 or 1.5625 – 6 UN 2A 0.00237 0.00410 2B 0.00306 0.005303A 0.00176 0.00305 3B 0.00231 0.00400
19⁄16 – 8 or 1.5625 – 8 UN 2A 0.00214 0.00370 2B 0.00277 0.004803A 0.00159 0.00275 3B 0.00208 0.00360
19⁄16 – 12 or 1.5625 – 12 UN 2A 0.00170 0.00295 2B 0.00219 0.003803A 0.00127 0.00220 3B 0.00165 0.00285
19⁄16 – 16 or 1.5625 – 16 UN 2A 0.00150 0.00260 2B 0.00196 0.003403A 0.00113 0.00195 3B 0.00147 0.00255
19⁄16 – 18 or 1.5625 – 18 UNEF 2A 0.00144 0.00250 2B 0.00188 0.003253A 0.00107 0.00185 3B 0.00139 0.00240
19⁄16 – 20 or 1.5625 – 20 UN 2A 0.00139 0.00240 2B 0.00179 0.003103A 0.00104 0.00180 3B 0.00133 0.00230
15⁄8 – 6 or 1.625 – 6 UN 2A 0.00237 0.00410 2B 0.00309 0.005353A 0.00179 0.00310 3B 0.00231 0.00400
15⁄8 – 8 or 1.625 – 8 UN 2A 0.00214 0.00370 2B 0.00280 0.004853A 0.00162 0.00280 3B 0.00208 0.00360
15⁄8 – 12 or 1.625 – 12 UN 2A 0.00170 0.00295 2B 0.00219 0.003803A 0.00127 0.00220 3B 0.00165 0.00285
15⁄8 – 16 or 1.625 – 16 UN 2A 0.00150 0.00260 2B 0.00196 0.003403A 0.00113 0.00195 3B 0.00147 0.00255
15⁄8 – 18 or 1.625 – 18 UNEF 2A 0.00144 0.00250 2B 0.00188 0.003253A 0.00107 0.00185 3B 0.00130 0.00240
15⁄8 – 20 or 1.625 – 20 UN 2A 0.00139 0.00240 2B 0.00179 0.003103A 0.00104 0.00180 3B 0.00133 0.00230
111⁄16 – 6 or 1.6875 – 6 UN 2A 0.00240 0.00415 2B 0.00312 0.005403A 0.00179 0.00310 3B 0.00234 0.00405
111⁄16 – 8 or 1.6875 – 8 UN 2A 0.00217 0.00375 2B 0.00280 0.004853A 0.00162 0.00280 3B 0.00211 0.00365
45
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, Diameter, in.Threads/in. Designation Class in. (±) 1⁄2Td2 (+) Class in. (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
111⁄16 – 12 or 1.6875 – 12 UN 2A 0.00173 0.00300 2B 0.00225 0.003903A 0.00130 0.00225 3B 0.00167 0.00290
111⁄16 – 16 or 1.6875 – 16 UN 2A 0.00153 0.00265 2B 0.00199 0.003453A 0.00115 0.00200 3B 0.00150 0.00260
111⁄16 – 18 or 1.6875 – 18 UNEF 2A 0.00147 0.00255 2B 0.00191 0.003303A 0.00110 0.00190 3B 0.00141 0.00245
111⁄16 – 20 or 1.6875 – 20 UN 2A 0.00139 0.00240 2B 0.00182 0.003153A 0.00104 0.00180 3B 0.00136 0.00235
13⁄4 – 5 or 1.750 – 5 UNC 1A 0.00387 0.00670 1B 0.00502 0.008702A 0.00257 0.00445 2B 0.00335 0.005803A 0.00193 0.00335 3B 0.00251 0.00435
13⁄4 – 6 or 1.750 – 6 UN 2A 0.00240 0.00415 2B 0.00312 0.005403A 0.00182 0.00315 3B 0.00234 0.00405
13⁄4 – 8 or 1.750 – 8 UN 2A 0.00217 0.00375 2B 0.00283 0.004903A 0.00165 0.00285 3B 0.00214 0.00370
13⁄4 – 12 or 1.750 – 12 UN 2A 0.00173 0.00300 2B 0.00225 0.003903A 0.00130 0.00225 3B 0.00167 0.00290
13⁄4 – 16 or 1.750 – 16 UN 2A 0.00153 0.00265 2B 0.00199 0.003453A 0.00115 0.00200 3B 0.00150 0.00260
13⁄4 – 20 or 1.750 – 20 UN 2A 0.00139 0.00240 2B 0.00182 0.003153A 0.00104 0.00180 3B 0.00136 0.00235
113⁄16 – 6 or 1.8125 – 6 UN 2A 0.00242 0.00420 2B 0.00315 0.005453A 0.00182 0.00315 3B 0.00237 0.00410
113⁄16 – 8 or 1.8125 – 8 UN 2A 0.00219 0.00380 2B 0.00286 0.004953A 0.00165 0.00285 3B 0.00214 0.00370
113⁄16 – 12 or 1.8125 – 12 UN 2A 0.00173 0.00300 2B 0.00225 0.003903A 0.00130 0.00225 3B 0.00167 0.00290
113⁄16 – 16 or 1.8125 – 16 UN 2A 0.00153 0.00265 2B 0.00199 0.003453A 0.00115 0.00200 3B 0.00150 0.00260
113⁄16 – 20 or 1.8125 – 20 UN 2A 0.00139 0.00240 2B 0.00182 0.003153A 0.00104 0.00180 3B 0.00136 0.00235
17⁄8 – 6 or 1.875 – 6 UN 2A 0.00242 0.00420 2B 0.00318 0.005503A 0.00182 0.00315 3B 0.00237 0.00410
17⁄8 – 8 or 1.875 – 8 UN 2A 0.00222 0.00385 2B 0.00289 0.005003A 0.00165 0.00285 3B 0.00217 0.00375
17⁄8 – 12 or 1.875 – 12 UN 2A 0.00173 0.00300 2B 0.00225 0.003903A 0.00130 0.00225 3B 0.00167 0.00290
17⁄8 – 16 or 1.875 – 16 UN 2A 0.00153 0.00265 2B 0.00199 0.003453A 0.00115 0.00200 3B 0.00150 0.00260
17⁄8 – 20 or 1.875 – 20 UN 2A 0.00139 0.00240 2B 0.00182 0.003153A 0.00104 0.00180 3B 0.00136 0.00235
115⁄16 – 6 or 1.9375 – 6 UN 2A 0.00245 0.00425 2B 0.00320 0.005553A 0.00185 0.00320 3B 0.00240 0.00415
46
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, Diameter, in.Threads/in. Designation Class in. (±) 1⁄2Td2 (+) Class in. (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
115⁄16 – 8 or 1.9375 – 8 UN 2A 0.00222 0.00385 2B 0.00289 0.005003A 0.00167 0.00290 3B 0.00217 0.00375
115⁄16 – 12 or 1.9375 – 12 UN 2A 0.00176 0.00305 2B 0.00228 0.003953A 0.00130 0.00225 3B 0.00170 0.00295
115⁄16 – 16 or 1.9375 – 16 UN 2A 0.00156 0.00270 2B 0.00202 0.003503A 0.00115 0.00200 3B 0.00150 0.00260
115⁄16 – 20 or 1.9375 – 20 UN 2A 0.00141 0.00245 2B 0.00185 0.003203A 0.00107 0.00185 3B 0.00139 0.00240
2 – 41⁄2 or 2.000 – 4.5 UNC 1A 0.00413 0.00715 1B 0.00537 0.009302A 0.00274 0.00475 2B 0.00358 0.006203A 0.00205 0.00355 3B 0.00268 0.00465
2 – 6 or 2.000 – 6 UN 2A 0.00248 0.00430 2B 0.00320 0.005553A 0.00185 0.00320 3B 0.00240 0.00415
2 – 8 or 2.000 – 8 UN 2A 0.00225 0.00390 2B 0.00292 0.005053A 0.00167 0.00290 3B 0.00219 0.00380
2 – 12 or 2.000 – 12 UN 2A 0.00176 0.00305 2B 0.00223 0.003953A 0.00130 0.00225 3B 0.00170 0.00295
2 – 16 or 2.000 – 16 UN 2A 0.00156 0.00270 2B 0.00202 0.003503A 0.00115 0.00200 3B 0.00150 0.00260
2 – 20 or 2.000 – 20 UN 2A 0.00141 0.00245 2B 0.00185 0.003203A 0.00107 0.00185 3B 0.00139 0.00240
21⁄8 – 6 or 2.125 – 6 UN 2A 0.00251 0.00435 2B 0.00326 0.005653A 0.00188 0.00325 3B 0.00242 0.00420
21⁄8 – 8 or 2.125 – 8 UN 2A 0.00228 0.00395 2B 0.00294 0.005103A 0.00170 0.00295 3B 0.00212 0.00385
21⁄8 – 12 or 2.125 – 12 UN 2A 0.00176 0.00305 2B 0.00228 0.003953A 0.00130 0.00225 3B 0.00170 0.00295
21⁄8 – 16 or 2.125 – 16 UN 2A 0.00156 0.00270 2B 0.00202 0.003503A 0.00115 0.00200 3B 0.00150 0.00260
21⁄8 – 20 or 2.125 – 20 UN 2A 0.00141 0.00245 2B 0.00185 0.003203A 0.00107 0.00185 3B 0.00139 0.00240
21⁄4 – 41⁄2 or 2.250 – 4.5 UNC 1A 0.00421 0.00730 1B 0.00548 0.009502A 0.00280 0.00485 2B 0.00364 0.006303A 0.00211 0.00365 3B 0.00274 0.00475
21⁄4 – 6 or 2.250 – 6 UN 2A 0.00254 0.00440 2B 0.00329 0.005703A 0.00191 0.00330 3B 0.00214 0.00425
21⁄4 – 8 or 2.250 – 8 UN 2A 0.00231 0.00400 2B 0.00300 0.005203A 0.00173 0.00300 3B 0.00225 0.00390
21⁄4 – 12 or 2.250 – 12 UN 2A 0.00176 0.00305 2B 0.00228 0.003953A 0.00130 0.00225 3B 0.00170 0.00295
21⁄4 – 16 or 2.250 – 16 UN 2A 0.00156 0.00270 2B 0.00202 0.003503A 0.00115 0.00200 3B 0.00150 0.00260
21⁄4 – 20 or 2.250 – 20 UN 2A 0.00141 0.00245 2B 0.00185 0.003203A 0.00107 0.00185 3B 0.00139 0.00240
47
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, Diameter, in.Threads/in. Designation Class in. (±) 1⁄2Td2 (+) Class in. (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
23⁄8 – 6 or 2.375 – 6 UN 2A 0.00257 0.00445 2B 0.00332 0.005753A 0.00191 0.00330 3B 0.00248 0.00430
23⁄8 – 8 or 2.375 – 8 UN 2A 0.00234 0.00405 2B 0.00303 0.005253A 0.00173 0.00300 3B 0.00228 0.00395
23⁄8 – 12 or 2.375 – 12 UN 2A 0.00179 0.00310 2B 0.00234 0.004053A 0.00133 0.00230 3B 0.00173 0.00300
23⁄8 – 16 or 2.375 – 16 UN 2A 0.00159 0.00275 2B 0.00208 0.003603A 0.00118 0.00205 3B 0.00155 0.00270
23⁄8 – 20 or 2.375 – 20 UN 2A 0.00147 0.00255 2B 0.00191 0.003303A 0.00110 0.00190 3B 0.00144 0.00250
21⁄2 – 4 or 2.500 – 4 UNC 1A 0.00447 0.00775 1B 0.00583 0.010102A 0.00300 0.00520 2B 0.00390 0.006753A 0.00225 0.00390 3B 0.00292 0.00505
21⁄2 – 6 or 2.500 – 6 UN 2A 0.00260 0.00450 2B 0.00335 0.005803A 0.00193 0.00335 3B 0.00251 0.00435
21⁄2 – 8 or 2.500 – 8 UN 2A 0.00237 0.00410 2B 0.00306 0.005303A 0.00176 0.00305 3B 0.00231 0.00400
21⁄2 – 12 or 2.500 – 12 UN 2A 0.00179 0.00310 2B 0.00234 0.004053A 0.00133 0.00230 3B 0.00173 0.00300
21⁄2 – 16 or 2.500 – 16 UN 2A 0.00159 0.00275 2B 0.00208 0.003603A 0.00118 0.00205 3B 0.00156 0.00270
21⁄2 – 20 or 2.500 – 20 UN 2A 0.00147 0.00255 2B 0.00191 0.003303A 0.00110 0.00190 3B 0.00144 0.00250
25⁄8 – 6 or 2.625 – 6 UN 2A 0.00260 0.00450 2B 0.00341 0.005903A 0.00196 0.00340 3B 0.00254 0.00440
25⁄8 – 8 or 2.625 – 8 UN 2A 0.00237 0.00410 2B 0.00309 0.005353A 0.00179 0.00310 3B 0.00231 0.00400
25⁄8 – 12 or 2.625 – 12 UN 2A 0.00179 0.00310 2B 0.00234 0.004053A 0.00133 0.00230 3B 0.00173 0.00300
25⁄8 – 16 or 2.625 – 16 UN 2A 0.00159 0.00275 2B 0.00208 0.003603A 0.00118 0.00205 3B 0.00156 0.00270
25⁄8 – 20 or 2.625 – 20 UN 2A 0.00147 0.00255 2B 0.00191 0.003303A 0.00110 0.00190 3B 0.00144 0.00250
23⁄4 – 4 or 2.750 – 4 UNC 1A 0.00456 0.00790 1B 0.00595 0.010302A 0.00303 0.00525 2B 0.00395 0.006853A 0.00228 0.00395 3B 0.00297 0.00515
23⁄4 – 6 or 2.750 – 6 UN 2A 0.00263 0.00455 2B 0.00344 0.005953A 0.00196 0.00340 3B 0.00257 0.00445
23⁄4 – 8 or 2.750 – 8 UN 2A 0.00240 0.00415 2B 0.00312 0.005403A 0.00182 0.00315 3B 0.00234 0.00405
23⁄4 – 12 or 2.750 – 12 UN 2A 0.00179 0.00310 2B 0.00234 0.004053A 0.00133 0.00230 3B 0.00173 0.00300
48
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, Diameter, in.Threads/in. Designation Class in. (±) 1⁄2Td2(+) Class in. (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
23⁄4 – 16 or 2.750 – 16 UN 2A 0.00159 0.00275 2B 0.00208 0.003603A 0.00118 0.00205 3B 0.00156 0.00270
23⁄4 – 20 or 2.750 – 20 UN 2A 0.00147 0.00255 2B 0.00191 0.003303A 0.00110 0.00190 3B 0.00144 0.00250
27⁄8 – 6 or 2.875 – 6 UN 2A 0.00266 0.00460 2B 0.00346 0.006003A 0.00199 0.00345 3B 0.00280 0.00450
27⁄8 – 8 or 2.875 – 8 UN 2A 0.00242 0.00420 2B 0.00318 0.005503A 0.00182 0.00315 3B 0.00237 0.00410
27⁄8 – 12 or 2.875 – 12 UN 2A 0.00182 0.00315 2B 0.00237 0.004103A 0.00136 0.00235 3B 0.00179 0.00310
27⁄8 – 16 or 2.875 – 16 UN 2A 0.00162 0.00280 2B 0.00211 0.003653A 0.00121 0.00210 3B 0.00159 0.00275
27⁄8 – 20 or 2.875 – 20 UN 2A 0.00150 0.00260 2B 0.00196 0.003403A 0.00113 0.00195 3B 0.00147 0.00255
3 – 4 or 3.000 – 4 UNC 1A 0.00465 0.00805 1B 0.00603 0.010452A 0.00309 0.00535 2B 0.00401 0.006953A 0.00231 0.00400 3B 0.00300 0.00520
3 – 6 or 3.000 – 6 UN 2A 0.00268 0.00465 2B 0.00349 0.006053A 0.00202 0.00350 3B 0.00263 0.00455
3 – 8 or 3.000 – 8 UN 2A 0.00245 0.00425 2B 0.00320 0.005553A 0.00185 0.00320 3B 0.00240 0.00415
3 – 12 or 3.000 – 12 UN 2A 0.00182 0.00315 2B 0.00237 0.004103A 0.00136 0.00235 3B 0.00179 0.00310
3 – 16 or 3.000 – 16 UN 2A 0.00162 0.00280 2B 0.00211 0.003653A 0.00121 0.00210 3B 0.00159 0.00275
3 – 20 or 3.000 – 20 UN 2A 0.00150 0.00260 2B 0.00196 0.003403A 0.00113 0.00195 3B 0.00147 0.00255
31⁄8 – 6 or 3.125 – 6 UN 2A 0.00271 0.00470 2B 0.00352 0.006103A 0.00202 0.00350 3B 0.00266 0.00460
31⁄8 – 8 or 3.125 – 8 UN 2A 0.00248 0.00430 2B 0.00323 0.005603A 0.00185 0.00320 3B 0.00242 0.00420
31⁄8 – 12 or 3.125 – 12 UN 2A 0.00182 0.00315 2B 0.00237 0.004103A 0.00136 0.00235 3B 0.00179 0.00310
31⁄8 – 16 or 3.125 – 16 UN 2A 0.00162 0.00280 2B 0.00211 0.003653A 0.00121 0.00210 3B 0.00159 0.00275
31⁄4 – 4 or 3.250 – 4 UNC 1A 0.00471 0.00815 1B 0.00612 0.010602A 0.00315 0.00545 2B 0.00407 0.007053A 0.00237 0.00410 3B 0.00306 0.00530
31⁄4 – 6 or 3.250 – 6 UN 2A 0.00274 0.00475 2B 0.00355 0.006153A 0.00205 0.00355 3B 0.00266 0.00460
31⁄4 – 8 or 3.250 – 8 UN 2A 0.00251 0.00435 2B 0.00326 0.005653A 0.00188 0.00325 3B 0.00245 0.00425
31⁄4 – 12 or 3.250 – 12 UN 2A 0.00182 0.00315 2B 0.00237 0.004103A 0.00136 0.00235 3B 0.00179 0.00310
49
标准下载网(www.bzxzw.com)
ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, Diameter, in.Threads/in. Designation Class in. (±) 1⁄2Td2 (+) Class in. (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
31⁄4 – 16 or 3.250 – 16 UN 2A 0.00162 0.00280 2B 0.00211 0.003653A 0.00121 0.00210 3B 0.00159 0.00275
33⁄8 – 6 or 3.375 – 6 UN 2A 0.00274 0.00475 2B 0.00358 0.006203A 0.00208 0.00360 3B 0.00258 0.00465
33⁄8 – 8 or 3.375 – 8 UN 2A 0.00254 0.00440 2B 0.00329 0.005703A 0.00191 0.00330 3B 0.00245 0.00425
33⁄8 – 12 or 3.375 – 12 UN 2A 0.00185 0.00320 2B 0.00242 0.004203A 0.00139 0.00242 3B 0.00182 0.00315
33⁄8 – 16 or 3.375 – 16 UN 2A 0.00167 0.00290 2B 0.00217 0.003753A 0.00124 0.00215 3B 0.00162 0.00280
31⁄2 – 4 or 3.500 – 4 UNC 1A 0.00479 0.00830 1B 0.00621 0.010752A 0.00318 0.00550 2B 0.00413 0.007153A 0.00240 0.00415 3B 0.00312 0.00540
31⁄2 – 6 or 3.500 – 6 UN 2A 0.00277 0.00480 2B 0.00361 0.006253A 0.00208 0.00360 3B 0.00271 0.00470
31⁄2 – 8 or 3.500 – 8 UN 2A 0.00254 0.00440 2B 0.00332 0.005753A 0.00191 0.00330 3B 0.00248 0.00430
31⁄2 – 12 or 3.500 – 12 UN 2A 0.00185 0.00320 2B 0.00242 0.004203A 0.00139 0.00240 3B 0.00182 0.00315
31⁄2 – 16 or 3.500 – 16 UN 2A 0.00167 0.00290 2B 0.00217 0.003753A 0.00124 0.00215 3B 0.00162 0.00280
35⁄8 – 6 or 3.625 – 6 UN 2A 0.00280 0.00485 2B 0.00364 0.006303A 0.00211 0.00365 3B 0.00274 0.00475
35⁄8 – 8 or 3.625 – 8 UN 2A 0.00257 0.00445 2B 0.00335 0.005803A 0.00193 0.00335 3B 0.00251 0.00435
35⁄8 – 12 or 3.625 – 12 UN 2A 0.00185 0.00320 2B 0.00242 0.004203A 0.00139 0.00240 3B 0.00182 0.00315
35⁄8 – 16 or 3.625 – 16 UN 2A 0.00167 0.00290 2B 0.00217 0.003753A 0.00214 0.00215 3B 0.00162 0.00280
33⁄4 – 4 or 3.750 – 4 UNC 1A 0.00485 0.00840 1B 0.00629 0.010902A 0.00323 0.00560 2B 0.00419 0.007253A 0.00242 0.00420 3B 0.00315 0.00545
33⁄4 – 6 or 3.750 – 6 UN 2A 0.00283 0.00490 2B 0.00367 0.006353A 0.00211 0.00365 3B 0.00274 0.00475
33⁄4 – 8 or 3.750 – 8 UN 2A 0.00260 0.00450 2B 0.00338 0.005853A 0.00193 0.00335 3B 0.00254 0.00440
33⁄4 – 12 or 3.750 – 12 UN 2A 0.00185 0.00320 2B 0.00242 0.004203A 0.00139 0.00240 3B 0.00182 0.00315
33⁄4 – 16 or 3.750 – 16 UN 2A 0.00167 0.00290 2B 0.00217 0.003753A 0.00124 0.00215 3B 0.00162 0.00280
37⁄8 – 6 or 3.875 – 6 UN 2A 0.00286 0.00495 2B 0.00369 0.006403A 0.00214 0.00370 3B 0.00277 0.00480
50
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, Diameter, in.Threads/in. Designation Class in. (±) 1⁄2Td2 (+) Class in. (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
37⁄8 – 8 or 3.875 – 8 UN 2A 0.00263 0.00455 2B 0.00341 0.005903A 0.00196 0.00340 3B 0.00254 0.00440
37⁄8 – 12 or 3.875 – 12 UN 2A 0.00188 0.00325 2B 0.00245 0.004253A 0.00141 0.00245 3B 0.00185 0.00320
37⁄8 – 16 or 3.875 – 16 UN 2A 0.00170 0.00295 2B 0.00219 0.003803A 0.00127 0.00220 3B 0.00165 0.00285
4 – 4 or 4.000 – 4 UNC 1A 0.00491 0.00850 1B 0.00638 0.011052A 0.00326 0.00565 2B 0.00424 0.007353A 0.00245 0.00425 3B 0.00320 0.00555
4 – 6 or 4.000 – 6 UN 2A 0.00286 0.00495 2B 0.00372 0.006453A 0.00214 0.00370 3B 0.00280 0.00485
4 – 8 or 4.000 – 8 UN 2A 0.00263 0.00455 2B 0.00344 0.005953A 0.00196 0.00340 3B 0.00257 0.00445
4 – 12 or 4.000 – 12 UN 2A 0.00188 0.00325 2B 0.00245 0.004253A 0.00141 0.00245 3B 0.00185 0.00320
4 – 16 or 4.000 – 16 UN 2A 0.00170 0.00295 2B 0.00219 0.003803A 0.00127 0.00220 3B 0.00165 0.00285
41⁄8 – 6 or 4.125 – 6 UN 2A 0.00289 0.00500 2B 0.00375 0.006503A 0.00217 0.00375 3B 0.00280 0.00485
41⁄8 – 8 or 4.125 – 8 UN 2A 0.00266 0.00460 2B 0.00346 0.006003A 0.00199 0.00345 3B 0.00260 0.00450
41⁄8 – 12 or 4.125 – 12 UN 2A 0.00188 0.00325 2B 0.00245 0.004253A 0.00141 0.00245 3B 0.00185 0.00320
41⁄8 – 16 or 4.125 – 16 UN 2A 0.00170 0.00295 2B 0.00219 0.003803A 0.00127 0.00220 3B 0.00165 0.00285
41⁄4 – 4 or 4.250 – 4 UN 2A 0.00332 0.00575 2B 0.00430 0.007453A 0.00248 0.00430 3B 0.00323 0.00560
41⁄4 – 6 or 4.250 – 6 UN 2A 0.00292 0.00505 2B 0.00378 0.006553A 0.00217 0.00375 3B 0.00283 0.00490
41⁄4 – 8 or 4.250 – 8 UN 2A 0.00268 0.00465 2B 0.00346 0.006003A 0.00202 0.00350 3B 0.00263 0.00455
41⁄4 – 12 or 4.250 – 12 UN 2A 0.00188 0.00325 2B 0.00245 0.004253A 0.00141 0.00245 3B 0.00185 0.00320
41⁄4 – 16 or 4.250 – 16 UN 2A 0.00170 0.00295 2B 0.00219 0.003803A 0.00127 0.00220 3B 0.00165 0.00285
43⁄8 – 6 or 4.375 – 6 UN 2A 0.00292 0.00505 2B 0.00381 0.006603A 0.00219 0.00380 3B 0.00286 0.00495
43⁄8 – 8 or 4.375 – 8 UN 2A 0.00268 0.00465 2B 0.00346 0.006003A 0.00202 0.00350 3B 0.00263 0.00455
43⁄8 – 12 or 4.375 – 12 UN 2A 0.00188 0.00325 2B 0.00245 0.004253A 0.00141 0.00245 3B 0.00185 0.00320
43⁄8 – 16 or 4.375 – 16 UN 2A 0.00170 0.00295 2B 0.00219 0.003803A 0.00127 0.00220 3B 0.00165 0.00285
51
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, Diameter, in.Threads/in. Designation Class in. (±) 1⁄2Td2 (+) Class in. (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
41⁄2 – 4 or 4.500 – 4 UN 2A 0.00335 0.00580 2B 0.00436 0.007553A 0.00251 0.00435 3B 0.00326 0.00565
41⁄2 – 6 or 4.500 – 6 UN 2A 0.00294 0.00510 2B 0.00384 0.006653A 0.00222 0.00385 3B 0.00286 0.00495
41⁄2 – 8 or 4.500 – 8 UN 2A 0.00271 0.00470 2B 0.00352 0.006103A 0.00205 0.00355 3B 0.00266 0.00460
41⁄2 – 12 or 4.500 – 12 UN 2A 0.00188 0.00325 2B 0.00245 0.004253A 0.00141 0.00245 3B 0.00185 0.00320
41⁄2 – 16 or 4.500 – 16 UN 2A 0.00170 0.00295 2B 0.00219 0.003803A 0.00127 0.00220 3B 0.00165 0.00285
45⁄8 – 6 or 4.625 – 6 UN 2A 0.00297 0.00515 2B 0.00384 0.006653A 0.00222 0.00385 3B 0.00289 0.00500
45⁄8 – 8 or 4.625 – 8 UN 2A 0.00274 0.00475 2B 0.00358 0.006203A 0.00205 0.00355 3B 0.00268 0.00465
45⁄8 – 12 or 4.625 – 12 UN 2A 0.00193 0.00335 2B 0.00251 0.004353A 0.00144 0.00250 3B 0.00191 0.00330
45⁄8 – 16 or 4.625 – 16 UN 2A 0.00176 0.00305 2B 0.00228 0.003953A 0.00130 0.00225 3B 0.00170 0.00295
43⁄4 – 4 or 4.750 – 4 UN 2A 0.00338 0.00585 2B 0.00442 0.007653A 0.00254 0.00440 3B 0.00329 0.00570
43⁄4 – 6 or 4.750 – 6 UN 2A 0.00297 0.00515 2B 0.00387 0.006703A 0.00222 0.00385 3B 0.00292 0.00505
43⁄4 – 8 or 4.750 – 8 UN 2A 0.00274 0.00475 2B 0.00358 0.006203A 0.00205 0.00355 3B 0.00268 0.00465
43⁄4 – 12 or 4.750 – 12 UN 2A 0.00193 0.00335 2B 0.00251 0.004353A 0.00144 0.00250 3B 0.00191 0.00330
43⁄4 – 16 or 4.750 – 16 UN 2A 0.00176 0.00305 2B 0.00228 0.003953A 0.00130 0.00225 3B 0.00170 0.00295
47⁄8 – 6 or 4.875 – 6 UN 2A 0.00300 0.00520 2B 0.00390 0.006753A 0.00225 0.00390 3B 0.00292 0.00505
47⁄8 – 8 or 4.875 – 8 UN 2A 0.00277 0.00480 2B 0.00361 0.006253A 0.00208 0.00360 3B 0.00271 0.00470
47⁄8 – 12 or 4.875 – 12 UN 2A 0.00193 0.00335 2B 0.00251 0.004353A 0.00144 0.00250 3B 0.00101 0.00330
47⁄8 – 16 or 4.875 – 16 UN 2A 0.00176 0.00305 2B 0.00228 0.003953A 0.00130 0.00225 3B 0.00170 0.00295
5 – 4 or 5.000 – 4 UN 2A 0.00344 0.00595 2B 0.00445 0.007703A 0.00257 0.00445 3B 0.00335 0.00580
5 – 6 or 5.000 – 6 UN 2A 0.00303 0.00525 2B 0.00393 0.006803A 0.00225 0.00390 3B 0.00294 0.00510
52
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Equivalent Change Allowable Equivalent ChangeNominal Size Variation in Functional Variation in Functional
and Series in Lead, Diameter, in., in Lead, Diameter, in.Threads/in. Designation Class in. (±) 1⁄2Td2 (+) Class in. (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
5 – 8 or 5.000 – 8 UN 2A 0.00280 0.00485 2B 0.00364 0.006303A 0.00211 0.00365 3B 0.00274 0.00475
5 – 12 or 5.000 – 12 UN 2A 0.00193 0.00335 2B 0.00251 0.004353A 0.00144 0.00250 3B 0.00191 0.00330
5 – 16 or 5.000 – 16 UN 2A 0.00176 0.00305 2B 0.00228 0.003053A 0.00130 0.00225 3B 0.00170 0.00295
51⁄8 – 8 or 5.125 – 8 UN 2A 0.00280 0.00485 2B 0.00364 0.006303A 0.00211 0.00365 3B 0.00274 0.00475
51⁄8 – 12 or 5.125 – 12 UN 2A 0.00193 0.00335 2B 0.00251 0.004353A 0.00144 0.00250 3B 0.00191 0.00330
51⁄8 – 16 or 5.125 – 16 UN 2A 0.00176 0.00305 2B 0.00228 0.003953A 0.00130 0.00225 3B 0.00170 0.00295
51⁄4 – 4 or 5.250 – 4 UN 2A 0.00346 0.00600 2B 0.00450 0.007803A 0.00260 0.00450 3B 0.00385 0.00585
51⁄4 – 8 or 5.250 – 8 UN 2A 0.00283 0.00490 2B 0.00367 0.006353A 0.00214 0.00370 3B 0.00277 0.00480
51⁄4 – 12 or 5.250 – 12 UN 2A 0.00193 0.00335 2B 0.00251 0.004353A 0.00144 0.00250 3B 0.00191 0.00330
51⁄4 – 16 or 5.250 – 16 UN 2A 0.00176 0.00305 2B 0.00228 0.003953A 0.00130 0.00225 3B 0.00170 0.00295
53⁄8 – 8 or 5.375 – 8 UN 2A 0.00286 0.00495 2B 0.00372 0.006453A 0.00214 0.00370 3B 0.00280 0.00485
53⁄8 – 12 or 5.375 – 12 UN 2A 0.00193 0.00335 2B 0.00251 0.004353A 0.00144 0.00250 3B 0.00191 0.00330
53⁄8 – 16 or 5.375 – 16 UN 2A 0.00176 0.00305 2B 0.00231 0.003953A 0.00130 0.00225 3B 0.00170 0.00295
51⁄2 – 4 or 5.500 – 4 UN 2A 0.00349 0.00605 2B 0.00456 0.007903A 0.00263 0.00455 3B 0.00341 0.00500
51⁄2 – 8 or 5.500 – 8 UN 2A 0.00286 0.00495 2B 0.00372 0.006453A 0.00214 0.00370 3B 0.00280 0.00485
51⁄2 – 12 or 5.500 – 12 UN 2A 0.00193 0.00335 2B 0.00251 0.004353A 0.00144 0.00250 3B 0.00191 0.00330
51⁄2 – 16 or 5.500 – 16 UN 2A 0.00176 0.00305 2B 0.00228 0.003953A 0.00130 0.00225 3B 0.00170 0.00295
55⁄8 – 8 or 5.625 – 8 UN 2A 0.00289 0.00500 2B 0.00375 0.006503A 0.00217 0.00375 3B 0.00283 0.00490
55⁄8 – 12 or 5.625 – 12 UN 2A 0.00199 0.00345 2B 0.00260 0.004503A 0.00150 0.00260 3B 0.00193 0.00335
55⁄8 – 16 or 5.625 – 16 UN 2A 0.00179 0.00310 2B 0.00234 0.004053A 0.00136 0.00235 3B 0.00176 0.00305
53⁄4 – 4 or 5.750 – 4 UN 2A 0.00352 0.00610 2B 0.00459 0.007953A 0.00266 0.00460 3B 0.00344 0.00595
53
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter (Cont’d)GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
External Internal
Allowable Allowable Equivalent ChangeNominal Size Variation Equivalent Change Variation in Functional
and Series in Lead, in. in Functional in Lead, in. Diameter, in.Threads/in. Designation Class (±) Diameter, 1⁄2Td2 Class (±) 1⁄2TD2 (−)
1 2 3 4 5 6 7 8
53⁄4 – 8 or 5.750 – 8 UN 2A 0.00289 0.00500 2B 0.00375 0.006503A 0.00217 0.00375 3B 0.00283 0.00490
53⁄4 – 12 or 5.750 – 12 UN 2A 0.00199 0.00345 2B 0.00260 0.004503A 0.00150 0.00260 3B 0.00193 0.00335
53⁄4 – 16 or 5.750 – 16 UN 2A 0.00179 0.00310 2B 0.00234 0.004053A 0.00136 0.00235 3B 0.00176 0.00305
57⁄8 – 8 or 5.875 – 8 UN 2A 0.00292 0.00505 2B 0.00378 0.006553A 0.00219 0.00380 3B 0.00283 0.00490
57⁄8 – 12 or 5.875 – 12 UN 2A 0.00199 0.00345 2B 0.00260 0.004503A 0.00150 0.00260 3B 0.00193 0.00335
57⁄8 – 16 or 5.875 – 16 UN 2A 0.00179 0.00310 2B 0.00234 0.004053A 0.00136 0.00235 3B 0.00176 0.00305
6 – 4 or 6.000 – 4 UN 2A 0.00358 0.00620 2B 0.00455 0.008053A 0.00268 0.00465 3B 0.00346 0.00600
6 – 8 or 6.000 – 8 UN 2A 0.00294 0.00510 2B 0.00384 0.006653A 0.00222 0.00385 3B 0.00286 0.00495
6 – 12 or 6.000 – 12 UN 2A 0.00199 0.00315 2B 0.00260 0.004503A 0.00150 0.00260 3B 0.00193 0.00335
6 – 16 or 6.000 – 16 UN 2A 0.00179 0.00310 2B 0.00234 0.004053A 0.00136 0.00235 3B 0.00176 0.00305
5.3.2 Long Length of Engagement Using StandardThread Gage Limits. ASME B1.2 recommends that thelength of the GO gage should approximate the lengthof engagement. However, it is sometimes more economi-cal to accept these threads with GO thread gages madefrom standard gage blanks (refer to ASME B47.1), whichhave length approximating the standard lengths ofengagement.
NOTE: When this is done, additional precautions are necessaryto determine the effect of cumulative variation of lead andstraightness of thread axis due to a long length of engagement.
If applicable, an additional allowance should be provided, pref-erably on the external thread, the amount of which should bethe diameter equivalent of the cumulative lead variation for theincreased length of engagement, equal to the sum of one-half thepitch diameter tolerances of the external and internal threadsallowed for the standard length of engagement.
EXAMPLE: 0.3750-24UNF-2A; LEp0.88 in. (2.35 diameters); withexternal and internal thread gages of standard length.
Add allowance equal to 1⁄2Td2 + 1⁄2TD2 for standard matingthreads. From Table 3, column 5, 1⁄2Td2 (standard)p0.0019.
From Table 3, column 8, 1⁄2TD2 (standard)p0.00245.The sum of these, after rounding, is equal to 0.0044, which is the
added allowance. Therefore, the thread is redesignated to indicate a
54
nonstandard external thread, with the allowance of 0.0044 sub-tracted from the basic size of 0.3750. New designation is 0.3706-24UNS-2A. The added allowance is also subtracted from the stan-dard major diameter and pitch diameter size limits. See para. 6.6.2.
5.4 Minor Diameter Tolerance and Allowance forExternal Threads
The tolerance for minor diameter is for reference only.In dimensioning external threads, the minimum minordiameter is not specified, being established by the crestof an unworn tool. In practice, the minor diameter ofan external thread is satisfactory when accepted by agage or gaging method that represents the maximum-material condition of the internal thread less the allow-ance, es, if any. A formula for the minor diameter toler-ance of external threads is given in para. 5.8.1(d).
5.5 Major Diameter Tolerance for Internal Threads
The tolerance for major diameter is for reference only.In dimensioning internal threads, the maximum majordiameter is not specified, being established by the crestof an unworn tool. In practice, the major diameter ofan internal thread is satisfactory when accepted by a
UNIFIED INCH SCREW THREADS ASME B1.1-2003
gage or gaging method that represents the maximum-material condition of an external thread which has noallowance. A formula for the major diameter toleranceof internal threads is given in para. 5.8.2(a).
5.6 Minor Diameter Tolerance and Length ofEngagement for Internal Threads
Formulas for the minor diameter tolerance for internalthreads are given in para. 5.8.2(c).
Internal thread minor diameter tolerances are suitablefor lengths of engagement up to 1.5 diameters. For appli-cations having shorter or longer lengths of engagement,it may be advantageous to decrease or increase the toler-ance as explained in para. 5.6.1.
5.6.1 The principal practical factors that governminor diameter tolerance are ease of tapping, standarddrill sizes, and height of engagement.NOTE: Height of engagement is measured in a radial direction,while length of engagement is measured in an axial direction.
Height of engagement correlates with the strippingstrength of the thread assembly and, therefore, also withthe length of engagement. It also correlates with thetendency toward disengagement of the threads on oneside when assembly is eccentric. The amount of possibleeccentricity is one-half of the sum of the allowance andpitch diameter tolerances on both mating threads. Fora given pitch, or height of thread, this sum increaseswith the diameter, and accordingly, this factor wouldrequire a decrease in minor diameter tolerance with anincrease in thread diameter. However, such a decreasein tolerance often is not feasible without requiring spe-cial drill sizes; therefore, to be able to use as many aspossible of the available standard drill sizes listed inASME B94.11M, the minor diameter tolerance forClasses 1B and 2B of a given pitch for 1⁄4 in. diameterand larger is constant.
There may be applications where the lengths ofengagement of the mating threads or the combinationof materials used for mating threads are such that themaximum tolerance may not provide the desiredstrength of the fastening. Experience has shown that forlengths of engagement less than 0.67D (the minimumthickness of standard nuts), the minor diameter toler-ance may be reduced without causing tapping diffi-culties.
In other applications, the length of engagement ofmating threads may be long because of design considera-tions or the combination of materials used for matingthreads. As the threads engaged increase in number,their height of engagement may be shallower and stilldevelop stripping strength greater than the externalthread breaking strength. In these cases, the maximumtolerance should be increased to reduce the possibilityof tapping difficulties.
It is particularly important to reduce the number ofminor diameter tolerances to a practical minimum. This
55
reduction is usually obvious to the producer of longerinternally threaded components, but sometimes is notunderstood by the user.
The tolerances for lengths of engagement less than0.33D are 0.50 times the formula values in para. 5.8.2(c). For lengths of engagement from 0.33D to 0.67D, thetolerances are 0.75 times the formula values; for lengthsof engagement from 0.67D to 1.5D, the tolerances areequal to the formula values; and for lengths of engage-ment over 1.5D, the tolerances are 1.25 times the formulavalues. Where the tolerance value so computed is morethan 0.394P, the value is adjusted to equal 0.394P.
5.7 Disposition of Allowance and Tolerance
The disposition of allowance, tolerance, and crestclearances for the various thread classes is shown inFigs. 2 and 3.
5.8 Formulas for Allowance and Tolerance
The following formulas for allowance and toleranceare used for unified formulation and apply to standardand special series screw threads.
The following symbols are used in the equations:D bscp basic major (nominal) diameter
LE p length of engagement, in.P p pitch, in.p 1/nH p height of fundamental triangle
p 0.86602540Pn p threads per inch
5.8.1 External Thread(a) Allowance (External Threads)
(1) Classes 1A and 2A p 0.300 Class 2A pitch diam-eter tolerance1
(2) Class 3A p no allowance
(b) Major Diameter Tolerance (External Threads)(1) Class 1A p 0.090 3�P 2
(2) Classes 2A and 3A p 0.060 3�P2
The tolerance for Class 2A coarse and the 8-threadseries threads of unfinished, hot-rolled material is0.0903�P2. This does not apply to standard fasteners withrolled threads.
(c) Pitch Diameter Tolerance (External Threads)(1) Class 1A p 1.500 Class 2A pitch diameter tol-
erance1
(2) Class 2A p 0.0015 3�D + 0.0015 �LE + 0.015 3�P 2
NOTE: See Table 4 for the values of these terms corresponding togiven values of diameter, length of engagement.1
(3) Class 3A p 0.750 Class 2A pitch diameter tol-erance1
1 Calculations shall use Class 2A pitch diameter tolerance withsix decimal places. Final values shall be rounded to four deci-mal places.
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e4
Incr
emen
tsin
Pitc
hD
iam
eter
Tole
ranc
e—
Clas
s2A
�PD
Tole
ranc
ep
0.00
153 �
D+
0.00
15�
LE+
0.01
53 �P
2 �
Leng
thof
Enga
gem
ent,
LE
Bas
edon
Bas
edon
Not
e(1
)B
ased
onN
ote
(1)
Not
e(1
)
Dia
met
er,
DPi
tch,
P1
D9P
20P
1D
9P20
P1
D20
Pfo
rfo
rfo
rfo
rfo
rfo
rfo
rfo
rTh
read
s/
D0.
0015
3 �D
D0.
0015
3 �D
Siz
esTP
ITP
ILE
0.00
15�L
ES
izes
TPI
TPI
LE0.
0015
�LE
Siz
esTP
ILE
0.00
15�L
Ein
.0.
015
3 �P2
0.06
000.
0005
871.
9375
0.00
1870
#0..
...
.0.
0600
0.00
0367
1 ⁄ 218
400.
5000
0.00
1061
23 ⁄ 8..
.2.
3750
0.00
2312
800.
0008
080.
0625
0.00
0595
2.00
000.
0018
901 ⁄ 1
6..
...
.0.
0625
0.00
0375
...
...
360.
5556
0.00
1118
21 ⁄ 28
2.50
000.
0023
7272
0.00
0867
0.07
300.
0006
272.
1250
0.00
1928
#1..
...
.0.
0730
0.00
0405
9 ⁄ 16
16..
.0.
5625
0.00
1125
25 ⁄ 8..
.2.
6250
0.00
2430
640.
0009
380.
0860
0.00
0662
2.25
000.
0019
663 ⁄ 6
4..
...
.0.
0781
0.00
0419
5 ⁄ 8..
.32
0.62
500.
0011
8623 ⁄ 4
...
2.75
000.
0024
8760
0.00
0979
0.09
380.
0006
822.
3750
0.00
2001
#2..
...
.0.
0860
0.00
0440
...
14..
.0.
6429
0.00
1203
...
72.
8571
0.00
2535
560.
0010
25
0.09
900.
0006
942.
5000
0.00
2036
3 ⁄ 32
...
...
0.09
380.
0004
5911
⁄ 16
...
...
0.68
750.
0012
4427 ⁄ 8
...
2.87
500.
0025
4350
0.00
1105
0.11
200.
0007
232.
6250
0.00
2069
#3..
...
.0.
0990
0.00
0472
...
13..
.0.
6923
0.00
1248
3..
.3.
0000
0.00
2598
480.
0011
360.
1250
0.00
0750
2.75
000.
0021
027 ⁄ 6
4..
...
.0.
1094
0.00
0496
...
...
280.
7143
0.00
1268
31 ⁄ 8..
.3.
1250
0.00
2652
440.
0012
040.
1380
0.00
0775
2.87
500.
0021
33#4
...
...
0.11
200.
0005
02..
...
.27
0.74
070.
0012
9131 ⁄ 4
...
3.25
000.
0027
0442
0.00
1241
0.16
400.
0008
213.
0000
0.00
2163
...
80..
.0.
1125
0.00
0503
3 ⁄ 412
...
0.75
000.
0012
99..
.6
3.33
330.
0027
3940
0.00
1282
0.18
750.
0008
593.
1250
0.00
2193
#572
...
0.12
500.
0005
30..
.11
1 ⁄ 2..
.0.
7826
0.00
1327
33 ⁄ 8..
.3.
3750
0.00
2756
360.
0013
760.
1900
0.00
0862
3.25
000.
0022
22#6
...
..0.
1380
0.00
0557
13⁄ 1
6..
...
.0.
8125
0.00
1352
31 ⁄ 2..
.3.
5000
0.00
2806
340.
0014
290.
2160
0.00
0900
3.37
500.
0022
50..
.64
...
0.14
060.
0005
62..
.11
...
0.81
820.
0013
5735 ⁄ 8
...
3.62
500.
0028
5632
0.00
1488
0.25
000.
0009
453.
5000
0.00
2277
5 ⁄ 32
...
...
0.15
620.
0005
93..
...
.24
0.83
330.
0013
6933 ⁄ 4
...
3.75
000.
0029
0530
0.00
1554
0.31
250.
0010
183.
6250
0.00
2304
...
56..
.0.
1607
0.00
0601
7 ⁄ 8..
...
.0.
8750
0.00
1403
37 ⁄ 8..
.3.
8750
0.00
2953
280.
0016
27
0.37
500.
0010
823.
7500
0.00
2330
#8..
...
.0.
1640
0.00
0607
...
10..
.0.
9000
0.00
1423
45
4.00
000.
0030
0027
0.00
1667
0.43
750.
0011
393.
8750
0.00
2356
11⁄ 6
4..
...
.0.
1719
0.00
0622
15⁄ 1
6..
...
.0.
9375
0.00
1452
41 ⁄ 8..
.4.
1250
0.00
3047
260.
0017
090.
5000
0.00
1191
4.00
000.
0023
813 ⁄ 1
648
...
0.18
750.
0006
501
920
1.00
000.
0015
0041 ⁄ 4
...
4.25
000.
0030
9224
0.00
1803
0.56
250.
0012
384.
1250
0.00
2406
#10
...
...
0.19
000.
0006
5411 ⁄ 1
6..
...
.1.
0625
0.00
1546
43 ⁄ 8..
.4.
3750
0.00
3137
220.
0019
100.
6250
0.00
1282
4.25
000.
0024
3013
⁄ 64
...
...
0.20
310.
0006
76..
...
.18
1.11
110.
0015
81..
.41 ⁄ 2
4.44
440.
0031
6220
0.00
2036
0.68
750.
0013
244.
3750
0.00
2453
...
44..
.0.
2045
0.00
0678
11 ⁄ 88
...
1.12
500.
0015
9141 ⁄ 2
...
4.50
000.
0031
8218
0.00
2184
0.75
000.
0013
634.
5000
0.00
2476
#12
...
...
0.21
600.
0006
9713 ⁄ 1
6..
...
.1.
1875
0.00
1635
45 ⁄ 8..
.4.
6250
0.00
3226
160.
0023
620.
8125
0.00
1400
4.62
500.
0024
997 ⁄ 3
2..
...
.0.
2188
0.00
0702
11 ⁄ 4..
.16
1.25
000.
0016
7743 ⁄ 4
...
4.75
000.
0032
6914
0.00
2582
0.87
500.
0014
354.
7500
0.00
2521
...
40..
.0.
2250
0.00
0712
...
7..
.1.
2857
0.00
1701
47 ⁄ 8..
.4.
8750
0.00
3312
130.
0027
130.
9375
0.00
1468
4.87
500.
0025
4315
⁄ 64
...
...
0.23
440.
0007
2615 ⁄ 1
6..
...
.1.
3125
0.00
1718
54
5.00
000.
0033
5412
0.00
2862
1.00
000.
0015
005.
0000
0.00
2565
1 ⁄ 436
800.
2500
0.00
0750
13 ⁄ 8..
...
.1.
3750
0.00
1759
51 ⁄ 8..
.5.
1250
0.00
3396
111 ⁄ 2
0.00
2944
1.06
250.
0015
315.
1250
0.00
2586
17⁄ 6
4..
...
.0.
2656
0.00
0773
...
...
141.
4286
0.00
1793
51 ⁄ 4..
.5.
2500
0.00
3437
110.
0030
331.
1250
0.00
1560
5.25
000.
0026
07..
...
.72
0.27
780.
0007
9117 ⁄ 1
6..
...
.1.
4375
0.00
1798
53 ⁄ 8..
.5.
3750
0.00
3478
100.
0032
321.
1875
0.00
1588
5.37
500.
0026
28..
.32
...
0.28
120.
0007
9511 ⁄ 2
6..
.1.
5000
0.00
1837
51 ⁄ 2..
.5.
5000
0.00
3518
90.
0034
671.
2500
0.00
1616
5.50
000.
0026
4819
⁄ 64
...
...
0.29
690.
0008
17..
...
.13
1.53
850.
0018
6155 ⁄ 8
...
5.62
500.
0035
588
0.00
3750
56
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e4
Incr
emen
tsin
Pitc
hD
iam
eter
Tole
ranc
e—
Clas
s2A
(Con
t’d)
�PD
Tole
ranc
ep
0.00
153 �
D+
0.00
15�
LE+
0.01
53 �P
2 �
Leng
thof
Enga
gem
ent,
LE
Bas
edon
Bas
edon
Not
e(1
)B
ased
onN
ote
(1)
Not
e(1
)
Dia
met
er,
DPi
tch,
P1
D9P
20P
1D
9P20
P1
D20
Pfo
rfo
rfo
rfo
rfo
rfo
rfo
rfo
rTh
read
s/
D0.
0015
3 �DD
0.00
153 �D
Siz
esTP
ITP
ILE
0.00
15�L
ES
izes
TPI
TPI
LE0.
0015
�LE
Siz
esTP
ILE
0.00
15�L
Ein
.0.
015
3 �P2
1.31
250.
0016
425.
6250
0.00
2668
5 ⁄ 16
...
640.
3125
0.00
0839
19 ⁄ 16
...
...
1.56
250.
0018
7553 ⁄ 4
...
5.75
000.
0035
977
0.00
4099
1.37
500.
0016
685.
7500
0.00
2687
...
28..
.0.
3214
0.00
0850
15 ⁄ 8..
...
.1.
6250
0.00
1912
57 ⁄ 8..
.5.
8750
0.00
3636
60.
0045
431.
4375
0.00
1693
5.87
500.
0027
0721
⁄ 64
...
...
0.32
810.
0008
59..
...
.12
1.66
670.
0019
366
...
6.00
000.
0036
7451 ⁄ 2
0.00
4814
1.50
000.
0017
176.
0000
0.00
2726
...
2760
0.33
330.
0008
66111
⁄ 16
...
...
1.68
750.
0019
4961 ⁄ 2
...
6.50
000.
0038
245
0.00
5130
1.56
250.
0017
417.
0000
0.00
2869
11⁄ 3
2..
...
.0.
3438
0.00
0880
...
...
111 ⁄ 2
1.73
910.
0019
787
...
7.00
000.
0039
6941 ⁄ 2
0.00
5503
1.62
500.
0017
648.
0000
0.00
3000
...
...
560.
3571
0.00
0896
13 ⁄ 4..
...
.1.
7500
0.00
1984
71 ⁄ 2..
.7.
5000
0.00
4108
40.
0059
531.
6875
0.00
1786
9.00
000.
0031
2023
⁄ 64
...
...
0.35
940.
0008
99..
.5
...
1.80
000.
0020
128
...
8.00
000.
0042
43..
...
.1.
7500
0.00
1808
10.0
000
0.00
3232
3 ⁄ 824
...
0.37
500.
0009
19113
⁄ 16
...
...
1.81
250.
0020
1981 ⁄ 2
...
8.50
000.
0043
73..
...
.1.
8125
0.00
1829
12.0
000
0.00
3434
25⁄ 6
4..
...
.0.
3906
0.00
0937
...
...
111.
8182
0.00
2023
9..
.9.
0000
0.00
4500
...
...
1.87
500.
0018
5014
.000
00.
0036
1513
⁄ 32
...
...
0.40
630.
0009
5617 ⁄ 8
...
...
1.87
500.
0020
5491 ⁄ 2
...
9.50
000.
0046
23..
...
.
...
...
16.0
000
0.00
3780
...
...
480.
4167
0.00
0968
115⁄ 1
6..
...
.1.
9375
0.00
2088
10..
.10
.000
00.
0047
43..
...
...
...
.18
.000
00.
0039
3127
⁄ 64
...
...
0.42
190.
0009
742
41 ⁄ 210
2.00
000.
0021
2110
1 ⁄ 2..
.10
.500
00.
0048
61..
...
...
...
.20
.000
00.
0040
727 ⁄ 1
6..
...
.0.
4375
0.00
0992
21 ⁄ 8..
...
.2.
1250
0.00
2187
11..
.11
.000
00.
0049
75..
...
...
...
.24
.000
00.
0043
27..
.20
...
0.45
000.
0010
06..
...
.9
2.22
220.
0022
3611
1 ⁄ 2..
.11
.500
00.
0050
87..
...
...
...
...
...
...
...
.44
0.45
450.
0010
1121 ⁄ 4
4..
.2.
2500
0.00
2250
12..
.12
.000
00.
0051
96..
...
.
GEN
ERA
LN
OTE
:Cl
ass
2Ato
lera
nces
are
the
base
sfo
rth
eto
lera
nces
for
Clas
ses
1A,
3A,
1B,
2B,
and
3B.
NO
TE:
(1)
For
exam
ple:
LEp
0.50
00is
equi
vale
ntto
one
diam
eter
for
the
1 ⁄ 2in
.si
ze,
9pi
tche
sfo
r18
thre
ads
per
inch
,or
20pi
tche
sfo
r40
thre
ads
per
inch
.
57
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
(d) Minor Diameter Tolerance (External Threads)(1) UNR Classes. To intersection of rounded root
with its centerline (see Figs. 2 and 3), equals pitch diame-ter tolerance for class of thread specified, plus0.10825318P (see Table 5).
(2) UN Classes 1A, 2A, and 3A. To intersection offlat root with flanks of threads (see Figs. 2 and 3), equalspitch diameter tolerance for class of thread specified,plus 0.21650635P (see Table 5).
5.8.2 Internal Thread(a) Major Diameter Tolerance (Internal Threads)
(1) For Classes 1B, 2B, and 3B, equals 0.14433757P(see Table 5) plus the pitch diameter tolerance of theclass of thread under consideration.
(b) Pitch Diameter Tolerance (Internal Threads)(1) Class 1B p 1.950 Class 2A pitch diameter toler-
ance (nominally equal to 1.5 Class 2B)1 (see page 55 forfootnote)
(2) Class 2B p 1.300 Class 2A pitch diameter tol-erance1
(3) Class 3B p 0.975 Class 2A pitch diameter toler-ance (nominally equal to 0.750 Class 2B)1
(c) Minor Diameter Tolerance (Internal Threads)(1) Classes 1B and 2B. For all thread series
and special threads in sizes less than 1 ⁄4 in., equals[0.0500 3�P 2 + 0.03 P/D] − 0.002 in., within the followinglimitations:
(a) Tolerances shall not be greater than 0.39400P.(b) Tolerances shall not be less than 0.2500P −
0.400P2
The formulas are suitable for general applications hav-ing lengths of engagement up to 1.5 diameters.
For all thread series and special threads 1⁄4 in. andlarger, 80 to 4 threads per inch, inclusive, equals 0.25P− 0.4P2. For all thread series and special threads 1⁄4 in.and larger with less than 4 threads per inch, equals 0.15P.
(2) Class 3B. For all thread series, equals[0.05 3�P 2 + 0.03 P/D] − 0.002 in., within the followinglimitations:
(a) Tolerance shall be not greater than 0.394P.(b) Tolerance shall be not less than
(1) for 80 to 13 threads per inch, inclusive,0.23P − 1.5P2
(2) for 12 threads per inch and coarser, 0.120PThe formulas are suitable for general applications hav-
ing lengths of engagement up to 1.5 diameters.
5.9 Lead and Flank Angle Tolerances
See para. 9.
5.10 Coated or Plated Threads
See para. 7 for dimensional accommodation and limitsfor coated threads.
58
5.11 Circular Runout
5.11.1 Circular Runout Is the Full Indicator Movement(FIM) (See ASME Y14.5). Runout of the crest (minor diam-eter of internal thread or major diameter of externalthread) relative to the functional diameter cylinder shallnot be so great that the basic profile is transgressed.
5.11.2 Internal Thread. Maximum runout, which willmaintain the crest inside the basic thread profile, is thedifference between the measured minor diameter andthe basic minor diameter. An out-of-round functionaldiameter cylinder may reduce the available runout.
5.11.3 External Thread. Maximum runout, which willmaintain the crest inside the basic thread profile, is thedifference between the measured major diameter andthe basic major diameter. An out-of-round functionaldiameter cylinder may reduce the available runout.
6 SCREW THREAD DESIGNATION
6.1 Basic Method of Designating
The designation specifies in sequence the nominalsize, number of threads per inch, thread series symbol,thread class symbol, and gaging system per ASME B1.3(see screw thread designations listed at the end of thisparagraph). The nominal size is the basic major diameterand is specified as the fractional diameter, screw number,or their decimal equivalent. Where decimal equivalentsare used for size callout, they shall be shown in fourplace decimals (omitting the cipher in the fourth place)for fractional sizes, and in three place decimals for num-ber sizes. They shall be interpreted as being nominalsize designations only and shall have no dimensionalsignificance beyond the fractional size or number desig-nation. The thread series symbol indicates the threadform (see para. 2), series, and tolerance formulation (seepara. 3). The thread series symbols for the UN threadform are UNC, UNF, UNEF, or UN for only those sizesof the various series shown in Table 1 and UNS forany other intermediate and larger size diameter-pitchcombination having tolerances to unified formulation.The corresponding thread series symbols for the UNRthread form are UNRC, UNRF, UNREF, or UNR. Thesymbol UNRS corresponds to UNS. The thread classsymbols are 1A, 1B, 2A, 2B, 3A, or 3B, where the suffixesA and B relate to external and internal threads, respec-tively.
The basic method of designating a screw thread isused where the standard tolerances or limits of sizebased on the standard length of engagement are applica-ble, as indicated in para. 5.
UNS threads and threads having special length ofengagement require certain additional information asshown in paras. 6.4 and 6.6.
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 5 Thread Form Data
0.1875H[Note (1)] 0.2500H
0.1250H [Note (1)]Truncation of[Note (1)]UNR Design External
Basic Flat at Flat at Truncation of Profile Thread Root0.1667HInternal Internal Internal External andH [Note (1)]
Thread Crest, Thread Root Thread Root Thread Root Truncation of[Note (1)]and External and External and External External and Half InternalUN Thread Thread Crest, Height of Thread Crest, Thread Root Addendum of Thread Crest,Root, Frs p Frn p Fcs p Sharp frn p fes p Full Radius, External frs p fcn p
Threads/ Fcn p P/4 p P/8 p V-Thread p 0.10825318P Max., rrs p Thread, Srs p 0.21650635Pin. Pitch, P 0.25000000P 0.12500000P 0.86602540P [Note (2)] 0.14433757P 0.16237976P [Note (3)]
1 2 3 4 5 6 7 8 9
80 0.01250000 0.003125 0.001563 0.010825 0.001353 0.001804 0.002030 0.00270672 0.01388889 0.003472 0.001736 0.012028 0.001504 0.002005 0.002255 0.00300764 0.01562500 0.003906 0.001953 0.013532 0.001691 0.002255 0.002537 0.00338356 0.01785714 0.004464 0.002232 0.015465 0.001933 0.002577 0.002900 0.00386648 0.02083333 0.005208 0.002604 0.018042 0.002255 0.003007 0.003383 0.00451144 0.02272727 0.005682 0.002841 0.019682 0.002460 0.003280 0.003690 0.00492140 0.02500000 0.006250 0.003125 0.021651 0.002706 0.003608 0.004059 0.005413
36 0.02777778 0.006944 0.003472 0.024056 0.003007 0.004009 0.004511 0.00601432 0.03125000 0.007813 0.003906 0.027063 0.003383 0.004511 0.005074 0.00676628 0.03571429 0.008929 0.004464 0.030929 0.003866 0.005155 0.005799 0.00773227 0.03703704 0.009259 0.004630 0.032075 0.004009 0.005346 0.006014 0.00801924 0.04166667 0.010417 0.005208 0.036084 0.004511 0.006014 0.006766 0.00902120 0.05000000 0.012500 0.006250 0.043301 0.005413 0.007217 0.008119 0.01082518 0.05555556 0.013889 0.006944 0.048113 0.006014 0.008019 0.009021 0.012028
16 0.06250000 0.015625 0.007813 0.054127 0.006766 0.009021 0.010149 0.01353214 0.07142857 0.017857 0.008929 0.061859 0.007732 0.010310 0.011599 0.01546513 0.07692308 0.019231 0.009615 0.066617 0.008327 0.011103 0.012491 0.01665412 0.08333333 0.020833 0.010417 0.072169 0.009021 0.012028 0.013532 0.01804211.5 0.08695652 0.021739 0.010870 0.075307 0.009413 0.012551 0.014120 0.01882711 0.09090909 0.022727 0.011364 0.078730 0.009841 0.013122 0.014762 0.01968210 0.10000000 0.025000 0.012500 0.086603 0.010825 0.014434 0.016238 0.021651
9 0.11111111 0.027778 0.013889 0.096225 0.012028 0.016038 0.018042 0.0240568 0.12500000 0.031250 0.015625 0.108253 0.013532 0.018042 0.020297 0.0270637 0.14285714 0.035714 0.017857 0.123718 0.015465 0.020620 0.023197 0.0309296 0.16666667 0.041667 0.020833 0.144338 0.018042 0.024056 0.027063 0.0360845 0.20000000 0.050000 0.025000 0.173205 0.021651 0.028868 0.032476 0.0433014.5 0.22222222 0.055556 0.027778 0.192450 0.024056 0.032075 0.036084 0.0481134 0.25000000 0.062500 0.031250 0.216506 0.027063 0.036084 0.040595 0.054127
59
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 5 Thread Form Data (Cont’d)
0.625H[Note (1)]
Height of 0.9167HInternal [Note (1)]
Thread, UN0.375H 0.7500H 1.2500HExternal Difference[Note (1)] 0.6875H [Note (1)] [Note (1)] 1.3750H
Thread, and Between Max.[Note (1)] [Note (1)]Addendum of Depth of Twice the Major and Double Height
External Thread Height External Pitch of Internal Double HeightThread, Engagement, of UNR Thread Diameters of Thread and of External 0.5000Hhas p hs p hn p External Addendum, Internal External UN UNR Thread, [Note (1)]
Threads/ 0.32475953P he p Thread, hs p hb p 2has p Thread p Thread, 2hn p 2hs pin. [Note (4)] 0.54126588P 0.59539247P 0.64951905P 0.79385662P 1.08253175P 1.19078493P 0.43301270P
1 10 11 12 13 14 15 16 17
80 0.004059 0.006766 0.007442 0.008119 0.009923 0.013532 0.014885 0.00541372 0.004511 0.007518 0.008269 0.009021 0.011026 0.015035 0.016539 0.00601464 0.005074 0.008457 0.009303 0.010149 0.012404 0.016915 0.018606 0.00676656 0.005799 0.009665 0.010632 0.011599 0.014176 0.019331 0.021264 0.00773248 0.006766 0.011276 0.012404 0.013532 0.016539 0.022553 0.024808 0.00902144 0.007381 0.012301 0.013532 0.014762 0.018042 0.024603 0.027063 0.00984140 0.008119 0.013532 0.014885 0.016238 0.019846 0.027063 0.029770 0.010825
36 0.009021 0.015035 0.016539 0.018042 0.022052 0.030070 0.033077 0.01202832 0.010149 0.016915 0.018606 0.020297 0.024808 0.033829 0.037212 0.01353228 0.011599 0.019331 0.021264 0.023197 0.028352 0.038662 0.042528 0.01546527 0.012028 0.020047 0.022052 0.024056 0.029402 0.040094 0.044103 0.01603824 0.013532 0.022553 0.024808 0.027063 0.033077 0.045105 0.049616 0.01804220 0.016238 0.027063 0.029770 0.032476 0.039693 0.054127 0.059539 0.02165118 0.018042 0.030070 0.033077 0.036084 0.044103 0.060141 0.066155 0.024056
16 0.020297 0.033829 0.037212 0.040595 0.049616 0.067658 0.074424 0.02706314 0.023197 0.038662 0.042528 0.046394 0.056704 0.077324 0.085056 0.03092913 0.024982 0.041636 0.045799 0.049963 0.061066 0.083272 0.091599 0.03330912 0.027063 0.045105 0.049616 0.054127 0.066155 0.090211 0.099232 0.03608411.5 0.028240 0.047067 0.051773 0.056480 0.069031 0.094133 0.103547 0.03765311 0.029524 0.049206 0.054127 0.059047 0.072169 0.098412 0.108253 0.03936510 0.032476 0.054127 0.059539 0.064952 0.079386 0.108253 0.119078 0.043301
9 0.036084 0.060141 0.066155 0.072169 0.088206 0.120281 0.132309 0.0481138 0.040595 0.067658 0.074424 0.081190 0.099232 0.135316 0.148848 0.0541277 0.046394 0.077324 0.085056 0.092788 0.113408 0.154647 0.170112 0.0618596 0.054127 0.090211 0.099232 0.108253 0.132309 0.180422 0.198464 0.0721695 0.064952 0.108253 0.119078 0.129904 0.158771 0.216506 0.238157 0.0866034.5 0.072169 0.120281 0.132309 0.144338 0.176413 0.240563 0.264619 0.0962254 0.081190 0.135316 0.148848 0.162380 0.198464 0.270633 0.297696 0.108253
GENERAL NOTES:(a) All dimensions are in inches.(b) All thread calculations are to be performed using a function of pitch (P); the use of thread height (H) is for reference
only as stated in ASME B1.30.
NOTES:(1) The thread values based on a function of height “H” are used for reference only.(2) The values tabulated in column 6 also pertain to the minimum root radius of UNR screw threads. See paras. 2.3.1 and
2.3.1(a).(3) han p fcn p 0.25H p 0.21650635P(4) hdn p has p 0.375H p 0.32475953P
60
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Nominal size (fractional diameter or screwnumber, the decimal equivalant of eitherbeing optional)
Number of threads per in.Thread form and series (see dimensional
tables)Thread class symbol (see para. 4)
1⁄4 – 20 UNC – 2A or 0.250 – 20 UNC – 2A (21)10 – 32 UNF – 2A or 0.190 – 32 UNF – 2A (22)7⁄16 – 20 UNRF – 2A or 0.4375 – 20 UNRF – 2A (23)7⁄16 – 20 UNF – 2A or 0.4375 – 20 UNF – 2A (21)2 – 12 UN – 2A or 2.000 – 12 UN – 2A (23)
Thread gaging system per ASME B1.3
NOTE: Thread acceptability gaging system requirement of ASMEB1.3 may be added to the thread size designation as noted aboveor as specified in pertinent documentation, such as drawing orprocurement document.
6.2 Method of Designating Coated Threads
Specification on drawings of the before and after coat-ing dimensions for screw threads is sometimes dictatedby an engineering or production consideration that thesize before and after coating be controlled. This resultsfrom coated screw threads having two stages of design,the before coating stage and the after coating stage. Thethreaded product may be produced by a supplier andcoated by a user. In this case, it is necessary that aclear understanding of the coating requirements and theallowance for coating buildup be agreed upon by bothsupplier and user (see para. 7).
The before coating (plating) dimensions have a defi-nite bearing on the strength of the screw threads. Thebefore coating stage is, therefore, decidedly an engi-neering consideration; it is also a production consider-ation in requiring that proper allowance be made for thespecified coating thickness. The finished parts should beof a size after coating that will allow them to be assem-bled with their coating components as intended.
Recommended methods for designating coatedthread under various conditions are described inpara. 6.2.1.
6.2.1 For coated (or plated) Class 2A externalthreads, the basic (max.) major and basic (max.) pitchdiameters shall be given, preceded by the words AFTERCOATING. The major and pitch diameter limits of sizebefore coating shall also be given, preceded by the wordsBEFORE COATING.EXAMPLE:
3⁄4 – 10 UNC – 2A (21)
After Coating
Max. major diameter 0.7500� Values shown fromMax. PD 0.6850 Table 2 for Class 3A
Before Coating
Major diameter 0.7482 – 0.7353� Values shown fromPD 0.6832 – 0.6773 Table 2 for Class 2A
61
Threads accepted to Class 2A limits before coatingare accepted after coating by basic size Class 3A GOthread gages. The allowance given in the dimensionaltables for Class 2A thread is sufficient to allow for alimited amount of coating as described in para. 7. How-ever, if a greater coating thickness is required, it willbe necessary to calculate the before coating limits inaccordance with para. 7.
6.2.2 For coated (or plated) Class 3A externalthreads, the maximum major and maximum pitch diam-eters may optionally be given, preceded by the wordsAFTER COATING, thereby indicating that the threadbefore coating must have special provisions to allow forcoating thickness. The major and pitch diameter limitsof size before coating (calculated in accordance withpara. 7 shall be given, followed by the letters SPL (spe-cial) and preceded by the words BEFORE COATING.
EXAMPLE: Thickness of coating 0.0002 in. to 0.0003 in.1⁄4 – 28 UNF-3A (21)
After Coating
Max. major diameter 0.2500� OptionalMax. PD 0.2268 Information
Before Coating
Major diameter 0.2494 – 0.2431 SPLPD 0.2256 – 0.2235 SPL
6.2.3 For coated (or plated) Class 1A externalthreads, the maximum major and maximum pitch diam-eters may optionally be given, preceded by the wordsAFTER COATING, thereby indicating that the threadbefore coating must have special provisions to allow forcoating thickness. The major and pitch diameter limitsof size before coating (calculated in accordance withpara. 7 shall be given, followed by the letters SPL (spe-cial) and preceded by the words BEFORE COATING.
EXAMPLE: Thickness of coating 0.0002 in. to 0.0003 in.1⁄4 – 20 UNC-1A (21)
After Coating
Max. major diameter 0.2489� OptionalMax. PD 0.2164 Information
Before Coating
Major diameter 0.2483 – 0.2363 SPLPD 0.2152 – 0.2100 SPL
6.2.4 Where an allowance is required to accommo-date coating (or plating) on Class 1B, 2B, or 3B internalthreads, the minimum minor and minimum pitch diam-eters may optionally be given, preceded by the wordsAFTER COATING. The minor and pitch diameter limitsof size before coating (calculated in accordance withpara. 7 shall be given, followed by the letters SPL (spe-cial) and preceded by the words BEFORE COATING.
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
EXAMPLES: Thickness of coating 0.0002 in. to 0.0003 in.
(a) 1⁄4 – 20 UNC-1B (21)
After Coating
Min. minor diameter 0.196� OptionalMin. PD 0.2175 Information
Before Coating
Minor diameter 0.197 – 0.207 SPLPD 0.2187 – 0.2256 SPL
(b) 3⁄4 – 10 UNC-2B (22)
After Coating
Min. minor diameter 0.642� OptionalMin. PD 0.6850 Information
Before Coating
Minor diameter 0.643 – 0.663 SPLPD 0.6862 – 0.6935 SPL
(c) 1⁄4 – 28 UNF-3B (23)
After Coating
Min. minor diameter 0.2110� OptionalMin. PD 0.2268 Information
Before Coating
Minor diameter 0.2116 – 0.2194 SPLPD 0.2280 – 0.2308 SPL
NOTE: The after coating limits for all of the examplesabove are the minor and PD values in Table 2 for therespective class of thread.
6.3 Method of Designating Left-Hand Threads
Unless otherwise specified, threads are right hand; aleft-hand thread shall be designated LH as follows:
EXAMPLE: 1⁄4 – 20 UNC-3A-LH (21)
6.4 Method of Designating UNS Threads
UNS threads are special combinations of diameter andpitch with tolerance to unified formulation.
UNS threads have the basic form of designation setout above, supplemented always by the limits of size.
EXAMPLES:(a) 1⁄4 – 24 UNS-3A (21)
Major diameter 0.2500 – 0.2428PD 0.2229 – 0.2201Max. Minor diameter 0.205
(b) 0.495 – 20 UNS-3A (21)Major diameter 0.4950 – 0.4869PD 0.4625 – 0.4593Max. Minor diameter 0.441
(c) 1.200 – 10 UNS-2B (21)Minor diameter 1.092 – 1.113PD 1.1350 – 1.1432Min. Major diameter 1.200
62
6.5 Designations for Other Threads
Threads having tolerances that do not conform to uni-fied formulation and threads having multiple start orlead, or special form, also require additional considera-tions in the thread designation. The recommended meth-ods of designating these threads are described in paras.6.5.1 through 6.5.3.
6.5.1 Method of Designating Threads Having Toler-ances Not to Unified Formulation. If a standard seriesthread is altered in any respect other than revised pitchdiameter limits for a special length of engagement, themodification of crests, or the adjustment of the limitsof size to accommodate coating, as shown above, it isdesignated in accordance with the following:
EXAMPLES:(a) 7⁄16 – 24 Unified Form SPL-EXT (22)
Major diameter 0.4340 – 0.4280 SPLPD 0.4065 – 0.4025 SPLMax. Minor diameter 0.3889LE 0.38
(b) 1⁄2 – 13 Unified Form SPL-INT (22)Minor diameter 0.424 – 0.434 SPLPD 0.4500 – 0.4580 SPLMin. Major diameter 0.5000LE 0.50
6.5.2 Method of Designating Multiple Start Threads.If a thread is required with a multiple start or lead, itis designated by specifying in sequence the nominalsize, pitch (in decimals or threads per inch), and lead (indecimals or fractions), number of starts in parenthesis,thread series, class, and gaging system in parenthesis ifrequired to the following examples:
EXAMPLES:(a) 3⁄4 – 0.0625P – 0.1875L (3 STARTS) UNF SPL-EXT (23)
Major diameter 0.7485 – 0.7391PD 0.7079 – 0.7003 SPLMax. Minor diameter 0.6808LE 0.75
(b) 3⁄4 – 16 – 0.1875L (3 STARTS) UNF-2A (21)
6.5.3 Method of Designating Special Form Threads.If a thread for design consideration requires a variationfrom unified standard thread contour and is not coveredby another recognized standard, such as when the detailof the root differs from that for the standard thread form,the designation shall not include either the letters “UN”or the word “UNIFIED”, but shall be as follows:
EXAMPLE:7⁄8 – 18 SPL 60 deg Form-EXT (22)Major diameter 0.8750 – 0.8668PD 0.8384 – 0.8343Max. Minor diameter 0.8068LE 0.69
UNIFIED INCH SCREW THREADS ASME B1.1-2003
6.6 Method of Designating Threads Having SpecialLength of Engagement
In the assembly of threads in mating parts, the lengthof engagement varies according to the design require-ments. It should be noted that the length of engagementis not necessarily the same as the full thread lengthprovided on the part, but is the length of assembledthread in the mating parts.
Where a standard series thread has a special length ofengagement differing from that for which the standardpitch diameter tolerances are applicable as indicated inpara. 5, the thread class symbol is qualified by the addi-tion of the letters SE (special engagement) precedingthe class symbol. The specification of the special pitchdiameter limits of size and the length of engagementLE, rounded to a two place decimal, are a requirement.
EXAMPLES:(a) 1⁄2 – 13 UNC-SE2A (23)
PD 0.4485 – 0.4423LE 1.00
(b) 1⁄4 – 24 UNS-SE3A (23)Major diameter 0.2500 – 0.2428PD 0.2229 – 0.2194LE 0.88
6.6.1 In some cases where greater than standardlength of engagement is required, it is desirable to usestandard externally threaded parts with tolerancesbased on standard length of engagement. For example,in the case of a standard bolt assembled into a tappedhole in aluminum, the designation of the bolt threadwill conform to that of a thread for a standard lengthof engagement.
The designation for the tapped hole thread shouldinclude the allowance in the basic size, the pitch diame-ter limits of size, and the length of gage, in addition tothe information normally given. See para. 5.3.1(b).
EXAMPLE: Requiring use of 1.00 long GO thread and GO plaingages.
0.5025 – 13 UNS-SE2B (21)Minor diameter 0.420 – 0.437PD 0.4525 – 0.4606LG 1.00
Similarly, where greater than standard length ofengagement is required, it is desirable to use standardinternally threaded parts with tolerances based on stan-dard length of engagement. Therefore, the externalthread is provided with an added allowance. See para.5.3.1(c).
The designation for the external thread should includethe added allowance in the basic size, the pitch diameterlimits of size, and the length of gage, in addition to theinformation normally given.
63
EXAMPLE: Requiring use of 0.88 long GO thread and GO plaingages.
0.3725 – 24 UNS-SE2A (21)Major diameter 0.3714 – 0.3642PD 0.3443 – 0.3396LG 0.88
6.6.2 When a long length of engagement is requiredand standard length GO thread and GO plain gages areto be used, the thread designation should indicate thethread modifications and a standard gage length, LGStd. See para. 5.3.2.
EXAMPLES: With additional allowance indicating use of standardlength GO thread and GO plain gages.(a) 0.5058 – 13 UNS-2B (22)
Minor diameter 0.423 – 0.440PD 0.4558 – 0.4623LG Std.
(b) 0.3706 – 24 UNS-2A (22)Major diameter 0.3695 – 0.3623PD 0.3424 – 0.3386LG Std.
6.6.3 For applications of long length of engagementof mating parts involving very high strength materials,increases in tolerances based on standard length ofengagement may be detrimental. In these cases, the toler-ances based on the standard length of engagement maybe applied to increased length of engagement threads.This requires the GO thread gages to have a speciallength equal to the length of engagement as specified.
The designations for restricted applications should bequalified with the abbreviation SPL (special) as shownin the examples below. See para. 5.3.1(a)
EXAMPLES: Requiring use of 1.00 long GO thread and GOplain gages(a) 0.500 – 20 UNF-3A SPL (21)
LG 1.00 SPL
(b) 0.500 – 20 UNF-3B SPL (21)LG 1.00 SPL
NOTE: In drawings, tolerances tabulated for the standard lengthof engagement in ASME B1.1 shall apply over the full length ofengagement.
6.7 Method of Designating Threads Having ModifiedCrests
It is occasionally necessary to modify the limits of sizeof the major diameter of an external thread or the minordiameter of an internal thread within the maximum-material limits established for standard series and spe-cial threads in order to fit a specific purpose, but withoutchange in class of thread or pitch diameter limits. (Itshould be noted that standard pitch diameter gages maybe used to accept such threads.) Such threads shall bespecified with the established thread designation, fol-lowed by a statement of the modified diameter limitsand the designation MOD. This practice also applies tomodifications of internal thread minor diametersdescribed in para. 5.6.1.
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
EXAMPLES:(a) 3⁄8 – 24 UNF-3A MOD (21)
Major diameter 0.3720 – 0.3648 MOD(b) 11⁄2 – 10 UNS-3B MOD (21)
Minor diameter 1.398 – 1.409 MODPD 1.4350 – 1.4412Min. major diameter 1.500
7 DIMENSIONAL ACCOMMODATION OF COATINGOR PLATING FOR 60-deg THREADS
7.1 Introduction
It is not within the scope of this Standard to makerecommendations for thickness of, or to specify limitsfor, coatings. However, it will aid mechanical inter-changeability if certain principles are followed whereverconditions permit. The guidelines in paras. 7.4, 7.5, and7.6 should be helpful in determining the amount anddirection of the alterations to establish applicable limitsof size before coating threads with a 60 deg includedangle. Some commonly used and firmly established pro-cesses for heavy coatings, such as hot dip galvanizing,do not fall within the scope of this paragraph. Heavycoating, for purposes of this standard, is defined as acoating thickness greater than 0.25 times the thread’sallowance.
NOTE: The term coating refers to one or more applications ofadditive material to threads, including, but not limited to, electro-plated deposits, dip-spin applied materials, and mechanicallyapplied platings. It does not include soft or liquid lubricants thatare readily displaced in assembly and gaging.
This Standard specifies limits of size that pertainwhether threads are coated or uncoated. Only in Class2A threads is the allowance available to accommodatecoatings. Thus, in all classes of internal threads and inall Classes 1A and 3A external threads, limits of sizemust be adjusted before plating to provide suitable pro-vision for the desired coating.
7.2 Material Limits for Coated Threads
Unless otherwise specified, size limits for standardexternal thread Class 2A apply prior to coating. Theexternal thread allowance may thus be used to accom-modate the coating thickness on coated parts, providedthat the maximum coating thickness is no more thanone-fourth of the allowance (see Fig. 4). Thus, the threadafter coating is subject to acceptance using a basic Class3A GO thread gage and a Class 2A thread gage for eitherminimum material or NOT GO. Where external threadhas no allowance, or allowance must be maintained aftercoating, and for standard internal threads, sufficientallowance must be provided prior to coating to ensurethat finished product threads do not exceed the maxi-mum-material limits specified. For thread Class 3A,Class 2A allowances should be applied whenever possi-ble in accordance with calculations in para. 5.
64
7.3 Dimensional Effects of Coating
7.3.1 On a cylindrical surface, the effect of coatingis to change the diameter by twice the coating thickness,one coating thickness on each side of the cylinder. Ona screw thread, this would apply to the major and minordiameter.
7.3.2 Because the coating thickness is measured per-pendicular to the coated surface, while the pitch diame-ter is measured perpendicular to the thread axis, theeffect of a uniformly coated thread flank on the pitchdiameter is a change of four times the thickness of coat-ing on the flank (see Fig. 4). The diameters of externalthreads before coating will be smaller, while the diame-ters of internal threads before coating will be larger, thanthe coated diameters.
7.3.3 Most coatings and platings do not apply uni-formly on threads (see Fig. 5). Different coating materialsand processes have different application characteristics.The threaded part’s overall length and other configura-tion characteristics also affect the way the coatings buildup on the threads. Paragraphs 7.4, 7.5, and 7.6 providegeneral guidelines for calculating precoating thread sizeto allow for coating buildup while preventing interfer-ence in assembly. The exact precoating thread size fora given part with a given type of coating will frequentlyhave to be developed by the producer experimentally.
7.4 External Thread With Allowance Available forCoating
7.4.1 Maximum and Minimum Coating ThicknessSpecified. The amount of the allowance on the pitchdiameter is sufficient if 4 times the maximum coatingthickness is equal to or less than the allowance tabulatedin Table 2 or calculated per formula in para. 5.8.1(a).
7.4.2 Only Nominal or Minimum Coating ThicknessSpecified. If no thickness tolerance is given, it is recom-mended that a tolerance of plus 50% of the nominal orminimum thickness be assumed. Then the amount ofthe allowance on the pitch diameter is sufficient if 6times the specified coating thickness is equal to or lessthan the allowance tabulated in Table 2 or calculatedper formula in para. 5.8.1(a).
7.5 External Thread With No Allowance for Coating
7.5.1 Maximum and Minimum Coating ThicknessSpecified. To determine before coating gaging limitsdecrease
(a) the maximum pitch diameter by 4 times the maxi-mum coating thickness
(b) the minimum pitch diameter by 4 times the mini-mum coating thickness
(c) the maximum major diameter by 2 times the maxi-mum coating
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Pitch diameter of screw after coating
Pitch diameter of screw before coating
Thread axis
0.5 P(ref.)
0.5 P(ref.)
Enlarged View
0.5a
t
ta
0.25a = t and a = 4t or the pitch diameter of a 60 deg thread changes four times the thickness of coating
==
thickness of coatingpitch diameter change due to coating
Sine 30 deg (in small triangle above) = = 0.5t0.5a
30 deg
Fig. 4 Ratio of Pitch Diameter Change to Thickness of Coating on 60-deg Threads
(d) the minimum major diameter by 2 times the mini-mum coating thickness
EXAMPLE: 3⁄8 – 16 UNC-2A (21) AFTER COATINGCoating thickness 0.0002 – 0.0003 in.
To determine the before coating maximum materialsizes, decrease the maximum pitch diameter of 0.3331 in.by 0.0012 in. (4 � 0.0003) to 0.3319 in., and the maximummajor diameter of 0.3737 in. by 0.0006 in. (2 � 0.0003)to 0.3731 in. For the before coating minimum sizes,decrease the minimum pitch diameter of 0.3287 in. by
65
0.0008 in. (4 � 0.0002) to 0.3279 in., and the minimummajor diameter of 0.3643 in. by 0.0004 in. (2 � 0.0002)to 0.3639 in. The before coating sizes should be includedin the thread designation (see para. 6.2.1).
7.5.2 Only Nominal or Minimum Coating ThicknessSpecified. If no coating thickness tolerance is given, itis recommended that a tolerance of plus 50% of thenominal or minimum thickness be assumed. Then, todetermine before coating gaging limits for a coatedthread, decrease
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
The effects of electroplating on the functional diameter
Enlarged View
GENERAL NOTE: Electrodeposited coatings build up more heavily at sharp corners; is greater at the extreme ends andedges; and is least in the center and recessed areas.
Fig. 5 Effect of Electrodeposited Coatings on 60-deg External Threads
(a) the maximum pitch diameter by 6 times the coat-ing thickness
(b) the minimum pitch diameter by 4 times the coat-ing thickness
(c) the maximum major diameter by 3 times the coat-ing thickness
(d) the minimum major diameter by 2 times the coat-ing thickness
EXAMPLE: 1⁄2 – 13 UNC-3A (22)Coating thickness 0.0004 in.
Since the allowance for Class 2A thread is 0.0015 in.,the nominal or minimum coating thickness that may beapplied is equal to 0.0015 in. divided by 6, or 0.00025 in.(the maximum thickness of coating that may be appliedis equal to 0.0015 divided by 4 or 0.0038 in.). This is notsufficient for the required nominal or minimum coatingof 0.0004 in. specified, so additional adjustments to thebefore coating pitch and major diameters must be made.
To determine the before coating maximum materialsizes, decrease the maximum pitch diameter of 0.4500 in.by 0.0024 in. (6 � 0.0004) to 0.4476 in., and the maximummajor diameter of 0.5000 in. by 0.0012 in. (3 � 0.0004)to 0.4988 in. For the before coating minimum sizes,decrease the minimum pitch diameter of 0.4463 in. by0.0016 in. (4 � 0.0004) to 0.4447 in., and the minimummajor diameter of 0.4891 in. by 0.0008 in. (2 � 0.0004)to 0.4883 in. The before coating sizes should be includedin the thread designation (see para. 6.2.1).
66
7.5.3 Adjusted Size Limits. It should be noted in thepreceding examples that the before coating materiallimit tolerances are less than the tolerances after coating.This is because the coating tolerance consumes some ofthe product tolerance. In some instances, there may beinsufficient pitch diameter tolerance available in thebefore coating condition, so that additional adjustmentsand controls will be necessary.
7.5.4 Strength. On small thread sizes (0.190 in. andsmaller) there is a possibility that coating thicknessadjustments will cause base material (minimum) condi-tions that may significantly affect strength of externallythreaded parts. Limitations on coating thickness, or partredesign, may be necessary.
7.6 Internal Threads
Standard internal threads provide no allowance forcoating thickness. To determine before coating gaginglimits for a coated thread, increase
(a) the minimum pitch diameter by 4 times the maxi-mum coating thickness, if specified, or by 6 times theminimum or nominal coating thickness, if not specified
(b) the maximum pitch diameter by 4 times the mini-mum or nominal coating thickness
(c) the minimum minor diameter by 2 times the maxi-mum coating thickness, if specified, or by 3 times theminimum or nominal coating thickness, if not specified
(d) the maximum minor diameter by 2 times the mini-mum or nominal coating thickness
UNIFIED INCH SCREW THREADS ASME B1.1-2003
7.7 Electrodeposited Coatings
Electroplated coatings do not cover threads uniformly.Deposits build up more on thread crests than on threadflanks and coating thickness is greater on lead end of athread than on threads in the center of a part. The guide-lines for calculating precoating thread sizes for uni-formly coated threads can be used as a starting placein determining the precoating thread sizes on a givenpart, but the exact sizes for any given part may have tobe determined by trial and error experimentation.
One of the effects of electrodeposited coatings notapplying uniformly is that the functional diameter ofan external thread will generally increase by a greatermagnitude than the increase of the pitch diameter on agiven part. Depending on an externally threaded part’sconfiguration an electrodeposited coating of 0.0001 in.on a thread flank will probably result in a growth ofthe pitch diameter of approximately 0.0004 in., but thefunctional diameter may change by as much as 0.0006 in.or more. In the case of internally threaded parts, elec-trodeposited coatings cause the pitch diameter and func-tional diameter to decrease in size, with the pitchdiameter decreasing less than the functional diameteron a given part.
Another effect of the nonuniform buildup of electro-deposited coatings is that the coating thickness on thelead end of a thread is commonly greater than the thick-ness on the threads in the center of the part. This resultsin the pitch diameter and functional diameter of a threadto be considerably larger on the end of the part thantheir comparable measurements away from the end. Thelonger the part, in the case of external threads, or thethicker the part, in the case of internal threads, thegreater these differences tend to be. The part producerand the plater can not control this phenomenon. It is thenature of electrodeposited coatings on threaded parts. Itis conceivable that a part’s dimensions can measurewithin limits on the lead threads and be beyond theirlimits on the threads away from the lead threads.
7.8 Other Considerations
It is essential to adequately review all possibilitiesand consider limitations in the threading and coatingproduction processes before finalizing the coating pro-cess and the allowance required to accommodate thecoating. A no allowance thread after coating shall nottransgress the basic profile, and is therefore subject toacceptance using a basic Class 3A, 1B, 2B, or 3B size GOthread gage.
8 STANDARD SERIES THREADS (UN/UNR) ANDLIMITS OF SIZE FOR STANDARD SERIES ANDUNS/UNRS SERIES THREADS
8.1 Standard SeriesThe standard series for unified inch screw threads is
listed in Table 1. Although the designations shown are
67
for the UN thread form, UNR designations may be usedin all cases.
8.2 Limits of Size
The limits of size are defined by the design profileat its maximum-material condition and the minimumprofile at the minimum-material condition. The limitsare specified as diameters (major diameter, minor diam-eter, pitch diameter), and the practical interpretation ofthese limits on a three-dimensional threaded productdepends on the method of inspection/evaluation. Thesedimensions serve as a basis for measurement and gagingof the thread, but the methods, techniques, and equip-ment used for thread evaluation establish the degree ofthread conformance to the tabulated dimensions. Cur-rent techniques for measuring and gaging do not verifyexact conformance of a thread to its specified maximumand minimum envelope. See ASME B1.3 for gaging sys-tems for dimensional acceptability.
8.2.1 Limits of size for the majority of the standardseries are shown in Tables 2 and E-1. Until this Standardis revised to require the calculated and rounded valuesper ASME B1.30 shown in Table 2, both these and thevalues in Table E-1 will be equally acceptable. It is recom-mended that all users prepare for the eventual adoptionof only the values in Table 2.
Omissions are the secondary size range in the 4-UNseries, and all sizes over 6 in. refer to Table 1 for a listof secondary sizes.
8.2.2 Limits of size not given may be calculatedfrom the formulas given in the following paragraphs.Formulas and symbols for thread form are given inpara. 10.
8.3 Formulas for Limits of Size
These formulas were used to calculate the valuesshown in Table 2 for standard series. The followingsymbols are used in the equations. (See Figs. 1 and 6.)
D bsc p basic major (nominal) diameterD1 bsc p basic minor diameter (D − 2hn) (see Tables 6
through 16)D2 bsc p basic pitch diameter (D − hb) (see Tables 6
through 16)d3 p UNR series design minor diameter [d1 − (H/
8)] (see Tables 6 through 16)has p screw addendum height (see Table 5)hb p 2has (see Table 5)hn p height of internal thread (see Table 5)hs p height of external thread (see Table 5)P p pitch, in.
To obtain limits of size using the formulas, see Table5 for basic thread form data, para. 11 for basic dimen-sions, and para. 5 for formulas of allowance and toler-ance. For easy reference, outline guides for determining
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limits of size of external and internal threads are givenin Tables 17A and 17B.
8.3.1 External Thread(a) Maximum Major Diameter (External Threads)
(1) For Classes 1A and 2A, d p basic major diame-ter, D bsc, minus allowance.
(2) For Class 3A, d p basic major diameter, D bsc.(b) Minimum Major Diameter (External Threads). For all
classes, equals maximum major diameter, minus majordiameter tolerance for respective class of thread.
(c) Maximum Pitch Diameter (External Threads)(1) For Classes 1A and 2A, d2 p basic pitch diame-
ter D2 bsc, minus allowance.(2) For Class 3A, d2 p basic pitch diameter D2 bsc.
(d) Minimum Pitch Diameter (External Threads). For allclasses, equals maximum pitch diameter, minus pitchdiameter tolerance for respective class of thread.
(e) Maximum Minor Diameter (External Threads). Indimensioning UN series external threads, the minordiameter is not specified. In practice, the minor diameteris satisfactory when accepted by a standard GO threadgage in accordance with ASME B1.2. When it is desirableto obtain minor diameter values for reference purposesand for UNR threads, they can be calculated as follows:
(1) For UN series threads, the formulas are:(a) for Classes 1A and 2A, d1 p basic minor diam-
eter D1 bsc, minus allowance(b) for Class 3A, d1 p basic minor diameter
D1 bsc(2) For UNR series threads, the formulas are:
(a) for Classes 1A and 2A, d3 p basic minor diam-eter D1 bsc, minus allowance, minus H/8
(b) or Class 3A, d3 p basic minor diameter D1 bsc,minus H/8
(f) Minimum Minor Diameter (External Threads). Whenit is desirable for design purposes to calculate the mini-mum diameter, it can be obtained for all classes by theformula: minimum pitch diameter minus 0.64951905P.
8.3.2 Internal Thread(a) Maximum Major Diameter (Internal Threads). In
dimensioning internal threads, the maximum majordiameter is not specified, being established by the crestof an unworn tool. In practice, the major diameter ofan internal thread is satisfactory when accepted by agage or gaging method that represents the maximum-material condition of an external thread that has noallowance.
(b) Minimum Major Diameter (Internal Threads), D bsc.For all classes, equals basic diameter D bsc.
(c) Minimum Pitch Diameter. For all classes, D2 bscequals basic pitch diameter D2 minimum.
(d) Maximum Pitch Diameter (Internal Threads). For allclasses, equals minimum pitch diameter D2 bsc, pluspitch diameter tolerance for respective class of thread.
68
(e) Minimum Minor Diameter (Internal Threads). For allclasses, D1 bsc equals minimum pitch diameter D2 mini-mum minus 0.43301122P, then rounded off to the nearest0.001 in. for sizes 0.138 in. and larger. For Class 3B, acipher is added to yield four decimal places.
(f) Maximum Minor Diameter (Internal Threads). Allclasses are calculated before rounding, then rounded forClasses 1B and 2B to the nearest 0.001 in. for sizes 0.138in. and larger. Class 3B values are rounded to four deci-mal places.
8.4 Example of Calculations From Formulas
Tables 18A and 18B are based on the practices forcalculating and rounding screw thread dimensions asspecified in ASME B1.30.
9 LEAD AND ANGLE TOLERANCES
9.1 Lead and Flank Angle Acceptance
Acceptance of lead and flank angles of product screwthreads shall be in accordance with the following. Also,these are factors contributing to visual identification ofgross defects in thread profile.
9.1.1 When Thread Gaging System 21 of ASME B1.3is specified, product thread lead (including helix) andflank angle variations are not considered as separateelements.
9.1.2 When Thread Gaging System 22 of ASME B1.3is specified, with the pitch diameter or thread-groovediameter inspection/evaluation required, the productthread lead (including helix) and flank angles shall beconsidered acceptable when the minimum-materialcharacteristic (pitch diameter or thread-groove diameterin Tables 1 and 2, columns C and D of ASME B1.3) andthe maximum-material characteristic (GO in Tables 1and 2, column A of ASME B1.3) are accepted by thegages specified for System 22, over the standard GOthread gage length.
When Thread Gaging System 22 is specified with NOTGO functional diameter combined with inspection/evaluation of lead and flank option, agreements mustbe reached between the purchaser and the supplier onlead and flank angle limits and method of evaluation.
9.1.3 When Thread Gaging System 23 of ASME B1.3is specified, product thread lead and flank angles shallbe acceptable if within the allowable variations specifiedin Tables 3 and 19, respectively. Also, the minimum-material characteristic (pitch diameter or thread-groovediameter in Tables 1 and 2, columns C and D of ASMEB1.3) and the maximum-material characteristic (GO inTables 1 and 2, column A of ASME B1.3) must beaccepted by the gages specified for System 23, over thestandard GO thread gage length.
Allowable variations in lead and flank angles are max-imum values. Maximum variation in these and pitch
UNIFIED INCH SCREW THREADS ASME B1.1-2003
diameter tolerance cannot be taken simultaneously (seeparas. 9.1.5 and 9.1.6).
9.1.4 When individual inspection/evaluation of lead(including helix) and flank angle variations are requiredin addition to thread gaging System 21 or 22 of ASMEB1.3, the allowable variations for these characteristicsshall be as specified in Tables 3 and 19.
9.1.5 For sizes not included in Tables 3 and 19, theallowable lead variation is equal to 0.57735 times one-half the pitch diameter tolerance. This is the lead varia-tion that causes a change in functional diameter equalto one-half the pitch diameter tolerance. The allowableflank half-angle variation in minutes of arc is equal to30 plus 1.875 times the number of threads per inch,rounded to the nearest 5 min.
9.1.6 For the requirements of paras. 9.1.4 and 9.1.5,lead variation values tabulated or calculated are themaximum variations from specified lead between anytwo points not farther apart than the length of the stan-dard GO thread gage. Flank angle variation values aremaximum variations from the basic 30 deg anglebetween thread flanks and perpendiculars to thethread axis.
10 FORMULAS AND SYMBOLS FOR THREAD FORM
10.1 Thread Form Formulas and Symbols
Formulas are given below; data are tabulated inTable 5.
The general symbols used are defined in Table 20 andapplication of the symbols is shown in Fig. 6.
(a) Included Angle of Thread
2� p 60 deg
(b) Half angle of thread
� p 30 deg
(c) Number of threads per inch (TPI) is 1/P Pitch ofthread.
P p 1/TPI
(d) Height of sharp V-thread (fundamental triangle)
H p 0.86602540P
(e) Height of UNR external thread, design form
hs p 0.59539247P p (11/16H)
(f) Height of internal thread and UN external thread
hs p hn p 0.54126588P p (5/8H)
(g) Height of thread engagement
hs p 0.54126588P p (5/8H)
69
(h) Flat at crest of external thread
Fcs p 0.12500000P p P/8
(i) Truncation of UN external thread crest
fcs p 0.10825318P p (H/8)
(j) Truncation of UNR external thread (for calculatingminor diameter values in tables)
Srs p 0.16237976P p (3/16H)
(k) Basic flat at crest of internal thread and root ofexternal thread
Frs p Fcn p 0.25000000P p P/4
(l) Truncation of internal thread crest
fcn p 0.21650635P p (H/4)
(m) Flat at root of internal thread
Frn p 0.12500000P p P/8
(n) Truncation of internal thread root
frn p 0.10825318P p (H/8)
(o) Addendum of external thread
has p 0.32475953P p (3/8H)
(p) Major diameter of external thread is d. Pitch diam-eter of external thread
d2 p d − 2has p d − 0.64951905P
(q) Minor diameter of UNR external thread
d3 p d − 2hs p 1.19078493P
(r) Minor diameter of UN external thread
d1 p d − 2hs p d − 1.08253175P
(s) Major diameter of internal thread is D. Pitch diam-eter of internal thread is D2. Minor diameter of internalthread:
D1 p D − 2hn p D − 1.08253175P
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11 TABLES OF BASIC DIMENSIONS
11.1 Table Content
The basic dimensions tabulated in Tables 6 through 16include major diameter, pitch diameter, minor diameterof external threads, minor diameter of internal threads,
Lts
Ltn
LE
P
�2�1
Min
or
dia
m.
Leading flank
Following flankLeading flank
Following flank
Vanish thread
Complete thread [Note (1)]
Count pitches at crest
Start of first complete external thread
End of externally threaded fastener
HelixHelix angle
90 deg
es/2
he�d2
(360 deg)
Start of first complete thread
Vanish cone
Pit
ch d
iam
.
Maj
or
dia
m.
Lead angle
Lead“Unrolled ”pitch cylinder
Lead and Helix AnglesThread With an Allowance
Minimum internal thread
Maximum external thread
�
NOTE:(1) Portion of thread fully formed at crest and root.
Fig. 6 Application of General Thread Symbols (See Table 5)
70
lead angle, cross-sectional area at the minor diameter,and the tensile stress area.
11.2 Thread Series
Basic dimensions are given for each of the standardseries threads.
UNIFIED INCH SCREW THREADS ASME B1.1-2003
T
Root
d3 d2d2
d1
D2D1
D
d
dMw
srsfrs
Frs
hds
has
Fcs
fcn
hdn
frn
Frn
hn
Fcn
han
w
hs
Hrrs
scs
scn
Rrn
Rcn
srn
rcs
Maj
or
dia
m.
Pit
ch d
iam
.
Min
or
dia
m.
D1 D2 D3
Maj
or
dia
m.
Pit
ch d
iam
.
Min
or
dia
m.
Axis of external thread
External Thread
Pitch P
90 deg
90 deg
Flan
k
Flan
kPitch line
Pitch line
P/2
2
Root Root
Axis of internal thread
Internal Thread
Base
�
CrestCrest
Crest Crest
�
GENERAL NOTE: These diagrams are not intended to show standard thread forms, but only to illustrate the application ofsymbols.
Fig. 6 Application of General Thread Symbols (See Table 5) (Cont’d)
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Table 6 Basic Dimensions for Coarse-Thread Series (UNC/UNRC)
UNR Design Section atLead AngleMinor Basic Minor Tensile
at BasicBasic Basic Diameter Minor Diameter Stress Area,PitchMajor Pitch External, Diameter at D − 2hb, sq in.
Diameter, �Nominal Size, Diameter, Threads/ Diameter, d3, in. Internal, sq in. [Notes (1),in. D, in. in. D2, in. (Ref.) D1, in. deg Min. [Note (1)] (2)]
1 (0.073) [Note (3)] 0.0730 64 0.0629 0.0544 0.0561 4 31 0.00218 0.002632 (0.086) 0.0860 56 0.0744 0.0648 0.0667 4 22 0.00310 0.003703 (0.099) [Note (3)] 0.0990 48 0.0855 0.0741 0.0764 4 26 0.00406 0.004874 (0.112) 0.1120 40 0.0958 0.0822 0.0849 4 45 0.00496 0.00604
5 (0.125) 0.1250 40 0.1088 0.0952 0.0979 4 11 0.00672 0.007966 (0.138) 0.1380 32 0.1177 0.1008 0.1042 4 50 0.00745 0.009098 (0.164) 0.1640 32 0.1437 0.1268 0.1302 3 58 0.01196 0.014010 (0.190) 0.1900 24 0.1629 0.1404 0.1449 4 39 0.01450 0.017512 (0.216) [Note (3)] 0.2160 24 0.1889 0.1664 0.1709 4 1 0.0206 0.0242
1⁄4 0.2500 20 0.2175 0.1905 0.1959 4 11 0.0269 0.03185⁄16 0.3125 18 0.2764 0.2464 0.2524 3 40 0.0454 0.05243⁄8 0.3750 16 0.3344 0.3005 0.3073 3 24 0.0678 0.07757⁄16 0.4375 14 0.3911 0.3525 0.3602 3 20 0.0933 0.10631⁄2 0.5000 13 0.4500 0.4084 0.4167 3 7 0.1257 0.1419
9⁄16 0.5625 12 0.5084 0.4633 0.4723 2 59 0.162 0.1825⁄8 0.6250 11 0.5660 0.5168 0.5266 2 56 0.202 0.2263⁄4 0.7500 10 0.6850 0.6309 0.6417 2 40 0.302 0.3347⁄8 0.8750 9 0.8028 0.7427 0.7547 2 31 0.419 0.462
1 1.0000 8 0.9188 0.8512 0.8647 2 29 0.551 0.60611⁄8 1.1250 7 1.0322 0.9549 0.9704 2 31 0.693 0.76311⁄4 1.2500 7 1.1572 1.0799 1.0954 2 15 0.890 0.96913⁄8 1.3750 6 1.2667 1.1766 1.1946 2 24 1.054 1.15511⁄2 1.5000 6 1.3917 1.3016 1.3196 2 11 1.294 1.405
13⁄4 1.7500 5 1.6201 1.5119 1.5335 2 15 1.74 1.902 2.0000 41⁄2 1.8557 1.7353 1.7594 2 11 2.30 2.5021⁄4 2.2500 41⁄2 2.1057 1.9853 2.0094 1 55 3.02 3.2521⁄2 2.5000 4 2.3376 2.2023 2.2294 1 57 3.72 4.0023⁄4 2.7500 4 2.5876 2.4523 2.4794 1 46 4.62 4.93
3 3.0000 4 2.8376 2.7023 2.7294 1 36 5.62 5.9731⁄4 3.2500 4 3.0876 2.9523 2.9794 1 29 6.72 7.1031⁄2 3.5000 4 3.3376 3.2023 3.2294 1 22 7.92 8.3333⁄4 3.7500 4 3.5876 3.4523 3.4794 1 16 9.21 9.664 4.0000 4 3.8376 3.7023 3.7294 1 11 10.61 11.08
NOTES:(1) For information only.(2) See formulas in Nonmandatory Appendix B, para. B-1.(3) Secondary sizes.
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UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 7 Basic Dimensions for Fine-Thread Series (UNF/UNRF)
UNR DesignLead AngleMinor Basic Section at
at BasicBasic Diameter Minor Minor TensilePitchBasic Major Pitch External, Diameter Diameter at Stress Area,
Diameter, �Diameter, D, Threads/ Diameter, d3, in. Internal, D − 2hb, sq in. sq in.Nominal Size, in. in. in. D2, in. (Ref.) D1, in. deg Min. [Note (1)] [Notes (1), (2)]
0 (0.060) 0.0600 80 0.0519 0.0451 0.0465 4 23 0.00151 0.001801 (0.073) [Note (3)] 0.0730 72 0.0640 0.0565 0.0580 3 57 0.00237 0.002782 (0.086) 0.0860 64 0.0759 0.0674 0.0691 3 45 0.00339 0.003943 (0.099) [Note (3)] 0.0990 56 0.0874 0.0778 0.0797 3 43 0.00451 0.005234 (0.112) 0.1120 48 0.0985 0.0871 0.0894 3 51 0.00566 0.00661
5 (0.125) 0.1250 44 0.1102 0.0979 0.1004 3 45 0.00716 0.008306 (0.138) 0.1380 40 0.1218 0.1082 0.1109 3 44 0.00874 0.010158 (0.164) 0.1640 36 0.1460 0.1309 0.1339 3 28 0.01285 0.0147410 (0.190) 0.1900 32 0.1697 0.1528 0.1562 3 21 0.0175 0.020012 (0.216) [Note (3)] 0.2160 28 0.1928 0.1734 0.1773 3 22 0.0226 0.0258
1⁄4 0.2500 28 0.2268 0.2074 0.2113 2 52 0.0326 0.03645⁄16 0.3125 24 0.2854 0.2629 0.2674 2 40 0.0524 0.05803⁄8 0.3750 24 0.3479 0.3254 0.3299 2 11 0.0809 0.08787⁄16 0.4375 20 0.4050 0.3780 0.3834 2 15 0.1090 0.11871⁄2 0.5000 20 0.4675 0.4405 0.4459 1 57 0.1486 0.1599
9⁄16 0.5625 18 0.5264 0.4964 0.5024 1 55 0.189 0.2035⁄8 0.6250 18 0.5889 0.5589 0.5649 1 43 0.240 0.2563⁄4 0.7500 16 0.7094 0.6763 0.6823 1 36 0.351 0.3737⁄8 0.8750 14 0.8286 0.7900 0.7977 1 34 0.480 0.509
1 1.0000 12 0.9459 0.9001 0.9098 1 36 0.625 0.66311⁄8 1.1250 12 1.0709 1.0258 1.0348 1 25 0.812 0.85611⁄4 1.2500 12 1.1959 1.1508 1.1598 1 16 1.024 1.07313⁄8 1.3750 12 1.3209 1.2758 1.2848 1 9 1.260 1.31511⁄2 1.5000 12 1.4459 1.4008 1.4098 1 3 1.521 1.581
NOTES:(1) For information only.(2) See formulas in Nonmandatory Appendix B, para. B-1.(3) Secondary sizes.
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Table 8 Basic Dimensions for Extra-Fine-Thread Series (UNEF/UNREF)
UNR DesignLead AngleMinor Basic Section at
at BasicBasic Basic Diameter Minor Minor TensilePitchMajor Pitch External, Diameter Diameter at Stress Area,
Nominal Size, in. Diameter, �Diameter, Threads/ Diameter, d3, in. Internal, D − 2hb, sq in. sq in.Primary Secondary D, in. in. D2, in. (Ref.) D1, in. deg Min. [Note (1)] [Notes (1), (2)]
. . . 12 (0.216) 0.2160 32 0.1957 0.1788 0.1822 2 55 0.0242 0.02701⁄4 . . . 0.2500 32 0.2297 0.2128 0.2162 2 29 0.0344 0.03795⁄16 . . . 0.3125 32 0.2922 0.2753 0.2787 1 57 0.0581 0.06253⁄8 . . . 0.3750 32 0.3547 0.3378 0.3412 1 36 0.0878 0.09327⁄16 . . . 0.4375 28 0.4143 0.3949 0.3988 1 34 0.1201 0.1274
1⁄2 . . . 0.5000 28 0.4768 0.4574 0.4613 1 22 0.162 0.1709⁄16 . . . 0.5625 24 0.5354 0.5129 0.5174 1 25 0.203 0.2145⁄8 . . . 0.6250 24 0.5879 0.5754 0.5799 1 16 0.256 0.268
. . . 11⁄16 0.6875 24 0.6604 0.6379 0.6424 1 9 0.315 0.329
3⁄4 . . . 0.7500 20 0.7175 0.6905 0.6959 1 16 0.369 0.386. . . 13⁄16 0.8125 20 0.7800 0.7530 0.7584 1 10 0.439 0.458
7⁄8 . . . 0.8750 20 0.8425 0.8155 0.8209 1 5 0.515 0.536. . . 15⁄16 0.9375 20 0.9050 0.8780 0.8834 1 0 0.598 0.620
1 . . . 1.0000 20 0.9675 0.9405 0.9459 0 57 0.687 0.711. . . 11⁄16 1.0625 18 1.0264 0.9964 1.0024 0 59 0.770 0.799
11⁄8 . . . 1.1250 18 1.0889 1.0589 1.0649 0 56 0.871 0.901. . . 13⁄16 1.1875 18 1.1514 1.1214 1.1274 0 53 0.977 1.009
11⁄4 . . . 1.2500 18 1.2139 1.1839 1.1899 0 50 1.090 1.123. . . 15⁄16 1.3125 18 1.2764 1.2464 1.2524 0 48 1.208 1.244
13⁄8 . . . 1.3750 18 1.3389 1.3089 1.3149 0 45 1.333 1.370. . . 17⁄16 1.4375 18 1.4014 1.3714 1.3774 0 43 1.464 1.503
11⁄2 . . . 1.5000 18 1.4639 1.4339 1.4399 0 42 1.60 1.64. . . 19⁄16 1.5625 18 1.5264 1.4964 1.5024 0 40 1.74 1.79
15⁄8 . . . 1.6250 18 1.5889 1.5589 1.5649 0 38 1.89 1.94. . . 111⁄16 1.6875 18 1.6514 1.6214 1.6274 0 37 2.05 2.10
NOTES:(1) For information only.(2) See formulas in Nonmandatory Appendix B, para. B-1.
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UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 9 Basic Dimensions for 4-Thread Series (4-UN/4-UNR)
UNR DesignLead AngleMinor Basic Section at
at BasicBasic Basic Diameter Minor Minor TensilePitchMajor Pitch External, Diameter Diameter at Stress Area,
Nominal Size, in. Diameter, �Diameter, Diameter, d3, in. Internal, D − 2hb, sq in. sq in.Primary Secondary D, in. D2, in. (Ref.) D1, in. deg Min. [Note (1)] [Notes (1), (2)]
21⁄2 [Note (3)] . . . 2.5000 2.3376 2.2023 2.2294 1 57 3.72 4.00. . . 25⁄8 2.6250 2.4626 2.3273 2.3544 1 51 4.16 4.45
23⁄4 [Note (3)] . . . 2.7500 2.5876 2.4523 2.4794 1 46 4.62 4.93. . . 27⁄8 2.8750 2.7126 2.5773 2.6044 1 41 5.11 5.44
3 [Note (3)] . . . 3.0000 2.8376 2.7023 2.7294 1 36 5.62 5.97. . . 31⁄8 3.1250 2.9626 2.8273 2.8544 1 32 6.16 6.52
31⁄4 [Note (3)] . . . 3.2500 3.0876 2.9523 2.9794 1 29 6.72 7.10. . . 33⁄8 3.3750 3.2126 3.0773 3.1044 1 25 7.31 7.70
31⁄2 [Note (3)] . . . 3.5000 3.3376 3.2023 3.2294 1 22 7.92 8.33. . . 35⁄8 3.6250 3.4626 3.3273 3.3544 1 19 8.55 9.00
33⁄4 [Note (3)] . . . 3.7500 3.5876 3.4523 3.4794 1 16 9.21 9.66. . . 37⁄8 3.8750 3.7126 3.5773 3.6044 1 14 9.90 10.36
4 [Note (3)] . . . 4.0000 3.8376 3.7023 3.7294 1 11 10.61 11.08. . . 41⁄8 4.1250 3.9626 3.8273 3.8544 1 9 11.34 11.83
41⁄4 . . . 4.2500 4.0876 3.9523 3.9794 1 7 12.10 12.61. . . 43⁄8 4.3750 4.2126 4.0773 4.1044 1 5 12.88 13.41
41⁄2 . . . 4.5000 4.3376 4.2023 4.2294 1 3 13.69 14.23. . . 45⁄8 4.6250 4.4626 4.3273 4.3544 1 1 14.52 15.1
43⁄4 . . . 4.7500 4.5876 4.4523 4.4794 1 0 15.4 15.9. . . 47⁄8 4.8750 4.7126 4.5773 4.6044 0 58 16.3 16.8
5 . . . 5.0000 4.8376 4.7023 4.7294 0 57 17.2 17.8. . . 51⁄8 5.1250 4.9626 4.8273 4.8544 0 55 18.1 18.7
51⁄4 . . . 5.2500 5.0876 4.9523 4.9794 0 54 19.1 19.7. . . 53⁄8 5.3750 5.2126 5.0773 5.1044 0 52 20.0 20.7
51⁄2 . . . 5.5000 5.3376 5.2023 5.2294 0 51 21.0 21.7. . . 55⁄8 5.6250 5.4626 5.3273 5.3544 0 50 22.1 22.7
53⁄4 . . . 5.7500 5.5876 5.4523 5.4794 0 49 23.1 23.8. . . 57⁄8 5.8750 5.7126 5.5773 5.6044 0 48 24.2 24.9
6 . . . 6.0000 5.8376 5.7023 5.7294 0 47 25.3 26.0
NOTES:(1) For information only.(2) See formulas in Nonmandatory Appendix B, para. B-1.(3) Standard sizes of the UNC series.
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Table 10 Basic Dimensions for 6-Thread Series (6-UN/6-UNR)
UNR DesignLead AngleMinor Basic Section at
at BasicBasic Basic Diameter Minor Minor TensilePitchMajor Pitch External, Diameter Diameter at Stress Area,
Nominal Size, in. Diameter, �Diameter, Diameter, d3, in. Internal, D − 2hb, sq in. sq in.Primary Secondary D, in. D2, in. (Ref.) D1, in. deg Min. [Note (1)] [Notes (1), (2)]
13⁄8 [Note (3)] . . . 1.3750 1.2667 1.1766 1.1946 2 24 1.054 1.155. . . 17⁄16 1.4375 1.3292 1.2391 1.2571 2 17 1.171 1.277
11⁄2 [Note (3)] . . . 1.5000 1.3917 1.3016 1.3196 2 11 1.294 1.405. . . 19⁄16 1.5625 1.4542 1.3641 1.3821 2 5 1.423 1.54
15⁄8 . . . 1.6250 1.5167 1.4271 1.4446 2 0 1.56 1.68. . . 111⁄16 1.6875 1.5792 1.4891 1.5071 1 55 1.70 1.83
13⁄4 . . . 1.7500 1.6417 1.5516 1.5696 1 51 1.85 1.98. . . 113⁄16 1.8125 1.7042 1.6141 1.6321 1 47 2.00 2.14
17⁄8 . . . 1.8750 1.7667 1.6766 1.6946 1 43 2.16 2.30. . . 115⁄16 1.9375 1.8292 1.7391 1.7571 1 40 2.33 2.47
2 . . . 2.0000 1.8917 1.8016 1.8196 1 36 2.50 2.65. . . 21⁄8 2.1250 2.0167 1.9266 1.9446 1 30 2.86 3.03
21⁄4 . . . 2.2500 2.1417 2.0516 2.0696 1 25 3.25 3.42. . . 23⁄8 2.3750 2.2667 2.1766 2.1946 1 20 3.66 3.85
21⁄2 . . . 2.5000 2.3917 2.3016 2.3196 1 16 4.10 4.29. . . 25⁄8 2.6250 2.5167 2.4266 2.4446 1 12 4.56 4.76
23⁄4 . . . 2.7500 2.6417 2.5516 2.5696 1 9 5.04 5.26. . . 27⁄8 2.8750 2.7667 2.6766 2.6946 1 6 5.55 5.78
3 . . . 3.0000 2.8917 2.8016 2.8196 1 3 6.09 6.33. . . 31⁄8 3.1250 3.0167 2.9266 2.9446 1 0 6.64 6.89
31⁄4 . . . 3.2500 3.1417 3.0516 3.0696 0 58 7.23 7.49. . . 33⁄8 3.3750 3.2667 3.1766 3.1946 0 56 7.84 8.11
31⁄2 . . . 3.5000 3.3917 3.3016 3.3196 0 54 8.47 8.75. . . 35⁄8 3.6250 3.5167 3.4266 3.4446 0 52 9.12 9.42
33⁄4 . . . 3.7500 3.6417 3.5516 3.5696 0 50 9.81 10.11. . . 37⁄8 3.8750 3.7667 3.6766 3.6946 0 48 10.51 10.83
4 . . . 4.0000 3.8917 3.8016 3.8196 0 47 11.24 11.57. . . 41⁄8 4.1250 4.0167 3.9266 3.9446 0 45 12.00 12.33
41⁄4 . . . 4.2500 4.1417 4.0516 4.0696 0 44 12.78 13.12. . . 43⁄8 4.3750 4.2667 4.1766 4.1946 0 43 13.58 13.94
41⁄2 . . . 4.5000 4.3917 4.3016 4.3196 0 42 14.41 14.78. . . 45⁄8 4.6250 4.5167 4.4266 4.4446 0 40 15.3 15.6
43⁄4 . . . 4.7500 4.6417 4.5516 4.5696 0 39 16.1 16.5. . . 47⁄8 4.8750 4.7667 4.6766 4.6946 0 38 17.0 17.5
5 . . . 5.0000 4.8917 4.8016 4.8196 0 37 18.0 18.4. . . 51⁄8 5.1250 5.0167 4.9266 4.9446 0 36 18.9 19.3
51⁄4 . . . 5.2500 5.1417 5.0516 5.0696 0 35 19.9 20.3. . . 53⁄8 5.3750 5.2667 5.1766 5.1946 0 35 20.9 21.3
51⁄2 . . . 5.5000 5.3917 5.3016 5.3196 0 34 21.9 22.4. . . 55⁄8 5.6250 5.5167 5.4266 5.4446 0 33 23.0 23.4
53⁄4 . . . 5.7500 5.6417 5.5516 5.5696 0 32 24.0 24.5. . . 57⁄8 5.8750 5.7667 5.6766 5.6946 0 32 25.1 25.6
6 . . . 6.0000 5.8917 5.8016 5.8196 0 31 26.3 26.8
NOTES:(1) For information only.(2) See formulas in Nonmandatory Appendix B, para. B-1.(3) Standard sizes of the UNC series.
76
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 11 Basic Dimensions for 8-Thread Series (8-UN/8-UNR)
UNR DesignLead AngleMinor Basic Section at
at BasicBasic Basic Diameter Minor Minor TensilePitchMajor Pitch External, Diameter Diameter at Stress Area,
Nominal Size, in. Diameter, �Diameter, Diameter, d3, in. Internal, D − 2hb, sq in. sq in.Primary Secondary D, in. D2, in. (Ref.) D1, in. deg Min. [Note (1)] [Notes (1), (2)]
1 [Note (3)] . . . 1.0000 0.9188 0.8512 0.8647 2 29 0.551 0.606. . . 11⁄16 1.0625 0.9813 0.9137 0.9272 2 19 0.636 0.695
11⁄8 . . . 1.1250 1.0438 0.9792 0.9897 2 11 0.728 0.790. . . 13⁄16 1.1875 1.1063 1.0387 1.0522 2 4 0.825 0.892
11⁄4 . . . 1.2500 1.1688 1.1012 1.1147 1 57 0.929 1.000. . . 15⁄16 1.3125 1.2313 1.1637 1.1772 1 51 1.039 1.114
13⁄8 . . . 1.3750 1.2938 1.2262 1.2397 1 46 1.155 1.233. . . 17⁄16 1.4375 1.3563 1.2887 1.3022 1 41 1.277 1.360
11⁄2 . . . 1.5000 1.4188 1.3512 1.3647 1 36 1.405 1.492. . . 19⁄16 1.5625 1.4813 1.4137 1.4272 1 32 1.54 1.63
15⁄8 . . . 1.6250 1.5438 1.4806 1.4897 1 29 1.68 1.78. . . 111⁄16 1.6875 1.6063 1.5387 1.5522 1 25 1.83 1.93
13⁄4 . . . 1.7500 1.6688 1.6012 1.6147 1 22 1.98 2.08. . . 113⁄16 1.8125 1.7313 1.6637 1.6772 1 19 2.14 2.25
17⁄8 . . . 1.8750 1.7938 1.7262 1.7397 1 16 2.30 2.41. . . 115⁄16 1.9375 1.8563 1.7887 1.8022 1 14 2.47 2.59
2 . . . 2.0000 1.9188 1.8512 1.8647 1 11 2.65 2.77. . . 21⁄8 2.1250 2.0438 1.9762 1.9897 1 7 3.03 3.15
21⁄4 . . . 2.2500 2.1688 2.1012 2.1147 1 3 3.42 3.56. . . 23⁄8 2.3750 2.2938 2.2262 2.2397 1 0 3.85 3.99
21⁄2 . . . 2.5000 2.4188 2.3512 2.3647 0 57 4.29 4.44. . . 25⁄8 2.6250 2.5438 2.4762 2.4897 0 54 4.76 4.92
23⁄4 . . . 2.7500 2.6688 2.6012 2.6147 0 51 5.26 5.43. . . 27⁄8 2.8750 2.7938 2.7262 2.7397 0 49 5.78 5.95
3 . . . 3.0000 2.9188 2.8512 2.8647 0 47 6.32 6.51. . . 31⁄8 3.1250 3.0438 2.9762 2.9897 0 45 6.89 7.08
31⁄4 . . . 3.2500 3.1688 3.1012 3.1147 0 43 7.49 7.69. . . 33⁄8 3.3750 3.2938 3.2262 3.2397 0 42 8.11 8.31
31⁄2 . . . 3.5000 3.4188 3.3512 3.3647 0 40 8.75 8.96. . . 35⁄8 3.6250 3.5438 3.4762 3.4897 0 39 9.42 9.64
33⁄4 . . . 3.7500 3.6688 3.6012 3.6147 0 37 10.11 10.34. . . 37⁄8 3.8750 3.7938 3.7262 3.7397 0 36 10.83 11.06
4 . . . 4.0000 3.9188 3.8512 3.8647 0 35 11.57 11.81. . . 41⁄8 4.1250 4.0438 3.9762 3.9897 0 34 12.34 12.59
41⁄4 . . . 4.2500 4.1688 4.1012 4.1147 0 33 13.12 13.38. . . 43⁄8 4.3750 4.2938 4.2262 4.2397 0 32 13.94 14.21
41⁄2 . . . 4.5000 4.4188 4.3512 4.3647 0 31 14.78 15.1. . . 45⁄8 4.6250 4.5438 4.4762 4.4897 0 30 15.6 15.9
43⁄4 . . . 4.7500 4.6688 4.6012 4.6147 0 29 16.5 16.8. . . 47⁄8 4.8750 4.7938 4.7262 4.7397 0 29 17.4 17.7
5 . . . 5.0000 4.9188 4.8512 4.8647 0 28 18.4 18.7. . . 51⁄8 5.1250 5.0438 4.9762 4.9897 0 27 19.3 19.7
51⁄4 . . . 5.2500 5.1688 5.1012 5.1147 0 26 20.3 20.7. . . 53⁄8 5.3750 5.2938 5.2262 5.2397 0 26 21.3 21.7
77
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 11 Basic Dimensions for 8-Thread Series (8-UN/8-UNR) (Cont’d)
UNR DesignLead AngleMinor Basic Section at
at BasicBasic Basic Diameter Minor Minor TensilePitchMajor Pitch External, Diameter Diameter at Stress Area,
Nominal Size, in. Diameter, �Diameter, Diameter, d3, in. Internal, D − 2hb, sq in. sq in.Primary Secondary D, in. D2, in. (Ref.) D1, in. deg Min. [Note (1)] [Notes (1), (2)]
51⁄2 . . . 5.5000 5.4188 5.3512 5.3647 0 25 22.4 22.7. . . 55⁄8 5.6250 5.5438 5.4762 5.4897 0 25 23.4 23.8
53⁄4 . . . 5.7500 5.6688 5.6012 5.6147 0 24 24.5 24.9. . . 57⁄8 5.8750 5.7938 5.7262 5.7397 0 24 25.6 26.0
6 . . . 6.0000 5.9188 5.8512 5.8647 0 23 26.8 27.1
NOTES:(1) For information only.(2) See formulas in Nonmandatoray Appendix B, para. B-1.(3) Standard size of the UNC series.
78
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 12 Basic Dimensions for 12-Thread Series (12-UN/12-UNR)
UNR DesignLead AngleMinor Basic Section at
at BasicBasic Basic Diameter Minor Minor TensilePitchMajor Pitch External, Diameter Diameter at Stress Area,
Nominal Size, in. Diameter, �Diameter, Diameter, d3, in. Internal, D − 2hb, sq in. sq in.Primary Secondary D, in. D2, in. (Ref.) D1, in. deg Min. [Note (1)] [Notes (1), (2)]
9⁄16 [Note (3)] . . . 0.5625 0.5084 0.4633 0.4723 2 59 0.162 0.1825⁄8 . . . 0.6250 0.5709 0.5258 0.5348 2 40 0.210 0.232
. . . 11⁄16 0.6875 0.6334 0.5883 0.5973 2 24 0.264 0.289
3⁄4 . . . 0.7500 0.6959 0.6508 0.6598 2 11 0.323 0.351. . . 13⁄16 0.8125 0.7584 0.7133 0.7223 2 0 0.390 0.420
7⁄8 . . . 0.8750 0.8209 0.7758 0.7848 1 51 0.462 0.495. . . 15⁄16 0.9375 0.8834 0.8383 0.8473 1 43 0.540 0.576
1 [Note (3)] . . . 1.0000 0.9459 0.9008 0.9098 1 36 0.625 0.663. . . 11⁄16 1.0625 1.0084 0.9633 0.9723 1 30 0.715 0.756
11⁄8 [Note (3)] . . . 1.1250 1.0709 1.0258 1.0348 1 25 0.812 0.856. . . 13⁄16 1.1875 1.1334 1.0883 1.0973 1 20 0.915 0.961
11⁄4 [Note (3)] . . . 1.2500 1.1959 1.1508 1.1598 1 16 1.024 1.073. . . 15⁄16 1.3125 1.2584 1.2133 1.2223 1 12 1.139 1.191
13⁄8 [Note (3)] . . . 1.3750 1.3209 1.2758 1.2848 1 9 1.260 1.315. . . 17⁄16 1.4375 1.3834 1.3383 1.3473 1 6 1.388 1.445
11⁄2 [Note (3)] . . . 1.5000 1.4459 1.4008 1.4098 1 3 1.52 1.58. . . 19⁄16 1.5625 1.5084 1.4633 1.4723 1 0 1.66 1.72
15⁄8 . . . 1.6250 1.5709 1.5258 1.5348 0 58 1.81 1.87. . . 111⁄16 1.6875 1.6334 1.5883 1.5973 0 56 1.96 2.03
13⁄4 . . . 1.7500 1.6959 1.6508 1.6598 0 54 2.12 2.19. . . 113⁄16 1.8125 1.7584 1.7133 1.7223 0 52 2.28 2.35
17⁄8 . . . 1.8750 1.8209 1.7758 1.7848 0 50 2.45 2.53. . . 115⁄16 1.9375 1.8834 1.8383 1.8473 0 48 2.63 2.71
2 . . . 2.0000 1.9459 1.9008 1.9098 0 47 2.81 2.89. . . 21⁄8 2.1250 2.0709 2.0258 2.0348 0 44 3.19 3.28
21⁄4 . . . 2.2500 2.1959 2.1508 2.1598 0 42 3.60 3.69. . . 23⁄8 2.3750 2.3209 2.2758 2.2848 0 39 4.04 4.13
21⁄2 . . . 2.5000 2.4459 2.4008 2.4098 0 37 4.49 4.60. . . 25⁄8 2.6250 2.5709 2.5258 2.5348 0 35 4.97 5.08
23⁄4 . . . 2.7500 2.6959 2.6508 2.6598 0 34 5.48 5.59. . . 27⁄8 2.8750 2.8209 2.7758 2.7848 0 32 6.01 6.13
3 . . . 3.0000 2.9459 2.9008 2.9098 0 31 6.57 6.69. . . 31⁄8 3.1250 3.0709 3.0258 3.0348 0 30 7.15 7.28
31⁄4 . . . 3.2500 3.1959 3.1508 3.1598 0 29 7.75 7.89. . . 33⁄8 3.3750 3.3209 3.2758 3.2848 0 27 8.38 8.52
31⁄2 . . . 3.5000 3.4459 3.4008 3.4098 0 26 9.03 9.18. . . 35⁄8 3.6250 3.5709 3.5258 3.5348 0 26 9.71 9.86
33⁄4 . . . 3.7500 3.6959 3.6508 3.6598 0 25 10.42 10.57. . . 37⁄8 3.8750 3.8209 3.7758 3.7848 0 24 11.14 11.30
4 . . . 4.0000 3.9459 3.9008 3.9098 0 23 11.90 12.06. . . 41⁄8 4.1250 4.0709 4.0258 4.0348 0 22 12.67 12.84
41⁄4 . . . 4.2500 4.1959 4.1508 4.1598 0 22 13.47 13.65. . . 43⁄8 4.3750 4.3209 4.2758 4.2848 0 21 14.30 14.48
79
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 12 Basic Dimensions for 12-Thread Series (12-UN/12-UNR) (Cont’d)
UNR DesignLead AngleMinor Basic Section at
at BasicBasic Basic Diameter Minor Minor TensilePitchMajor Pitch External, Diameter Diameter at Stress Area,
Nominal Size, in. Diameter, �Diameter, Diameter, d3, in. Internal, D − 2hb, sq in. sq in.Primary Secondary D, in. D2, in. (Ref.) D1, in. deg Min. [Note (1)] [Notes (1), (2)]
41⁄2 . . . 4.5000 4.4459 4.4008 4.4098 0 21 15.1 15.3. . . 45⁄8 4.6250 4.5709 4.5258 4.5348 0 20 16.0 16.2
43⁄4 . . . 4.7500 4.6959 4.6508 4.6598 0 19 16.9 17.1. . . 47⁄8 4.8750 4.8209 4.7758 4.7848 0 19 17.8 18.0
5 . . . 5.0000 4.9459 4.9008 4.9098 0 18 18.8 19.0. . . 51⁄8 5.1250 5.0709 5.0258 5.0348 0 18 19.8 20.0
51⁄4 . . . 5.2500 5.1959 5.1508 5.1598 0 18 20.8 21.0. . . 53⁄8 5.3750 5.3209 5.2758 5.2848 0 17 21.8 22.0
51⁄2 . . . 5.5000 5.4459 5.4008 5.4098 0 17 22.8 23.1. . . 55⁄8 5.6250 5.5709 5.5258 5.5348 0 16 23.9 24.1
53⁄4 . . . 5.7500 5.6959 5.6508 5.6598 0 16 25.0 25.2. . . 57⁄8 5.8750 5.8209 5.7758 5.7848 0 16 26.1 26.4
6 . . . 6.0000 5.9459 5.9008 5.9098 0 15 27.3 27.5
NOTES:(1) For information only.(2) See formulas in Nonmandatory Appendix B, para. B-1.(3) Standard sizes of the UNC or UNF series.
80
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 13 Basic Dimensions for 16-Thread Series (16-UN/16-UNR)
UNR DesignLead AngleMinor Basic Section at
at BasicBasic Basic Diameter Minor Minor TensilePitchMajor Pitch External, Diameter Diameter at Stress Area,
Nominal Size, in. Diameter, �Diameter, Diameter, d3, in. Internal, D − 2hb, sq in. sq in.Primary Secondary D, in. D2, in. (Ref.) D1, in. deg Min. [Note (1)] [Notes (1), (2)]
3⁄8 [Note (3)] . . . 0.3750 0.3344 0.3005 0.3073 3 24 00678 0.07757⁄16 . . . 0.4375 0.3969 0.3630 0.3698 2 52 0.0997 0.11141⁄2 . . . 0.5000 0.4594 0.4255 0.4323 2 29 0.1378 0.1519⁄16 . . . 0.5625 0.5219 0.4880 0.4948 2 11 0.182 0.1985⁄8 . . . 0.6250 0.5844 0.5505 0.5573 1 57 0.232 0.250
. . . 11⁄16 0.6875 0.6469 0.6130 0.6198 1 46 0.289 0.308
3⁄4 [Note (3)] . . . 0.7500 0.7094 0.6755 0.6823 1 36 0.351 0.373. . . 13⁄16 0.8125 0.7719 0.7380 0.7448 1 29 0.420 0.444
7⁄8 . . . 0.8750 0.8344 0.8005 0.8073 1 22 0.495 0.521. . . 15⁄16 0.9375 0.8969 0.8630 0.8698 1 16 0.576 0.604
1 . . . 1.0000 0.9594 0.9255 0.9323 1 11 0.663 0.693. . . 11⁄16 1.0625 1.0219 0.9880 0.9948 1 7 0.756 0.788
11⁄8 . . . 1.1250 1.0844 1.0505 1.0573 1 3 0.856 0.889. . . 13⁄16 1.1875 1.1469 1.1130 1.1198 1 0 0.961 0.997
11⁄4 . . . 1.2500 1.2094 1.1755 1.1823 0 57 1.073 1.111. . . 15⁄16 1.3125 1.2719 1.2380 1.2448 0 54 1.191 1.230
13⁄8 . . . 1.3750 1.3344 1.3005 1.3073 0 51 1.315 1.356. . . 17⁄16 1.4375 1.3969 1.3630 1.3698 0 49 1.445 1.488
11⁄2 . . . 1.5000 1.4594 1.4255 1.4323 0 47 1.58 1.63. . . 19⁄16 1.5625 1.5219 1.4880 1.4948 0 45 1.72 1.77
15⁄8 . . . 1.6250 1.5844 1.5505 1.5573 0 43 1.87 1.92. . . 111⁄16 1.6875 1.6469 1.6130 1.6198 0 42 2.03 2.08
13⁄4 . . . 1.7500 1.7094 1.6755 1.6823 0 40 2.19 2.24. . . 113⁄16 1.8125 1.7719 1.7380 1.7448 0 39 2.35 2.41
17⁄8 . . . 1.8750 1.8344 1.8005 1.8073 0 37 2.53 2.58. . . 115⁄16 1.9375 1.8969 1.8630 1.8698 0 36 2.71 2.77
2 . . . 2.0000 1.9594 1.9255 1.9323 0 35 2.89 2.95. . . 21⁄8 2.1250 2.0844 2.0505 2.0573 0 33 3.28 3.35
21⁄4 . . . 2.2500 2.2094 2.1755 2.1823 0 31 3.69 3.76. . . 23⁄8 2.3750 2.3344 2.3005 2.3073 0 29 4.13 4.21
21⁄2 . . . 2.5000 2.4594 2.4255 2.4323 0 28 4.60 4.67. . . 25⁄8 2.6250 2.5844 2.5505 2.5573 0 26 5.08 5.16
23⁄4 . . . 2.7500 2.7094 2.6755 2.6823 0 25 5.59 5.68. . . 27⁄8 2.8750 2.8344 2.8005 2.8073 0 24 6.13 6.22
3 . . . 3.0000 2.9594 2.9255 2.9323 0 23 6.69 6.78. . . 31⁄8 3.1250 3.0844 3.0505 3.0573 0 22 7.28 7.37
31⁄4 . . . 3.2500 3.2094 3.1755 3.1823 0 21 7.89 7.99. . . 33⁄8 3.3750 3.3344 3.3005 3.3073 0 21 8.52 8.63
31⁄2 . . . 3.5000 3.4594 3.4255 3.4323 0 20 9.18 9.29. . . 35⁄8 3.6250 3.5844 3.5505 3.5573 0 19 9.86 9.98
33⁄4 . . . 3.7500 3.7094 3.6755 3.6823 0 18 10.57 10.69. . . 37⁄8 3.8750 3.8344 3.8005 3.8073 0 18 11.30 11.43
81
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 13 Basic Dimensions for 16-Thread Series (16-UN/16-UNR) (Cont’d)
UNR DesignLead AngleMinor Basic Section at
at BasicBasic Basic Diameter Minor Minor TensilePitchMajor Pitch External, Diameter Diameter at Stress Area,
Nominal Size, in. Diameter, �Diameter, Diameter, d3, in. Internal, D − 2hb, sq in. sq in.Primary Secondary D, in. D2, in. (Ref.) D1, in. deg Min. [Note (1)] [Notes (1), (2)]
4 . . . 4.0000 3.9594 3.9255 3.9323 0 17 12.06 12.19. . . 41⁄8 4.1250 4.0844 4.0505 4.0573 0 17 12.84 12.97
41⁄4 . . . 4.2500 4.2094 4.1755 4.1823 0 16 13.65 13.78. . . 43⁄8 4.3750 4.3344 4.3005 4.3073 0 16 14.48 14.62
41⁄2 . . . 4.5000 4.4594 4.4255 4.4323 0 15 15.34 15.5. . . 45⁄8 4.6250 4.5844 4.5505 4.5573 0 15 16.2 16.4
43⁄4 . . . 4.7500 4.7094 4.6755 4.6823 0 15 17.1 17.3. . . 47⁄8 4.8750 4.8344 4.8005 4.8073 0 14 18.0 18.2
5 . . . 5.0000 4.9594 4.9255 4.9323 0 14 19.0 19.2. . . 51⁄8 5.1250 5.0844 5.0505 5.0573 0 13 20.0 20.1
51⁄4 . . . 5.2500 5.2094 5.1755 5.1823 0 13 21.0 21.1. . . 53⁄8 5.3750 5.3344 5.3005 5.3073 0 13 22.0 22.2
51⁄2 . . . 5.5000 5.4594 5.4255 5.4323 0 13 23.1 23.2. . . 55⁄8 5.6250 5.5844 5.5505 5.5573 0 12 24.1 24.3
53⁄4 . . . 5.7500 5.7094 5.6755 5.6823 0 12 25.2 25.4. . . 57⁄8 5.8750 5.8344 5.8005 5.8073 0 12 26.4 26.5
6 . . . 6.0000 5.9594 5.9255 5.9323 0 11 27.5 27.7
NOTES:(1) For information only.(2) See formulas in Nonmandatory Appendix B, para. B-1.(3) Standard sizes of the UNC or UNF series.
82
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 14 Basic Dimensions for 20-Thread Series (20-UN/20-UNR)
UNR DesignLead AngleMinor Basic Section at
at BasicBasic Basic Diameter Minor Minor TensilePitchMajor Pitch External, Diameter Diameter at Stress Area,
Nominal Size, in. Diameter, �Diameter, Diameter, d3, in. Internal, D − 2hb, sq in. sq in.Primary Secondary D, in. D2, in. (Ref.) D1, in. deg Min. [Note (1)] [Notes (1), (2)]
1⁄4 [Note (3)] . . . 0.2500 0.2175 0.1905 0.1959 4 11 0.0269 0.03185⁄16 . . . 0.3125 0.2800 0.2530 0.2584 3 15 0.0481 0.05473⁄8 . . . 0.3750 0.3425 0.3155 0.3209 2 40 0.0755 0.08367⁄16 [Note (3)] . . . 0.4375 0.4050 0.3780 0.3834 2 15 0.1090 0.1187
1⁄2 [Note (3)] . . . 0.5000 0.4675 0.4405 0.4459 1 57 0.1486 0.1609⁄16 . . . 0.5625 0.5300 0.5030 0.5084 1 43 0.194 0.2075⁄8 . . . 0.6250 0.5925 0.5655 0.5709 1 32 0.246 0.261
. . . 11⁄16 0.6875 0.6550 0.6280 0.6334 1 24 0.304 0.320
3⁄4 [Note (3)] . . . 0.7500 0.7175 0.6905 0.6959 1 16 0.369 0.386. . . 13⁄16 0.8125 0.7800 0.7530 0.7584 1 10 0.439 0.458
[Note (3)]7⁄8 [Note (3)] . . . 0.8750 0.8425 0.8155 0.8209 1 5 0.515 0.536
. . . 15⁄16 0.9375 0.9050 0.8780 0.8834 1 0 0.598 0.620[Note (3)]
1 [Note (3)] . . . 1.0000 0.9675 0.9405 0.9459 0 57 0.687 0.711. . . 11⁄16 1.0625 1.0300 1.0030 1.0084 0 53 0.782 0.807
11⁄8 . . . 1.1250 1.0925 1.0655 1.0709 0 50 0.882 0.910. . . 13⁄16 1.1875 1.1550 1.1280 1.1334 0 47 0.990 1.018
11⁄4 . . . 1.2500 1.2175 1.1905 1.1959 0 45 1.103 1.133. . . 15⁄16 1.3125 1.2800 1.2530 1.2584 0 43 1.222 1.254
13⁄8 . . . 1.3750 1.3425 1.3155 1.3209 0 41 1.348 1.382. . . 7⁄16 1.4375 1.4050 1.3780 1.3834 0 39 1.479 1.51
11⁄2 . . . 1.5000 1.4675 1.4405 1.4459 0 37 1.62 1.65. . . 19⁄16 1.5625 1.5300 1.5030 1.5084 0 36 1.76 1.80
15⁄8 . . . 1.6250 1.5925 1.5655 1.5709 0 34 1.91 1.95. . . 111⁄16 1.6875 1.6550 1.6280 1.6334 0 33 2.07 2.11
13⁄4 . . . 1.7500 1.7175 1.6905 1.6959 0 32 2.23 2.27. . . 113⁄16 1.8125 1.7800 1.7530 1.7584 0 31 2.40 2.44
17⁄8 . . . 1.8750 1.8425 1.8155 1.8209 0 30 2.57 2.62. . . 115⁄16 1.9375 1.9050 1.8780 1.8834 0 29 2.75 2.80
2 . . . 2.0000 1.9675 1.9405 1.9459 0 28 2.94 2.99. . . 21⁄8 2.1250 2.0925 2.0655 2.0709 0 26 3.33 3.39
21⁄4 . . . 2.2500 2.2175 2.1905 2.1959 0 25 3.75 3.81. . . 23⁄8 2.3750 2.3425 2.3155 2.3209 0 23 4.19 4.25
21⁄2 . . . 2.5000 2.4675 2.4405 2.4459 0 22 4.66 4.72. . . 25⁄8 2.6250 2.5925 2.5655 2.5709 0 21 5.15 5.21
23⁄4 . . . 2.7500 2.7175 2.6905 2.6959. 0 20 5.66 5.73. . . 27⁄8 2.8750 2.8425 2.8155 2.8209 0 19 6.20 6.27
3 . . . 3.0000 2.9675 2.9405 2.9459 0 18 6.77 6.84
NOTES:(1) For information only.(2) See formulas in Nonmandatory Appendix B, para. B-1.(3) Standard sizes of the UNC, UNF, or UNEF series.
83
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 15 Basic Dimensions for 28-Thread Series (28-UN/28-UNR)
Lead AngleUNR Designat BasicMinor Basic Section at
PitchBasic Basic Diameter Minor Minor TensileDiameter,Major Pitch External, Diameter Diameter at Stress Area,
Nominal Size, in. �Diameter, Diameter, d3, in. Internal D − 2hb, sq in. sq in.Primary Secondary D, in. D2, in. (Ref.) D1, in. deg Min. [Note (1)] [Notes (1), (2)]
. . . 12 (0.216) 0.2160 0.1928 0.1734 0.1773 3 22 0.0226 0.0258[Note (3)]
1⁄4 [Note (3)] . . . 0.2500 0.2268 0.2074 0.2113 2 52 0.0326 0.03645⁄16 . . . 0.3125 0.2893 0.2699 0.2738 2 15 0.0556 0.06063⁄8 . . . 0.3750 0.3518 0.3324 0.3363 1 51 0.0848 0.09097⁄16 [Note (3)] . . . 0.4375 0.4143 0.3949 0.3988 1 34 0.1201 0.1274
1⁄2 [Note (3)] . . . 0.5000 0.4768 0.4574 0.4613 1 22 0.162 0.1709⁄16 . . . 0.5625 0.5393 0.5199 0.5238 1 12 0.209 0.2195⁄8 . . . 0.6250 0.6018 0.5824 0.5863 1 5 0.263 0.274
. . . 11⁄16 0.6875 0.6643 0.6449 0.6488 0 59 0.323 0.335
3⁄4 . . . 0.7500 0.7268 0.7074 0.7113 0 54 0.389 0.402. . . 13⁄16 0.8125 0.7893 0.7699 0.7738 0 50 0.461 0.475
7⁄8 . . . 0.8750 0.8518 0.8324 0.8363 O 46 0.539 0.554. . . 15⁄16 0.9375 0.9143 0.8949 0.8988 O 43 0.624 0.640
1 . , . 1.0000 0.9768 0.9574 0.9613 O 40 0.714 0.732. . . 11⁄16 1.0625 1.0393 1.0199 1.0238 O 38 0.811 0.830
11⁄8 . . . 1.1250 1.1018 1.0824 1.0863 O 35 0.914 0.933. . . 13⁄16 1.1875 1.1643 1.1449 1.1488 O 34 1.023 1.044
11⁄4 . . . 1.2500 1.2268 1.2074 1.2113 O 32 1.138 1.160. . . 15⁄16 1.3125 1.2893 1.2699 1.2738 O 30 1.259 1.282
13⁄8 . . . 1.3750 1.3518 1.3324 1.3363 O 29 1.386 1.411. . . 17⁄16 1.4375 1.4143 1.3949 1.3988 O 28 1.52 1.55
11⁄2 . . . 1.5000 1.4768 1.4574 1.4613 0 26 1.66 1.69
NOTES:(1) For information only.(2) See formulas in Nonmandatory Appendix B, para. B-1.(3) Standard sizes of the UNF or UNEF series.
84
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 16 Basic Dimensions for 32-Thread Series (32-UN/32-UNR)
Lead AngleUNR Designat BasicMinor Basic Section at
PitchBasic Basic Diameter Minor Minor TensileDiameter,Major Pitch External, Diameter Diameter at Stress Area,
Nominal Size, in. �Diameter, Diameter, d3, in. Internal, D − 2hb, sq in. sq in.Primary Secondary D, in. D2, in. (Ref.) D1, in. deg Min. [Note (1)] [Notes (1), (2)]
6 (0.138) [Note (3)] . . . 0.1380 0.1177 0.1008 0.1042 4 50 0.00745 0.009098 (0.164) [Note (3)] . . . 0.1640 0.1437 0.1268 0.1302 3 58 0.01196 0.0140
10 (0.190) [Note (3)] . . . 0.1900 0.1697 0.1528 0.1562 3 21 0.01750 0.0200. . . 12 (0.216) 0.2160 0.1957 0.1788 0.1822 2 55 0.0242 0.0270
[Note (3)]
1⁄4 [Note (3)] . . . 0.2500 0.2297 0.2128 0.2162 2 29 0.0344 0.03795⁄16 [Note (3)] . . . 0.3125 0.2922 0.2753 0.2787 1 57 0.0581 0.06253⁄8 [Note (3)] . . . 0.3750 0.3547 0.3378 0.3412 1 36 0.0878 0.09327⁄16 . . . 0.4375 0.4172 0.4003 0.4037 1 22 0.1237 0.1301
1⁄2 . . . 0.5000 0.4797 0.4628 0.4662 1 11 0.166 0.1739⁄16 . . . 0.5625 0.5422 0.5253 0.5287 1 3 0.214 0.2225⁄8 . . . 0.6250 0.6047 0.5878 0.5912 0 57 0.268 0.278
. . . 11⁄16 0.6875 0.6672 0.6503 0.6537 0 51 0.329 0.339
3⁄4 . . . 0.7500 0.7297 0.7128 0.7162 0 47 0.395 0.407. . . 13⁄16 0.8125 0.7922 0.7753 0.7787 0 43 0.468 0.480
7⁄8 . . . 0.8750 0.8547 0.8378 0.8412 0 40 0.547 0.560. . . 15⁄16 0.9375 0.9172 0.9003 0.9037 0 37 0.632 0.646
1 . . . 1.0000 0.9797 0.9628 0.9662 0 35 0.723 0.738
NOTES:(1) For information only.(2) See formulas in Nonmandatory Appendix B, para. B-1.(3) Standard sizes of the UNC, UNF, or UNEF series.
85
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 17A Outline Guide for Determining Limits of Size of External Threads
Major Diameter, d Pitch Diameter, d2ThreadClass Max. Min. Max. Min. Minor Diameter, d1
1A Nominal size Maximum, Maximum major Maximum, See paras. 8.3.1(e) and (f).minus allowance minus tolerance diameter minus hb minus tolerance Established by crest of
(Table 5, col. 13) new tool and minimumminor diameter of GOthread gage.
2A Nominal size Maximum, Maximum major Maximum, See paras. 8.3.1(e) and (f).minus allowance minus tolerance diameter minus hb minus tolerance Established by crest of
(Table 5, col. 13) new tool and minimumminor diameter of GOthread gage.
3A Nominal size Maximum, Maximum major Maximum, See paras. 8.3.1(e) and (f).minus tolerance diameter minus hb minus tolerance Established by crest of
(Table 5, col. 13) new tool and minimumminor diameter of GOthread gage.
Table 17B Outline Guide for Determining Limits of Size of Internal Threads
Minor Diameter, D1 Pitch Diameter, D2ThreadClass Min. Max. Min. Max. Major Diameter, D
1B Nominal size minus 2hn Minimum, plus Nominal size minus hb Minimum, See paras. 8.3.2(a) and (b).(Table 5, col. 15) tolerance (Table 5, col. 13) plus tolerance Established by crest of
new tool and maximummajor diameter of GOthread gage.
2B Nominal size minus 2hn Minimum, plus Nominal size minus hb Minimum, See paras. 8.3.2(a) and (b).(Table 5, col. 15) tolerance (Table 5, col. 13) plus tolerance Established by crest of
new tool and maximummajor diameter of GOthread gage.
3B Nominal size minus 2hn Minimum, plus Nominal size minus hb Minimum, See paras. 8.3.2(a) and (b).(Table 5, col. 15) tolerance (Table 5, col. 13) plus tolerance Established by crest of
new tool and maximummajor diameter of GOthread gage.
86
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e18
AEx
ampl
esof
Exte
rnal
Scre
wTh
read
s
Thre
adS
izep
1 ⁄ 2–
28or
0.50
00–
28U
NEF
-2A
Char
acte
rist
icD
escr
ipti
onEx
ampl
eof
Siz
eCa
lcul
atio
nA
ddit
iona
lIn
form
atio
n
(1)
Max
imum
exte
rnal
maj
ordi
amet
er(d
max
.)d
max
.pd
bsc
−es
...
pB
asic
maj
ordi
amet
er(d
bsc)
–al
low
ance
(es)
dbs
cp
0.50
00Th
isis
the
final
valu
eof
the
basi
cm
ajor
diam
eter
whi
chis
roun
ded
tofo
urde
cim
alpl
aces
.es
p0.
300
(Td 2
for
Clas
s2A
)Fo
rth
eCl
ass
2Api
tch
diam
e-te
rto
lera
nce,
see
Tabl
e18
A,
(4).
esp
0.30
0(0
.003
668)
The
six
deci
mal
plac
eva
lue
for
Clas
s2A
pitc
hdi
amet
erto
lera
nce
(Td 2
)is
used
inth
isca
lcul
atio
n.es
p0.
0011
00Th
isfig
ure
isro
unde
dto
four
deci
mal
plac
esto
obta
inth
efin
alva
lue
ofes
.es
p0.
0011
...
dm
ax.p
0.50
00−
0.00
11..
.d
max
.p0.
4989
...
(2)
Min
imum
exte
rnal
maj
ordi
amet
er(d
min
.)d
min
.pd
max
.−Td
...
pM
axim
umex
tern
alm
ajor
diam
eter
(dm
ax.)
–m
ajor
diam
eter
tole
ranc
e(T
d)Td
p0.
060
3 �P2
...
Tdp
0.06
03 �(
0.03
5714
29)2
All
thre
adca
lcul
atio
nsar
eto
bepe
rfor
med
usin
g(P
)ro
unde
dto
eigh
tde
cim
alpl
aces
.Td
p0.
060
3 �0.0
0127
6..
.Td
p0.
060
(0.1
0846
3)..
.Td
p0.
0065
08Th
isfig
ure
isro
unde
dto
four
deci
mal
plac
esto
obta
inth
efin
alva
lue
ofTd
.Td
p0.
0065
...
dm
in.p
0.49
89−
0.00
65..
.d
min
.p0.
4924
...
87
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e18
AEx
ampl
esof
Exte
rnal
Scre
wTh
read
s(C
ont’
d)
Thre
adS
izep
1 ⁄ 2–
28or
0.50
00–
28U
NEF
-2A
Char
acte
rist
icD
escr
ipti
onEx
ampl
eof
Siz
eCa
lcul
atio
nA
ddit
iona
lIn
form
atio
n
(3)
Max
imum
exte
rnal
pitc
hdi
amet
er(d
2m
ax.)
d 2m
ax.p
dm
ax.−
2has
...
pM
axim
umex
tern
alm
ajor
diam
eter
(dm
ax.)
−tw
ice
the
2has
p0.
6495
1905
P..
.ex
tern
alth
read
adde
ndum
(2h a
s)2h
asp
0.64
9519
05(0
.035
7142
9)A
llth
read
calc
ulat
ions
are
tobe
perf
orm
edus
ing
(P)
roun
ded
toei
ght
deci
mal
plac
es.
2has
p0.
0231
97..
.d 2
max
.p0.
4989
−0.
0231
97..
.d 2
max
.p0.
4757
03Th
isfig
ure
isro
unde
dto
four
deci
mal
plac
esto
obta
inth
efin
alva
lue
ofd 2
max
.d 2
max
.p0.
4757
...
(4)
Min
imum
exte
rnal
pitc
hdi
amet
er(d
2m
in.)
d 2m
in.p
d 2m
ax.−
Td2
...
pM
axim
umex
tern
alpi
tch
diam
eter
(d2
max
.)–
exte
rnal
pitc
hdi
amet
erto
lera
nce
(Td 2
)Td
2p
0.00
153 �d
bsc
+0.
0015
�LE
+0.
015
3 �P2
LE(l
engt
hof
enga
gem
ent)
requ
ired
inth
isex
ampl
e,is
equa
lto
9P.
See
para
.5.
2fo
rLE
appl
icat
ions
for
othe
rth
read
seri
es.
Td2
p0.
0015
3 �0.5
000
+0.
0015
�9(0
.035
7142
9)+
0.01
53 �(
0.03
5714
29)2
...
Td2
p0.
0015
3 �0.5
000
+0.
0015
�0.
3214
29+
0.01
53 �0
.001
276
...
Td2
p(0
.001
5)(0
.793
701)
+(0
.001
5)(0
.566
947)
+(0
.015
)(0
.108
463)
...
Td2
p0.
0011
91+
0.00
0850
+0.
0016
27..
.Td
2p
0.00
3668
This
figur
eis
roun
ded
tosi
xde
cim
alpl
aces
toob
tain
the
final
valu
eof
the
exte
r-na
lpi
tch
diam
eter
tole
ranc
eTd
2.d 2
min
.p0.
4757
−0.
0036
68..
.d 2
min
.p0.
4720
32Th
isfig
ure
isro
unde
dto
four
deci
mal
plac
esto
obta
inth
efin
alva
lue
ofd 2
min
.d 2
min
.p0.
4720
...
88
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e18
AEx
ampl
esof
Exte
rnal
Inch
Scre
wTh
read
s,(C
ont’
d)
Thre
adS
izep
1 ⁄ 2–
28or
0.50
00–
28U
NEF
-2A
Char
acte
rist
icD
escr
ipti
onEx
ampl
eof
Siz
eCa
lcul
atio
nA
ddit
iona
lIn
form
atio
n
(5)
Max
imum
exte
rnal
UN
Rm
inor
diam
eter
(d3
max
.)d 3
max
.pd
max
.−2h
s..
.p
Max
imum
exte
rnal
maj
ordi
amet
er(d
max
.)–
doub
lehe
ight
2hsp
1.19
0784
93P
...
ofex
tern
alU
NR
thre
ad(2
h s)
2hsp
1.19
0784
93(0
.035
7142
9)A
llth
read
calc
ulat
ions
are
tobe
perf
orm
edus
ing
(P)
roun
ded
toei
ght
deci
mal
plac
es.
2hsp
0.04
2528
...
d 3m
ax.p
0.49
89−
0.04
2528
...
d 3m
ax.p
0.45
6372
This
figur
eis
roun
ded
tofo
urde
cim
alpl
aces
toob
tain
the
final
valu
eof
d 3m
ax.
d 3m
ax.p
0.45
64..
.
(6)
Max
imum
exte
rnal
UN
min
ordi
amet
er(d
1m
ax.)
d 1m
ax.p
dm
ax.−
2hs
...
pM
axim
umex
tern
alm
ajor
diam
eter
(dm
ax.)
–do
uble
heig
ht2h
sp
1.08
2531
75P
For
UN
thre
ads,
2hsp
2hn
ofex
tern
alU
Nth
read
(2h s
)2h
sp
1.08
2531
75(0
.035
7142
9)A
llth
read
calc
ulat
ions
are
tobe
perf
orm
edus
ing
(P)
roun
ded
toei
ght
deci
mal
plac
es.
2hsp
0.03
8662
...
d 1m
ax.p
0.49
89−
0.03
8662
...
d 1m
ax.p
0.46
0238
This
figur
eis
roun
ded
tofo
urde
cim
alpl
aces
toob
tain
the
final
valu
eof
d 1m
ax.
d 1m
ax.p
0.46
02..
.
GEN
ERA
LN
OTE
S:(a
)A
lldi
men
sion
sex
pres
sed
inin
ches
for
calc
ulat
ions
inth
ista
ble.
(b)
Pp
1/n
p1/
28p
0.03
5714
29.
89
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Tabl
e18
BEx
ampl
esof
Inte
rnal
Scre
wTh
read
s
Thre
adS
izep
1 ⁄ 2–
28or
0.50
00–
28U
NEF
-2B
Char
acte
rist
icD
escr
ipti
onEx
ampl
eof
Siz
eCa
lcul
atio
nA
ddit
iona
lIn
form
atio
n
(1)
Min
imum
inte
rnal
min
ordi
amet
er(D
1m
in.)
D1
min
.pD
bsc
−2h
n..
.p
Bas
icm
ajor
diam
eter
(Dbs
c)−
doub
lehe
ight
ofin
tern
al2h
np
1.08
2531
75P
...
thre
ad(2
h n)
2hnp
1.08
2531
75(0
.035
7142
9)A
llth
read
calc
ulat
ions
are
tobe
perf
orm
edus
ing
(P)
roun
ded
toei
ght
deci
mal
plac
es.
2hnp
0.03
8662
...
D1
min
.p0.
5000
−0.
0386
62..
.D
1m
in.p
0.46
1338
For
the
Clas
s2B
thre
adus
edin
this
exam
ple,
this
figur
eis
roun
ded
toth
ree
deci
mal
plac
esto
obta
inth
efin
alva
lue
ofD
1m
in.
Oth
ersi
zes
and
clas
ses
are
expr
esse
din
afo
urpl
ace
deci
mal
.Se
epa
ra.
8.3.
2(e)
.D
1m
in.p
0.46
1..
.
(2)
Max
imum
inte
rnal
min
ordi
amet
er(D
1m
ax.)
D1
max
.pD
1m
in.(
tosi
xde
cim
alpl
aces
)+
TD1
See
para
.5.
8.2(
c)fo
rlim
itatio
nson
use
ofp
Min
imum
inte
rnal
min
ordi
amet
er(D
1m
in.)
roun
ded
tosi
xTD
1p
0.25
P−
0.4P
2th
isfo
rmul
a.de
cim
alpl
aces
+in
tern
alm
inor
diam
eter
tole
ranc
e(T
D1)
TD1
p0.
25(0
.035
7142
9)−
0.4
(0.0
3571
429)
2A
llth
read
calc
ulat
ions
are
tobe
perf
orm
edus
ing
(P)
roun
ded
toei
ght
deci
mal
plac
es.
TD1
p0.
25(0
.035
7142
9)−
0.4
(0.0
0127
6)..
.TD
1p
0.00
8929
−0.
0005
10..
.TD
1p
0.00
8419
...
TD1
p0.
0084
This
figur
eis
roun
ded
tofo
urde
cim
alpl
aces
toob
tain
the
final
valu
eof
TD1.
D1
max
.p0.
4613
38+
0.00
84..
.D
1m
ax.p
0.46
9757
For
the
Clas
s2B
thre
adus
edin
this
exam
ple,
this
figur
eis
roun
ded
toth
ree
deci
mal
plac
esto
obta
inth
efin
alva
lue
ofD
1m
ax.
Oth
ersi
zes
and
clas
ses
are
expr
esse
din
afo
urpl
ace
deci
mal
.Se
epa
ra.
8.3.
2(e)
.D
1m
ax.p
0.47
0..
.
90
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Tabl
e18
BEx
ampl
esof
Inte
rnal
Scr
ewTh
read
s(C
ont’
d)
Thre
adS
izep
1⁄ 2
–2
8or
0.5
00
0–
28
UN
EF-2
B
Ch
arac
teri
stic
Des
crip
tion
Exam
ple
ofS
ize
Calc
ulat
ion
Ad
dit
iona
lIn
form
atio
n
(3)
Min
imu
min
tern
alp
itch
dia
met
er(D
2m
in.)
D2
min
.p
Db
sc−
hb
..
.p
Bas
icm
ajor
dia
met
er(D
bsc
)−
twic
eth
eex
tern
alth
read
hb
p0
.64
95
19
05
P.
..
add
end
um
(hb)
hb
p0
.64
95
19
05
(0.0
35
71
42
9)
All
thre
adca
lcu
lati
ons
are
tob
ep
erfo
rmed
usi
ng
(P)
roun
ded
toei
ght
dec
imal
pla
ces.
hb
p0
.02
31
97
..
.D
2m
in.p
0.5
00
0−
0.0
23
19
7.
..
D2
min
.p
0.4
76
80
3Th
isfi
gure
isro
und
edto
fou
rd
ecim
alp
lace
sto
obta
inth
efi
nal
valu
eof
D2
min
.D
2m
in.p
0.4
76
8.
..
(4)
Max
imu
min
tern
alp
itch
dia
met
er(D
2m
ax.)
D2
max
.p
D2
min
.+
TD2
..
.p
Min
imu
min
tern
alp
itch
dia
met
er(D
2m
in.)
+in
tern
alp
itch
TD2
p1
.30
0(T
d2
for
Clas
s2
A)
The
cons
tan
t1
.30
0is
for
this
Clas
s2
Bex
am-
dia
met
erto
lera
nce
(TD
2)
ple
and
will
be
dif
fere
nt
for
Clas
ses
1B
and
3B
.S
eep
ara.
5.8
.2.
TD2
p1
.30
0(0
.00
36
68
)Fo
rth
eTd
2Cl
ass
2A
pit
chd
iam
eter
tole
ran
ce,
see
Tab
le1
8A
,(4
).Th
esi
xp
lace
dec
imal
pla
ceva
lue
isu
sed
.TD
2p
0.0
04
76
8.
..
TD2
p0
.00
48
This
figu
reis
roun
ded
tofo
ur
dec
imal
pla
ces
toob
tain
the
fina
lva
lue
ofTD
2.
D2
max
.p
0.4
76
8+
0.0
04
8.
..
D2
max
.p
0.4
81
6.
..
(5)
Min
imu
min
tern
alm
ajor
dia
met
er(D
min
.)D
min
.p
Db
sc.
..
pB
asic
maj
ord
iam
eter
(Db
sc)
Db
scp
0.5
00
0.
..
Dm
in.p
0.5
00
0.
..
GEN
ERA
LN
OTE
S:
(a)
All
dim
ensi
ons
exp
ress
edin
inch
esfo
rca
lcu
lati
ons
inth
ista
ble
.(b
)P
p1
/np
1/2
8p
0.0
35
71
42
9.
91
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ASME B1.1-2003 UNIFIED INCH SCREW THREADS
Table 19 Allowable Variation in 30 deg Basic HalfAngle of External and Internal Screw Threads
Allowable Variationin Half Angle
of Thread
Threads/in. ±deg Min.
80 3 0072 2 4564 2 3056 2 15
48 2 0044 1 5040 1 4536 1 35
32 1 3028 1 2027 1 2024 1 15
20 1 1018 1 0516 1 0014 0 55
13 0 5512 0 50111⁄2 0 5011 0 50
10 0 509 0 508 0 457 0 45
6 0 405 0 4041⁄2 0 404 0 40
GENERAL NOTE: See paras. 9.1.3 through 9.1.6 for applicability.
92
UNIFIED INCH SCREW THREADS ASME B1.1-2003
Table 20 General Symbols (See Fig. 6)
Symbol Dimension Remarks
d Major diameter, external threadD Major diameter, internal threadD3 Major diameter, rounded root,
internal threadd2 Pitch diameter, external threadD2 Pitch diameter, internal thread
d1 Minor diameter, external threadd3 Minor diameter, rounded root,
external threadD1 Minor diameter, internal threadP Pitchn p 1⁄ P Number of threads per unit
of length (per inch)
N p 1⁄ L Number of turns per unitof length (per inch)
H Height of fundamental triangleh Thread height (or depth)ha Addendumhd Dedendum
he Depth of thread engagement
hs Height of UN or UNR externalthread
hn Height of UN internal thread
has Addendum of external thread
Hb Twice the external threadaddendum
� Half angle of symmetrical thread
�1 Angle between leading flankof thread and normalto axis of thread
�2 Angle between followingflank of thread and normalto axis of thread
� Lead angle tan � pL
�(d2 or D2)Radius of rounding at:
rcs crest of external threadrrs root of external threadRcn crest of internal threadRrn root of internal thread
Radial distance from apex offundamental triangle to:
scs rounded crest of external threadsrs rounded root of external threadscn rounded crest of internal threadsrn rounded root of internal thread
Distance from apex offundamental triangle to:
fcs flat at crest of external thread
93
Table 20 General Symbols (See Fig. 6) (Cont’d)
Symbol Dimension Remarks
frs flat at root of external threadfcn flat at crest of internal threadfrn flat at root of internal thread
Width of:F flat (general)Fcs flat at crest of external threadFrs flat at root of external threadFcn flat at crest of internal threadFrn flat at root of internal thread
es Allowance at major, pitch, and minordiameters of external thread
EI Allowance at major, pitch, and minordiameters of internal thread
Lts Length of complete external thread
Ltn Length of complete internal thread,including chamfer
LE Length of thread engagement
W Diameter of measuring wires
Mw Measurement over wires
C Correction to measurement over d2 or D2 pbest size wires to give pitch Mw − C − cdiameter C p W (1 + cosec �)
−(cot �)/2n�′ Wire anglec Wire angle correction for See FED-STD-H28/6
large lead angles
Prefix Examples: Variation inSymbol pitch �Piwith � Variation in any dimension variation in half
angle, � �1 or ��2
�d2�, Pitch diameter�D2� equivalent of variation
in flank angles
�d2�, Pitch diameter�D2� equivalent of variation
in pitch (lead)
GENERAL NOTE: Refer to ASME B1.7 for latest symbol identification.Greek alphabet is below.
�, � p Alpha�, � p Beta� , p Gamma�, p Delta�, � p Epsilon , � p Zeta�, � p Eta�, � p Theta�, � p Iota�, � p Kappa�, � p Lambda�, � p Mu
�, � p Nu�, � p Xi�, � p Omicron , � p Pi!, " p Rho#, $ p Sigma%, & p Tau', ( p Upsilon), * p Phi+, , p Chi-, . p Psi/, 0 p Omega
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94
ASME B1.1-2003
NONMANDATORY APPENDIX ATERMINOLOGY AND IDENTIFICATION OF UNIFIED INCH SCREW
THREADS
A-1 TERMINOLOGY
All terms relating to screw threads used in this Stan-dard are defined in ASME B1.7.
0.625H
0.75H
0.25P
UN External Thread
0.125P
0.25P
0.25P
0.125P 0.3125P
0.5625H
0.75H
0.6667H
0.125P0.125P 0.3125P
0.125P
Nominalminor diam.
Will assemble withUN or UNJ internal
0.125P
P (pitch)
rad. = 0.14434PH(fundamental
triangle)
rad. = 0.10826Prad. = 0.18042P
rad. = 0.15011P
Nominalminor diam.
Will assemble withUN or UNJ internal
Minimumminor diam.
Maximumminor diam.
Assembles onlywith UNJ internal
Root to clear 0.125P width, may be flat or rounded
UNR External Thread
UNJ Internal ThreadUN Internal Thread
UNJ External Thread
Will notassemblewith UNJexternalthread
Root to clear 0.125P width, flat or roundedAssembles
with allUN
externalthread
Fig. A-1 Identification of 60-deg Inch Screw Threads Within the Scope of ASME B1 Committee
95
A-2 IDENTIFICATIONThe various unified screw threads covered in B1 stan-
dards are compared in Fig. A-1 and Table A-1.
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ASME B1.1-2003 NONMANDATORY APPENDIX A
Table A-1 Identification of 60-deg lnch Screw Threads Within the Scope of ASMEB1 Committee
UN Threads, UNR Threads, UNJ Threads, Internal andThread Identification Internal and External External Only External
ASME standards documents B1.1, Unified Inch Screw B1.1, Unified Inch Screw B1.15, Unified Inch ScrewThreads; B1.2, Gages and Gag- Threads; B1.2, Gages and Gag- Threads — UNJ Threading for Unified Inch Screw ing for Unified Inch Screw Form; draft of B1.2,Threads Threads Gages and Gaging for
Unified Inch ScrewThreads
External root External thread root may be flat Rounded root specified Rounded root specifiedor rounded
External minor diameter External thread minor diameter is External thread minor diameter is External thread minornot toleranced not toleranced diameter is toleranced
External threads UN Classes 1A, 2A, and 3A UNR Classes 1A, 2A, and 3A UNJ Classes 2A and 3Amate only with UNJinternal threads
Internal threads UN Classes 1B, 2B, and 3B No internal threads designated UNJ Classes 2B and 3BUNR; UNR mates with UN (no rounding requiredinternal threads on internal thread root)
GENERAL NOTES:(a) The above cannot be used as a working sheet. Refer to the appropriate standards, as listed, for complete thread
details and conformance data.(b) The appropriate current standard is the authoritative document for complete details and data and takes precedence
over this sheet.(c) These standards may be purchased from the ASME Order Department, 22 Law Drive, Box 2300, Fairfield, NJ 07007-
2300: telephone (201) 882-1167 or 1-800-THE-ASME.
96
ASME B1.1-2003
NONMANDATORY APPENDIX BTHREAD STRENGTH DESIGN FORMULAS
B-1 THREAD TENSILE STRESS AREA
The following thread tensile stress area formulas areused for the purpose of product acceptance computa-tions. Tensile stress area:
As p 3.1416 �D2
2−
3H16 �
2
or
As p 0.7854 �D −0.9743
1/P �2
where
D p basic major diameterD2 p basic pitch diameter
1/P p number of threads per inch
For 3H/16, see Table 5.
B-2 THREAD SHEAR DATA
The following formulas for thread shear areas are geo-metric minimum values. Shear (thread stripping)strengths of screw threads under load are dependent,in addition, on mating component relative materialstrengths, nut geometry, and coefficient of frictionbetween thread bearing surfaces. Effective shear areasare therefore somewhat less than the geometric values.Thread geometric shear areas:
ASn p 3.1416 (1/P)(LE)(d min.)
� � 12(1/P)
+ 0.57735 (d min. − D2 max.)�ASs p 3.1416 (1/P)(LE)(D1 max.)
� � 12(1/P)
+ 0.57735 (d2 min. − D1 max.)�
97
where
ASn p minimum thread shear area for internalthreads
ASs p minimum thread shear area for externalthreads
1/P p number of threads per inchLE p length of engagement
d min. p minimum major diameter of externalthread
d2 min. p minimum pitch diamter of external threadD1 max. p maximum minor diameter of internal
threadD2 max. p maximum pitch diameter of internal
thread
B-3 LENGTH OF THREAD ENGAGEMENT
In general, the length of engagement of mating threadsis selected to utilize full tensile strength of a bolt prior toshearing of nut threads. Other applications may requireinternal thread shear prior to failure of the externallythreaded part. For noncritical design, the following for-mulas are often used for approximation:
tensile strength of externally threaded part p StAs
shear strength of threads p 0.5St (ASn or ASs)
whereSt p ultimate tensile strength of material, psi
An internationally accepted study on the subject waspublished in the 1977 Transactions of the Society ofAutomotive Engineers as paper number 770420, Analysisand Design of Threaded Assemblies, by E. M. Alexander.
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ASME B1.1-2003
NONMANDATORY APPENDIX CUNIFIED INCH SCREW THREADS — METRIC TRANSLATION
C-1 BACKGROUND
This Appendix presents a translation of unified inchscrew threads into metric units of measurement. It isvery important to recognize that this translation is notISO metric screw threads. The tables of limiting dimen-sions of standard and UNS/UNRS series threads andthe table of thread form data translated from inches tomillimeters presented in this Appendix implement thedecision of the B1 Committee that there should be officialmetric translations of inch screw thread standards tobetter fill communication needs in internationalexchange of technical data. This philosophy originatedat the May 4, 1964, meeting of the Committee and wasapproved by a letter ballot of the Committee on Novem-ber 2, 1966.
The tables in this Appendix were originally publishedas USAS B1.1a-1968 Supplement to USAS B1.1-1960, inthe interest of meeting urgent needs of industry.
C-2 DIMENSIONS
All dimensions in this Appendix are given in millime-ters unless otherwise specified. Metric values in the lim-iting dimension tables are translations of the inch valuestabulated in ASME B1.1.
The values in Table C-1 are a direct soft conversionof Table 2 in this Standard. All inch values weremultiplied by 25.4 and rounded to four decimal places,per the rounding policy stated in ASME B1.30. Similarly,Tables C-2 and C-3 are soft conversions of Tables D-1and 5, respectively.
Where it is necessary to use metric values of threadsfor which the metric limiting dimensions are not tabu-lated herein, the inch values should be determined inaccordance with para. 8 of ASME B1.1 before translating
98
to metric values and rounding by the method prescribedin the foregoing paragraph.
C-3 DESIGNATIONS
Designation of unified inch screw threads expressedin metric dimensions shall be as prescribed in paras.C-3.1 and C-3.2.
C-3.1 Metric Drawings or Documents
On metric drawings or documents, the designationshall specify, in sequence, the nominal size (expressed indecimal inches), the number of threads per inch, threadseries symbol, and thread class symbol. All supplemen-tal dimensions shall be as shown in metric units. Theequivalent inch dimensions, as indicated and enclosedin parentheses, may be included if desired.EXAMPLE (on metric drawing or metric document):0.250 – 28 UNF-2A (22)PD 5.7353 – 5.6515(0.2258 – 0.2225 in.) (optional)
C-3.2 Inch Drawings or Documents
On inch drawings or documents, the designation andsupplemental dimensions expressed in inches may befurther supplemented by inclusion of the equivalentmetric dimensions, so indicated and enclosed in paren-theses.EXAMPLE:0.250 – 28 UNF-2A (22)PD 0.2258 – 0.2225(5.7353 – 5.6515 mm) (optional)
C-4 TABLES
Tables C-1, C-2, and C-3 give limits of size for standardseries and UNS/UNRS series threads and thread formdata.
99
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
0–80
or0.
060–
80U
NF
1.52
400.
3175
2A0.
0127
1.51
131.
4300
...
1.30
561.
2598
0.04
571.
1328
2B1.
1811
1.30
561.
3183
1.37
670.
0584
1.52
403A
0.00
001.
5240
1.44
27..
.1.
3183
1.28
520.
0330
1.14
553B
1.18
111.
3056
1.31
831.
3614
0.04
321.
5240
1–64
or0.
073–
64U
NC
1.85
420.
3969
2A0.
0152
1.83
901.
7424
...
1.58
241.
5316
0.05
081.
3665
2B1.
4249
1.57
991.
5977
1.66
370.
0660
1.85
423A
0.00
001.
8542
1.75
77..
.1.
5977
1.55
960.
0381
1.38
183B
1.42
491.
5799
1.59
771.
6459
0.04
831.
8542
1–72
or0.
073–
72U
NF
1.85
420.
3528
2A0.
0152
1.83
901.
7501
...
1.61
041.
5621
0.04
831.
4199
2B1.
4732
1.61
041.
6256
1.68
910.
0635
1.85
423A
0.00
001.
8542
1.76
53..
.1.
6256
1.59
000.
0356
1.43
513B
1.47
321.
6104
1.62
561.
6739
0.04
831.
8542
2–56
or0.
086–
56U
NC
2.18
440.
4536
2A0.
0152
2.16
922.
0650
...
1.87
451.
8212
0.05
331.
6281
2B1.
6942
1.87
201.
8898
1.96
090.
0711
2.18
443A
0.00
002.
1844
2.08
03..
.1.
8898
1.84
910.
0406
1.64
343B
1.69
421.
8720
1.88
981.
9431
0.05
332.
1844
2–64
or0.
086–
64U
NF
2.18
440.
3969
2A0.
0152
2.16
922.
0726
...
1.91
261.
8618
0.05
081.
6967
2B1.
7551
1.91
011.
9279
1.99
640.
0686
2.18
443A
0.00
002.
1844
2.08
79..
.1.
9279
1.88
980.
0381
1.71
203B
1.75
511.
9101
1.92
791.
9787
0.05
082.
1844
3–48
or0.
099–
48U
NC
2.51
460.
5292
2A0.
0178
2.49
682.
3825
...
2.15
392.
0955
0.05
841.
8669
2B1.
9406
2.14
632.
1717
2.24
790.
0762
2.51
463A
0.00
002.
5146
2.40
03..
.2.
1717
2.12
850.
0432
1.88
473B
1.94
062.
1463
2.17
172.
2276
0.05
592.
5146
3–56
or0.
099–
56U
NF
2.51
460.
4536
2A0.
0178
2.49
682.
3927
...
2.20
222.
1463
0.05
591.
9558
2B2.
0244
2.19
712.
2200
2.29
110.
0711
2.51
463A
0.00
002.
5146
2.41
05..
.2.
2200
2.17
930.
0406
1.97
363B
2.02
442.
1971
2.22
002.
2733
0.05
332.
5146
4–40
or0.
112–
40U
NC
2.84
480.
6350
2A0.
0203
2.82
452.
6949
...
2.41
302.
3495
0.06
352.
0676
2B2.
1565
2.38
512.
4333
2.51
710.
0838
2.84
483A
0.00
002.
8448
2.71
53..
.2.
4333
2.38
510.
0483
2.08
793B
2.15
652.
3851
2.43
332.
4943
0.06
102.
8448
4–48
or0.
112–
48U
NF
2.84
480.
5292
2A0.
0178
2.82
702.
7127
...
2.48
412.
4232
0.06
102.
1971
2B2.
2708
2.45
872.
5019
2.58
060.
0787
2.84
483A
0.00
002.
8448
2.73
05..
.2.
5019
2.45
620.
0457
2.21
493B
2.27
082.
4587
2.50
192.
5603
0.05
842.
8448
5–40
or0.
125–
40U
NC
3.17
500.
6350
2A0.
0203
3.15
473.
0251
...
2.74
322.
6772
0.06
602.
3978
2B2.
4867
2.69
752.
7635
2.84
730.
0838
3.17
503A
0.00
003.
1750
3.04
55..
.2.
7635
2.71
530.
0483
2.41
813B
2.48
672.
6975
2.76
352.
8270
0.06
353.
1750
5–44
or0.
125–
44U
NF
3.17
500.
5773
2A0.
0178
3.15
723.
0353
...
2.78
132.
7178
0.06
352.
4689
2B2.
5502
2.74
072.
7991
2.88
040.
0813
3.17
503A
0.00
003.
1750
3.05
31..
.2.
7991
2.75
080.
0483
2.48
673B
2.55
022.
7407
2.79
912.
8600
0.06
103.
1750
6–32
or0.
138–
32U
NC
3.50
520.
7938
2A0.
0203
3.48
493.
3325
...
2.96
932.
8981
0.07
112.
5400
2B2.
6416
2.89
562.
9896
3.08
360.
0940
3.50
523A
0.00
003.
5052
3.35
28..
.2.
9896
2.93
620.
0533
2.56
033B
2.64
162.
8931
2.98
963.
0582
0.06
863.
5052
6–40
or0.
138–
40U
NF
3.50
520.
6350
2A0.
0203
3.48
493.
3553
...
3.07
343.
0074
0.06
602.
7280
2B2.
8194
3.02
263.
0937
3.18
010.
0864
3.50
523A
0.00
003.
5052
3.37
57..
.3.
0937
3.04
290.
0508
2.74
833B
2.81
943.
0124
3.09
373.
1572
0.06
353.
5052
8–32
or0.
164–
32U
NC
4.16
560.
7938
2A0.
0229
4.14
273.
9903
...
3.62
713.
5535
0.07
373.
1979
2B3.
3020
3.53
063.
6500
3.74
650.
0965
4.16
563A
0.00
004.
1656
4.01
32..
.3.
6500
3.59
410.
0559
3.22
073B
3.30
203.
5255
3.65
003.
7211
0.07
114.
1656
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
100
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
8–36
or0.
164–
36U
NF
4.16
560.
7056
2A0.
0203
4.14
534.
0056
...
3.68
813.
6170
0.07
113.
3045
2B3.
4036
3.60
683.
7084
3.79
980.
0914
4.16
563A
0.00
004.
1656
4.02
59..
.3.
7084
3.65
510.
0533
3.32
493B
3.40
363.
5966
3.70
843.
7770
0.06
864.
1656
10–
24or
0.19
0–24
UN
C4.
8260
1.05
832A
0.02
544.
8006
4.61
77..
.4.
1123
4.02
840.
0838
3.54
082B
3.68
303.
9370
4.13
774.
2469
0.10
924.
8260
3A0.
0000
4.82
604.
6431
...
4.13
774.
0742
0.06
353.
5662
3B3.
6830
3.94
974.
1377
4.21
890.
0813
4.82
60
10–
32or
0.19
0–32
UN
F4.
8260
0.79
382A
0.02
294.
8031
4.65
07..
.4.
2875
4.21
130.
0762
3.85
832B
3.96
244.
1656
4.31
044.
4094
0.09
914.
8260
3A0.
0000
4.82
604.
6736
...
4.31
044.
2520
0.05
843.
8811
3B3.
9624
4.16
814.
3104
4.38
400.
0737
4.82
60
12–
24or
0.21
6–24
UN
C5.
4864
1.05
832A
0.02
545.
4610
5.27
81..
.4.
7727
4.68
630.
0864
4.20
122B
4.34
344.
5974
4.79
814.
9098
0.11
185.
4864
3A0.
0000
5.48
645.
3035
...
4.79
814.
7320
0.06
604.
2266
3B4.
3434
4.58
984.
7981
4.88
190.
0838
5.48
64
12–
28or
0.21
6–28
UN
F5.
4864
0.90
712A
0.02
545.
4610
5.29
59..
.4.
8717
4.79
040.
0813
4.38
152B
4.49
584.
7244
4.89
715.
0038
0.10
675.
4864
3A0.
0000
5.48
645.
3213
...
4.89
714.
8362
0.06
104.
4069
3B4.
4958
4.71
684.
8971
4.97
590.
0787
5.48
64
12–
32or
0.21
6–32
UN
EF5.
4864
0.79
382A
0.02
545.
4610
5.30
86..
.4.
9454
4.86
410.
0813
4.51
612B
4.62
284.
8260
4.97
085.
0749
0.10
415.
4864
3A0.
0000
5.48
645.
3340
...
4.97
084.
9098
0.06
104.
5415
3B4.
6228
4.81
334.
9708
5.04
950.
0787
5.48
64
1 ⁄ 4–
20or
0.25
00–
20U
NC
6.35
001.
2700
1A0.
0279
6.32
216.
0122
...
5.49
665.
3543
0.14
224.
8108
1B4.
9784
5.25
785.
5245
5.70
990.
1854
6.35
002A
0.02
796.
3221
6.11
636.
0122
5.49
665.
4026
0.09
404.
8108
2B4.
9784
5.25
785.
5245
5.64
900.
1245
6.35
003A
0.00
006.
3500
6.14
43..
.5.
5245
5.45
340.
0711
4.83
873B
4.97
845.
2502
5.52
455.
6159
0.09
146.
3500
1 ⁄ 4–
28or
0.25
00–
28U
NF
6.35
000.
9071
1A0.
0254
6.32
466.
0757
...
5.73
535.
6083
0.12
705.
2451
1B5.
3594
5.58
805.
7607
5.92
580.
1651
6.35
002A
0.02
546.
3246
6.15
95..
.5.
7353
5.65
150.
0838
5.24
512B
5.35
945.
5880
5.76
075.
8699
0.10
926.
3500
3A0.
0000
6.35
006.
1849
...
5.76
075.
6972
0.06
355.
2705
3B5.
3594
5.56
265.
7607
5.84
200.
0813
6.35
00
1 ⁄ 4–
32or
0.25
00–
32U
NEF
6.35
000.
7938
2A0.
0254
6.32
466.
1722
...
5.80
905.
7277
0.08
135.
3797
2B5.
4864
5.68
965.
8344
5.94
110.
1067
6.35
003A
0.00
006.
3500
6.19
76..
.5.
8344
5.77
340.
0610
5.40
513B
5.48
645.
6617
5.83
445.
9131
0.07
876.
3500
5 ⁄ 16–
18or
0.31
25–
18U
NC
7.93
751.
4111
1A0.
0305
7.90
707.
5743
...
6.99
016.
8351
0.15
496.
2255
1B6.
4008
6.73
107.
0206
7.22
120.
2007
7.93
752A
0.03
057.
9070
7.68
607.
5743
6.99
016.
8885
0.10
166.
2255
2B6.
4008
6.73
107.
0206
7.15
520.
1346
7.93
753A
0.00
007.
9375
7.71
65..
.7.
0206
6.94
440.
0762
6.25
603B
6.40
086.
6802
7.02
067.
1196
0.09
917.
9375
5 ⁄ 16–
20or
0.31
25–
20U
N7.
9375
1.27
002A
0.03
057.
9070
7.70
13..
.7.
0815
6.97
740.
1041
6.39
572B
6.55
326.
8580
7.11
207.
2466
0.13
467.
9375
3A0.
0000
7.93
757.
7318
...
7.11
207.
0358
0.07
626.
4262
3B6.
5532
6.80
727.
1120
7.21
360.
1016
7.93
75
5 ⁄ 16–
24or
0.31
25–
24U
NF
7.93
751.
0583
1A0.
0279
7.90
967.
6352
...
7.22
127.
0815
0.13
976.
6497
1B6.
7818
7.03
587.
2492
7.42
950.
1803
7.93
752A
0.02
797.
9096
7.72
67..
.7.
2212
7.12
720.
0940
6.64
972B
6.78
187.
0358
7.24
927.
3711
0.12
197.
9375
3A0.
0000
7.93
757.
7546
...
7.24
927.
1806
0.06
866.
6777
3B6.
7818
6.99
527.
2492
7.34
060.
0914
7.93
75
ASME B1.1-2003 NONMANDATORY APPENDIX C
101
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
5 ⁄ 16–
28or
0.31
25–
28U
N7.
9375
0.90
712A
0.02
547.
9121
7.74
70..
.7.
3228
7.23
390.
0889
6.83
262B
6.95
967.
1628
7.34
827.
4625
0.11
437.
9375
3A0.
0000
7.93
757.
7724
...
7.34
827.
2822
0.06
606.
8580
3B6.
9596
7.12
987.
3482
7.43
460.
0864
7.93
75
5 ⁄ 16–
32or
0.31
25–
32U
NEF
7.93
750.
7938
2A0.
0254
7.91
217.
7597
...
7.39
657.
3127
0.08
386.
9672
2B7.
0866
7.26
447.
4219
7.53
110.
1092
7.93
753A
0.00
007.
9375
7.78
51..
.7.
4219
7.35
840.
0635
6.99
263B
7.08
667.
2288
7.42
197.
5032
0.08
137.
9375
3 ⁄ 8–
16or
0.37
50–
16U
NC
9.52
501.
5875
1A0.
0330
9.49
209.
1313
...
8.46
078.
2956
0.16
517.
6022
1B7.
7978
8.15
348.
4938
8.70
970.
2159
9.52
502A
0.03
309.
4920
9.25
329.
1313
8.46
078.
3490
0.11
187.
6022
2B7.
7978
8.15
348.
4938
8.63
850.
1448
9.52
503A
0.00
009.
5250
9.28
62..
.8.
4938
8.40
990.
0838
7.63
523B
7.79
788.
0823
8.49
388.
6030
0.10
929.
5250
3 ⁄ 8–
20or
0.37
50–
20U
N9.
5250
1.27
002A
0.03
059.
4945
9.28
88..
.8.
6690
8.56
490.
1041
7.98
322B
8.15
348.
4328
8.69
958.
8367
0.13
729.
5250
3A0.
0000
9.52
509.
3193
...
8.69
958.
6208
0.07
878.
0137
3B8.
1534
8.37
448.
6995
8.80
110.
1016
9.52
50
3 ⁄ 8–
24or
0.37
50–
24U
NF
9.52
501.
0583
1A0.
0279
9.49
719.
2227
...
8.80
878.
6639
0.14
488.
2372
1B8.
3820
8.63
608.
8367
9.02
460.
1880
9.52
502A
0.02
799.
4971
9.31
42..
.8.
8087
8.71
220.
0965
8.23
722B
8.38
208.
6360
8.83
678.
9611
0.12
459.
5250
3A0.
0000
9.52
509.
3421
...
8.83
678.
7630
0.07
378.
2652
3B8.
3820
8.56
498.
8367
8.93
060.
0940
9.52
50
3 ⁄ 8–
28or
0.37
50–
28U
N9.
5250
0.90
712A
0.02
799.
4971
9.33
20..
.8.
9078
8.81
630.
0914
8.41
762B
8.53
448.
7630
8.93
579.
0526
0.11
689.
5250
3A0.
0000
9.52
509.
3599
...
8.93
578.
8671
0.06
868.
4455
3B8.
5344
8.70
208.
9357
9.02
460.
0889
9.52
50
3 ⁄ 8–
32or
0.37
50–
32U
NEF
9.52
500.
7938
2A0.
0254
9.49
969.
3472
...
8.98
408.
8976
0.08
648.
5547
2B8.
6614
8.86
469.
0094
9.12
110.
1118
9.52
503A
0.00
009.
5250
9.37
26..
.9.
0094
8.94
590.
0635
8.58
013B
8.66
148.
8113
9.00
949.
0932
0.08
389.
5250
7 ⁄ 16–
14or
0.43
75–
14U
NC
11.1
125
1.81
431A
0.03
5611
.076
910
.683
2..
.9.
8984
9.71
800.
1803
8.91
541B
9.14
409.
5504
9.93
3910
.167
60.
2337
11.1
125
2A0.
0356
11.0
769
10.8
153
10.6
832
9.89
849.
7790
0.11
948.
9154
2B9.
1440
9.55
049.
9339
10.0
889
0.15
4911
.112
53A
0.00
0011
.112
510
.850
9..
.9.
9339
9.84
500.
0889
8.95
103B
9.14
409.
4412
9.93
3910
.050
80.
1168
11.1
125
7 ⁄ 16–
16or
0.43
75–
16U
N11
.112
51.
5875
2A0.
0356
11.0
769
10.8
382
...
10.0
457
9.92
890.
1168
9.18
722B
9.39
809.
7536
10.0
813
10.2
337
0.15
2411
.112
53A
0.00
0011
.112
510
.873
7..
.10
.081
39.
9924
0.08
899.
2227
3B9.
3980
9.65
2010
.081
310
.195
60.
1143
11.1
125
7 ⁄ 16–
20or
0.43
75–
20U
NF
11.1
125
1.27
001A
0.03
3011
.079
510
.769
6..
.10
.254
010
.094
00.
1600
9.56
821B
9.72
8210
.033
010
.287
010
.492
70.
2057
11.1
125
2A0.
0330
11.0
795
10.8
737
...
10.2
540
10.1
473
0.10
679.
5682
2B9.
7282
10.0
330
10.2
870
10.4
242
0.13
7211
.112
53A
0.00
0011
.112
510
.906
8..
.10
.287
010
.208
30.
0787
9.60
123B
9.72
829.
9466
10.2
870
10.3
911
0.10
4111
.112
5
7 ⁄ 16–
28or
0.43
75–
28U
NEF
11.1
125
0.90
712A
0.02
7911
.084
610
.919
5..
.10
.495
310
.403
80.
0914
10.0
051
2B10
.134
610
.337
810
.523
210
.642
60.
1194
11.1
125
3A0.
0000
11.1
125
10.9
474
...
10.5
232
10.4
546
0.06
8610
.033
03B
10.1
346
10.2
895
10.5
232
10.6
121
0.08
8911
.112
5
7 ⁄ 16–
32or
0.43
75–
32U
N11
.112
50.
7938
2A0.
0254
11.0
871
10.9
347
...
10.5
715
10.4
851
0.08
6410
.142
22B
10.2
616
10.4
394
10.5
969
10.7
086
0.11
1811
.112
53A
0.00
0011
.112
510
.960
1..
.10
.596
910
.530
80.
0660
10.1
676
3B10
.261
610
.398
810
.596
910
.680
70.
0838
11.1
125
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
102
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
1 ⁄ 2–
13or
0.50
00–
13U
NC
12.7
000
1.95
381A
0.03
8112
.661
912
.247
9..
.11
.391
911
.203
90.
1880
10.3
353
1B10
.591
811
.023
611
.430
011
.676
40.
2464
12.7
000
2A0.
0381
12.6
619
12.3
850
12.2
479
11.3
919
11.2
649
0.12
7010
.335
32B
10.5
918
11.0
236
11.4
300
11.5
951
0.16
5112
.700
03A
0.00
0012
.700
012
.423
1..
.11
.430
011
.336
00.
0940
10.3
734
3B10
.591
810
.881
411
.430
011
.551
90.
1219
12.7
000
1 ⁄ 2–
16or
0.50
00–
16U
N12
.700
01.
5875
2A0.
0356
12.6
644
12.4
257
...
11.6
332
11.5
138
0.11
9410
.774
72B
10.9
728
11.3
284
11.6
688
11.8
237
0.15
4912
.700
03A
0.00
0012
.700
012
.461
2..
.11
.668
811
.579
90.
0889
10.8
102
3B10
.972
811
.226
811
.668
811
.785
60.
1168
12.7
000
1 ⁄ 2–
20or
0.50
00–
20U
NF
12.7
000
1.27
001A
0.03
3012
.667
012
.357
1..
.11
.841
511
.678
90.
1626
11.1
557
1B11
.328
411
.607
811
.874
512
.087
90.
2134
12.7
000
2A0.
0330
12.6
670
12.4
612
...
11.8
415
11.7
323
0.10
9211
.155
72B
11.3
284
11.6
078
11.8
745
12.0
167
0.14
2212
.700
03A
0.00
0012
.700
012
.494
3..
.11
.874
511
.793
20.
0813
11.1
887
3B11
.328
411
.524
011
.874
511
.981
20.
1067
12.7
000
1 ⁄ 2–
28or
0.50
00–
28U
NEF
12.7
000
0.90
712A
0.02
7912
.672
112
.507
0..
.12
.082
811
.988
80.
0940
11.5
926
2B11
.709
411
.938
012
.110
712
.232
60.
1219
12.7
000
3A0.
0000
12.7
000
12.5
349
...
12.1
107
12.0
396
0.07
1111
.620
53B
11.7
094
11.8
770
12.1
107
12.2
022
0.09
1412
.700
0
1 ⁄ 2–
32or
0.50
00–
32U
N12
.700
00.
7938
2A0.
0254
12.6
746
12.5
222
...
12.1
590
12.0
701
0.08
8911
.729
72B
11.8
364
12.0
396
12.1
844
12.2
987
0.11
4312
.700
03A
0.00
0012
.700
012
.547
6..
.12
.184
412
.118
30.
0660
11.7
551
3B11
.836
411
.986
312
.184
412
.270
70.
0864
12.7
000
9 ⁄ 16–
12or
0.56
25–
12U
NC
14.2
875
2.11
671A
0.04
0614
.246
913
.810
0..
.12
.872
712
.674
60.
1981
11.7
272
1B11
.988
812
.446
012
.913
413
.172
40.
2591
14.2
875
2A0.
0406
14.2
469
13.9
573
13.8
100
12.8
727
12.7
406
0.13
2111
.727
22B
11.9
888
12.4
460
12.9
134
13.0
861
0.17
2714
.287
53A
0.00
0014
.287
513
.997
9..
.12
.913
412
.814
30.
0991
11.7
678
3B11
.988
812
.301
212
.913
413
.042
90.
1295
14.2
875
9 ⁄ 16–
16or
0.56
25–
16U
N14
.287
51.
5875
2A0.
0356
14.2
519
14.0
132
...
13.2
207
13.1
013
0.11
9412
.362
22B
12.5
730
12.9
286
13.2
563
13.4
112
0.15
4914
.287
53A
0.00
0014
.287
514
.048
7..
.13
.256
313
.167
40.
0889
12.3
977
3B12
.573
012
.804
113
.256
313
.373
10.
1168
14.2
875
9 ⁄ 16–
18or
0.56
25–
18U
NF
14.2
875
1.41
111A
0.03
5614
.251
913
.919
2..
.13
.335
013
.162
30.
1727
12.5
705
1B12
.750
813
.081
013
.370
613
.596
60.
2261
14.2
875
2A0.
0356
14.2
519
14.0
310
...
13.3
350
13.2
207
0.11
4312
.570
52B
12.7
508
13.0
810
13.3
706
13.5
204
0.14
9914
.287
53A
0.00
0014
.287
514
.066
5..
.13
.370
613
.284
20.
0864
12.6
060
3B12
.750
812
.969
213
.370
613
.482
30.
1118
14.2
875
9 ⁄ 16–
20or
0.56
25–
20U
N14
.287
51.
2700
2A0.
0330
14.2
545
14.0
487
...
13.4
290
13.3
198
0.10
9212
.743
22B
12.9
032
13.2
080
13.4
620
13.6
042
0.14
2214
.287
53A
0.00
0014
.287
514
.081
8..
.13
.462
013
.380
70.
0813
12.7
762
3B12
.903
213
.108
913
.462
013
.568
70.
1067
14.2
875
9 ⁄ 16–
24or
0.56
25–
24U
NEF
14.2
875
1.05
832A
0.03
0514
.257
014
.074
1..
.13
.568
713
.467
10.
1016
12.9
972
2B13
.131
813
.385
813
.599
213
.728
70.
1295
14.2
875
3A0.
0000
14.2
875
14.1
046
...
13.5
992
13.5
230
0.07
6213
.027
73B
13.1
318
13.3
198
13.5
992
13.6
982
0.09
9114
.287
5
9 ⁄ 16–
28or
0.56
25–
28U
N14
.287
50.
9071
2A0.
0279
14.2
596
14.0
945
...
13.6
703
13.5
763
0.09
4013
.180
12B
13.3
096
13.5
128
13.6
982
13.8
201
0.12
1914
.287
53A
0.00
0014
.287
514
.122
4..
.13
.698
213
.627
10.
0711
13.2
080
3B13
.309
613
.464
513
.698
213
.789
70.
0914
14.2
875
9 ⁄ 16–
32or
0.56
25–
32U
N14
.287
50.
7938
2A0.
0279
14.2
596
14.1
072
...
13.7
439
13.6
550
0.08
8913
.314
72B
13.4
366
13.6
144
13.7
719
13.8
887
0.11
6814
.287
53A
0.00
0014
.287
514
.135
1..
.13
.771
913
.705
80.
0660
13.3
426
3B13
.436
613
.573
813
.771
913
.858
20.
0864
14.2
875
ASME B1.1-2003 NONMANDATORY APPENDIX C
103
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
5 ⁄ 8–
11or
0.62
50–
11U
NC
15.8
750
2.30
911A
0.04
3215
.831
815
.369
5..
.14
.333
214
.122
40.
2108
13.0
810
1B13
.385
813
.868
414
.376
414
.648
20.
2718
15.8
750
2A0.
0432
15.8
318
15.5
245
15.3
721
14.3
332
14.1
935
0.13
9713
.081
02B
13.3
858
13.8
684
14.3
764
14.5
593
0.18
2915
.875
03A
0.00
0015
.875
015
.567
7..
.14
.376
414
.272
30.
1041
13.1
242
3B13
.385
813
.693
114
.376
414
.513
60.
1372
15.8
750
5 ⁄ 8–
12or
0.62
50–
12U
N15
.875
02.
1167
2A0.
0406
15.8
344
15.5
448
...
14.4
602
14.3
231
0.13
7213
.314
72B
13.5
890
14.0
462
14.5
009
14.6
812
0.18
0315
.875
03A
0.00
0015
.875
015
.585
4..
.14
.500
914
.396
70.
1041
13.3
553
3B13
.589
013
.876
014
.500
914
.635
50.
1346
15.8
750
5 ⁄ 8–
16or
0.62
50–
16U
N15
.875
01.
5875
2A0.
0356
15.8
394
15.6
007
...
14.8
082
14.6
863
0.12
1913
.949
72B
14.1
478
14.5
034
14.8
438
15.0
012
0.15
7515
.875
03A
0.00
0015
.875
015
.636
2..
.14
.843
814
.752
30.
0914
13.9
852
3B14
.147
814
.381
514
.843
814
.960
60.
1168
15.8
750
5 ⁄ 8–
18or
0.62
50–
18U
NF
15.8
750
1.41
111A
0.03
5615
.839
415
.506
7..
.14
.922
514
.744
70.
1778
14.1
580
1B14
.351
014
.681
214
.958
115
.189
20.
2311
15.8
750
2A0.
0356
15.8
394
15.6
185
...
14.9
225
14.8
031
0.11
9414
.158
02B
14.3
510
14.6
812
14.9
581
15.1
105
0.15
2415
.875
03A
0.00
0015
.875
015
.654
0..
.14
.958
114
.869
20.
0889
14.1
935
3B14
.351
014
.554
214
.958
115
.072
40.
1143
15.8
750
5 ⁄ 8–
20or
0.62
50–
20U
N15
.875
01.
2700
2A0.
0330
15.8
420
15.6
362
...
15.0
165
14.9
073
0.10
9214
.330
72B
14.5
034
14.7
828
15.0
495
15.1
917
0.14
2215
.875
03A
0.00
0015
.875
015
.669
3..
.15
.049
514
.968
20.
0813
14.3
637
3B14
.503
414
.696
415
.049
515
.156
20.
1067
15.8
750
5 ⁄ 8–
24or
0.62
50–
24U
NEF
15.8
750
1.05
832A
0.03
0515
.844
515
.661
6..
.15
.156
215
.054
60.
1016
14.5
847
2B14
.732
014
.986
015
.186
715
.318
70.
1321
15.8
750
3A0.
0000
15.8
750
15.6
921
...
15.1
867
15.1
105
0.07
6214
.615
23B
14.7
320
14.9
073
15.1
867
15.2
857
0.09
9115
.875
0
5 ⁄ 8–
28or
0.62
50–
28U
N15
.875
00.
9071
2A0.
0279
15.8
471
15.6
820
...
15.2
578
15.1
613
0.09
6514
.767
62B
14.8
844
15.1
130
15.2
857
15.4
102
0.12
4515
.875
03A
0.00
0015
.875
015
.709
9..
.15
.285
715
.214
60.
0711
14.7
955
3B14
.884
415
.052
015
.285
715
.379
70.
0940
15.8
750
5 ⁄ 8–
32or
0.62
50–
32U
N15
.875
00.
7938
2A0.
0279
15.8
471
15.6
947
...
15.3
314
15.2
400
0.09
1414
.902
22B
15.0
114
15.2
146
15.3
594
15.4
762
0.11
6815
.875
03A
0.00
0015
.875
015
.722
6..
.15
.359
415
.290
80.
0686
14.9
301
3B15
.011
415
.161
315
.359
415
.448
30.
0889
15.8
750
11⁄ 16
–12
or0.
6875
–12
UN
17.4
625
2.11
672A
0.04
0617
.421
917
.132
3..
.16
.047
715
.908
00.
1397
14.9
022
2B15
.163
815
.621
016
.088
416
.268
70.
1803
17.4
625
3A0.
0000
17.4
625
17.1
729
...
16.0
884
15.9
842
0.10
4114
.942
83B
15.1
638
15.4
559
16.0
884
16.2
230
0.13
4617
.462
5
11⁄ 16
–16
or0.
6875
–16
UN
17.4
625
1.58
752A
0.03
5617
.426
917
.188
2..
.16
.395
716
.273
80.
1219
15.5
372
2B15
.748
016
.103
616
.431
316
.591
30.
1600
17.4
625
3A0.
0000
17.4
625
17.2
237
...
16.4
313
16.3
398
0.09
1415
.572
73B
15.7
480
15.9
614
16.4
313
16.5
506
0.11
9417
.462
5
11⁄ 16
–20
or0.
6875
–20
UN
17.4
625
1.27
002A
0.03
3017
.429
517
.223
7..
.16
.604
016
.492
20.
1118
15.9
182
2B16
.078
216
.383
016
.637
016
.781
80.
1448
17.4
625
3A0.
0000
17.4
625
17.2
568
...
16.6
370
16.5
532
0.08
3815
.951
23B
16.0
782
16.2
839
16.6
370
16.7
462
0.10
9217
.462
5
11⁄ 16
–24
or0.
6875
–24
UN
EF17
.462
51.
0583
2A0.
0305
17.4
320
17.2
491
...
16.7
437
16.6
421
0.10
1616
.172
22B
16.3
068
16.5
608
16.7
742
16.9
088
0.13
4617
.462
53A
0.00
0017
.462
517
.279
6..
.16
.774
216
.698
00.
0762
16.2
027
3B16
.306
816
.494
816
.774
216
.873
20.
0991
17.4
625
11⁄ 16
–28
or0.
6875
–28
UN
17.4
625
0.90
712A
0.02
7917
.434
617
.269
5..
.16
.845
316
.748
80.
0965
16.3
551
2B16
.484
616
.687
816
.873
216
.997
70.
1245
17.4
625
3A0.
0000
17.4
625
17.2
974
...
16.8
732
16.7
996
0.07
3716
.383
03B
16.4
846
16.6
395
16.8
732
16.9
672
0.09
4017
.462
5
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
104
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
11⁄ 16
–32
or0.
6875
–32
UN
17.4
625
0.79
382A
0.02
7917
.434
617
.282
2..
.16
.918
916
.827
50.
0914
16.4
897
2B16
.611
616
.789
416
.946
917
.066
30.
1194
17.4
625
3A0.
0000
17.4
625
17.3
101
...
16.9
469
16.8
783
0.06
8616
.517
63B
16.6
116
16.7
488
16.9
469
17.0
358
0.08
8917
.462
5
3 ⁄ 4–
10or
0.75
00–
10U
NC
19.0
500
2.54
001A
0.04
5719
.004
318
.511
5..
.17
.353
317
.129
80.
2235
15.9
791
1B16
.306
816
.840
217
.399
017
.691
10.
2921
19.0
500
2A0.
0457
19.0
043
18.6
766
18.5
115
17.3
533
17.2
034
0.14
9915
.979
12B
16.3
068
16.8
402
17.3
990
17.5
946
0.19
5619
.050
03A
0.00
0019
.050
018
.722
3..
.17
.399
017
.287
20.
1118
16.0
249
3B16
.306
816
.624
317
.399
017
.543
80.
1448
19.0
500
3 ⁄ 4–
12or
0.75
00–
12U
N19
.050
02.
1167
2A0.
0432
19.0
068
18.7
173
...
17.6
327
17.4
930
0.13
9716
.487
12B
16.7
640
17.2
212
17.6
759
17.8
587
0.18
2919
.050
03A
0.00
0019
.050
018
.760
4..
.17
.675
917
.571
70.
1041
16.5
303
3B16
.764
017
.035
817
.675
917
.813
00.
1372
19.0
500
3 ⁄ 4–
16or
0.75
00–
16U
NF
19.0
500
1.58
751A
0.03
8119
.011
918
.651
2..
.17
.980
717
.790
20.
1905
17.1
221
1B17
.322
817
.678
418
.018
818
.267
70.
2489
19.0
500
2A0.
0381
19.0
119
18.7
731
...
17.9
807
17.8
537
0.12
7017
.122
12B
17.3
228
17.6
784
18.0
188
18.1
839
0.16
5119
.050
03A
0.00
0019
.050
018
.811
2..
.18
.018
817
.922
20.
0965
17.1
602
3B17
.322
817
.548
918
.018
818
.143
20.
1245
19.0
500
3 ⁄ 4–
20or
0.75
00–
20U
NEF
19.0
500
1.27
002A
0.03
3019
.017
018
.811
2..
.18
.191
518
.079
70.
1118
17.5
057
2B17
.678
417
.957
818
.224
518
.369
30.
1448
19.0
500
3A0.
0000
19.0
500
18.8
443
...
18.2
245
18.1
407
0.08
3817
.538
73B
17.6
784
17.8
714
18.2
245
18.3
337
0.10
9219
.050
0
3 ⁄ 4–
28or
0.75
00–
28U
N19
.050
00.
9071
2A0.
0305
19.0
195
18.8
544
...
18.4
302
18.3
337
0.09
6517
.940
02B
18.0
594
18.2
880
18.4
607
18.5
877
0.12
7019
.050
03A
0.00
0019
.050
018
.884
9..
.18
.460
718
.387
10.
0737
17.9
705
3B18
.059
418
.227
018
.460
718
.554
70.
0940
19.0
500
3 ⁄ 4–
32or
0.75
00–
32U
N19
.050
00.
7938
2A0.
0279
19.0
221
18.8
697
...
18.5
064
18.4
150
0.09
1418
.077
22B
18.1
864
18.3
896
18.5
344
18.6
538
0.11
9419
.050
03A
0.00
0019
.050
018
.897
6..
.18
.534
418
.465
80.
0686
18.1
051
3B18
.186
418
.336
318
.534
418
.625
80.
0914
19.0
500
13⁄ 16
–12
or0.
8125
–12
UN
20.6
375
2.11
672A
0.04
3220
.594
320
.304
8..
.19
.220
219
.077
90.
1422
18.0
746
2B18
.338
818
.796
019
.263
419
.446
20.
1829
20.6
375
3A0.
0000
20.6
375
20.3
479
...
19.2
634
19.1
567
0.10
6718
.117
83B
18.3
388
18.6
157
19.2
634
19.4
005
0.13
7220
.637
5
13⁄ 16
–16
or0.
8125
–16
UN
20.6
375
1.58
752A
0.03
8120
.599
420
.360
6..
.19
.568
219
.443
70.
1245
18.7
096
2B18
.923
019
.278
619
.606
319
.768
80.
1626
20.6
375
3A0.
0000
20.6
375
20.3
987
...
19.6
063
19.5
123
0.09
4018
.747
73B
18.9
230
19.1
364
19.6
063
19.7
282
0.12
1920
.637
5
13⁄ 16
–20
or0.
8125
–20
UN
EF20
.637
51.
2700
2A0.
0330
20.6
045
20.3
987
...
19.7
790
19.6
672
0.11
1819
.093
22B
19.2
532
19.5
580
19.8
120
19.9
593
0.14
7320
.637
53A
0.00
0020
.637
520
.431
8..
.19
.812
019
.728
20.
0838
19.1
262
3B19
.253
219
.458
919
.812
019
.921
20.
1092
20.6
375
13⁄ 16
–28
or0.
8125
–28
UN
20.6
375
0.90
712A
0.03
0520
.607
020
.441
9..
.20
.017
719
.918
70.
0991
19.5
275
2B19
.659
619
.862
820
.048
220
.175
20.
1270
20.6
375
3A0.
0000
20.6
375
20.4
724
...
20.0
482
19.9
746
0.07
3719
.558
03B
19.6
596
19.8
145
20.0
482
20.1
447
0.09
6520
.637
5
13⁄ 16
–32
or0.
8125
–32
UN
20.6
375
0.79
382A
0.02
7920
.609
620
.457
2..
.20
.093
920
.000
00.
0940
19.6
647
2B19
.786
619
.964
420
.121
920
.243
80.
1219
20.6
375
3A0.
0000
20.6
375
20.4
851
...
20.1
219
20.0
508
0.07
1119
.692
63B
19.7
866
19.9
238
20.1
219
20.2
133
0.09
1420
.637
5
ASME B1.1-2003 NONMANDATORY APPENDIX C
105
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
7 ⁄ 8–
9or
0.87
50–
9U
NC
22.2
250
2.82
221A
0.04
8322
.176
721
.648
4..
.20
.342
920
.101
60.
2413
18.8
163
1B19
.177
019
.761
220
.391
120
.703
50.
3124
22.2
250
2A0.
0483
22.1
767
21.8
237
21.6
484
20.3
429
20.1
828
0.16
0018
.816
32B
19.1
770
19.7
612
20.3
911
20.5
994
0.20
8322
.225
03A
0.00
0022
.225
021
.871
9..
.20
.391
120
.271
70.
1194
18.8
646
3B19
.177
019
.509
720
.391
120
.546
10.
1549
22.2
250
7 ⁄ 8–
12or
0.87
50–
12U
N22
.225
02.
1167
2A0.
0432
22.1
818
21.8
923
...
20.8
077
20.6
654
0.14
2219
.662
12B
19.9
390
20.3
962
20.8
509
21.0
363
0.18
5422
.225
03A
0.00
0022
.225
021
.935
4..
.20
.850
920
.744
20.
1067
19.7
053
3B19
.939
020
.198
120
.850
920
.990
60.
1397
22.2
250
7 ⁄ 8–
14or
0.87
50–
14U
NF
22.2
250
1.81
431A
0.04
0622
.184
421
.790
7..
.21
.005
820
.800
10.
2057
20.0
228
1B20
.269
220
.650
221
.046
421
.315
70.
2692
22.2
250
2A0.
0406
22.1
844
21.9
227
...
21.0
058
20.8
686
0.13
7220
.022
82B
20.2
692
20.6
502
21.0
464
21.2
242
0.17
7822
.225
03A
0.00
0022
.225
021
.963
4..
.21
.046
420
.942
30.
1041
20.0
635
3B20
.269
220
.490
221
.046
421
.181
10.
1346
22.2
250
7 ⁄ 8–
16or
0.87
50–
16U
N22
.225
01.
5875
2A0.
0381
22.1
869
21.9
481
...
21.1
557
21.0
312
0.12
4520
.297
12B
20.4
978
20.8
534
21.1
938
21.3
563
0.16
2622
.225
03A
0.00
0022
.225
021
.986
2..
.21
.193
821
.099
80.
0940
20.3
352
3B20
.497
820
.723
921
.193
821
.315
70.
1219
22.2
250
7 ⁄ 8–
20or
0.87
50–
20U
NEF
22.2
250
1.27
002A
0.03
3022
.192
021
.986
2..
.21
.366
521
.252
20.
1143
20.6
807
2B20
.853
421
.132
821
.399
521
.546
80.
1473
22.2
250
3A0.
0000
22.2
250
22.0
193
...
21.3
995
21.3
131
0.08
6420
.713
73B
20.8
534
21.0
464
21.3
995
21.5
113
0.11
1822
.225
0
7 ⁄ 8–
28or
0.87
50–
28U
N22
.225
00.
9071
2A0.
0305
22.1
945
22.0
294
...
21.6
052
21.5
062
0.09
9121
.115
02B
21.2
344
21.4
630
21.6
357
21.7
653
0.12
9522
.225
03A
0.00
0022
.225
022
.059
9..
.21
.635
721
.562
10.
0737
21.1
455
3B21
.234
421
.402
021
.635
721
.732
20.
0965
22.2
250
7 ⁄ 8–
32or
0.87
50–
32U
N22
.225
00.
7938
2A0.
0279
22.1
971
22.0
447
...
21.6
814
21.5
875
0.09
4021
.252
22B
21.3
614
21.5
646
21.7
094
21.8
313
0.12
1922
.225
03A
0.00
0022
.225
022
.072
6..
.21
.709
421
.638
30.
0711
21.2
801
3B21
.361
421
.511
321
.709
421
.800
80.
0914
22.2
250
15⁄ 16
–12
or0.
9375
–12
UN
23.8
125
2.11
672A
0.04
3223
.769
323
.479
8..
.22
.395
222
.252
90.
1422
21.2
496
2B21
.513
821
.971
022
.438
422
.623
80.
1854
23.8
125
3A0.
0000
23.8
125
23.5
229
...
22.4
384
22.3
317
0.10
6721
.292
83B
21.5
138
21.7
805
22.4
384
22.5
781
0.13
9723
.812
5
15⁄ 16
–16
or0.
9375
–16
UN
23.8
125
1.58
752A
0.03
8123
.774
423
.535
6..
.22
.743
222
.616
20.
1270
21.8
846
2B22
.098
022
.453
622
.781
322
.943
80.
1626
23.8
125
3A0.
0000
23.8
125
23.5
737
...
22.7
813
22.6
873
0.09
4021
.922
73B
22.0
980
22.3
114
22.7
813
22.9
032
0.12
1923
.812
5
15⁄ 16
–20
or0.
9375
–20
UN
EF23
.812
51.
2700
2A0.
0356
23.7
769
23.5
712
...
22.9
514
22.8
371
0.11
4322
.265
62B
22.4
282
22.7
330
22.9
870
23.1
369
0.14
9923
.812
53A
0.00
0023
.812
523
.606
8..
.22
.987
022
.900
60.
0864
22.3
012
3B22
.428
222
.633
922
.987
023
.098
80.
1118
23.8
125
15⁄ 16
–28
or0.
9375
–28
UN
23.8
125
0.90
712A
0.03
0523
.782
023
.616
9..
.23
.192
723
.093
70.
0991
22.7
025
2B22
.834
623
.037
823
.223
223
.352
80.
1295
23.8
125
3A0.
0000
23.8
125
23.6
474
...
23.2
232
23.1
470
0.07
6222
.733
03B
22.8
346
22.9
895
23.2
232
23.3
197
0.09
6523
.812
5
15⁄ 16
–32
or0.
9375
–32
UN
23.8
125
0.79
382A
0.02
7923
.784
623
.632
2..
.23
.268
923
.172
40.
0965
22.8
397
2B22
.961
623
.139
423
.296
923
.421
30.
1245
23.8
125
3A0.
0000
23.8
125
23.6
601
...
23.2
969
23.2
258
0.07
1122
.867
63B
22.9
616
23.0
988
23.2
969
23.3
909
0.09
4023
.812
5
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
106
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
1–8
or1.
0000
–8
UN
C25
.400
03.
1750
1A0.
0508
25.3
492
24.7
777
...
23.2
867
23.0
302
0.25
6521
.569
71B
21.9
710
22.6
060
23.3
375
23.6
728
0.33
5325
.400
02A
0.05
0825
.349
224
.968
224
.777
723
.286
723
.114
00.
1727
21.5
697
2B21
.971
022
.606
023
.337
523
.561
00.
2235
25.4
000
3A0.
0000
25.4
000
25.0
190
...
23.3
375
23.2
080
0.12
9521
.620
53B
21.9
710
22.3
444
23.3
375
23.5
052
0.16
7625
.400
0
1–12
or1.
0000
–12
UN
F25
.400
02.
1167
1A0.
0457
25.3
543
24.9
174
...
23.9
801
23.7
566
0.22
3522
.834
61B
23.1
140
23.5
712
24.0
259
24.3
154
0.28
9625
.400
02A
0.04
5725
.354
325
.064
7..
.23
.980
123
.830
30.
1499
22.8
346
2B23
.114
023
.571
224
.025
924
.218
90.
1930
25.4
000
3A0.
0000
25.4
000
25.1
104
...
24.0
259
23.9
141
0.11
1822
.880
33B
23.1
140
23.3
629
24.0
259
24.1
706
0.14
4825
.400
0
1–14
or1.
0000
–14
UN
S25
.400
01.
8143
2A0.
0406
25.3
594
25.0
977
...
24.1
808
24.0
462
0.13
4623
.197
82B
23.4
442
23.8
252
24.2
214
24.3
967
0.17
5325
.400
0(7
)..
...
.3A
0.00
0025
.400
025
.138
4..
.24
.221
424
.119
80.
1016
23.2
385
3B23
.444
223
.660
124
.221
424
.353
50.
1321
25.4
000
1–16
or1.
0000
–16
UN
25.4
000
1.58
752A
0.03
8125
.361
925
.123
1..
.24
.330
724
.203
70.
1270
23.4
721
2B23
.672
824
.028
424
.368
824
.533
90.
1651
25.4
000
3A0.
0000
25.4
000
25.1
612
...
24.3
688
24.2
748
0.09
4023
.510
23B
23.6
728
23.8
989
24.3
688
24.4
932
0.12
4525
.400
0
1–20
or1.
0000
–20
UN
EF25
.400
01.
2700
2A0.
0356
25.3
644
25.1
587
...
24.5
389
24.4
246
0.11
4323
.853
12B
24.0
284
24.3
078
24.5
745
24.7
244
0.14
9925
.400
03A
0.00
0025
.400
025
.194
3..
.24
.574
524
.488
10.
0864
23.8
887
3B24
.028
424
.221
424
.574
524
.686
30.
1118
25.4
000
1–28
or1.
0000
–28
UN
25.4
000
0.90
712A
0.03
0525
.369
525
.204
4..
.24
.780
224
.678
60.
1016
24.2
900
2B24
.409
424
.638
024
.810
724
.942
80.
1321
25.4
000
3A0.
0000
25.4
000
25.2
349
...
24.8
107
24.7
345
0.07
6224
.320
53B
24.4
094
24.5
770
24.8
107
24.9
098
0.09
9125
.400
0
1–32
or1.
0000
–32
UN
25.4
000
0.79
382A
0.02
7925
.372
125
.219
7..
.24
.856
424
.759
90.
0965
24.4
272
2B24
.536
424
.739
624
.884
425
.008
80.
1245
25.4
000
3A0.
0000
25.4
000
25.2
476
...
24.8
844
24.8
133
0.07
1124
.455
13B
24.5
364
24.6
863
24.8
844
24.9
784
0.09
4025
.400
0
11 ⁄ 16–
8or
1.06
25–
8U
N26
.987
53.
1750
2A0.
0508
26.9
367
26.5
557
...
24.8
742
24.7
015
0.17
2723
.157
22B
23.5
458
24.1
808
24.9
250
25.1
511
0.22
6126
.987
53A
0.00
0026
.987
526
.606
5..
.24
.925
024
.795
50.
1295
23.2
080
3B23
.545
823
.931
924
.925
025
.095
20.
1702
26.9
875
11 ⁄ 16–
12or
1.06
25–
12U
N26
.987
52.
1167
2A0.
0432
26.9
443
26.6
548
...
25.5
702
25.4
254
0.14
4824
.424
62B
24.6
888
25.1
460
25.6
134
25.8
013
0.18
8026
.987
53A
0.00
0026
.987
526
.697
9..
.25
.613
425
.504
10.
1092
24.4
678
3B24
.688
824
.950
425
.613
425
.753
10.
1397
26.9
875
11 ⁄ 16–
16or
1.06
25–
16U
N26
.987
51.
5875
2A0.
0381
26.9
494
26.7
106
...
25.9
182
25.7
912
0.12
7025
.059
62B
25.2
730
25.6
286
25.9
563
26.1
214
0.16
5126
.987
53A
0.00
0026
.987
526
.748
7..
.25
.956
325
.859
70.
0965
25.0
977
3B25
.273
025
.486
425
.956
326
.080
70.
1245
26.9
875
11 ⁄ 16–
18or
1.06
25–
18U
NEF
26.9
875
1.41
112A
0.03
5626
.951
926
.731
0..
.26
.035
025
.913
10.
1219
25.2
705
2B25
.450
825
.781
026
.070
626
.228
00.
1575
26.9
875
3A0.
0000
26.9
875
26.7
665
...
26.0
706
25.9
791
0.09
1425
.306
03B
25.4
508
25.6
667
26.0
706
26.1
899
0.11
9426
.987
5
11 ⁄ 16–
20or
1.06
25–
20U
N26
.987
51.
2700
2A0.
0356
26.9
519
26.7
462
...
26.1
264
26.0
096
0.11
6825
.440
62B
25.6
032
25.9
080
26.1
620
26.3
119
0.14
9926
.987
53A
0.00
0026
.987
526
.781
8..
.26
.162
026
.075
60.
0864
25.4
762
3B25
.603
225
.808
926
.162
026
.276
30.
1143
26.9
875
ASME B1.1-2003 NONMANDATORY APPENDIX C
107
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
11 ⁄ 16–
28or
1.06
25–
28U
N26
.987
50.
9071
2A0.
0305
26.9
570
26.7
919
...
26.3
677
26.2
661
0.10
1625
.877
52B
26.0
096
26.2
128
26.3
982
26.5
303
0.13
2126
.987
53A
0.00
0026
.987
526
.822
4..
.26
.398
226
.322
00.
0762
25.9
080
3B26
.009
626
.164
526
.398
226
.497
30.
0991
26.9
875
11 ⁄ 8–
7or
1.12
50–
7U
NC
28.5
750
3.62
861A
0.05
5928
.519
127
.894
3..
.26
.162
025
.885
10.
2769
24.1
986
1B24
.638
025
.349
226
.217
926
.576
00.
3581
28.5
750
2A0.
0559
28.5
191
28.1
026
27.8
943
26.1
620
25.9
766
0.18
5424
.198
62B
24.6
380
25.3
492
26.2
179
26.4
566
0.23
8828
.575
03A
0.00
0028
.575
028
.158
4..
.26
.217
926
.080
70.
1372
24.2
545
3B24
.638
025
.082
526
.217
926
.398
20.
1803
28.5
750
11 ⁄ 8–
8or
1.12
50–
8U
N28
.575
03.
1750
2A0.
0533
28.5
217
28.1
407
27.9
502
26.4
592
26.2
839
0.17
5324
.742
12B
25.1
460
25.7
810
26.5
125
26.7
411
0.22
8628
.575
03A
0.00
0028
.575
028
.194
0..
.26
.512
526
.380
40.
1321
24.7
955
3B25
.146
025
.519
426
.512
526
.682
70.
1702
28.5
750
11 ⁄ 8–
12or
1.12
50–
12U
NF
28.5
750
2.11
671A
0.04
5728
.529
328
.092
4..
.27
.155
126
.926
50.
2286
26.0
096
1B26
.289
026
.746
227
.200
927
.498
00.
2972
28.5
750
2A0.
0457
28.5
293
28.2
397
...
27.1
551
27.0
027
0.15
2426
.009
62B
26.2
890
26.7
462
27.2
009
27.3
990
0.19
8128
.575
03A
0.00
0028
.575
028
.285
4..
.27
.200
927
.086
60.
1143
26.0
553
3B26
.289
026
.537
927
.200
927
.350
70.
1499
28.5
750
11 ⁄ 8–
16or
1.12
50–
16U
N28
.575
01.
5875
2A0.
0381
28.5
369
28.2
981
...
27.5
057
27.3
787
0.12
7026
.647
12B
26.8
478
27.2
034
27.5
438
27.7
114
0.16
7628
.575
03A
0.00
0028
.575
028
.336
2..
.27
.543
827
.447
20.
0965
26.6
852
3B26
.847
827
.073
927
.543
827
.668
20.
1245
28.5
750
11 ⁄ 8–
18or
1.12
50–
18U
NEF
28.5
750
1.41
112A
0.03
5628
.539
428
.318
5..
.27
.622
527
.500
60.
1219
26.8
580
2B27
.051
027
.381
227
.658
127
.815
50.
1575
28.5
750
3A0.
0000
28.5
750
28.3
540
...
27.6
581
27.5
666
0.09
1426
.893
53B
27.0
510
27.2
542
27.6
581
27.7
774
0.11
9428
.575
0
11 ⁄ 8–
20or
1.12
50–
20U
N28
.575
01.
2700
2A0.
0356
28.5
394
28.3
337
...
27.7
139
27.5
971
0.11
6827
.028
12B
27.2
034
27.4
828
27.7
495
27.9
019
0.15
2428
.575
03A
0.00
0028
.575
028
.369
3..
.27
.749
527
.660
60.
0889
27.0
637
3B27
.203
427
.396
427
.749
527
.863
80.
1143
28.5
750
11 ⁄ 8–
28or
1.12
50–
28U
N28
.575
00.
9071
2A0.
0305
28.5
445
28.3
794
...
27.9
552
27.8
536
0.10
1627
.465
02B
27.5
844
27.8
130
27.9
857
28.1
178
0.13
2128
.575
03A
0.00
0028
.575
028
.409
9..
.27
.985
727
.909
50.
0762
27.4
955
3B27
.584
427
.752
027
.985
728
.084
80.
0991
28.5
750
13 ⁄ 16–
8or
1.18
75–
8U
N30
.162
53.
1750
2A0.
0533
30.1
092
29.7
282
...
28.0
467
27.8
689
0.17
7826
.329
62B
26.7
208
27.3
558
28.1
000
28.3
312
0.23
1130
.162
53A
0.00
0030
.162
529
.781
5..
.28
.100
027
.967
90.
1321
26.3
830
3B26
.720
827
.106
928
.100
028
.272
70.
1727
30.1
625
13 ⁄ 16–
12or
1.18
75–
12U
N30
.162
52.
1167
2A0.
0432
30.1
193
29.8
298
...
28.7
452
28.6
004
0.14
4827
.599
62B
27.8
638
28.3
210
28.7
884
28.9
789
0.19
0530
.162
53A
0.00
0030
.162
529
.872
9..
.28
.788
428
.679
10.
1092
27.6
428
3B27
.863
828
.125
428
.788
428
.930
60.
1422
30.1
625
13 ⁄ 16–
16or
1.18
75–
16U
N30
.162
51.
5875
2A0.
0381
30.1
244
29.8
856
...
29.0
932
28.9
636
0.12
9528
.234
62B
28.4
480
28.8
036
29.1
313
29.2
989
0.16
7630
.162
53A
0.00
0030
.162
529
.923
7..
.29
.131
329
.034
70.
0965
28.2
727
3B28
.448
028
.661
429
.131
329
.255
70.
1245
30.1
625
13 ⁄ 16–
18or
1.18
75–
18U
NEF
30.1
625
1.41
112A
0.03
5630
.126
929
.906
0..
.29
.210
029
.088
10.
1219
28.4
455
2B28
.625
828
.956
029
.245
629
.405
60.
1600
30.1
625
3A0.
0000
30.1
625
29.9
415
...
29.2
456
29.1
541
0.09
1428
.481
03B
28.6
258
28.8
417
29.2
456
29.3
649
0.11
9430
.162
5
13 ⁄ 16–
20or
1.18
75–
20U
N30
.162
51.
2700
2A0.
0356
30.1
269
29.9
212
...
29.3
014
29.1
846
0.11
6828
.615
62B
28.7
782
29.0
830
29.3
370
29.4
894
0.15
2430
.162
53A
0.00
0030
.162
529
.956
8..
.29
.337
029
.248
10.
0889
28.6
512
3B28
.778
228
.983
929
.337
029
.451
30.
1143
30.1
625
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
108
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
13 ⁄ 16–
28or
1.18
75–
28U
N30
.162
50.
9071
2A0.
0305
30.1
320
29.9
669
...
29.5
427
29.4
386
0.10
4129
.052
52B
29.1
846
29.3
878
29.5
732
29.7
078
0.13
4630
.162
53A
0.00
0030
.162
529
.997
4..
.29
.573
229
.494
50.
0787
29.0
830
3B29
.184
629
.339
529
.573
229
.674
80.
1016
30.1
625
11 ⁄ 4–
7or
1.25
00–
7U
NC
31.7
500
3.62
861A
0.05
5931
.694
131
.069
3..
.29
.337
029
.055
10.
2819
27.3
736
1B27
.813
028
.524
229
.392
929
.758
60.
3658
31.7
500
2A0.
0559
31.6
941
31.2
776
31.0
693
29.3
370
29.1
490
0.18
8027
.373
62B
27.8
130
28.5
242
29.3
929
29.6
367
0.24
3831
.750
03A
0.00
0031
.750
031
.333
4..
.29
.392
929
.253
20.
1397
27.4
295
3B27
.813
028
.257
529
.392
929
.575
80.
1829
31.7
500
11 ⁄ 4–
8or
1.25
00–
8U
N31
.750
03.
1750
2A0.
0533
31.6
967
31.3
157
31.1
252
29.6
342
29.4
564
0.17
7827
.917
12B
28.3
210
28.9
560
29.6
875
29.9
212
0.23
3731
.750
03A
0.00
0031
.750
031
.369
0..
.29
.687
529
.552
90.
1346
27.9
705
3B28
.321
028
.694
429
.687
529
.862
80.
1753
31.7
500
11 ⁄ 4–
12or
1.25
00–
12U
NF
31.7
500
2.11
671A
0.04
5731
.704
331
.267
4..
.30
.330
130
.096
50.
2337
29.1
846
1B29
.464
029
.921
230
.375
930
.680
70.
3048
31.7
500
2A0.
0457
31.7
043
31.4
147
...
30.3
301
30.1
727
0.15
7529
.184
62B
29.4
640
29.9
212
30.3
759
30.5
791
0.20
3231
.750
03A
0.00
0031
.750
031
.460
4..
.30
.375
930
.259
00.
1168
29.2
303
3B29
.464
029
.712
930
.375
930
.528
30.
1524
31.7
500
11 ⁄ 4–
16or
1.25
00–
16U
N31
.750
01.
5875
2A0.
0381
31.7
119
31.4
731
...
30.6
807
30.5
511
0.12
9529
.822
12B
30.0
228
30.3
784
30.7
188
30.8
864
0.16
7631
.750
03A
0.00
0031
.750
031
.511
2..
.30
.718
830
.622
20.
0965
29.8
602
3B30
.022
830
.248
930
.718
830
.845
80.
1270
31.7
500
11 ⁄ 4–
18or
1.25
00–
18U
NEF
31.7
500
1.41
112A
0.03
8131
.711
931
.490
9..
.30
.795
030
.670
50.
1245
30.0
304
2B30
.226
030
.556
230
.833
130
.993
10.
1600
31.7
500
3A0.
0000
31.7
500
31.5
290
...
30.8
331
30.7
416
0.09
1430
.068
53B
30.2
260
30.4
292
30.8
331
30.9
524
0.11
9431
.750
0
11 ⁄ 4–
20or
1.25
00–
20U
N31
.750
01.
2700
2A0.
0356
31.7
144
31.5
087
...
30.8
889
30.7
696
0.11
9430
.203
12B
30.3
784
30.6
578
30.9
245
31.0
794
0.15
4931
.750
03A
0.00
0031
.750
031
.544
3..
.30
.924
530
.835
60.
0889
30.2
387
3B30
.378
430
.571
430
.924
531
.038
80.
1143
31.7
500
11 ⁄ 4–
28or
1.25
00–
28U
N31
.750
00.
9071
2A0.
0305
31.7
195
31.5
544
...
31.1
302
31.0
261
0.10
4130
.640
02B
30.7
594
30.9
880
31.1
607
31.2
953
0.13
4631
.750
03A
0.00
0031
.750
031
.584
9..
.31
.160
731
.082
00.
0787
30.6
705
3B30
.759
430
.927
031
.160
731
.262
30.
1016
31.7
500
15 ⁄ 16–
8or
1.31
25–
8U
N33
.337
53.
1750
2A0.
0533
33.2
842
32.9
032
...
31.2
217
31.0
413
0.18
0329
.504
62B
29.8
958
30.5
308
31.2
750
31.5
087
0.23
3733
.337
53A
0.00
0033
.337
532
.956
5..
.31
.275
031
.140
40.
1346
29.5
580
3B29
.895
830
.281
931
.275
031
.450
30.
1753
33.3
375
15 ⁄ 16–
12or
1.31
25–
12U
N33
.337
52.
1167
2A0.
0432
33.2
943
33.0
048
...
31.9
202
31.7
729
0.14
7330
.774
62B
31.0
388
31.4
960
31.9
634
32.1
539
0.19
0533
.337
53A
0.00
0033
.337
533
.047
9..
.31
.963
431
.851
60.
1118
30.8
178
3B31
.038
831
.300
431
.963
432
.108
10.
1448
33.3
375
15 ⁄ 16–
16or
1.31
25–
16U
N33
.337
51.
5875
2A0.
0381
33.2
994
33.0
606
...
32.2
682
32.1
386
0.12
9531
.409
62B
31.6
230
31.9
786
32.3
063
32.4
764
0.17
0233
.337
53A
0.00
0033
.337
533
.098
7..
.32
.306
332
.209
70.
0965
31.4
477
3B31
.623
031
.836
432
.306
332
.433
30.
1270
33.3
375
15 ⁄ 16–
18or
1.31
25–
18U
NEF
33.3
375
1.41
112A
0.03
8133
.299
433
.078
4..
.32
.382
532
.258
00.
1245
31.6
179
2B31
.800
832
.131
032
.420
632
.583
10.
1626
33.3
375
3A0.
0000
33.3
375
33.1
165
...
32.4
206
32.3
266
0.09
4031
.656
03B
31.8
008
32.0
167
32.4
206
32.5
425
0.12
1933
.337
5
15 ⁄ 16–
20or
1.31
25–
20U
N33
.337
51.
2700
2A0.
0356
33.3
019
33.0
962
...
32.4
764
32.3
571
0.11
9431
.790
62B
31.9
532
32.2
580
32.5
120
32.6
669
0.15
4933
.337
53A
0.00
0033
.337
533
.131
8..
.32
.512
032
.423
10.
0889
31.8
262
3B31
.953
232
.158
932
.512
032
.628
80.
1168
33.3
375
ASME B1.1-2003 NONMANDATORY APPENDIX C
109
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
15 ⁄ 16–
28or
1.31
25–
28U
N33
.337
50.
9071
2A0.
0305
33.3
070
33.1
419
...
32.7
177
32.6
136
0.10
4132
.227
52B
32.3
596
32.5
628
32.7
482
32.8
854
0.13
7233
.337
53A
0.00
0033
.337
533
.172
4..
.32
.748
232
.669
50.
0787
32.2
580
3B32
.359
632
.514
532
.748
232
.849
80.
1016
33.3
375
13 ⁄ 8–
6or
1.37
50–
6U
NC
34.9
250
4.23
331A
0.06
1034
.864
034
.170
6..
.32
.113
231
.808
40.
3048
29.8
221
1B30
.353
031
.115
032
.174
232
.567
90.
3937
34.9
250
2A0.
0610
34.8
640
34.4
018
34.1
706
32.1
132
31.9
100
0.20
3229
.822
12B
30.3
530
31.1
150
32.1
742
32.4
383
0.26
4234
.925
03A
0.00
0034
.925
034
.462
7..
.32
.174
232
.021
80.
1524
29.8
831
3B30
.353
030
.850
832
.174
232
.372
30.
1981
34.9
250
13 ⁄ 8–
8or
1.37
50–
8U
N34
.925
03.
1750
2A0.
0559
34.8
691
34.4
881
34.2
976
32.8
066
32.6
238
0.18
2931
.089
62B
31.4
960
32.1
310
32.8
625
33.0
987
0.23
6234
.925
03A
0.00
0034
.925
034
.544
0..
.32
.862
532
.725
40.
1372
31.1
455
3B31
.496
031
.869
432
.862
533
.040
30.
1778
34.9
250
13 ⁄ 8–
12or
1.37
50–
12U
NF
34.9
250
2.11
671A
0.04
8334
.876
734
.439
9..
.33
.502
633
.263
80.
2388
32.3
571
1B32
.639
033
.096
233
.550
933
.863
30.
3124
34.9
250
2A0.
0483
34.8
767
34.5
872
...
33.5
026
33.3
426
0.16
0032
.357
12B
32.6
390
33.0
962
33.5
509
33.7
591
0.20
8334
.925
03A
0.00
0034
.925
034
.635
4..
.33
.550
933
.431
50.
1194
32.4
053
3B32
.639
032
.887
933
.550
933
.705
80.
1549
34.9
250
13 ⁄ 8–
16or
1.37
50–
16U
N34
.925
01.
5875
2A0.
0381
34.8
869
34.6
481
...
33.8
557
33.7
236
0.13
2132
.997
12B
33.1
978
33.5
534
33.8
938
34.0
639
0.17
0234
.925
03A
0.00
0034
.925
034
.686
2..
.33
.893
833
.794
70.
0991
33.0
352
3B33
.197
833
.423
933
.893
834
.020
80.
1270
34.9
250
13 ⁄ 8–
18or
1.37
50–
18U
NEF
34.9
250
1.41
112A
0.03
8134
.886
934
.665
9..
.33
.970
033
.845
50.
1245
33.2
054
2B33
.401
033
.731
234
.008
134
.170
60.
1626
34.9
250
3A0.
0000
34.9
250
34.7
040
...
34.0
081
33.9
141
0.09
4033
.243
53B
33.4
010
33.6
042
34.0
081
34.1
300
0.12
1934
.925
0
13 ⁄ 8–
20or
1.37
50–
20U
N34
.925
01.
2700
2A0.
0356
34.8
894
34.6
837
...
34.0
639
33.9
446
0.11
9433
.378
12B
33.5
534
33.8
328
34.0
995
34.2
544
0.15
4934
.925
03A
0.00
0034
.925
034
.719
3..
.34
.099
534
.010
60.
0889
33.4
137
3B33
.553
433
.746
434
.099
534
.216
30.
1168
34.9
250
13 ⁄ 8–
28or
1.37
50–
28U
N34
.925
00.
9071
2A0.
0305
34.8
945
34.7
294
...
34.3
052
34.2
011
0.10
4133
.815
02B
33.9
344
34.1
630
34.3
357
34.4
729
0.13
7234
.925
03A
0.00
0034
.925
034
.759
9..
.34
.335
734
.257
00.
0787
33.8
455
3B33
.934
434
.102
034
.335
734
.437
30.
1016
34.9
250
17 ⁄ 16–
6or
1.43
75–
6U
N36
.512
54.
2333
2A0.
0610
36.4
515
35.9
893
...
33.7
007
33.4
975
0.20
3231
.409
62B
31.9
278
32.7
152
33.7
617
34.0
258
0.26
4236
.512
53A
0.00
0036
.512
536
.050
2..
.33
.761
733
.609
30.
1524
31.4
706
3B31
.927
832
.438
333
.761
733
.959
80.
1981
36.5
125
17 ⁄ 16–
8or
1.43
75–
8U
N36
.512
53.
1750
2A0.
0559
36.4
566
36.0
756
...
34.3
941
34.2
113
0.18
2932
.677
12B
33.0
708
33.7
058
34.4
500
34.6
888
0.23
8836
.512
53A
0.00
0036
.512
536
.131
5..
.34
.450
034
.312
90.
1372
32.7
330
3B33
.070
833
.456
934
.450
034
.630
40.
1803
36.5
125
17 ⁄ 16–
12or
1.43
75–
12U
N36
.512
52.
1167
2A0.
0457
36.4
668
36.1
772
...
35.0
926
34.9
428
0.14
9933
.947
12B
34.2
138
34.6
710
35.1
384
35.3
314
0.19
3036
.512
53A
0.00
0036
.512
536
.222
9..
.35
.138
435
.026
60.
1118
33.9
928
3B34
.213
834
.475
435
.138
435
.283
10.
1448
36.5
125
17 ⁄ 16–
16or
1.43
75–
16U
N36
.512
51.
5875
2A0.
0406
36.4
719
36.2
331
...
35.4
406
35.3
085
0.13
2134
.582
12B
34.7
980
35.1
536
35.4
813
35.6
514
0.17
0236
.512
53A
0.00
0036
.512
536
.273
7..
.35
.481
335
.382
20.
0991
34.6
227
3B34
.798
035
.011
435
.481
335
.610
80.
1295
36.5
125
17 ⁄ 16–
18or
1.43
75–
18U
NEF
36.5
125
1.41
112A
0.03
8136
.474
436
.253
4..
.35
.557
535
.433
00.
1245
34.7
929
2B34
.975
835
.306
035
.595
635
.758
10.
1626
36.5
125
3A0.
0000
36.5
125
36.2
915
...
35.5
956
35.5
016
0.09
4034
.831
03B
34.9
758
35.1
917
35.5
956
35.7
175
0.12
1936
.512
5
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
110
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
17 ⁄ 16–
20or
1.43
75–
20U
N36
.512
51.
2700
2A0.
0356
36.4
769
36.2
712
...
35.6
514
35.5
321
0.11
9434
.965
62B
35.1
282
35.4
330
35.6
870
35.8
445
0.15
7536
.512
53A
0.00
0036
.512
536
.306
8..
.35
.687
035
.595
60.
0914
35.0
012
3B35
.128
235
.333
935
.687
035
.803
80.
1168
36.5
125
17 ⁄ 16–
28or
1.43
75–
28U
N36
.512
50.
9071
2A0.
0330
36.4
795
36.3
144
...
35.8
902
35.7
835
0.10
6735
.400
02B
35.5
346
35.7
378
35.9
232
36.0
604
0.13
7236
.512
53A
0.00
0036
.512
536
.347
4..
.35
.923
235
.844
50.
0787
35.4
330
3B35
.534
635
.689
535
.923
236
.027
40.
1041
36.5
125
11 ⁄ 2–
6or
1.50
00–
6U
NC
38.1
000
4.23
331A
0.06
1038
.039
037
.345
6..
.35
.288
234
.980
90.
3073
32.9
971
1B33
.528
034
.290
035
.349
235
.750
50.
4013
38.1
000
2A0.
0610
38.0
390
37.5
768
37.3
456
35.2
882
35.0
825
0.20
5732
.997
12B
33.5
280
34.2
900
35.3
492
35.6
159
0.26
6738
.100
03A
0.00
0038
.100
037
.637
7..
.35
.349
235
.194
20.
1549
33.0
581
3B33
.528
034
.025
835
.349
235
.549
80.
2007
38.1
000
11 ⁄ 2–
8or
1.50
00–
8U
N38
.100
03.
1750
2A0.
0559
38.0
441
37.6
631
37.4
726
35.9
816
35.7
962
0.18
5434
.264
62B
34.6
710
35.3
060
36.0
375
36.2
788
0.24
1338
.100
03A
0.00
0038
.100
037
.719
0..
.36
.037
535
.897
80.
1397
34.3
205
3B34
.671
035
.044
436
.037
536
.217
90.
1803
38.1
000
11 ⁄ 2–
12or
1.50
00–
12U
NF
38.1
000
2.11
671A
0.04
8338
.051
737
.614
9..
.36
.677
636
.433
80.
2438
35.5
321
1B35
.814
036
.271
236
.725
937
.043
40.
3175
38.1
000
2A0.
0483
38.0
517
37.7
622
...
36.6
776
36.5
150
0.16
2635
.532
12B
35.8
140
36.2
712
36.7
259
36.9
367
0.21
0838
.100
03A
0.00
0038
.100
037
.810
4..
.36
.725
936
.603
90.
1219
35.5
803
3B35
.814
036
.062
936
.725
936
.885
90.
1600
38.1
000
11 ⁄ 2–
16or
1.50
00–
16U
N38
.100
01.
5875
2A0.
0406
38.0
594
37.8
206
...
37.0
281
36.8
960
0.13
2136
.169
62B
36.3
728
36.7
284
37.0
688
37.2
415
0.17
2738
.100
03A
0.00
0038
.100
037
.861
2..
.37
.068
836
.969
70.
0991
36.2
102
3B36
.372
836
.598
937
.068
837
.198
30.
1295
38.1
000
11 ⁄ 2–
18or
1.50
00–
18U
NEF
38.1
000
1.41
112A
0.03
8138
.061
937
.840
9..
.37
.145
037
.018
00.
1270
36.3
804
2B36
.576
036
.906
237
.183
137
.348
20.
1651
38.1
000
3A0.
0000
38.1
000
37.8
790
...
37.1
831
37.0
891
0.09
4036
.418
53B
36.5
760
36.7
792
37.1
831
37.3
050
0.12
1938
.100
0
11 ⁄ 2–
20or
1.50
00–
20U
N38
.100
01.
2700
2A0.
0356
38.0
644
37.8
587
...
37.2
389
37.1
170
0.12
1936
.553
12B
36.7
284
37.0
078
37.2
745
37.4
320
0.15
7538
.100
03A
0.00
0038
.100
037
.894
3..
.37
.274
537
.183
10.
0914
36.5
887
3B36
.728
436
.921
437
.274
537
.391
30.
1168
38.1
000
11 ⁄ 2–
28or
1.50
00–
28U
N38
.100
00.
9071
2A0.
0330
38.0
670
37.9
019
...
37.4
777
37.3
710
0.10
6736
.987
52B
37.1
094
37.3
380
37.5
107
37.6
504
0.13
9738
.100
03A
0.00
0038
.100
037
.934
9..
.37
.510
737
.432
00.
0787
37.0
205
3B37
.109
437
.277
037
.510
737
.614
90.
1041
38.1
000
19 ⁄ 16–
6or
1.56
25–
6U
N39
.687
54.
2333
2A0.
0610
39.6
265
39.1
643
...
36.8
757
36.6
674
0.20
8334
.584
62B
35.1
028
35.8
902
36.9
367
37.2
059
0.26
9239
.687
53A
0.00
0039
.687
539
.225
2..
.36
.936
736
.781
70.
1549
34.6
456
3B35
.102
835
.613
336
.936
737
.139
90.
2032
39.6
875
19 ⁄ 16–
8or
1.56
25–
8U
N39
.687
53.
1750
2A0.
0559
39.6
316
39.2
506
...
37.5
691
37.3
812
0.18
8035
.852
12B
36.2
458
36.8
808
37.6
250
37.8
689
0.24
3839
.687
53A
0.00
0039
.687
539
.306
5..
.37
.625
037
.485
30.
1397
35.9
080
3B36
.245
836
.631
937
.625
037
.807
90.
1829
39.6
875
19 ⁄ 16–
12or
1.56
25–
12U
N39
.687
52.
1167
2A0.
0457
39.6
418
39.3
522
...
38.2
676
38.1
178
0.14
9937
.122
12B
37.3
888
37.8
460
38.3
134
38.5
089
0.19
5639
.687
53A
0.00
0039
.687
539
.397
9..
.38
.313
438
.201
60.
1118
37.1
678
3B37
.388
837
.650
438
.313
438
.460
70.
1473
39.6
875
19 ⁄ 16–
16or
1.56
25–
16U
N39
.687
51.
5875
2A0.
0406
39.6
469
39.4
081
...
38.6
156
38.4
835
0.13
2137
.757
12B
37.9
730
38.3
286
38.6
563
38.8
290
0.17
2739
.687
53A
0.00
0039
.687
539
.448
7..
.38
.656
338
.557
20.
0991
37.7
977
3B37
.973
038
.186
438
.656
338
.785
80.
1295
39.6
875
ASME B1.1-2003 NONMANDATORY APPENDIX C
111
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
19 ⁄ 16–
18or
1.56
25–
18U
NEF
39.6
875
1.41
112A
0.03
8139
.649
439
.428
4..
.38
.732
538
.605
50.
1270
37.9
679
2B38
.150
838
.481
038
.770
638
.935
70.
1651
39.6
875
3A0.
0000
39.6
875
39.4
665
...
38.7
706
38.6
766
0.09
4038
.006
03B
38.1
508
38.3
667
38.7
706
38.8
950
0.12
4539
.687
5
19 ⁄ 16–
20or
1.56
25–
20U
N39
.687
51.
2700
2A0.
0356
39.6
519
39.4
462
...
38.8
264
38.7
045
0.12
1938
.140
62B
38.3
032
38.6
080
38.8
620
39.0
195
0.15
7539
.687
53A
0.00
0039
.687
539
.481
8..
.38
.862
038
.770
60.
0914
38.1
762
3B38
.303
238
.508
938
.862
038
.981
40.
1194
39.6
875
15 ⁄ 8–
6or
1.62
50–
6U
N41
.275
04.
2333
2A0.
0635
41.2
115
40.7
492
...
38.4
607
38.2
524
0.20
8336
.169
62B
36.7
030
37.4
650
38.5
242
38.7
960
0.27
1841
.275
03A
0.00
0041
.275
040
.812
7..
.38
.524
238
.366
70.
1575
36.2
331
3B36
.703
037
.200
838
.524
238
.727
40.
2032
41.2
750
15 ⁄ 8–
8or
1.62
50–
8U
N41
.275
03.
1750
2A0.
0559
41.2
191
40.8
381
40.6
476
39.1
566
38.9
687
0.18
8037
.439
62B
37.8
460
38.4
810
39.2
125
39.4
589
0.24
6441
.275
03A
0.00
0041
.275
040
.894
0..
.39
.212
539
.070
30.
1422
37.4
955
3B37
.846
038
.219
439
.212
539
.395
40.
1829
41.2
750
15 ⁄ 8–
12or
1.62
50–
12U
N41
.275
02.
1167
2A0.
0457
41.2
293
40.9
397
...
39.8
551
39.7
053
0.14
9938
.709
62B
38.9
890
39.4
462
39.9
009
40.0
964
0.19
5641
.275
03A
0.00
0041
.275
040
.985
4..
.39
.900
939
.789
10.
1118
38.7
553
3B38
.989
039
.237
939
.900
940
.048
20.
1473
41.2
750
15 ⁄ 8–
16or
1.62
50–
16U
N41
.275
01.
5875
2A0.
0406
41.2
344
40.9
956
...
40.2
031
40.0
685
0.13
4639
.344
62B
39.5
478
39.9
034
40.2
438
40.4
165
0.17
2741
.275
03A
0.00
0041
.275
041
.036
2..
.40
.243
840
.144
70.
0991
39.3
852
3B39
.547
839
.773
940
.243
840
.373
30.
1295
41.2
750
15 ⁄ 8–
18or
1.62
50–
18U
NEF
41.2
750
1.41
112A
0.03
8141
.236
941
.015
9..
.40
.320
040
.193
00.
1270
39.5
554
2B39
.751
040
.081
240
.358
140
.523
20.
1651
41.2
750
3A0.
0000
41.2
750
41.0
540
...
40.3
581
40.2
615
0.09
6539
.593
53B
39.7
510
39.9
542
40.3
581
40.4
825
0.12
4541
.275
0
15 ⁄ 8–
20or
1.62
50–
20U
N41
.275
01.
2700
2A0.
0356
41.2
394
41.0
337
...
40.4
139
40.2
920
0.12
1939
.728
12B
39.9
034
40.1
828
40.4
495
40.6
070
0.15
7541
.275
03A
0.00
0041
.275
041
.069
3..
.40
.449
540
.358
10.
0914
39.7
637
3B39
.903
440
.096
440
.449
540
.568
90.
1194
41.2
750
111⁄ 16
–6
or1.
6875
–6
UN
42.8
625
4.23
332A
0.06
3542
.799
042
.336
7..
.40
.048
239
.837
40.
2108
37.7
571
2B38
.277
839
.065
240
.111
740
.386
00.
2743
42.8
625
3A0.
0000
42.8
625
42.4
002
...
40.1
117
39.9
542
0.15
7537
.820
63B
38.2
778
38.7
883
40.1
117
40.3
174
0.20
5742
.862
5
111⁄ 16
–8
or1.
6875
–8
UN
42.8
625
3.17
502A
0.05
5942
.806
642
.425
6..
.40
.744
140
.553
60.
1905
39.0
271
2B39
.420
840
.055
840
.800
041
.046
40.
2464
42.8
625
3A0.
0000
42.8
625
42.4
815
...
40.8
000
40.6
578
0.14
2239
.083
03B
39.4
208
39.8
069
40.8
000
40.9
854
0.18
5442
.862
5
111⁄ 16
–12
or1.
6875
–12
UN
42.8
625
2.11
672A
0.04
5742
.816
842
.527
2..
.41
.442
641
.292
80.
1499
40.2
971
2B40
.563
841
.021
041
.488
441
.683
90.
1956
42.8
625
3A0.
0000
42.8
625
42.5
729
...
41.4
884
41.3
741
0.11
4340
.342
83B
40.5
638
40.8
254
41.4
884
41.6
357
0.14
7342
.862
5
111⁄ 16
–16
or1.
6875
–16
UN
42.8
625
1.58
752A
0.04
0642
.821
942
.583
1..
.41
.790
641
.656
00.
1346
40.9
321
2B41
.148
041
.503
641
.831
342
.006
50.
1753
42.8
625
3A0.
0000
42.8
625
42.6
237
...
41.8
313
41.7
297
0.10
1640
.972
73B
41.1
480
41.3
614
41.8
313
41.9
608
0.12
9542
.862
5
111⁄ 16
–18
or1.
6875
–18
UN
EF42
.862
51.
4111
2A0.
0381
42.8
244
42.6
034
...
41.9
075
41.7
805
0.12
7041
.142
92B
41.3
258
41.6
560
41.9
456
42.1
107
0.16
5142
.862
53A
0.00
0042
.862
542
.641
5..
.41
.945
641
.849
00.
0965
41.1
810
3B41
.325
841
.541
741
.945
642
.070
00.
1245
42.8
625
111⁄ 16
–20
or1.
6875
–20
UN
42.8
625
1.27
002A
0.03
5642
.826
942
.621
2..
.42
.001
441
.879
50.
1219
41.3
156
2B41
.478
241
.783
042
.037
042
.197
00.
1600
42.8
625
3A0.
0000
42.8
625
42.6
568
...
42.0
370
41.9
456
0.09
1441
.351
23B
41.4
782
41.6
839
42.0
370
42.1
564
0.11
9442
.862
5
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
112
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
13 ⁄ 4–
5or
1.75
00–
5U
NC
44.4
500
5.08
001A
0.06
8644
.381
443
.599
1..
.41
.082
040
.741
60.
3404
38.3
311
1B38
.938
239
.801
841
.150
541
.592
50.
4420
44.4
500
2A0.
0686
44.3
814
43.8
607
43.5
991
41.0
820
40.8
559
0.22
6138
.331
12B
38.9
382
39.8
018
41.1
505
41.4
452
0.29
4644
.450
03A
0.00
0044
.450
043
.929
3..
.41
.150
540
.980
40.
1702
38.3
997
3B38
.938
239
.560
541
.150
541
.371
50.
2210
44.4
500
13 ⁄ 4–
6or
1.75
00–
6U
N44
.450
04.
2333
2A0.
0635
44.3
865
43.9
242
...
41.6
357
41.4
249
0.21
0839
.344
62B
39.8
780
40.6
400
41.6
992
41.9
735
0.27
4344
.450
03A
0.00
0044
.450
043
.987
7..
.41
.699
241
.539
20.
1600
39.4
081
3B39
.878
040
.375
841
.699
241
.904
90.
2057
44.4
500
13 ⁄ 4–
8or
1.75
00–
8U
N44
.450
03.
1750
2A0.
0584
44.3
916
44.0
106
43.8
201
42.3
291
42.1
386
0.19
0540
.612
12B
41.0
210
41.6
560
42.3
875
42.6
364
0.24
8944
.450
03A
0.00
0044
.450
044
.069
0..
.42
.387
542
.242
70.
1448
40.6
705
3B41
.021
041
.394
442
.387
542
.575
50.
1880
44.4
500
13 ⁄ 4–
12or
1.75
00–
12U
N44
.450
02.
1167
2A0.
0457
44.4
043
44.1
147
...
43.0
301
42.8
777
0.15
2441
.884
62B
42.1
640
42.6
212
43.0
759
43.2
740
0.19
8144
.450
03A
0.00
0044
.450
044
.160
4..
.43
.075
942
.961
60.
1143
41.9
303
3B42
.164
042
.412
943
.075
943
.223
20.
1473
44.4
500
13 ⁄ 4–
16or
1.75
00–
16U
N44
.450
01.
5875
2A0.
0406
44.4
094
44.1
706
...
43.3
781
43.2
435
0.13
4642
.519
62B
42.7
228
43.0
784
43.4
188
43.5
940
0.17
5344
.450
03A
0.00
0044
.450
044
.211
2..
.43
.418
843
.317
20.
1016
42.5
602
3B42
.722
842
.948
943
.418
843
.550
80.
1321
44.4
500
13 ⁄ 4–
20or
1.75
00–
20U
N44
.450
01.
2700
2A0.
0381
44.4
119
44.2
062
...
43.5
864
43.4
619
0.12
4542
.900
62B
43.0
784
43.3
578
43.6
245
43.7
845
0.16
0044
.450
03A
0.00
0044
.450
044
.244
3..
.43
.624
543
.533
10.
0914
42.9
387
3B43
.078
443
.271
443
.624
543
.743
90.
1194
44.4
500
113⁄ 16
–6
or1.
8125
–6
UN
46.0
375
4.23
332A
0.06
3545
.974
045
.511
7..
.43
.223
243
.009
80.
2134
40.9
321
2B41
.452
842
.240
243
.286
743
.563
50.
2769
46.0
375
3A0.
0000
46.0
375
45.5
752
...
43.2
867
43.1
267
0.16
0040
.995
63B
41.4
528
41.9
633
43.2
867
43.4
950
0.20
8346
.037
5
113⁄ 16
–8
or1.
8125
–8
UN
46.0
375
3.17
502A
0.05
8445
.979
145
.598
1..
.43
.916
643
.723
60.
1930
42.1
996
2B42
.595
843
.230
843
.975
044
.226
50.
2515
46.0
375
3A0.
0000
46.0
375
45.6
565
...
43.9
750
43.8
302
0.14
4842
.258
03B
42.5
958
42.9
819
43.9
750
44.1
630
0.18
8046
.037
5
113⁄ 16
–12
or1.
8125
–12
UN
46.0
375
2.11
672A
0.04
5745
.991
845
.702
2..
.44
.617
644
.465
20.
1524
43.4
721
2B43
.738
844
.196
044
.663
444
.861
50.
1981
46.0
375
3A0.
0000
46.0
375
45.7
479
...
44.6
634
44.5
491
0.11
4343
.517
83B
43.7
388
44.0
004
44.6
634
44.8
107
0.14
7346
.037
5
113⁄ 16
–16
or1.
8125
–16
UN
46.0
375
1.58
752A
0.04
0645
.996
945
.758
1..
.44
.965
644
.831
00.
1346
44.1
071
2B44
.323
044
.678
645
.006
345
.181
50.
1753
46.0
375
3A0.
0000
46.0
375
45.7
987
...
45.0
063
44.9
047
0.10
1644
.147
73B
44.3
230
44.5
364
45.0
063
45.1
383
0.13
2146
.037
5
113⁄ 16
–20
or1.
8125
–20
UN
46.0
375
1.27
002A
0.03
8145
.999
445
.793
7..
.45
.173
945
.049
40.
1245
44.4
881
2B44
.653
244
.958
045
.212
045
.372
00.
1600
46.0
375
3A0.
0000
46.0
375
45.8
318
...
45.2
120
45.1
180
0.09
4044
.526
23B
44.6
532
44.8
589
45.2
120
45.3
314
0.11
9446
.037
5
17 ⁄ 8–
6or
1.87
50–
6U
N47
.625
04.
2333
2A0.
0635
47.5
615
47.0
992
...
44.8
107
44.5
973
0.21
3442
.519
62B
43.0
530
43.8
150
44.8
742
45.1
536
0.27
9447
.625
03A
0.00
0047
.625
047
.162
7..
.44
.874
244
.714
20.
1600
42.5
831
3B43
.053
043
.550
844
.874
245
.082
50.
2083
47.6
250
17 ⁄ 8–
8or
1.87
50–
8U
N47
.625
03.
1750
2A0.
0584
47.5
666
47.1
856
46.9
951
45.5
041
45.3
085
0.19
5643
.787
12B
44.1
960
44.8
310
45.5
625
45.8
165
0.25
4047
.625
03A
0.00
0047
.625
047
.244
0..
.45
.562
545
.417
70.
1448
43.8
455
3B44
.196
044
.569
445
.562
545
.753
00.
1905
47.6
250
ASME B1.1-2003 NONMANDATORY APPENDIX C
113
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
17 ⁄ 8–
12or
1.87
50–
12U
N47
.625
02.
1167
2A0.
0457
47.5
793
47.2
897
...
46.2
051
46.0
527
0.15
2445
.059
62B
45.3
390
45.7
962
46.2
509
46.4
490
0.19
8147
.625
03A
0.00
0047
.625
047
.335
4..
.46
.250
946
.136
60.
1143
45.1
053
3B45
.339
045
.587
946
.250
946
.400
70.
1499
47.6
250
17 ⁄ 8–
16or
1.87
50–
16U
N47
.625
01.
5875
2A0.
0406
47.5
844
47.3
456
...
46.5
531
46.4
185
0.13
4645
.694
62B
45.8
978
46.2
534
46.5
938
46.7
690
0.17
5347
.625
03A
0.00
0047
.625
047
.386
2..
.46
.593
846
.492
20.
1016
45.7
352
3B45
.897
846
.123
946
.593
846
.725
80.
1321
47.6
250
17 ⁄ 8–
20or
1.87
50–
20U
N47
.625
01.
2700
2A0.
0381
47.5
869
47.3
812
...
46.7
614
46.6
369
0.12
4546
.075
62B
46.2
534
46.5
328
46.7
995
46.9
621
0.16
2647
.625
03A
0.00
0047
.625
047
.419
3..
.46
.799
546
.705
50.
0940
46.1
137
3B46
.253
446
.446
446
.799
546
.921
40.
1219
47.6
250
115⁄ 16
–6
or1.
9375
–6
UN
49.2
125
4.23
332A
0.06
6049
.146
548
.684
2..
.46
.395
646
.179
70.
2159
44.1
046
2B44
.627
845
.415
246
.461
746
.743
60.
2819
49.2
125
3A0.
0000
49.2
125
48.7
502
...
46.4
617
46.2
991
0.16
2644
.170
63B
44.6
278
45.1
383
46.4
617
46.6
725
0.21
0849
.212
5
115⁄ 16
–8
or1.
9375
–8
UN
49.2
125
3.17
502A
0.05
8449
.154
148
.773
1..
.47
.091
646
.896
00.
1956
45.3
746
2B45
.770
846
.405
847
.150
047
.404
00.
2540
49.2
125
3A0.
0000
49.2
125
48.8
315
...
47.1
500
47.0
027
0.14
7345
.433
03B
45.7
708
46.1
569
47.1
500
47.3
405
0.19
0549
.212
5
115⁄ 16
–12
or1.
9375
–12
UN
49.2
125
2.11
672A
0.04
5749
.166
848
.877
2..
.47
.792
647
.640
20.
1524
46.6
471
2B46
.913
847
.371
047
.838
448
.036
50.
1981
49.2
125
3A0.
0000
49.2
125
48.9
229
...
47.8
384
47.7
241
0.11
4346
.692
83B
46.9
138
47.1
754
47.8
384
47.9
882
0.14
9949
.212
5
115⁄ 16
–16
or1.
9375
–16
UN
49.2
125
1.58
752A
0.04
0649
.171
948
.933
1..
.48
.140
648
.003
50.
1372
47.2
821
2B47
.498
047
.853
648
.181
348
.359
10.
1778
49.2
125
3A0.
0000
49.2
125
48.9
737
...
48.1
813
48.0
797
0.10
1647
.322
73B
47.4
980
47.7
114
48.1
813
48.3
133
0.13
2149
.212
5
115⁄ 16
–20
or1.
9375
–20
UN
49.2
125
1.27
002A
0.03
8149
.174
448
.968
7..
.48
.348
948
.224
40.
1245
47.6
631
2B47
.828
248
.133
048
.387
048
.549
60.
1626
49.2
125
3A0.
0000
49.2
125
49.0
068
...
48.3
870
48.2
930
0.09
4047
.701
23B
47.8
282
48.0
339
48.3
870
48.5
089
0.12
1949
.212
5
2–4.
5or
2.00
00–
4.5
UN
C50
.800
05.
6444
1A0.
0737
50.7
263
49.8
881
...
47.0
611
46.6
979
0.36
3244
.005
51B
44.6
786
45.5
930
47.1
348
47.6
072
0.47
2450
.800
02A
0.07
3750
.726
350
.167
549
.888
147
.061
146
.819
80.
2413
44.0
055
2B44
.678
645
.593
047
.134
847
.449
70.
3150
50.8
000
3A0.
0000
50.8
000
50.2
412
...
47.1
348
46.9
544
0.18
0344
.079
23B
44.6
786
45.3
669
47.1
348
47.3
710
0.23
6250
.800
0
2–6
or2.
0000
–6
UN
50.8
000
4.23
332A
0.06
6050
.734
050
.271
7..
.47
.983
147
.764
70.
2184
45.6
921
2B46
.228
046
.990
048
.049
248
.331
10.
2819
50.8
000
3A0.
0000
50.8
000
50.3
377
...
48.0
492
47.8
866
0.16
2645
.758
13B
46.2
280
46.7
258
48.0
492
48.2
600
0.21
0850
.800
0
2–8
or2.
0000
–8
UN
50.8
000
3.17
502A
0.05
8450
.741
650
.360
650
.170
148
.679
148
.481
00.
1981
46.9
621
2B47
.371
048
.006
048
.737
548
.994
10.
2565
50.8
000
3A0.
0000
50.8
000
50.4
190
...
48.7
375
48.5
902
0.14
7347
.020
53B
47.3
710
47.7
444
48.7
375
48.9
306
0.19
3050
.800
0
2–12
or2.
0000
–12
UN
50.8
000
2.11
672A
0.04
5750
.754
350
.464
7..
.49
.380
149
.225
20.
1549
48.2
346
2B48
.514
048
.971
249
.425
949
.626
50.
2007
50.8
000
3A0.
0000
50.8
000
50.5
104
...
49.4
259
49.3
116
0.11
4348
.280
33B
48.5
140
48.7
629
49.4
259
49.5
757
0.14
9950
.800
0
2–16
or2.
0000
–16
UN
50.8
000
1.58
752A
0.04
0650
.759
450
.520
6..
.49
.728
149
.591
00.
1372
48.8
696
2B49
.072
849
.428
449
.768
849
.946
60.
1778
50.8
000
3A0.
0000
50.8
000
50.5
612
...
49.7
688
49.6
672
0.10
1648
.910
23B
49.0
728
49.2
989
49.7
688
49.9
008
0.13
2150
.800
0
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
114
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
2–20
or2.
0000
–20
UN
50.8
000
1.27
002A
0.03
8150
.761
950
.556
2..
.49
.936
449
.811
90.
1245
49.2
506
2B49
.428
449
.707
849
.974
550
.137
10.
1626
50.8
000
3A0.
0000
50.8
000
50.5
943
...
49.9
745
49.8
805
0.09
4049
.288
73B
49.4
284
49.6
214
49.9
745
50.0
964
0.12
1950
.800
0
21 ⁄ 8–
6or
2.12
50–
6U
N53
.975
04.
2333
2A0.
0660
53.9
090
53.4
467
...
51.1
581
50.9
372
0.22
1048
.867
12B
49.4
030
50.1
650
51.2
242
51.5
112
0.28
7053
.975
03A
0.00
0053
.975
053
.512
7..
.51
.224
251
.059
10.
1651
48.9
331
3B49
.403
049
.900
851
.224
251
.437
50.
2134
53.9
750
21 ⁄ 8–
8or
2.12
50–
8U
N53
.975
03.
1750
2A0.
0610
53.9
140
53.5
330
53.3
425
51.8
516
51.6
509
0.20
0750
.134
52B
50.5
460
51.1
810
51.9
125
52.1
716
0.25
9153
.975
03A
0.00
0053
.975
053
.594
0..
.51
.912
551
.762
70.
1499
50.1
955
3B50
.546
050
.919
451
.912
552
.108
10.
1956
53.9
750
21 ⁄ 8–
12or
2.12
50–
12U
N53
.975
02.
1167
2A0.
0457
53.9
293
53.6
397
...
52.5
551
52.4
002
0.15
4951
.409
62B
51.6
890
52.1
462
52.6
009
52.8
015
0.20
0753
.975
03A
0.00
0053
.975
053
.685
4..
.52
.600
952
.484
00.
1168
51.4
553
3B51
.689
051
.937
952
.600
952
.750
70.
1499
53.9
750
21 ⁄ 8–
16or
2.12
50–
16U
N53
.975
01.
5875
2A0.
0406
53.9
344
53.6
956
...
52.9
031
52.7
660
0.13
7252
.044
62B
52.2
478
52.6
034
52.9
438
53.1
216
0.17
7853
.975
03A
0.00
0053
.975
053
.736
2..
.52
.943
852
.839
60.
1041
52.0
852
3B52
.247
852
.473
952
.943
853
.078
40.
1346
53.9
750
21 ⁄ 8–
20or
2.12
50–
20U
N53
.975
01.
2700
2A0.
0381
53.9
369
53.7
312
...
53.1
114
52.9
844
0.12
7052
.425
62B
52.6
034
52.8
828
53.1
495
53.3
146
0.16
5153
.975
03A
0.00
0053
.975
053
.769
3..
.53
.149
553
.055
50.
0940
52.4
637
3B52
.603
452
.796
453
.149
553
.271
40.
1219
53.9
750
21 ⁄ 4–
4.5
or2.
2500
–4.
5U
NC
57.1
500
5.64
441A
0.07
3757
.076
356
.238
1..
.53
.411
153
.040
30.
3708
50.3
555
1B51
.028
651
.943
053
.484
853
.967
40.
4826
57.1
500
2A0.
0737
57.0
763
56.5
175
56.2
381
53.4
111
53.1
647
0.24
6450
.355
52B
51.0
286
51.9
430
53.4
848
53.8
048
0.32
0057
.150
03A
0.00
0057
.150
056
.591
2..
.53
.484
853
.299
40.
1854
50.4
292
3B51
.028
651
.716
953
.484
853
.726
10.
2413
57.1
500
21 ⁄ 4–
6or
2.25
00–
6U
N57
.150
04.
2333
2A0.
0660
57.0
840
56.6
217
...
54.3
331
54.1
096
0.22
3552
.042
12B
52.5
780
53.3
400
54.3
992
54.6
887
0.28
9657
.150
03A
0.00
0057
.150
056
.687
7..
.54
.399
254
.231
50.
1676
52.1
081
3B52
.578
053
.075
854
.399
254
.615
10.
2159
57.1
500
21 ⁄ 4–
8or
2.25
00–
8U
N57
.150
03.
1750
2A0.
0610
57.0
890
56.7
080
56.5
175
55.0
266
54.8
234
0.20
3253
.309
52B
53.7
210
54.3
560
55.0
875
55.3
517
0.26
4257
.150
03A
0.00
0057
.150
056
.769
0..
.55
.087
554
.935
10.
1524
53.3
705
3B53
.721
054
.094
455
.087
555
.285
60.
1981
57.1
500
21 ⁄ 4–
12or
2.25
00–
12U
N57
.150
02.
1167
2A0.
0457
57.1
043
56.8
147
...
55.7
301
55.5
752
0.15
4954
.584
62B
54.8
640
55.3
212
55.7
759
55.9
791
0.20
3257
.150
03A
0.00
0057
.150
056
.860
4..
.55
.775
955
.659
00.
1168
54.6
303
3B54
.864
055
.112
955
.775
955
.928
30.
1524
57.1
500
21 ⁄ 4–
16or
2.25
00–
16U
N57
.150
01.
5875
2A0.
0406
57.1
094
56.8
706
...
56.0
781
55.9
384
0.13
9755
.219
62B
55.4
228
55.7
784
56.1
188
56.2
991
0.18
0357
.150
03A
0.00
0057
.150
056
.911
2..
.56
.118
856
.014
60.
1041
55.2
602
3B55
.422
855
.648
956
.118
856
.253
40.
1346
57.1
500
21 ⁄ 4–
20or
2.25
00–
20U
N57
.150
01.
2700
2A0.
0381
57.1
119
56.9
062
...
56.2
864
56.1
594
0.12
7055
.600
62B
55.7
784
56.0
578
56.3
245
56.4
896
0.16
5157
.150
03A
0.00
0057
.150
056
.944
3..
.56
.324
556
.228
00.
0965
55.6
387
3B55
.778
455
.971
456
.324
556
.449
00.
1245
57.1
500
23 ⁄ 8–
6or
2.37
50–
6U
N60
.325
04.
2333
2A0.
0686
60.2
564
59.7
941
...
57.5
056
57.2
795
0.22
6155
.214
52B
55.7
530
56.5
150
57.5
742
57.8
663
0.29
2160
.325
03A
0.00
0060
.325
059
.862
7..
.57
.574
257
.406
50.
1676
55.2
831
3B55
.753
056
.250
857
.574
257
.792
60.
2184
60.3
250
ASME B1.1-2003 NONMANDATORY APPENDIX C
115
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
23 ⁄ 8–
8or
2.37
50–
8U
N60
.325
03.
1750
2A0.
0610
60.2
640
59.8
830
...
58.2
016
57.9
958
0.20
5756
.484
52B
56.8
960
57.5
310
58.2
625
58.5
292
0.26
6760
.325
03A
0.00
0060
.325
059
.944
0..
.58
.262
558
.110
10.
1524
56.5
455
3B56
.896
057
.269
458
.262
558
.463
20.
2007
60.3
250
23 ⁄ 8–
12or
2.37
50–
12U
N60
.325
02.
1167
2A0.
0457
60.2
793
59.9
897
...
58.9
051
58.7
477
0.15
7557
.759
62B
58.0
390
58.4
962
58.9
509
59.1
541
0.20
3260
.325
03A
0.00
0060
.325
060
.035
4..
.58
.950
958
.834
00.
1168
57.8
053
3B58
.039
058
.287
958
.950
959
.103
30.
1524
60.3
250
23 ⁄ 8–
16or
2.37
50–
16U
N60
.325
01.
5875
2A0.
0406
60.2
844
60.0
456
...
59.2
531
59.1
134
0.13
9758
.394
62B
58.5
978
58.9
534
59.2
938
59.4
741
0.18
0360
.325
03A
0.00
0060
.325
060
.086
2..
.59
.293
859
.189
60.
1041
58.4
352
3B58
.597
858
.823
959
.293
859
.430
90.
1372
60.3
250
23 ⁄ 8–
20or
2.37
50–
20U
N60
.325
01.
2700
2A0.
0381
60.2
869
60.0
812
...
59.4
614
59.3
344
0.12
7058
.775
62B
58.9
534
59.2
328
59.4
995
59.6
671
0.16
7660
.325
03A
0.00
0060
.325
060
.119
3..
.59
.499
559
.403
00.
0965
58.8
137
3B58
.953
459
.146
459
.499
559
.624
00.
1245
60.3
250
21 ⁄ 2–
4or
2.50
00–
4U
NC
63.5
000
6.35
001A
0.07
8763
.421
362
.514
5..
.59
.296
358
.902
60.
3937
55.8
597
1B56
.616
657
.581
859
.375
059
.888
10.
5131
63.5
000
2A0.
0787
63.4
213
62.8
167
62.5
145
59.2
963
59.0
321
0.26
4255
.859
72B
56.6
166
57.5
818
59.3
750
59.7
179
0.34
2963
.500
03A
0.00
0063
.500
062
.895
5..
.59
.375
059
.176
90.
1981
55.9
384
3B56
.616
657
.388
859
.375
059
.631
60.
2565
63.5
000
21 ⁄ 2–
6or
2.50
00–
6U
N63
.500
04.
2333
2A0.
0686
63.4
314
62.9
691
...
60.6
806
60.4
520
0.22
8658
.389
52B
58.9
280
59.6
900
60.7
492
61.0
438
0.29
4663
.500
03A
0.00
0063
.500
063
.037
7..
.60
.749
260
.579
00.
1702
58.4
581
3B58
.928
059
.425
860
.749
260
.970
20.
2210
63.5
000
21 ⁄ 2–
8or
2.50
00–
8U
N63
.500
03.
1750
2A0.
0610
63.4
390
63.0
580
62.8
675
61.3
766
61.1
683
0.20
8359
.659
52B
60.0
710
60.7
060
61.4
375
61.7
068
0.26
9263
.500
03A
0.00
0063
.500
063
.119
0..
.61
.437
561
.282
60.
1549
59.7
205
3B60
.071
060
.444
461
.437
561
.640
70.
2032
63.5
000
21 ⁄ 2–
12or
2.50
00–
12U
N63
.500
02.
1167
2A0.
0483
63.4
517
63.1
622
...
62.0
776
61.9
201
0.15
7560
.932
12B
61.2
140
61.6
712
62.1
259
62.3
316
0.20
5763
.500
03A
0.00
0063
.500
063
.210
4..
.62
.125
962
.009
00.
1168
60.9
803
3B61
.214
061
.462
962
.125
962
.278
30.
1524
63.5
000
21 ⁄ 2–
16or
2.50
00–
16U
N63
.500
01.
5875
2A0.
0432
63.4
568
63.2
181
...
62.4
256
62.2
859
0.13
9761
.567
12B
61.7
728
62.1
284
62.4
688
62.6
516
0.18
2963
.500
03A
0.00
0063
.500
063
.261
2..
.62
.468
862
.364
60.
1041
61.6
102
3B61
.772
861
.998
962
.468
862
.605
90.
1372
63.5
000
21 ⁄ 2–
20or
2.50
00–
20U
N63
.500
01.
2700
2A0.
0381
63.4
619
63.2
562
...
62.6
364
62.5
069
0.12
9561
.950
62B
62.1
284
62.4
078
62.6
745
62.8
421
0.16
7663
.500
03A
0.00
0063
.500
063
.294
3..
.62
.674
562
.578
00.
0965
61.9
887
3B62
.128
462
.321
462
.674
562
.801
50.
1270
63.5
000
25 ⁄ 8–
6or
2.62
50–
6U
N66
.675
04.
2333
2A0.
0686
66.6
064
66.1
441
...
63.8
556
63.6
270
0.22
8661
.564
52B
62.1
030
62.8
650
63.9
242
64.2
239
0.29
9766
.675
03A
0.00
0066
.675
066
.212
7..
.63
.924
263
.751
50.
1727
61.6
331
3B62
.103
062
.600
863
.924
264
.147
70.
2235
66.6
750
25 ⁄ 8–
8or
2.62
50–
8U
N66
.675
03.
1750
2A0.
0635
66.6
115
66.2
305
...
64.5
490
64.3
407
0.20
8362
.832
02B
63.2
460
63.8
810
64.6
125
64.8
843
0.27
1866
.675
03A
0.00
0066
.675
066
.294
0..
.64
.612
564
.455
00.
1575
62.8
955
3B63
.246
063
.619
464
.612
564
.815
70.
2032
66.6
750
25 ⁄ 8–
12or
2.62
50–
12U
N66
.675
02.
1167
2A0.
0483
66.6
267
66.3
372
...
65.2
526
65.0
951
0.15
7564
.107
12B
64.3
890
64.8
462
65.3
009
65.5
066
0.20
5766
.675
03A
0.00
0066
.675
066
.385
4..
.65
.300
965
.181
50.
1194
64.1
553
3B64
.389
064
.637
965
.300
965
.455
80.
1549
66.6
750
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
116
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
25 ⁄ 8–
16or
2.62
50–
16U
N66
.675
01.
5875
2A0.
0432
66.6
318
66.3
931
...
65.6
006
65.4
583
0.14
2264
.742
12B
64.9
478
65.3
034
65.6
438
65.8
266
0.18
2966
.675
03A
0.00
0066
.675
066
.436
2..
.65
.643
865
.537
10.
1067
64.7
852
3B64
.947
865
.173
965
.643
865
.780
90.
1372
66.6
750
25 ⁄ 8–
20or
2.62
50–
20U
N66
.675
01.
2700
2A0.
0381
66.6
369
66.4
312
...
65.8
114
65.6
819
0.12
9565
.125
62B
65.3
034
65.5
828
65.8
495
66.0
171
0.16
7666
.675
03A
0.00
0066
.675
066
.469
3..
.65
.849
565
.753
00.
0965
65.1
637
3B65
.303
465
.496
465
.849
565
.976
50.
1270
66.6
750
23 ⁄ 4–
4or
2.75
00–
4U
NC
69.8
500
6.35
001A
0.08
1369
.768
768
.861
9..
.65
.643
865
.242
40.
4013
62.2
071
1B62
.966
663
.931
865
.725
066
.248
30.
5232
69.8
500
2A0.
0813
69.7
687
69.1
642
68.8
619
65.6
438
65.3
771
0.26
6762
.207
12B
62.9
666
63.9
318
65.7
250
66.0
730
0.34
8069
.850
03A
0.00
0069
.850
069
.245
5..
.65
.725
065
.524
40.
2007
62.2
884
3B62
.966
663
.738
865
.725
065
.986
70.
2616
69.8
500
23 ⁄ 4–
6or
2.75
00–
6U
N69
.850
04.
2333
2A0.
0686
69.7
814
69.3
191
...
67.0
306
66.7
995
0.23
1164
.739
52B
65.2
780
66.0
400
67.0
992
67.4
014
0.30
2369
.850
03A
0.00
0069
.850
069
.387
7..
.67
.099
266
.926
50.
1727
64.8
081
3B65
.278
065
.775
867
.099
267
.325
20.
2261
69.8
500
23 ⁄ 4–
8or
2.75
00–
8U
N69
.850
03.
1750
2A0.
0635
69.7
865
69.4
055
69.2
150
67.7
240
67.5
132
0.21
0866
.007
02B
66.4
210
67.0
560
67.7
875
68.0
618
0.27
4369
.850
03A
0.00
0069
.850
069
.469
0..
.67
.787
567
.627
50.
1600
66.0
705
3B66
.421
066
.794
467
.787
567
.993
30.
2057
69.8
500
23 ⁄ 4–
12or
2.75
00–
12U
N69
.850
02.
1167
2A0.
0483
69.8
017
69.5
122
...
68.4
276
68.2
676
0.16
0067
.282
12B
67.5
640
68.0
212
68.4
759
68.6
816
0.20
5769
.850
03A
0.00
0069
.850
069
.560
4..
.68
.475
968
.356
50.
1194
67.3
303
3B67
.564
067
.812
968
.475
968
.630
80.
1549
69.8
500
23 ⁄ 4–
16or
2.75
00–
16U
N69
.850
01.
5875
2A0.
0432
69.8
068
69.5
681
...
68.7
756
68.6
333
0.14
2267
.917
12B
68.1
228
68.4
784
68.8
188
69.0
042
0.18
5469
.850
03A
0.00
0069
.850
069
.611
2..
.68
.818
868
.712
10.
1067
67.9
602
3B68
.122
868
.348
968
.818
868
.955
90.
1372
69.8
500
23 ⁄ 4–
20or
2.75
00–
20U
N69
.850
01.
2700
2A0.
0381
69.8
119
69.6
062
...
68.9
864
68.8
569
0.12
9568
.300
62B
68.4
784
68.7
578
69.0
245
69.1
947
0.17
0269
.850
03A
0.00
0069
.850
069
.644
3..
.69
.024
568
.925
40.
0991
68.3
387
3B68
.478
468
.671
469
.024
569
.151
50.
1270
69.8
500
27 ⁄ 8–
6or
2.87
50–
6U
N73
.025
04.
2333
2A0.
0711
72.9
539
72.4
916
...
70.2
031
69.9
694
0.23
3767
.912
02B
68.4
530
69.2
150
70.2
742
70.5
790
0.30
4873
.025
03A
0.00
0073
.025
072
.562
7..
.70
.274
270
.098
90.
1753
67.9
831
3B68
.453
068
.950
870
.274
270
.502
80.
2286
73.0
250
27 ⁄ 8–
8or
2.87
50–
8U
N73
.025
03.
1750
2A0.
0635
72.9
615
72.5
805
...
70.8
990
70.6
857
0.21
3469
.182
02B
69.5
960
70.2
310
70.9
625
71.2
419
0.27
9473
.025
03A
0.00
0073
.025
072
.644
0..
.70
.962
570
.802
50.
1600
69.2
455
3B69
.596
069
.969
470
.962
571
.170
80.
2083
73.0
250
27 ⁄ 8–
12or
2.87
50–
12U
N73
.025
02.
1167
2A0.
0483
72.9
767
72.6
872
...
71.6
026
71.4
426
0.16
0070
.457
12B
70.7
390
71.1
962
71.6
509
71.8
591
0.20
8373
.025
03A
0.00
0073
.025
072
.735
4..
.71
.650
971
.531
50.
1194
70.5
053
3B70
.739
070
.987
971
.650
971
.805
80.
1549
73.0
250
27 ⁄ 8–
16or
2.87
50–
16U
N73
.025
01.
5875
2A0.
0432
72.9
818
72.7
431
...
71.9
506
71.8
083
0.14
2271
.092
12B
71.2
978
71.6
534
71.9
938
72.1
792
0.18
5473
.025
03A
0.00
0073
.025
072
.786
2..
.71
.993
871
.887
10.
1067
71.1
352
3B71
.297
871
.523
971
.993
872
.133
50.
1397
73.0
250
27 ⁄ 8–
20or
2.87
50–
20U
N73
.025
01.
2700
2A0.
0406
72.9
844
72.7
786
...
72.1
589
72.0
268
0.13
2171
.473
12B
71.6
534
71.9
328
72.1
995
72.3
697
0.17
0273
.025
03A
0.00
0073
.025
072
.819
3..
.72
.199
572
.100
40.
0991
71.5
137
3B71
.653
471
.846
472
.199
572
.326
50.
1270
73.0
250
ASME B1.1-2003 NONMANDATORY APPENDIX C
117
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
3–4
or3.
0000
–4
UN
C76
.200
06.
3500
1A0.
0813
76.1
187
75.2
119
...
71.9
938
71.5
848
0.40
8968
.557
11B
69.3
166
70.2
818
72.0
750
72.6
059
0.53
0976
.200
02A
0.08
1376
.118
775
.514
275
.211
971
.993
871
.722
00.
2718
68.5
571
2B69
.316
670
.281
872
.075
072
.428
10.
3531
76.2
000
3A0.
0000
76.2
000
75.5
955
...
72.0
750
71.8
718
0.20
3268
.638
43B
69.3
166
70.0
888
72.0
750
72.3
392
0.26
4276
.200
0
3–6
or3.
0000
–6
UN
76.2
000
4.23
332A
0.07
1176
.128
975
.666
6..
.73
.378
173
.141
80.
2362
71.0
870
2B71
.628
072
.390
073
.449
273
.756
50.
3073
76.2
000
3A0.
0000
76.2
000
75.7
377
...
73.4
492
73.2
714
0.17
7871
.158
13B
71.6
280
72.1
258
73.4
492
73.6
803
0.23
1176
.200
0
3–8
or3.
0000
–8
UN
76.2
000
3.17
502A
0.06
6076
.134
075
.753
075
.562
574
.071
573
.855
60.
2159
72.3
544
2B72
.771
073
.406
074
.137
574
.419
50.
2819
76.2
000
3A0.
0000
76.2
000
75.8
190
...
74.1
375
73.9
750
0.16
2672
.420
53B
72.7
710
73.1
444
74.1
375
74.3
483
0.21
0876
.200
0
3–12
or3.
0000
–12
UN
76.2
000
2.11
672A
0.04
8376
.151
775
.862
2..
.74
.777
674
.617
60.
1600
73.6
321
2B73
.914
074
.371
274
.825
975
.034
10.
2083
76.2
000
3A0.
0000
76.2
000
75.9
104
...
74.8
259
74.7
065
0.11
9473
.680
33B
73.9
140
74.1
629
74.8
259
74.9
833
0.15
7576
.200
0
3–16
or3.
0000
–16
UN
76.2
000
1.58
752A
0.04
3276
.156
875
.918
1..
.75
.125
674
.980
80.
1448
74.2
671
2B74
.472
874
.828
475
.168
875
.354
20.
1854
76.2
000
3A0.
0000
76.2
000
75.9
612
...
75.1
688
75.0
621
0.10
6774
.310
23B
74.4
728
74.6
989
75.1
688
75.3
085
0.13
9776
.200
0
3–20
or3.
0000
–20
UN
76.2
000
1.27
002A
0.04
0676
.159
475
.953
6..
.75
.333
975
.201
80.
1321
74.6
481
2B74
.828
475
.107
875
.374
575
.547
20.
1727
76.2
000
3A0.
0000
76.2
000
75.9
943
...
75.3
745
75.2
754
0.09
9174
.688
73B
74.8
284
75.0
214
75.3
745
75.5
040
0.12
9576
.200
0
31 ⁄ 8–
6or
3.12
50–
6U
N79
.375
04.
2333
2A0.
0711
79.3
039
78.8
416
...
76.5
531
76.3
143
0.23
8874
.262
02B
74.8
030
75.5
650
76.6
242
76.9
341
0.30
9979
.375
03A
0.00
0079
.375
078
.912
7..
.76
.624
276
.446
40.
1778
74.3
331
3B74
.803
075
.300
876
.624
276
.857
90.
2337
79.3
750
31 ⁄ 8–
8or
3.12
50–
8U
N79
.375
03.
1750
2A0.
0660
79.3
090
78.9
280
...
77.2
465
77.0
280
0.21
8475
.529
42B
75.9
460
76.5
810
77.3
125
77.5
970
0.28
4579
.375
03A
0.00
0079
.375
078
.994
0..
.77
.312
577
.150
00.
1626
75.5
955
3B75
.946
076
.319
477
.312
577
.525
90.
2134
79.3
750
31 ⁄ 8–
12or
3.12
50–
12U
N79
.375
02.
1167
2A0.
0483
79.3
267
79.0
372
...
77.9
526
77.7
900
0.16
2676
.807
12B
77.0
890
77.5
462
78.0
009
78.2
117
0.21
0879
.375
03A
0.00
0079
.375
079
.085
4..
.78
.000
977
.878
90.
1219
76.8
553
3B77
.089
077
.337
978
.000
978
.158
30.
1575
79.3
750
31 ⁄ 8–
16or
3.12
50–
16U
N79
.375
01.
5875
2A0.
0432
79.3
318
79.0
931
...
78.3
006
78.1
558
0.14
4877
.442
12B
77.6
478
78.0
034
78.3
438
78.5
317
0.18
8079
.375
03A
0.00
0079
.375
079
.136
2..
.78
.343
878
.234
50.
1092
77.4
852
3B77
.647
877
.873
978
.343
878
.483
50.
1397
79.3
750
31 ⁄ 4–
4or
3.25
00–
4U
NC
82.5
500
6.35
001A
0.08
3882
.466
281
.559
4..
.78
.341
277
.927
20.
4140
74.9
046
1B75
.666
676
.631
878
.425
078
.963
50.
5385
82.5
500
2A0.
0838
82.4
662
81.8
617
81.5
594
78.3
412
78.0
644
0.27
6974
.904
62B
75.6
666
76.6
318
78.4
250
78.7
832
0.35
8182
.550
03A
0.00
0082
.550
081
.945
5..
.78
.425
078
.216
80.
2083
74.9
884
3B75
.666
676
.438
878
.425
078
.694
30.
2692
82.5
500
31 ⁄ 4–
6or
3.25
00–
6U
N82
.550
04.
2333
2A0.
0711
82.4
789
82.0
166
...
79.7
281
79.4
868
0.24
1377
.437
02B
77.9
780
78.7
400
79.7
992
80.1
116
0.31
2482
.550
03A
0.00
0082
.550
082
.087
7..
.79
.799
279
.618
80.
1803
77.5
081
3B77
.978
078
.475
879
.799
280
.032
90.
2337
82.5
500
31 ⁄ 4–
8or
3.25
00–
8U
N82
.550
03.
1750
2A0.
0660
82.4
840
82.1
030
81.9
125
80.4
215
80.2
005
0.22
1078
.704
42B
79.1
210
79.7
560
80.4
875
80.7
745
0.28
7082
.550
03A
0.00
0082
.550
082
.169
0..
.80
.487
580
.322
40.
1651
78.7
705
3B79
.121
079
.494
480
.487
580
.703
40.
2159
82.5
500
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
118
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
31 ⁄ 4–
12or
3.25
00–
12U
N82
.550
02.
1167
2A0.
0483
82.5
017
82.2
122
...
81.1
276
80.9
650
0.16
2679
.982
12B
80.2
640
80.7
212
81.1
759
81.3
867
0.21
0882
.550
03A
0.00
0082
.550
082
.260
4..
.81
.175
981
.053
90.
1219
80.0
303
3B80
.264
080
.512
981
.175
981
.333
30.
1575
82.5
500
31 ⁄ 4–
16or
3.25
00–
16U
N82
.550
01.
5875
2A0.
0432
82.5
068
82.2
681
...
81.4
756
81.3
308
0.14
4880
.617
12B
80.8
228
81.1
784
81.5
188
81.7
067
0.18
8082
.550
03A
0.00
0082
.550
082
.311
2..
.81
.518
881
.409
50.
1092
80.6
602
3B80
.822
881
.048
981
.518
881
.661
00.
1422
82.5
500
33 ⁄ 8–
6or
3.37
50–
6U
N85
.725
04.
2333
2A0.
0737
85.6
513
85.1
891
...
82.9
005
82.6
592
0.24
1380
.609
42B
81.1
530
81.9
150
82.9
742
83.2
891
0.31
5085
.725
03A
0.00
0085
.725
085
.262
7..
.82
.974
282
.791
30.
1829
80.6
831
3B81
.153
081
.650
882
.974
283
.210
40.
2362
85.7
250
33 ⁄ 8–
8or
3.37
50–
8U
N85
.725
03.
1750
2A0.
0660
85.6
590
85.2
780
...
83.5
965
83.3
730
0.22
3581
.879
42B
82.2
960
82.9
310
83.6
625
83.9
521
0.28
9685
.725
03A
0.00
0085
.725
085
.344
0..
.83
.662
583
.494
90.
1676
81.9
455
3B82
.296
082
.669
483
.662
583
.878
40.
2159
85.7
250
33 ⁄ 8–
12or
3.37
50–
12U
N85
.725
02.
1167
2A0.
0483
85.6
767
85.3
872
...
84.3
026
84.1
400
0.16
2683
.157
12B
83.4
390
83.8
962
84.3
509
84.5
617
0.21
0885
.725
03A
0.00
0085
.725
085
.435
4..
.84
.350
984
.228
90.
1219
83.2
053
3B83
.439
083
.687
984
.350
984
.510
90.
1600
85.7
250
33 ⁄ 8–
16or
3.37
50–
16U
N85
.725
01.
5875
2A0.
0432
85.6
818
85.4
431
...
84.6
506
84.5
058
0.14
4883
.792
12B
83.9
978
84.3
534
84.6
938
84.8
843
0.19
0585
.725
03A
0.00
0085
.725
085
.486
2..
.84
.693
884
.584
50.
1092
83.8
352
3B83
.997
884
.223
984
.693
884
.836
00.
1422
85.7
250
31 ⁄ 2–
4or
3.50
00–
4U
NC
88.9
000
6.35
001A
0.08
3888
.816
287
.909
4..
.84
.691
284
.269
60.
4216
81.2
546
1B82
.016
682
.981
884
.775
085
.321
10.
5461
88.9
000
2A0.
0838
88.8
162
88.2
117
87.9
094
84.6
912
84.4
118
0.27
9481
.254
62B
82.0
166
82.9
818
84.7
750
85.1
383
0.36
3288
.900
03A
0.00
0088
.900
088
.295
5..
.84
.775
084
.564
20.
2108
81.3
384
3B82
.016
682
.788
884
.775
085
.049
40.
2743
88.9
000
31 ⁄ 2–
6or
3.50
00–
6U
N88
.900
04.
2333
2A0.
0737
88.8
263
88.3
641
...
86.0
755
85.8
317
0.24
3883
.784
42B
84.3
280
85.0
900
86.1
492
86.4
667
0.31
7588
.900
03A
0.00
0088
.900
088
.437
7..
.86
.149
285
.966
30.
1829
83.8
581
3B84
.328
084
.825
886
.149
286
.387
90.
2388
88.9
000
31 ⁄ 2–
8or
3.50
00–
8U
N88
.900
03.
1750
2A0.
0660
88.8
340
88.4
530
88.2
625
86.7
715
86.5
480
0.22
3585
.054
42B
85.4
710
86.1
060
86.8
375
87.1
296
0.29
2188
.900
03A
0.00
0088
.900
088
.519
0..
.86
.837
586
.669
90.
1676
85.1
205
3B85
.471
085
.844
486
.837
587
.056
00.
2184
88.9
000
31 ⁄ 2–
12or
3.50
00–
12U
N88
.900
02.
1167
2A0.
0483
88.8
517
88.5
622
...
87.4
776
87.3
150
0.16
2686
.332
12B
86.6
140
87.0
712
87.5
259
87.7
392
0.21
3488
.900
03A
0.00
0088
.900
088
.610
4..
.87
.525
987
.403
90.
1219
86.3
803
3B86
.614
086
.862
987
.525
987
.685
90.
1600
88.9
000
31 ⁄ 2–
16or
3.50
00–
16U
N88
.900
01.
5875
2A0.
0432
88.8
568
88.6
181
...
87.8
256
87.6
783
0.14
7386
.967
12B
87.1
728
87.5
284
87.8
688
88.0
593
0.19
0588
.900
03A
0.00
0088
.900
088
.661
2..
.87
.868
887
.759
50.
1092
87.0
102
3B87
.172
887
.398
987
.868
888
.011
00.
1422
88.9
000
35 ⁄ 8–
6or
3.62
50–
6U
N92
.075
04.
2333
2A0.
0737
92.0
013
91.5
391
...
89.2
505
89.0
041
0.24
6486
.959
42B
87.5
030
88.2
650
89.3
242
89.6
442
0.32
0092
.075
03A
0.00
0092
.075
091
.612
7..
.89
.324
289
.138
80.
1854
87.0
331
3B87
.503
088
.000
889
.324
289
.565
50.
2413
92.0
750
35 ⁄ 8–
8or
3.62
50–
8U
N92
.075
03.
1750
2A0.
0686
92.0
064
91.6
254
...
89.9
439
89.7
179
0.22
6188
.226
92B
88.6
460
89.2
810
90.0
125
90.3
072
0.29
4692
.075
03A
0.00
0092
.075
091
.694
0..
.90
.012
589
.842
30.
1702
88.2
955
3B88
.646
089
.019
490
.012
590
.233
50.
2210
92.0
750
ASME B1.1-2003 NONMANDATORY APPENDIX C
119
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
35 ⁄ 8–
12or
3.62
50–
12U
N92
.075
02.
1167
2A0.
0483
92.0
267
91.7
372
...
90.6
526
90.4
875
0.16
5189
.507
12B
89.7
890
90.2
462
90.7
009
90.9
142
0.21
3492
.075
03A
0.00
0092
.075
091
.785
4..
.90
.700
990
.578
90.
1219
89.5
553
3B89
.789
090
.037
990
.700
990
.860
90.
1600
92.0
750
35 ⁄ 8–
16or
3.62
50–
16U
N92
.075
01.
5875
2A0.
0432
92.0
318
91.7
931
...
91.0
006
90.8
533
0.14
7390
.142
12B
90.3
478
90.7
034
91.0
438
91.2
343
0.19
0592
.075
03A
0.00
0092
.075
091
.836
2..
.91
.043
890
.934
50.
1092
90.1
852
3B90
.347
890
.573
991
.043
891
.186
00.
1422
92.0
750
33 ⁄ 4–
4or
3.75
00–
4U
NC
95.2
500
6.35
001A
0.08
6495
.163
694
.256
9..
.91
.038
790
.612
00.
4267
87.6
021
1B88
.366
689
.331
891
.125
091
.678
80.
5537
95.2
500
2A0.
0864
95.1
636
94.5
591
94.2
569
91.0
387
90.7
542
0.28
4587
.602
12B
88.3
666
89.3
318
91.1
250
91.4
933
0.36
8395
.250
03A
0.00
0095
.250
094
.645
5..
.91
.125
090
.911
70.
2134
87.6
884
3B88
.366
689
.138
891
.125
091
.401
90.
2769
95.2
500
33 ⁄ 4–
6or
3.75
00–
6U
N95
.250
04.
2333
2A0.
0737
95.1
763
94.7
141
...
92.4
255
92.1
766
0.24
8990
.134
42B
90.6
780
91.4
400
92.4
992
92.8
218
0.32
2695
.250
03A
0.00
0095
.250
094
.787
7..
.92
.499
292
.313
80.
1854
90.2
081
3B90
.678
091
.175
892
.499
292
.740
50.
2413
95.2
500
33 ⁄ 4–
8or
3.75
00–
8U
N95
.250
03.
1750
2A0.
0686
95.1
814
94.8
004
94.6
099
93.1
189
92.8
903
0.22
8691
.401
92B
91.8
210
92.4
560
93.1
875
93.4
847
0.29
7295
.250
03A
0.00
0095
.250
094
.869
0..
.93
.187
593
.017
30.
1702
91.4
705
3B91
.821
092
.194
493
.187
593
.411
00.
2235
95.2
500
33 ⁄ 4–
12or
3.75
00–
12U
N95
.250
02.
1167
2A0.
0483
95.2
017
94.9
122
...
93.8
276
93.6
625
0.16
5192
.682
12B
92.9
640
93.4
212
93.8
759
94.0
892
0.21
3495
.250
03A
0.00
0095
.250
094
.960
4..
.93
.875
993
.751
40.
1245
92.7
303
3B92
.964
093
.212
993
.875
994
.035
90.
1600
95.2
500
33 ⁄ 4–
16or
3.75
00–
16U
N95
.250
01.
5875
2A0.
0432
95.2
068
94.9
681
...
94.1
756
94.0
283
0.14
7393
.317
12B
93.5
228
93.8
784
94.2
188
94.4
118
0.19
3095
.250
03A
0.00
0095
.250
095
.011
2..
.94
.218
894
.107
00.
1118
93.3
602
3B93
.522
893
.748
994
.218
894
.363
50.
1448
95.2
500
37 ⁄ 8–
6or
3.87
50–
6U
N98
.425
04.
2333
2A0.
0762
98.3
488
97.8
865
...
95.5
980
95.3
465
0.25
1593
.306
92B
93.8
530
94.6
150
95.6
742
95.9
993
0.32
5198
.425
03A
0.00
0098
.425
097
.962
7..
.95
.674
295
.486
20.
1880
93.3
831
3B93
.853
094
.350
895
.674
295
.918
00.
2438
98.4
250
37 ⁄ 8–
8or
3.87
50–
8U
N98
.425
03.
1750
2A0.
0686
98.3
564
97.9
754
...
96.2
939
96.0
628
0.23
1194
.576
92B
94.9
960
95.6
310
96.3
625
96.6
622
0.29
9798
.425
03A
0.00
0098
.425
098
.044
0..
.96
.362
596
.189
80.
1727
94.6
455
3B94
.996
095
.369
496
.362
596
.586
00.
2235
98.4
250
37 ⁄ 8–
12or
3.87
50–
12U
N98
.425
02.
1167
2A0.
0508
98.3
742
98.0
846
...
97.0
001
96.8
350
0.16
5195
.854
52B
96.1
390
96.5
962
97.0
509
97.2
668
0.21
5998
.425
03A
0.00
0098
.425
098
.135
4..
.97
.050
996
.926
40.
1245
95.9
053
3B96
.139
096
.387
997
.050
997
.213
40.
1626
98.4
250
37 ⁄ 8–
16or
3.87
50–
16U
N98
.425
01.
5875
2A0.
0457
98.3
793
98.1
405
...
97.3
480
97.2
007
0.14
7396
.489
52B
96.6
978
97.0
534
97.3
938
97.5
868
0.19
3098
.425
03A
0.00
0098
.425
098
.186
2..
.97
.393
897
.282
00.
1118
96.5
352
3B96
.697
896
.923
997
.393
897
.538
50.
1448
98.4
250
4–4
or4.
0000
–4
UN
C10
1.60
006.
3500
1A0.
0864
101.
5136
100.
6069
...
97.3
887
96.9
569
0.43
1893
.952
11B
94.7
166
95.6
818
97.4
750
98.0
364
0.56
1310
1.60
002A
0.08
6410
1.51
3610
0.90
9110
0.60
6997
.388
797
.101
70.
2870
93.9
521
2B94
.716
695
.681
897
.475
097
.848
40.
3734
101.
6000
3A0.
0000
101.
6000
100.
9955
...
97.4
750
97.2
591
0.21
5994
.038
43B
94.7
166
95.4
888
97.4
750
97.7
570
0.28
1910
1.60
00
4–6
or4.
0000
–6
UN
101.
6000
4.23
332A
0.07
6210
1.52
3810
1.06
15..
.98
.773
098
.521
50.
2515
96.4
819
2B97
.028
097
.790
098
.849
299
.176
80.
3277
101.
6000
3A0.
0000
101.
6000
101.
1377
...
98.8
492
98.6
612
0.18
8096
.558
13B
97.0
280
97.5
258
98.8
492
99.0
956
0.24
6410
1.60
00
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
120
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
4–8
or4.
0000
–8
UN
101.
6000
3.17
502A
0.06
8610
1.53
1410
1.15
0410
0.95
9999
.468
999
.237
80.
2311
97.7
519
2B98
.171
098
.806
099
.537
599
.839
80.
3023
101.
6000
3A0.
0000
101.
6000
101.
2190
...
99.5
375
99.3
648
0.17
2797
.820
53B
98.1
710
98.5
444
99.5
375
99.7
636
0.22
6110
1.60
00
4–12
or4.
0000
–12
UN
101.
6000
2.11
672A
0.05
0810
1.54
9210
1.25
96..
.10
0.17
5110
0.01
000.
1651
99.0
295
2B99
.314
099
.771
210
0.22
5910
0.44
180.
2159
101.
6000
3A0.
0000
101.
6000
101.
3104
...
100.
2259
100.
1014
0.12
4599
.080
33B
99.3
140
99.5
629
100.
2259
100.
3884
0.16
2610
1.60
00
4–16
or4.
0000
–16
UN
101.
6000
1.58
752A
0.04
5710
1.55
4310
1.31
55..
.10
0.52
3010
0.37
320.
1499
99.6
645
2B99
.872
810
0.22
8410
0.56
8810
0.76
180.
1930
101.
6000
3A0.
0000
101.
6000
101.
3612
...
100.
5688
100.
4570
0.11
1899
.710
23B
99.8
728
100.
0989
100.
5688
100.
7135
0.14
4810
1.60
00
41 ⁄ 8–
6or
4.12
50–
6U
N10
4.77
504.
2333
2A0.
0762
104.
6988
104.
2365
...
101.
9480
101.
6940
0.25
4099
.656
92B
100.
2030
100.
9650
102.
0242
102.
3544
0.33
0210
4.77
503A
0.00
0010
4.77
5010
4.31
27..
.10
2.02
4210
1.83
370.
1905
99.7
331
3B10
0.20
3010
0.70
0810
2.02
4210
2.27
060.
2464
104.
7750
41 ⁄ 8–
8or
4.12
50–
8U
N10
4.77
503.
1750
2A0.
0711
104.
7039
104.
3229
...
102.
6414
102.
4077
0.23
3710
0.92
442B
101.
3460
101.
9810
102.
7125
103.
0173
0.30
4810
4.77
503A
0.00
0010
4.77
5010
4.39
40..
.10
2.71
2510
2.53
730.
1753
100.
9955
3B10
1.34
6010
1.71
9410
2.71
2510
2.94
110.
2286
104.
7750
41 ⁄ 8–
12or
4.12
50–
12U
N10
4.77
502.
1167
2A0.
0508
104.
7242
104.
4346
...
103.
3501
103.
1824
0.16
7610
2.20
452B
102.
4890
102.
9462
103.
4009
103.
6168
0.21
5910
4.77
503A
0.00
0010
4.77
5010
4.48
54..
.10
3.40
0910
3.27
640.
1245
102.
2553
3B10
2.48
9010
2.73
7910
3.40
0910
3.56
340.
1626
104.
7750
41 ⁄ 8–
16or
4.12
50–
16U
N10
4.77
501.
5875
2A0.
0457
104.
7293
104.
4905
...
103.
6980
103.
5482
0.14
9910
2.83
952B
103.
0478
103.
4034
103.
7438
103.
9393
0.19
5610
4.77
503A
0.00
0010
4.77
5010
4.53
62..
.10
3.74
3810
3.63
200.
1118
102.
8852
3B10
3.04
7810
3.27
3910
3.74
3810
3.88
850.
1448
104.
7750
41 ⁄ 4–
4or
4.25
00–
4U
N10
7.95
006.
3500
2A0.
0864
107.
8636
107.
2591
...
103.
7387
103.
4466
0.29
2110
0.30
212B
101.
0666
102.
0318
103.
8250
104.
2035
0.37
8510
7.95
003A
0.00
0010
7.95
0010
7.34
55..
.10
3.82
5010
3.60
660.
2184
100.
3884
3B10
1.06
6610
1.83
8810
3.82
5010
4.10
950.
2845
107.
9500
41 ⁄ 4–
6or
4.25
00–
6U
N10
7.95
004.
2333
2A0.
0762
107.
8738
107.
4115
...
105.
1230
104.
8664
0.25
6510
2.83
192B
103.
3780
104.
1400
105.
1992
105.
5319
0.33
2710
7.95
003A
0.00
0010
7.95
0010
7.48
77..
.10
5.19
9210
5.00
870.
1905
102.
9081
3B10
3.37
8010
3.87
5810
5.19
9210
5.44
810.
2489
107.
9500
41 ⁄ 4–
8or
4.25
00–
8U
N10
7.95
003.
1750
2A0.
0711
107.
8789
107.
4979
...
105.
8164
105.
5802
0.23
6210
4.09
942B
104.
5210
105.
1560
105.
8875
106.
1949
0.30
7310
7.95
003A
0.00
0010
7.95
0010
7.56
90..
.10
5.88
7510
5.70
970.
1778
104.
1705
3B10
4.52
1010
4.89
4410
5.88
7510
6.11
610.
2286
107.
9500
41 ⁄ 4–
12or
4.25
00–
12U
N10
7.95
002.
1167
2A0.
0508
107.
8992
107.
6096
...
106.
5251
106.
3574
0.16
7610
5.37
952B
105.
6640
106.
1212
106.
5759
106.
7943
0.21
8410
7.95
003A
0.00
0010
7.95
0010
7.66
04..
.10
6.57
5910
6.45
140.
1245
105.
4303
3B10
5.66
4010
5.91
2910
6.57
5910
6.73
840.
1626
107.
9500
41 ⁄ 4–
16or
4.25
00–
16U
N10
7.95
001.
5875
2A0.
0457
107.
9043
107.
6655
...
106.
8730
106.
7232
0.14
9910
6.01
452B
106.
2228
106.
5784
106.
9188
107.
1143
0.19
5610
7.95
003A
0.00
0010
7.95
0010
7.71
12..
.10
6.91
8810
6.80
700.
1118
106.
0602
3B10
6.22
2810
6.44
8910
6.91
8810
7.06
610.
1473
107.
9500
43 ⁄ 8–
6or
4.37
50–
6U
N11
1.12
504.
2333
2A0.
0762
111.
0488
110.
5865
...
108.
2980
108.
0414
0.25
6510
6.00
692B
106.
5530
107.
3150
108.
3742
108.
7095
0.33
5311
1.12
503A
0.00
0011
1.12
5011
0.66
27..
.10
8.37
4210
8.18
110.
1930
106.
0831
3B10
6.55
3010
7.05
0810
8.37
4210
8.62
560.
2515
111.
1250
43 ⁄ 8–
8or
4.37
50–
8U
N11
1.12
503.
1750
2A0.
0711
111.
0539
110.
6729
...
108.
9914
108.
7552
0.23
6210
7.27
442B
107.
6960
108.
3310
109.
0625
109.
3699
0.30
7311
1.12
503A
0.00
0011
1.12
5011
0.74
40..
.10
9.06
2510
8.88
470.
1778
107.
3455
3B10
7.69
6010
8.06
9410
9.06
2510
9.29
370.
2311
111.
1250
ASME B1.1-2003 NONMANDATORY APPENDIX C
121
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
43 ⁄ 8–
12or
4.37
50–
12U
N11
1.12
502.
1167
2A0.
0508
111.
0742
110.
7846
...
109.
7001
109.
5324
0.16
7610
8.55
452B
108.
8390
109.
2962
109.
7509
109.
9693
0.21
8411
1.12
503A
0.00
0011
1.12
5011
0.83
54..
.10
9.75
0910
9.62
390.
1270
108.
6053
3B10
8.83
9010
9.08
7910
9.75
0910
9.91
340.
1626
111.
1250
43 ⁄ 8–
16or
4.37
50–
16U
N11
1.12
501.
5875
2A0.
0457
111.
0793
110.
8405
...
110.
0480
109.
8982
0.14
9910
9.18
952B
109.
3978
109.
7534
110.
0938
110.
2893
0.19
5611
1.12
503A
0.00
0011
1.12
5011
0.88
62..
.11
0.09
3810
9.97
950.
1143
109.
2352
3B10
9.39
7810
9.62
3911
0.09
3811
0.24
110.
1473
111.
1250
41 ⁄ 2–
4or
4.50
00–
4U
N11
4.30
006.
3500
2A0.
0889
114.
2111
113.
6066
...
110.
0861
109.
7915
0.29
4610
6.64
952B
107.
4166
108.
3818
110.
1750
110.
5586
0.38
3511
4.30
003A
0.00
0011
4.30
0011
3.69
55..
.11
0.17
5010
9.95
410.
2210
106.
7384
3B10
7.41
6610
8.18
8811
0.17
5011
0.46
210.
2870
114.
3000
41 ⁄ 2–
6or
4.50
00–
6U
N11
4.30
004.
2333
2A0.
0787
114.
2213
113.
7590
...
111.
4704
111.
2114
0.25
9110
9.17
942B
109.
7280
110.
4900
111.
5492
111.
8870
0.33
7811
4.30
003A
0.00
0011
4.30
0011
3.83
77..
.11
1.54
9211
1.35
360.
1956
109.
2581
3B10
9.72
8011
0.22
5811
1.54
9211
1.80
060.
2515
114.
3000
41 ⁄ 2–
8or
4.50
00–
8U
N11
4.30
003.
1750
2A0.
0711
114.
2289
113.
8479
...
112.
1664
111.
9276
0.23
8811
0.44
942B
110.
8710
111.
5060
112.
2375
112.
5474
0.30
9911
4.30
003A
0.00
0011
4.30
0011
3.91
90..
.11
2.23
7511
2.05
720.
1803
110.
5205
3B11
0.87
1011
1.24
4411
2.23
7511
2.47
120.
2337
114.
3000
41 ⁄ 2–
12or
4.50
00–
12U
N11
4.30
002.
1167
2A0.
0508
114.
2492
113.
9596
...
112.
8751
112.
7074
0.16
7611
1.72
952B
112.
0140
112.
4712
112.
9259
113.
1443
0.21
8411
4.30
003A
0.00
0011
4.30
0011
4.01
04..
.11
2.92
5911
2.79
890.
1270
111.
7803
3B11
2.01
4011
2.26
2911
2.92
5911
3.09
100.
1651
114.
3000
41 ⁄ 2–
16or
4.50
00–
16U
N11
4.30
001.
5875
2A0.
0457
114.
2543
114.
0155
...
113.
2230
113.
0706
0.15
2411
2.36
452B
112.
5728
112.
9284
113.
2688
113.
4669
0.19
8111
4.30
003A
0.00
0011
4.30
0011
4.06
12..
.11
3.26
8811
3.15
450.
1143
112.
4102
3B11
2.57
2811
2.79
8911
3.26
8811
3.41
610.
1473
114.
3000
45 ⁄ 8–
6or
4.62
50–
6U
N11
7.47
504.
2333
2A0.
0787
117.
3963
116.
9340
...
114.
6454
114.
3838
0.26
1611
2.35
442B
112.
9030
113.
6650
114.
7242
115.
0620
0.33
7811
7.47
503A
0.00
0011
7.47
5011
7.01
27..
.11
4.72
4211
4.52
860.
1956
112.
4331
3B11
2.90
3011
3.40
0811
4.72
4211
4.97
820.
2540
117.
4750
45 ⁄ 8–
8or
4.62
50–
8U
N11
7.47
503.
1750
2A0.
0711
117.
4039
117.
0229
...
115.
3414
115.
1001
0.24
1311
3.62
442B
114.
0460
114.
6810
115.
4125
115.
7249
0.31
2411
7.47
503A
0.00
0011
7.47
5011
7.09
40..
.11
5.41
2511
5.23
220.
1803
113.
6955
3B11
4.04
6011
4.41
9411
5.41
2511
5.64
620.
2337
117.
4750
45 ⁄ 8–
12or
4.62
50–
12U
N11
7.47
502.
1167
2A0.
0508
117.
4242
117.
1346
...
116.
0501
115.
8799
0.17
0211
4.90
452B
115.
1890
115.
6462
116.
1009
116.
3218
0.22
1011
7.47
503A
0.00
0011
7.47
5011
7.18
54..
.11
6.10
0911
5.97
390.
1270
114.
9553
3B11
5.18
9011
5.43
7911
6.10
0911
6.26
600.
1651
117.
4750
45 ⁄ 8–
16or
4.62
50–
16U
N11
7.47
501.
5875
2A0.
0457
117.
4293
117.
1905
...
116.
3980
116.
2456
0.15
2411
5.53
952B
115.
7478
116.
1034
116.
4438
116.
6419
0.19
8111
7.47
503A
0.00
0011
7.47
5011
7.23
62..
.11
6.44
3811
6.32
950.
1143
115.
5852
3B11
5.74
7811
5.97
3911
6.44
3811
6.59
110.
1473
117.
4750
43 ⁄ 4–
4or
4.75
00–
4U
N12
0.65
006.
3500
2A0.
0889
120.
5611
119.
9566
...
116.
4361
116.
1390
0.29
7211
2.99
952B
113.
7666
114.
7318
116.
5250
116.
9137
0.38
8612
0.65
003A
0.00
0012
0.65
0012
0.04
55..
.11
6.52
5011
6.30
150.
2235
113.
0884
3B11
3.76
6611
4.53
8811
6.52
5011
6.81
460.
2896
120.
6500
43 ⁄ 4–
6or
4.75
00–
6U
N12
0.65
004.
2333
2A0.
0787
120.
5713
120.
1090
...
117.
8204
117.
5588
0.26
1611
5.52
942B
116.
0780
116.
8400
117.
8992
118.
2395
0.34
0412
0.65
003A
0.00
0012
0.65
0012
0.18
77..
.11
7.89
9211
7.70
360.
1956
115.
6081
3B11
6.07
8011
6.57
5811
7.89
9211
8.15
570.
2565
120.
6500
43 ⁄ 4–
8or
4.75
00–
8U
N12
0.65
003.
1750
2A0.
0737
120.
5763
120.
1953
...
118.
5139
118.
2726
0.24
1311
6.79
682B
117.
2210
117.
8560
118.
5875
118.
9025
0.31
5012
0.65
003A
0.00
0012
0.65
0012
0.26
90..
.11
8.58
7511
8.40
460.
1829
116.
8705
3B11
7.22
1011
7.59
4411
8.58
7511
8.82
370.
2362
120.
6500
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
122
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
43 ⁄ 4–
12or
4.75
00–
12U
N12
0.65
002.
1167
2A0.
0508
120.
5992
120.
3096
...
119.
2251
119.
0549
0.17
0211
8.07
952B
118.
3640
118.
8212
119.
2759
119.
4968
0.22
1012
0.65
003A
0.00
0012
0.65
0012
0.36
04..
.11
9.27
5911
9.14
890.
1270
118.
1303
3B11
8.36
4011
8.61
2911
9.27
5911
9.44
100.
1651
120.
6500
43 ⁄ 4–
16or
4.75
00–
16U
N12
0.65
001.
5875
2A0.
0457
120.
6043
120.
3655
...
119.
5730
119.
4206
0.15
2411
8.71
452B
118.
9228
119.
2784
119.
6188
119.
8169
0.19
8112
0.65
003A
0.00
0012
0.65
0012
0.41
12..
.11
9.61
8811
9.50
450.
1143
118.
7602
3B11
8.92
2811
9.14
8911
9.61
8811
9.76
860.
1499
120.
6500
47 ⁄ 8–
6or
4.87
50–
6U
N12
3.82
504.
2333
2A0.
0787
123.
7463
123.
2840
...
120.
9954
120.
7313
0.26
4211
8.70
442B
119.
2530
120.
0150
121.
0742
121.
4171
0.34
2912
3.82
503A
0.00
0012
3.82
5012
3.36
27..
.12
1.07
4212
0.87
610.
1981
118.
7831
3B11
9.25
3011
9.75
0812
1.07
4212
1.33
070.
2565
123.
8250
47 ⁄ 8–
8or
4.87
50–
8U
N12
3.82
503.
1750
2A0.
0737
123.
7513
123.
3703
...
121.
6889
121.
4450
0.24
3811
9.97
182B
120.
3960
121.
0310
121.
7625
122.
0800
0.31
7512
3.82
503A
0.00
0012
3.82
5012
3.44
40..
.12
1.76
2512
1.57
960.
1829
120.
0455
3B12
0.39
6012
0.76
9412
1.76
2512
2.00
130.
2388
123.
8250
47 ⁄ 8–
12or
4.87
50–
12U
N12
3.82
502.
1167
2A0.
0508
123.
7742
123.
4846
...
122.
4001
122.
2299
0.17
0212
1.25
452B
121.
5390
121.
9962
122.
4509
122.
6718
0.22
1012
3.82
503A
0.00
0012
3.82
5012
3.53
54..
.12
2.45
0912
2.32
390.
1270
121.
3053
3B12
1.53
9012
1.78
7912
2.45
0912
2.61
600.
1651
123.
8250
47 ⁄ 8–
16or
4.87
50–
16U
N12
3.82
501.
5875
2A0.
0457
123.
7793
123.
5405
...
122.
7480
122.
5956
0.15
2412
1.88
952B
122.
0978
122.
4534
122.
7938
122.
9919
0.19
8112
3.82
503A
0.00
0012
3.82
5012
3.58
62..
.12
2.79
3812
2.67
950.
1143
121.
9352
3B12
2.09
7812
2.32
3912
2.79
3812
2.94
360.
1499
123.
8250
5–4
or5.
0000
–4
UN
127.
0000
6.35
002A
0.09
1412
6.90
8612
6.30
40..
.12
2.78
3612
2.48
130.
3023
119.
3470
2B12
0.11
6612
1.08
1812
2.87
5012
3.26
620.
3912
127.
0000
3A0.
0000
127.
0000
126.
3955
...
122.
8750
122.
6490
0.22
6111
9.43
843B
120.
1166
120.
8888
122.
8750
123.
1697
0.29
4612
7.00
00
5–6
or5.
0000
–6
UN
127.
0000
4.23
332A
0.07
8712
6.92
1312
6.45
90..
.12
4.17
0412
3.90
370.
2667
121.
8794
2B12
2.42
8012
3.19
0012
4.24
9212
4.59
460.
3454
127.
0000
3A0.
0000
127.
0000
126.
5377
...
124.
2492
124.
0511
0.19
8112
1.95
813B
122.
4280
122.
9258
124.
2492
124.
5083
0.25
9112
7.00
00
5–8
or5.
0000
–8
UN
127.
0000
3.17
502A
0.07
3712
6.92
6312
6.54
53..
.12
4.86
3912
4.61
750.
2464
123.
1468
2B12
3.57
1012
4.20
6012
4.93
7512
5.25
760.
3200
127.
0000
3A0.
0000
127.
0000
126.
6190
...
124.
9375
124.
7521
0.18
5412
3.22
053B
123.
5710
123.
9444
124.
9375
125.
1763
0.23
8812
7.00
00
5–12
or5.
0000
–12
UN
127.
0000
2.11
672A
0.05
0812
6.94
9212
6.65
96..
.12
5.57
5112
5.40
490.
1702
124.
4295
2B12
4.71
4012
5.17
1212
5.62
5912
5.84
680.
2210
127.
0000
3A0.
0000
127.
0000
126.
7104
...
125.
6259
125.
4989
0.12
7012
4.48
033B
124.
7140
124.
9629
125.
6259
125.
7935
0.16
7612
7.00
00
5–16
or5.
0000
–16
UN
127.
0000
1.58
752A
0.04
5712
6.95
4312
6.71
55..
.12
5.92
3012
5.76
810.
1549
125.
0645
2B12
5.27
2812
5.62
8412
5.96
8812
6.16
940.
2007
127.
0000
3A0.
0000
127.
0000
126.
7612
...
125.
9688
125.
8545
0.11
4312
5.11
023B
125.
2728
125.
4989
125.
9688
126.
1186
0.14
9912
7.00
00
51 ⁄ 8–
6or
5.12
50–
6U
N13
0.17
504.
2333
2A0.
0813
130.
0937
129.
6314
...
127.
3429
127.
0762
0.26
6712
5.05
182B
125.
6030
126.
3650
127.
4242
127.
7722
0.34
8013
0.17
503A
0.00
0013
0.17
5012
9.71
27..
.12
7.42
4212
7.22
350.
2007
125.
1331
3B12
5.60
3012
6.10
0812
7.42
4212
7.68
580.
2616
130.
1750
51 ⁄ 8–
8or
5.12
50–
8U
N13
0.17
503.
1750
2A0.
0737
130.
1013
129.
7203
...
128.
0389
127.
7925
0.24
6412
6.32
182B
126.
7460
127.
3810
128.
1125
128.
4351
0.32
2613
0.17
503A
0.00
0013
0.17
5012
9.79
40..
.12
8.11
2512
7.92
710.
1854
126.
3955
3B12
6.74
6012
7.11
9412
8.11
2512
8.35
380.
2413
130.
1750
51 ⁄ 8–
12or
5.12
50–
12U
N13
0.17
502.
1167
2A0.
0508
130.
1242
129.
8346
...
128.
7501
128.
5799
0.17
0212
7.60
452B
127.
8890
128.
3462
128.
8009
129.
0244
0.22
3513
0.17
503A
0.00
0013
0.17
5012
9.88
54..
.12
8.80
0912
8.67
130.
1295
127.
6553
3B12
7.88
9012
8.13
7912
8.80
0912
8.96
850.
1676
130.
1750
ASME B1.1-2003 NONMANDATORY APPENDIX C
123
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
51 ⁄ 8–
16or
5.12
50–
16U
N13
0.17
501.
5875
2A0.
0457
130.
1293
129.
8905
...
129.
0980
128.
9431
0.15
4912
8.23
952B
128.
4478
128.
8034
129.
1438
129.
3444
0.20
0713
0.17
503A
0.00
0013
0.17
5012
9.93
62..
.12
9.14
3812
9.02
690.
1168
128.
2852
3B12
8.44
7812
8.67
3912
9.14
3812
9.29
360.
1499
130.
1750
51 ⁄ 4–
4or
5.25
00–
4U
N13
3.35
006.
3500
2A0.
0914
133.
2586
132.
6540
...
129.
1336
128.
8288
0.30
4812
5.69
702B
126.
4666
127.
4318
129.
2250
129.
6213
0.39
6213
3.35
003A
0.00
0013
3.35
0013
2.74
55..
.12
9.22
5012
8.99
640.
2286
125.
7884
3B12
6.46
6612
7.23
8812
9.22
5012
9.52
220.
2972
133.
3500
51 ⁄ 4–
6or
5.25
00–
6U
N13
3.35
004.
2333
2A0.
0813
133.
2687
132.
8064
...
130.
5179
130.
2487
0.26
9212
8.22
682B
128.
7780
129.
5400
130.
5992
130.
9497
0.35
0513
3.35
003A
0.00
0013
3.35
0013
2.88
77..
.13
0.59
9213
0.39
850.
2007
128.
3081
3B12
8.77
8012
9.27
5813
0.59
9213
0.86
080.
2616
133.
3500
51 ⁄ 4–
8or
5.25
00–
8U
N13
3.35
003.
1750
2A0.
0737
133.
2763
132.
8953
...
131.
2139
130.
9649
0.24
8912
9.49
682B
129.
9210
130.
5560
131.
2875
131.
6101
0.32
2613
3.35
003A
0.00
0013
3.35
0013
2.96
90..
.13
1.28
7513
1.10
210.
1854
129.
5705
3B12
9.92
1013
0.29
4413
1.28
7513
1.52
880.
2413
133.
3500
51 ⁄ 4–
12or
5.25
00–
12U
N13
3.35
002.
1167
2A0.
0508
133.
2992
133.
0096
...
131.
9251
131.
7523
0.17
2713
0.77
952B
131.
0640
131.
5212
131.
9759
132.
1994
0.22
3513
3.35
003A
0.00
0013
3.35
0013
3.06
04..
.13
1.97
5913
1.84
630.
1295
130.
8303
3B13
1.06
4013
1.31
2913
1.97
5913
2.14
350.
1676
133.
3500
51 ⁄ 4–
16or
5.25
00–
16U
N13
3.35
001.
5875
2A0.
0457
133.
3043
133.
0655
...
132.
2730
132.
1181
0.15
4913
1.41
452B
131.
6228
131.
9784
132.
3188
132.
5194
0.20
0713
3.35
003A
0.00
0013
3.35
0013
3.11
12..
.13
2.31
8813
2.20
190.
1168
131.
4602
3B13
1.62
2813
1.84
8913
2.31
8813
2.46
860.
1499
133.
3500
53 ⁄ 8–
6or
5.37
50–
6U
N13
6.52
504.
2333
2A0.
0813
136.
4437
135.
9814
...
133.
6929
133.
4237
0.26
9213
1.40
182B
131.
9530
132.
7150
133.
7742
134.
1247
0.35
0513
6.52
503A
0.00
0013
6.52
5013
6.06
27..
.13
3.77
4213
3.57
100.
2032
131.
4831
3B13
1.95
3013
2.45
0813
3.77
4213
4.03
830.
2642
136.
5250
53 ⁄ 8–
8or
5.37
50–
8U
N13
6.52
503.
1750
2A0.
0762
136.
4488
136.
0678
...
134.
3863
134.
1349
0.25
1513
2.66
932B
133.
0960
133.
7310
134.
4625
134.
7876
0.32
5113
6.52
503A
0.00
0013
6.52
5013
6.14
40..
.13
4.46
2513
4.27
460.
1880
132.
7455
3B13
3.09
6013
3.46
9413
4.46
2513
4.70
640.
2438
136.
5250
53 ⁄ 8–
12or
5.37
50–
12U
N13
6.52
502.
1167
2A0.
0508
136.
4742
136.
1846
...
135.
1001
134.
9273
0.17
2713
3.95
452B
134.
2390
134.
6962
135.
1509
135.
3744
0.22
3513
6.52
503A
0.00
0013
6.52
5013
6.23
54..
.13
5.15
0913
5.02
130.
1295
134.
0053
3B13
4.23
9013
4.48
7913
5.15
0913
5.31
850.
1676
136.
5250
53 ⁄ 8–
16or
5.37
50–
16U
N13
6.52
501.
5875
2A0.
0457
136.
4793
136.
2405
...
135.
4480
135.
2931
0.15
4913
4.58
952B
134.
7978
135.
1534
135.
4938
135.
6944
0.20
0713
6.52
503A
0.00
0013
6.52
5013
6.28
62..
.13
5.49
3813
5.37
690.
1168
134.
6352
3B13
4.79
7813
5.02
3913
5.49
3813
5.64
620.
1524
136.
5250
51 ⁄ 2–
4or
5.50
00–
4U
N13
9.70
006.
3500
2A0.
0914
139.
6086
139.
0040
...
135.
4836
135.
1763
0.30
7313
2.04
702B
132.
8166
133.
7818
135.
5750
135.
9764
0.40
1313
9.70
003A
0.00
0013
9.70
0013
9.09
55..
.13
5.57
5013
5.34
390.
2311
132.
1384
3B13
2.81
6613
3.58
8813
5.57
5013
5.87
480.
2997
139.
7000
51 ⁄ 2–
6or
5.50
00–
6U
N13
9.70
004.
2333
2A0.
0813
139.
6187
139.
1564
...
136.
8679
136.
5961
0.27
1813
4.57
682B
135.
1280
135.
8900
136.
9492
137.
3022
0.35
3113
9.70
003A
0.00
0013
9.70
0013
9.23
77..
.13
6.94
9213
6.74
600.
2032
134.
6581
3B13
5.12
8013
5.62
5813
6.94
9213
7.21
330.
2642
139.
7000
51 ⁄ 2–
8or
5.50
00–
8U
N13
9.70
003.
1750
2A0.
0762
139.
6238
139.
2428
...
137.
5613
137.
3099
0.25
1513
5.84
432B
136.
2710
136.
9060
137.
6375
137.
9652
0.32
7713
9.70
003A
0.00
0013
9.70
0013
9.31
90..
.13
7.63
7513
7.44
960.
1880
135.
9205
3B13
6.27
1013
6.64
4413
7.63
7513
7.88
390.
2464
139.
7000
51 ⁄ 2–
12or
5.50
00–
12U
N13
9.70
002.
1167
2A0.
0508
139.
6492
139.
3596
...
138.
2751
138.
1023
0.17
2713
7.12
952B
137.
4140
137.
8712
138.
3259
138.
5519
0.22
6113
9.70
003A
0.00
0013
9.70
0013
9.41
04..
.13
8.32
5913
8.19
630.
1295
137.
1803
3B13
7.41
4013
7.66
2913
8.32
5913
8.49
350.
1676
139.
7000
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
124
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
51 ⁄ 2–
16or
5.50
00–
16U
N13
9.70
001.
5875
2A0.
0457
139.
6543
139.
4155
...
138.
6230
138.
4681
0.15
4913
7.76
452B
137.
9728
138.
3284
138.
6688
138.
8720
0.20
3213
9.70
003A
0.00
0013
9.70
0013
9.46
12..
.13
8.66
8813
8.55
190.
1168
137.
8102
3B13
7.97
2813
8.19
8913
8.66
8813
8.82
120.
1524
139.
7000
55 ⁄ 8–
6or
5.62
50–
6U
N14
2.87
504.
2333
2A0.
0813
142.
7937
142.
3314
...
140.
0429
139.
7686
0.27
4313
7.75
182B
138.
3030
139.
0650
140.
1242
140.
4798
0.35
5614
2.87
503A
0.00
0014
2.87
5014
2.41
27..
.14
0.12
4213
9.91
840.
2057
137.
8331
3B13
8.30
3013
8.80
0814
0.12
4214
0.39
090.
2667
142.
8750
55 ⁄ 8–
8or
5.62
50–
8U
N14
2.87
503.
1750
2A0.
0762
142.
7988
142.
4178
...
140.
7363
140.
4823
0.25
4013
9.01
932B
139.
4460
140.
0810
140.
8125
141.
1427
0.33
0214
2.87
503A
0.00
0014
2.87
5014
2.49
40..
.14
0.81
2514
0.62
200.
1905
139.
0955
3B13
9.44
6013
9.81
9414
0.81
2514
1.05
890.
2464
142.
8750
55 ⁄ 8–
12or
5.62
50–
12U
N14
2.87
502.
1167
2A0.
0508
142.
8242
142.
5346
...
141.
4501
141.
2773
0.17
2714
0.30
452B
140.
5890
141.
0462
141.
5009
141.
7269
0.22
6114
2.87
503A
0.00
0014
2.87
5014
2.58
54..
.14
1.50
0914
1.37
130.
1295
140.
3553
3B14
0.58
9014
0.83
7914
1.50
0914
1.67
100.
1702
142.
8750
55 ⁄ 8–
16or
5.62
50–
16U
N14
2.87
501.
5875
2A0.
0457
142.
8293
142.
5905
...
141.
7980
141.
6406
0.15
7514
0.93
952B
141.
1478
141.
5034
141.
8438
142.
0470
0.20
3214
2.87
503A
0.00
0014
2.87
5014
2.63
62..
.14
1.84
3814
1.72
690.
1168
140.
9852
3B14
1.14
7814
1.37
3914
1.84
3814
1.99
620.
1524
142.
8750
53 ⁄ 4–
4or
5.75
00–
4U
N14
6.05
006.
3500
2A0.
0940
145.
9560
145.
3515
...
141.
8311
141.
5212
0.30
9913
8.39
442B
139.
1666
140.
1318
141.
9250
142.
3289
0.40
3914
6.05
003A
0.00
0014
6.05
0014
5.44
55..
.14
1.92
5014
1.69
140.
2337
138.
4884
3B13
9.16
6613
9.93
8814
1.92
5014
2.22
730.
3023
146.
0500
53 ⁄ 4–
6or
5.75
00–
6U
N14
6.05
004.
2333
2A0.
0813
145.
9687
145.
5064
...
143.
2179
142.
9436
0.27
4314
0.92
682B
141.
4780
142.
2400
143.
2992
143.
6573
0.35
8114
6.05
003A
0.00
0014
6.05
0014
5.58
77..
.14
3.29
9214
3.09
340.
2057
141.
0081
3B14
1.47
8014
1.97
5814
3.29
9214
3.56
840.
2692
146.
0500
53 ⁄ 4–
8or
5.75
00–
8U
N14
6.05
003.
1750
2A0.
0762
145.
9738
145.
5928
...
143.
9113
143.
6573
0.25
4014
2.19
432B
142.
6210
143.
2560
143.
9875
144.
3177
0.33
0214
6.05
003A
0.00
0014
6.05
0014
5.66
90..
.14
3.98
7514
3.79
700.
1905
142.
2705
3B14
2.62
1014
2.99
4414
3.98
7514
4.23
640.
2489
146.
0500
53 ⁄ 4–
12or
5.75
00–
12U
N14
6.05
002.
1167
2A0.
0533
145.
9967
145.
7071
...
144.
6225
144.
4498
0.17
2714
3.47
702B
143.
7640
144.
2212
144.
6759
144.
9019
0.22
6114
6.05
003A
0.00
0014
6.05
0014
5.76
04..
.14
4.67
5914
4.54
630.
1295
143.
5303
3B14
3.76
4014
4.01
2914
4.67
5914
4.84
600.
1702
146.
0500
53 ⁄ 4–
16or
5.75
00–
16U
N14
6.05
001.
5875
2A0.
0483
146.
0017
145.
7630
...
144.
9705
144.
8130
0.15
7514
4.11
202B
144.
3228
144.
6784
145.
0188
145.
2220
0.20
3214
6.05
003A
0.00
0014
6.05
0014
5.81
12..
.14
5.01
8814
4.90
190.
1168
144.
1602
3B14
4.32
2814
4.54
8914
5.01
8814
5.17
120.
1524
146.
0500
57 ⁄ 8–
6or
5.87
50–
6U
N14
9.22
504.
2333
2A0.
0838
149.
1412
148.
6789
...
146.
3904
146.
1135
0.27
6914
4.09
932B
144.
6530
145.
4150
146.
4742
146.
8349
0.36
0714
9.22
503A
0.00
0014
9.22
5014
8.76
27..
.14
6.47
4214
6.26
590.
2083
144.
1831
3B14
4.65
3014
5.15
0814
6.47
4214
6.74
340.
2692
149.
2250
57 ⁄ 8–
8or
5.87
50–
8U
N14
9.22
503.
1750
2A0.
0762
149.
1488
148.
7678
...
147.
0863
146.
8298
0.25
6514
5.36
932B
145.
7960
146.
4310
147.
1625
147.
4953
0.33
2714
9.22
503A
0.00
0014
9.22
5014
8.84
40..
.14
7.16
2514
6.96
950.
1930
145.
4455
3B14
5.79
6014
6.16
9414
7.16
2514
7.41
140.
2489
149.
2250
57 ⁄ 8–
12or
5.87
50–
12U
N14
9.22
502.
1167
2A0.
0533
149.
1717
148.
8821
...
147.
7975
147.
6223
0.17
5314
6.65
202B
146.
9390
147.
3962
147.
8509
148.
0769
0.22
6114
9.22
503A
0.00
0014
9.22
5014
8.93
54..
.14
7.85
0914
7.71
880.
1321
146.
7053
3B14
6.93
9014
7.18
7914
7.85
0914
8.02
100.
1702
149.
2250
57 ⁄ 8–
16or
5.87
50–
16U
N14
9.22
501.
5875
2A0.
0483
149.
1767
148.
9380
...
148.
1455
147.
9880
0.15
7514
7.28
702B
147.
4978
147.
8534
148.
1938
148.
3995
0.20
5714
9.22
503A
0.00
0014
9.22
5014
8.98
62..
.14
8.19
3814
8.07
690.
1168
147.
3352
3B14
7.49
7814
7.72
3914
8.19
3814
8.34
620.
1524
149.
2250
ASME B1.1-2003 NONMANDATORY APPENDIX C
125
Tabl
eC-
1Li
mit
sof
Size
for
Stan
dard
Seri
es(U
N/U
NR)
Thre
ads,
mm
(Con
t’d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UNR
Pitc
hDi
amet
eran
dPi
tch
Diam
eter
and
Min
orFu
nctio
nalD
iam
eter
[Not
esFu
nctio
nalD
iam
eter
Diam
eter
,M
ajor
Diam
eter
(4),
(5)]
[Not
es(4
),(5
)]No
min
alSi
zeSe
ries
Max
.M
ajor
Met
ricEq
uiva
lent
sM
inor
Diam
eter
and
Desi
g-Al
low
-M
ax.
Min
.M
ax.
Tole
r-[N
ote
(6)]
Tole
r-Di
amet
er,
Thre
ads/
in.
natio
nDi
a.Pi
tch
Clas
san
ce[N
ote
(2)]
Min
.[N
ote
(3)]
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
6–4
or6.
0000
–4
UN
152.
4000
6.35
002A
0.09
4015
2.30
6015
1.70
15..
.14
8.18
1114
7.86
610.
3150
144.
7444
2B14
5.51
6614
6.48
1814
8.27
5014
8.68
400.
4089
152.
4000
3A0.
0000
152.
4000
151.
7955
...
148.
2750
148.
0388
0.23
6214
4.83
843B
145.
5166
146.
2888
148.
2750
148.
5798
0.30
4815
2.40
00
6–6
or6.
0000
–6
UN
152.
4000
4.23
332A
0.08
3815
2.31
6215
1.85
39..
.14
9.56
5414
9.28
850.
2769
147.
2743
2B14
7.82
8014
8.59
0014
9.64
9215
0.00
990.
3607
152.
4000
3A0.
0000
152.
4000
151.
9377
...
149.
6492
149.
4409
0.20
8314
7.35
813B
147.
8280
148.
3258
149.
6492
149.
9210
0.27
1815
2.40
00
6–8
or6.
0000
–8
UN
152.
4000
3.17
502A
0.07
6215
2.32
3815
1.94
28..
.15
0.26
1315
0.00
220.
2591
148.
5443
2B14
8.97
1014
9.60
6015
0.33
7515
0.67
280.
3353
152.
4000
3A0.
0000
152.
4000
152.
0190
...
150.
3375
150.
1445
0.19
3014
8.62
053B
148.
9710
149.
3444
150.
3375
150.
5890
0.25
1515
2.40
00
6–12
or6.
0000
–12
UN
152.
4000
2.11
672A
0.05
3315
2.34
6715
2.05
71..
.15
0.97
2515
0.79
730.
1753
149.
8270
2B15
0.11
4015
0.57
1215
1.02
5915
1.25
450.
2286
152.
4000
3A0.
0000
152.
4000
152.
1104
...
151.
0259
150.
8938
0.13
2114
9.88
033B
150.
1140
150.
3629
151.
0259
151.
1960
0.17
0215
2.40
00
6–16
or6.
0000
–16
UN
152.
4000
1.58
752A
0.04
8315
2.35
1715
2.11
30..
.15
1.32
0515
1.16
300.
1575
150.
4620
2B15
0.67
2815
1.02
8415
1.36
8815
1.57
450.
2057
152.
4000
3A0.
0000
152.
4000
152.
1612
...
151.
3688
151.
2494
0.11
9415
0.51
023B
150.
6728
150.
8989
151.
3688
151.
5237
0.15
4915
2.40
00
GEN
ERA
LN
OTE
S:
(a)
Ser
ies
desi
gnat
ion
show
nin
dica
tes
the
UN
thre
adfo
rm;
how
ever
,th
eU
NR
thre
adfo
rmm
aybe
spec
ified
bysu
bsti
tuti
ngU
NR
inpl
ace
ofU
Nin
all
desi
gnat
ions
for
exte
rnal
use
only
.
(b)
Met
ric
valu
esar
eth
ero
unde
d,di
rect
soft
conv
ersi
onof
the
inch
valu
esan
dm
ayno
tm
athe
mat
ical
lyco
mpu
te.
NO
TES
:
(1)
Thre
adcl
asse
sm
aybe
com
bine
d.S
eepa
ra.
4.2.
(2)
For
Clas
s2A
thre
ads
havi
ngan
addi
tive
finis
h,th
em
axim
umm
ajor
and
pitc
hdi
amet
ers,
afte
rco
atin
g,m
ayeq
ual
the
basi
csi
zes,
who
seva
lues
are
the
sam
eas
max
imum
valu
essh
own
for
Clas
s3A
inth
ese
colu
mns
.S
eepa
ra.
4.1.
2.
(3)
For
unfin
ishe
dho
tm
ater
ial,
not
incl
udin
gst
anda
rdfa
sten
ers
wit
hro
lled
thre
ads.
(4)
See
para
.5.
2.1
for
Func
tion
alD
iam
eter
.
(5)
Sin
ceth
ese
tabu
late
dto
lera
nce
valu
esha
vebe
enco
nver
ted
and
then
roun
ded,
they
may
diff
ersl
ight
lyfr
omth
edi
ffer
-en
cebe
twee
nth
eta
bula
ted
max
imum
and
min
imum
valu
es.
(6)
Thes
eva
lues
are
for
refe
renc
eon
ly.
UN
seri
esex
tern
alth
read
max
imum
min
ordi
amet
eris
basi
c(D
1in
para
.11
)fo
rCl
ass
3Aan
dba
sic
min
usal
low
ance
for
Clas
ses
1Aan
d2A
.
(7)
Form
erly
NF.
Not
are
com
men
ded
stan
dard
size
.To
lera
nces
and
allo
wan
ces
are
base
don
one
diam
eter
leng
thof
enga
gem
ent.
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
126
Tabl
eC-
2Li
mit
sof
Size
for
Sele
cted
Com
bina
tion
sof
UN
S/U
NRS
Seri
esTh
read
s,m
m
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tiona
lDia
met
erFu
nctio
nalD
iam
eter
Dia
met
er,
Met
ric
Maj
orD
iam
eter
[Not
es(3
),(4
)][N
otes
(3),
(4)]
Seri
esM
ax.
Maj
orEq
uiva
lent
sM
inor
Dia
met
erN
omin
alSi
zean
dD
esig
na-
Allo
w-
Max
.M
ax.
Tole
r-[N
ote
(5)]
Tole
r-D
iam
eter
,Th
read
s/in
.tio
nD
ia.
Pitc
hCl
ass
ance
[Not
e(2
)]M
in.
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
10–
28or
0.19
0–
28U
NS
4.82
600.
9071
2A0.
0254
4.80
064.
6355
4.21
134.
1275
0.08
383.
7211
2B3.
8354
4.06
404.
2367
4.34
590.
1092
4.82
60
10–
36or
0.19
0–
36U
NS
4.82
600.
7056
2A0.
0229
4.80
314.
6634
4.34
594.
2697
0.07
623.
9624
2B4.
0640
4.24
184.
3688
4.46
790.
0991
4.82
60
10–
40or
0.19
0–
40U
NS
4.82
600.
6350
2A0.
0279
4.79
814.
6152
4.10
974.
0183
0.09
143.
5382
2B3.
6830
3.93
704.
1377
4.25
700.
1194
4.82
60
10–
48or
0.19
0–
48U
NS
4.82
600.
5292
2A0.
0203
4.80
574.
6914
4.46
284.
3967
0.06
604.
1758
2B4.
2418
4.36
884.
4831
4.56
950.
0864
4.82
60
10–
56or
0.19
0–
56U
NS
4.82
600.
4536
2A0.
0178
4.80
824.
7041
4.51
364.
4501
0.06
354.
2672
2B4.
3434
4.44
504.
5314
4.61
260.
0813
4.82
60
12–
36or
0.21
6–
36U
NS
5.48
640.
7056
2A0.
0229
5.46
355.
3238
5.00
634.
9301
0.07
624.
6228
2B4.
7244
4.90
225.
0292
5.12
830.
0991
5.48
64
12–
40or
0.21
6–
40U
NS
5.48
640.
6350
2A0.
0229
5.46
355.
3340
5.05
214.
9784
0.07
374.
7066
2B4.
8006
4.95
305.
0749
5.17
140.
0965
5.48
64
12–
48or
0.21
6–
48U
NS
5.48
640.
5292
2A0.
0203
5.46
615.
3518
5.12
325.
0546
0.06
864.
8362
2B4.
9022
5.02
925.
1435
5.23
240.
0889
5.48
64
12–
56or
0.21
6–
56U
NS
5.48
640.
4536
2A0.
0203
5.46
615.
3619
5.17
145.
1079
0.06
354.
9251
2B5.
0038
5.10
545.
1918
5.27
560.
0838
5.48
64
1 ⁄ 4–
24or
0.25
0–
24U
NS
6.35
001.
0583
2A0.
0279
6.32
216.
1392
5.63
375.
5397
0.09
405.
0622
2B5.
2070
5.46
105.
6617
5.78
360.
1219
6.35
00
1 ⁄ 4–
27or
0.25
0–
27U
NS
6.35
000.
9407
2A0.
0254
6.32
466.
1544
5.71
255.
6236
0.08
895.
2045
2B5.
3340
5.56
265.
7379
5.85
220.
1143
6.35
00
1 ⁄ 4–
36or
0.25
0–
36U
NS
6.35
000.
7056
2A0.
0229
6.32
716.
1874
5.86
995.
7912
0.07
875.
4864
2B5.
5880
5.76
585.
8928
5.99
440.
1016
6.35
00
1 ⁄ 4–
40or
0.25
0–
40U
NS
6.35
000.
6350
2A0.
0229
6.32
716.
1976
5.91
575.
8420
0.07
375.
5702
2B5.
6642
5.81
665.
9385
6.03
500.
0965
6.35
00
1 ⁄ 4–
48or
0.25
0–
48U
NS
6.35
000.
5292
2A0.
0203
6.32
976.
2154
5.98
685.
9182
0.06
865.
6998
2B5.
7658
5.89
286.
0071
6.09
850.
0914
6.35
00
1 ⁄ 4–
56or
0.25
0–
56U
NS
6.35
000.
4536
2A0.
0203
6.32
976.
2255
6.03
505.
9690
0.06
605.
7887
2B5.
8674
5.96
906.
0554
6.13
920.
0838
6.35
00
5 ⁄ 16
–27
or0.
3125
–27
UN
S7.
9375
0.94
072A
0.02
797.
9096
7.73
947.
2974
7.20
600.
0914
6.78
942B
6.90
887.
1374
7.32
547.
4422
0.11
687.
9375
5 ⁄ 16
–36
or0.
3125
–36
UN
S7.
9375
0.70
562A
0.02
297.
9146
7.77
497.
4574
7.37
870.
0787
7.07
392B
7.16
287.
3406
7.48
037.
5844
0.10
417.
9375
5 ⁄ 16
–40
or0.
3125
–40
UN
S7.
9375
0.63
502A
0.02
297.
9146
7.78
517.
5032
7.42
700.
0762
7.15
772B
7.23
907.
3914
7.52
607.
6251
0.09
917.
9375
5 ⁄ 16
–48
or0.
3125
–48
UN
S7.
9375
0.52
922A
0.02
037.
9172
7.80
297.
5743
7.50
320.
0711
7.28
732B
7.36
607.
4930
7.59
467.
6860
0.09
147.
9375
3 ⁄ 8–
18or
0.37
5–
18U
NS
9.52
501.
4111
2A0.
0330
9.49
209.
2710
8.57
508.
4658
0.10
927.
8105
2B8.
0010
8.33
128.
6081
8.75
030.
1422
9.52
50
3 ⁄ 8–
27or
0.37
5–
27U
NS
9.52
500.
9407
2A0.
0279
9.49
719.
3269
8.88
498.
7935
0.09
148.
3769
2B8.
5090
8.73
768.
9129
9.03
220.
1194
9.52
50
ASME B1.1-2003 NONMANDATORY APPENDIX C
127
Tabl
eC-
2Li
mit
sof
Size
for
Sele
cted
Com
bina
tion
sof
UN
S/U
NRS
Seri
esTh
read
s,m
m(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tiona
lDia
met
erFu
nctio
nalD
iam
eter
Dia
met
er,
Met
ric
Maj
orD
iam
eter
[Not
es(3
),(4
)][N
otes
(3),
(4)]
Seri
esM
ax.
Maj
orEq
uiva
lent
sM
inor
Dia
met
erN
omin
alSi
zean
dD
esig
na-
Allo
w-
Max
.M
ax.
Tole
r-[N
ote
(5)]
Tole
r-D
iam
eter
,Th
read
s/in
.tio
nD
ia.
Pitc
hCl
ass
ance
[Not
e(2
)]M
in.
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
3 ⁄ 8–
36or
0.37
5–
36U
NS
9.52
500.
7056
2A0.
0254
9.49
969.
3599
9.04
248.
9611
0.08
138.
6589
2B8.
7630
8.94
089.
0678
9.17
450.
1067
9.52
50
3 ⁄ 8–
40or
0.37
5–
40U
NS
9.52
500.
6350
2A0.
0229
9.50
219.
3726
9.09
079.
0119
0.07
878.
7452
2B8.
8392
8.99
169.
1135
9.21
510.
1016
9.52
50
0.39
0–
27or
0.39
0–
27U
NS
9.90
600.
9407
2A0.
0279
9.87
819.
7079
9.26
599.
1745
0.09
148.
7579
2B8.
8900
9.11
869.
2939
9.41
320.
1194
9.90
60
7 ⁄ 16
–18
or0.
4375
–18
UN
S11
.112
51.
4111
2A0.
0330
11.0
795
10.8
585
10.1
625
10.0
508
0.11
189.
3980
2B9.
5758
9.90
6010
.195
610
.340
30.
1448
11.1
125
7 ⁄ 16
–24
or0.
4375
–24
UN
S11
.112
51.
0583
2A0.
0305
11.0
820
10.8
991
10.3
937
10.2
946
0.09
919.
8222
2B9.
9568
10.2
108
10.4
242
10.5
512
0.12
7011
.112
5
7 ⁄ 16
–27
or0.
4375
–27
UN
S11
.112
50.
9407
2A0.
0279
11.0
846
10.9
144
10.4
724
10.3
784
0.09
409.
9644
2B10
.083
810
.312
410
.500
410
.622
30.
1219
11.1
125
1 ⁄ 2–
12or
0.50
0–
12U
NS
12.7
000
2.11
672A
0.04
0612
.659
412
.369
811
.285
211
.148
10.
1372
10.1
397
2B10
.414
010
.871
211
.325
911
.503
70.
1778
12.7
000
3A0.
0000
12.7
000
12.4
104
11.3
259
11.2
243
0.10
1610
.180
33B
10.4
140
10.6
299
11.3
259
11.4
579
0.13
2112
.700
0
1 ⁄ 2–
14or
0.50
0–
14U
NS
12.7
000
1.81
432A
0.03
8112
.661
912
.400
311
.483
311
.356
30.
1270
10.5
004
2B10
.744
211
.125
211
.521
411
.686
50.
1651
12.7
000
1 ⁄ 2–
18or
0.50
0–
18U
NS
12.7
000
1.41
112A
0.03
3012
.667
012
.446
011
.750
011
.638
30.
1118
10.9
855
2B11
.176
011
.506
211
.783
111
.930
40.
1473
12.7
000
1 ⁄ 2–
24or
0.50
0–
24U
NS
12.7
000
1.05
832A
0.03
0512
.669
512
.486
611
.981
211
.882
10.
0991
11.4
097
2B11
.557
011
.811
012
.011
712
.141
20.
1295
12.7
000
1 ⁄ 2–
27or
0.50
0–
27U
NS
12.7
000
0.94
072A
0.02
7912
.672
112
.501
912
.059
911
.965
90.
0940
11.5
519
2B11
.684
011
.912
612
.087
912
.209
80.
1219
12.7
000
9 ⁄ 16
–14
or0.
5625
–14
UN
S14
.287
51.
8143
2A0.
0381
14.2
494
13.9
878
13.0
708
12.9
438
0.12
7012
.087
92B
12.3
190
12.7
254
13.1
089
13.2
740
0.16
5114
.287
5
9 ⁄ 16
–27
or0.
5625
–27
UN
S14
.287
50.
9407
2A0.
0279
14.2
596
14.0
894
13.6
474
13.5
509
0.09
6513
.139
42B
13.2
588
13.4
874
13.6
754
13.7
998
0.12
4514
.287
5
5 ⁄ 8–
14or
0.62
5–
14U
NS
15.8
750
1.81
432A
0.03
8115
.836
915
.575
314
.658
314
.528
80.
1295
13.6
754
2B13
.919
214
.300
214
.696
414
.864
10.
1676
15.8
750
5 ⁄ 8–
27or
0.62
5–
27U
NS
15.8
750
0.94
072A
0.02
7915
.847
115
.676
915
.234
915
.138
40.
0965
14.7
269
2B14
.859
015
.087
615
.262
915
.389
90.
1270
15.8
750
3 ⁄ 4–
14or
0.75
0–
14U
NS
19.0
500
1.81
432A
0.03
8119
.011
918
.750
317
.833
317
.703
80.
1295
16.8
504
2B17
.094
217
.475
217
.871
418
.041
60.
1702
19.0
500
3 ⁄ 4–
18or
0.75
0–
18U
NS
19.0
500
1.41
112A
0.03
5619
.014
418
.793
518
.097
517
.980
70.
1168
17.3
330
2B17
.526
017
.856
218
.133
118
.285
50.
1524
19.0
500
3 ⁄ 4–
24or
0.75
0–
24U
NS
19.0
500
1.05
832A
0.03
0519
.019
518
.836
618
.331
218
.227
00.
1041
17.7
597
2B17
.907
018
.161
018
.361
718
.496
30.
1346
19.0
500
3 ⁄ 4–
27or
0.75
0–
27U
NS
19.0
500
0.94
072A
0.03
0519
.019
518
.849
318
.407
418
.308
30.
0991
17.8
994
2B18
.034
018
.262
618
.437
918
.567
40.
1295
19.0
500
7 ⁄ 8–
10or
0.87
5–
10U
NS
22.2
250
2.54
002A
0.04
5722
.179
321
.851
620
.528
320
.373
30.
1549
19.1
541
2B19
.481
820
.015
220
.574
020
.774
70.
2007
22.2
250
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
128
Tabl
eC-
2Li
mit
sof
Size
for
Sele
cted
Com
bina
tion
sof
UN
S/U
NRS
Seri
esTh
read
s,m
m(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tiona
lDia
met
erFu
nctio
nalD
iam
eter
Dia
met
er,
Met
ric
Maj
orD
iam
eter
[Not
es(3
),(4
)][N
otes
(3),
(4)]
Seri
esM
ax.
Maj
orEq
uiva
lent
sM
inor
Dia
met
erN
omin
alSi
zean
dD
esig
na-
Allo
w-
Max
.M
ax.
Tole
r-[N
ote
(5)]
Tole
r-D
iam
eter
,Th
read
s/in
.tio
nD
ia.
Pitc
hCl
ass
ance
[Not
e(2
)]M
in.
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
7 ⁄ 8–
18or
0.87
5–
18U
NS
22.2
250
1.41
112A
0.03
5622
.189
421
.968
521
.272
521
.153
10.
1194
20.5
080
2B20
.701
021
.031
221
.308
121
.463
00.
1549
22.2
250
7 ⁄ 8–
24or
0.87
5–
24U
NS
22.2
250
1.05
832A
0.03
0522
.194
522
.011
621
.506
221
.399
50.
1067
20.9
347
2B21
.082
021
.336
021
.536
721
.673
80.
1372
22.2
250
7 ⁄ 8–
27or
0.87
5–
27U
NS
22.2
250
0.94
072A
0.03
0522
.194
522
.024
321
.582
421
.480
80.
1016
21.0
744
2B21
.209
021
.437
621
.612
921
.744
90.
1321
22.2
250
1–
10or
1.00
0–
10U
NS
25.4
000
2.54
002A
0.04
5725
.354
325
.026
623
.703
323
.545
80.
1575
22.3
291
2B22
.656
823
.190
223
.749
023
.952
20.
2032
25.4
000
1–
18or
1.00
0–
18U
NS
25.4
000
1.41
112A
0.03
5625
.364
425
.143
524
.447
524
.328
10.
1194
23.6
830
2B23
.876
024
.206
224
.483
124
.640
50.
1575
25.4
000
1–
24or
1.00
0–
24U
NS
25.4
000
1.05
832A
0.03
3025
.367
025
.184
124
.678
624
.572
00.
1067
24.1
071
2B24
.257
024
.511
024
.711
724
.851
40.
1397
25.4
000
1–
27or
1.00
0–
27U
NS
25.4
000
0.94
072A
0.03
0525
.369
525
.199
324
.757
424
.655
80.
1016
24.2
494
2B24
.384
024
.612
624
.787
924
.919
90.
1321
25.4
000
11 ⁄ 8–
10or
1.12
5–
10U
NS
28.5
750
2.54
002A
0.04
8328
.526
728
.199
126
.875
726
.718
30.
1575
25.5
016
2B25
.831
826
.365
226
.924
027
.129
70.
2057
28.5
750
11 ⁄ 8–
14or
1.12
5–
14U
NS
28.5
750
1.81
432A
0.04
0628
.534
428
.272
727
.355
827
.221
20.
1346
26.3
728
2B26
.619
227
.000
227
.396
427
.571
70.
1753
28.5
750
11 ⁄ 8–
24or
1.12
5–
24U
NS
28.5
750
1.05
832A
0.03
3028
.542
028
.359
127
.853
627
.744
40.
1092
27.2
821
2B27
.432
027
.686
027
.886
728
.028
90.
1422
28.5
750
11 ⁄ 4–
10or
1.25
0–
10U
NS
31.7
500
2.54
002A
0.04
8331
.701
731
.374
130
.050
729
.890
70.
1600
28.6
766
2B29
.006
829
.540
230
.099
030
.307
30.
2083
31.7
500
11 ⁄ 4–
14or
1.25
0–
14U
NS
31.7
500
1.81
432A
0.04
0631
.709
431
.447
730
.530
830
.393
60.
1372
29.5
478
2B29
.794
230
.175
230
.571
430
.749
20.
1778
31.7
500
11 ⁄ 4–
24or
1.25
0–
24U
NS
31.7
500
1.05
832A
0.03
3031
.717
031
.534
131
.028
630
.919
40.
1092
30.4
571
2B30
.607
030
.861
031
.061
731
.203
90.
1422
31.7
500
13 ⁄ 8–
10or
1.37
5–
10U
NS
34.9
250
2.54
002A
0.04
8334
.876
734
.549
133
.225
733
.065
70.
1600
31.8
516
2B32
.181
832
.715
233
.274
033
.482
30.
2083
34.9
250
13 ⁄ 8–
14or
1.37
5–
14U
NS
34.9
250
1.81
432A
0.04
0634
.884
434
.622
733
.705
833
.566
10.
1397
32.7
228
2B32
.969
233
.350
233
.746
433
.926
80.
1803
34.9
250
13 ⁄ 8–
24or
1.37
5–
24U
NS
34.9
250
1.05
832A
0.03
3034
.892
034
.709
134
.203
634
.091
90.
1118
33.6
321
2B33
.782
034
.036
034
.236
734
.381
40.
1448
34.9
250
11 ⁄ 2–
10or
1.50
0–
10U
NS
38.1
000
2.54
002A
0.04
8338
.051
737
.724
136
.400
736
.238
20.
1626
35.0
266
2B35
.356
835
.890
236
.449
036
.659
80.
2108
38.1
000
11 ⁄ 2–
14or
1.50
0–
14U
NS
38.1
000
1.81
432A
0.04
3238
.056
837
.795
236
.878
336
.738
60.
1397
35.8
953
2B36
.144
236
.525
236
.921
437
.104
30.
1829
38.1
000
11 ⁄ 2–
24or
1.50
0–
24U
NS
38.1
000
1.05
832A
0.03
3038
.067
037
.884
137
.378
637
.266
90.
1118
36.8
071
2B36
.957
037
.211
037
.411
737
.559
00.
1473
38.1
000
15 ⁄ 8–
10or
1.62
5–
10U
NS
41.2
750
2.54
002A
0.04
8341
.226
740
.899
139
.575
739
.413
20.
1626
38.2
016
2B38
.531
839
.065
239
.624
039
.834
80.
2108
41.2
750
15 ⁄ 8–
14or
1.62
5–
14U
NS
41.2
750
1.81
432A
0.04
3241
.231
840
.970
240
.053
339
.913
60.
1397
39.0
703
2B39
.319
239
.700
240
.096
440
.279
30.
1829
41.2
750
ASME B1.1-2003 NONMANDATORY APPENDIX C
129
Tabl
eC-
2Li
mit
sof
Size
for
Sele
cted
Com
bina
tion
sof
UN
S/U
NRS
Seri
esTh
read
s,m
m(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tiona
lDia
met
erFu
nctio
nalD
iam
eter
Dia
met
er,
Met
ric
Maj
orD
iam
eter
[Not
es(3
),(4
)][N
otes
(3),
(4)]
Seri
esM
ax.
Maj
orEq
uiva
lent
sM
inor
Dia
met
erN
omin
alSi
zean
dD
esig
na-
Allo
w-
Max
.M
ax.
Tole
r-[N
ote
(5)]
Tole
r-D
iam
eter
,Th
read
s/in
.tio
nD
ia.
Pitc
hCl
ass
ance
[Not
e(2
)]M
in.
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
15 ⁄ 8–
24or
1.62
5–
24U
NS
41.2
750
1.05
832A
0.03
3041
.242
041
.059
140
.553
640
.439
30.
1143
39.9
821
2B40
.132
040
.386
040
.586
740
.734
00.
1473
41.2
750
13 ⁄ 4–
10or
1.75
0–
10U
NS
44.4
500
2.54
002A
0.04
8344
.401
744
.074
142
.750
742
.585
60.
1651
41.3
766
2B41
.706
842
.240
242
.799
043
.012
40.
2134
44.4
500
13 ⁄ 4–
14or
1.75
0–
14U
NS
44.4
500
1.81
432A
0.04
3244
.406
844
.145
243
.228
343
.086
00.
1422
42.2
453
2B42
.494
242
.875
243
.271
443
.456
90.
1854
44.4
500
13 ⁄ 4–
18or
1.75
0–
18U
NS
44.4
500
1.41
112A
0.03
8144
.411
944
.190
943
.495
043
.365
40.
1295
42.7
304
2B42
.926
043
.256
243
.533
143
.700
70.
1676
44.4
500
17 ⁄ 8–
10or
1.87
5–
10U
NS
47.6
250
2.54
002A
0.05
0847
.574
247
.246
545
.923
245
.758
10.
1651
44.5
491
2B44
.881
845
.415
245
.974
046
.189
90.
2159
47.6
250
17 ⁄ 8–
14or
1.87
5–
14U
NS
47.6
250
1.81
432A
0.04
3247
.581
847
.320
246
.403
346
.261
00.
1422
45.4
203
2B45
.669
246
.050
246
.446
446
.631
90.
1854
47.6
250
17 ⁄ 8–
18or
1.87
5–
18U
NS
47.6
250
1.41
112A
0.03
8147
.586
947
.365
946
.670
046
.540
40.
1295
45.9
054
2B46
.101
046
.431
246
.708
146
.875
70.
1676
47.6
250
2–
10or
2.00
0–
10U
NS
50.8
000
2.54
002A
0.05
0850
.749
250
.421
549
.098
248
.933
10.
1651
47.7
241
2B48
.056
848
.590
249
.149
049
.364
90.
2159
50.8
000
2–
14or
2.00
0–
14U
NS
50.8
000
1.81
432A
0.04
3250
.756
850
.495
249
.578
349
.433
50.
1448
48.5
953
2B48
.844
249
.225
249
.621
449
.809
40.
1880
50.8
000
2–
18or
2.00
0–
18U
NS
50.8
000
1.41
112A
0.03
8150
.761
950
.540
949
.845
049
.715
40.
1295
49.0
804
2B49
.276
049
.606
249
.883
150
.053
20.
1702
50.8
000
21 ⁄ 16
–16
or2.
0625
–16
UN
S52
.387
51.
5875
2A0.
0406
52.3
469
52.1
081
51.3
156
51.1
785
0.13
7250
.457
12B
50.6
730
51.0
286
51.3
563
51.5
341
0.17
7852
.387
53A
0.00
0052
.387
552
.148
751
.356
351
.254
70.
1016
50.4
977
3B50
.673
050
.886
451
.356
351
.490
90.
1346
52.3
875
23 ⁄ 16
–16
or2.
1875
–16
UN
S55
.562
51.
5875
2A0.
0406
55.5
219
55.2
831
54.4
906
54.3
535
0.13
7253
.632
12B
53.8
480
54.2
036
54.5
313
54.7
116
0.18
0355
.562
53A
0.00
0055
.562
555
.323
754
.531
354
.427
10.
1041
53.6
727
3B53
.848
054
.061
454
.531
354
.665
90.
1346
55.5
625
21 ⁄ 4–
10or
2.25
0–
10U
NS
57.1
500
2.54
002A
0.05
0857
.099
256
.771
555
.448
255
.280
60.
1676
54.0
741
2B54
.406
854
.940
255
.499
055
.717
40.
2184
57.1
500
21 ⁄ 4–
14or
2.25
0–
14U
NS
57.1
500
1.81
432A
0.04
3257
.106
856
.845
255
.928
355
.780
90.
1473
54.9
453
2B55
.194
255
.575
255
.971
456
.161
90.
1905
57.1
500
21 ⁄ 4–
18or
2.25
0–
18U
NS
57.1
500
1.41
112A
0.04
0657
.109
456
.888
456
.192
456
.060
30.
1321
55.4
279
2B55
.626
055
.956
256
.233
156
.405
80.
1727
57.1
500
25 ⁄ 16
–16
or2.
3125
–16
UN
S58
.737
51.
5875
2A0.
0406
58.6
969
58.4
581
57.6
656
57.5
259
0.13
9756
.807
12B
57.0
230
57.3
786
57.7
063
57.8
866
0.18
0358
.737
53A
0.00
0058
.737
558
.498
757
.706
357
.602
10.
1041
56.8
477
3B57
.023
057
.236
457
.706
357
.840
90.
1346
58.7
375
27 ⁄ 16
–16
or2.
4375
–16
UN
S61
.912
51.
5875
2A0.
0432
61.8
693
61.6
306
60.8
381
60.6
984
0.13
9759
.979
62B
60.1
980
60.5
536
60.8
813
61.0
641
0.18
2961
.912
53A
0.00
0061
.912
561
.673
760
.881
360
.777
10.
1041
60.0
227
3B60
.198
060
.411
460
.881
361
.018
40.
1372
61.9
125
21 ⁄ 2–
10or
2.50
0–
10U
NS
63.5
000
2.54
002A
0.05
0863
.449
263
.121
561
.798
261
.628
00.
1702
60.4
241
2B60
.756
861
.290
261
.849
062
.070
00.
2210
63.5
000
21 ⁄ 2–
14or
2.50
0–
14U
NS
63.5
000
1.81
432A
0.04
3263
.456
863
.195
262
.278
362
.130
90.
1473
61.2
953
2B61
.544
261
.925
262
.321
462
.514
50.
1930
63.5
000
NONMANDATORY APPENDIX C ASME B1.1-2003
标准下载网(www.bzxzw.com)
130
Tabl
eC-
2Li
mit
sof
Size
for
Sele
cted
Com
bina
tion
sof
UN
S/U
NRS
Seri
esTh
read
s,m
m(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tiona
lDia
met
erFu
nctio
nalD
iam
eter
Dia
met
er,
Met
ric
Maj
orD
iam
eter
[Not
es(3
),(4
)][N
otes
(3),
(4)]
Seri
esM
ax.
Maj
orEq
uiva
lent
sM
inor
Dia
met
erN
omin
alSi
zean
dD
esig
na-
Allo
w-
Max
.M
ax.
Tole
r-[N
ote
(5)]
Tole
r-D
iam
eter
,Th
read
s/in
.tio
nD
ia.
Pitc
hCl
ass
ance
[Not
e(2
)]M
in.
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
21 ⁄ 2–
18or
2.50
0–
18U
NS
63.5
000
1.41
112A
0.04
0663
.459
463
.238
462
.542
462
.407
80.
1346
61.7
779
2B61
.976
062
.306
262
.583
162
.758
30.
1753
63.5
000
23 ⁄ 4–
10or
2.75
0–
10U
NS
69.8
500
2.54
002A
0.05
0869
.799
269
.471
568
.148
267
.975
50.
1727
66.7
741
2B67
.106
867
.640
268
.199
068
.422
50.
2235
69.8
500
23 ⁄ 4–
14or
2.75
0–
14U
NS
69.8
500
1.81
432A
0.04
5769
.804
369
.542
768
.625
768
.475
90.
1499
67.6
427
2B67
.894
268
.275
268
.671
468
.867
00.
1956
69.8
500
23 ⁄ 4–
18or
2.75
0–
18U
NS
69.8
500
1.41
112A
0.04
0669
.809
469
.588
468
.892
468
.757
80.
1346
68.1
279
2B68
.326
068
.656
268
.933
169
.110
90.
1778
69.8
500
3–
10or
3.00
0–
10U
NS
76.2
000
2.54
002A
0.05
0876
.149
275
.821
574
.498
274
.325
50.
1727
73.1
241
2B73
.456
873
.990
274
.549
074
.775
10.
2261
76.2
000
3–
14or
3.00
0–
14U
NS
76.2
000
1.81
432A
0.04
5776
.154
375
.892
774
.975
774
.825
90.
1499
73.9
927
2B74
.244
274
.625
275
.021
475
.217
00.
1956
76.2
000
3–
18or
3.00
0–
18U
NS
76.2
000
1.41
112A
0.04
0676
.159
475
.938
475
.242
475
.105
30.
1372
74.4
779
2B74
.676
075
.006
275
.283
175
.460
90.
1778
76.2
000
31 ⁄ 4–
10or
3.25
0–
10U
NS
82.5
500
2.54
002A
0.05
3382
.496
782
.169
080
.845
780
.670
40.
1753
79.4
715
2B79
.806
880
.340
280
.899
081
.125
10.
2261
82.5
500
31 ⁄ 4–
14or
3.25
0–
14U
NS
82.5
500
1.81
432A
0.04
5782
.504
382
.242
781
.325
781
.173
30.
1524
80.3
427
2B80
.594
280
.975
281
.371
481
.569
60.
1981
82.5
500
31 ⁄ 4–
18or
3.25
0–
18U
NS
82.5
500
1.41
112A
0.04
0682
.509
482
.288
481
.592
481
.452
70.
1397
80.8
279
2B81
.026
081
.356
281
.633
181
.813
40.
1803
82.5
500
31 ⁄ 2–
10or
3.50
0–
10U
NS
88.9
000
2.54
002A
0.05
3388
.846
788
.519
087
.195
787
.020
40.
1753
85.8
215
2B86
.156
886
.690
287
.249
087
.477
60.
2286
88.9
000
31 ⁄ 2–
14or
3.50
0–
14U
NS
88.9
000
1.81
432A
0.04
5788
.854
388
.592
787
.675
787
.520
80.
1549
86.6
927
2B86
.944
287
.325
287
.721
487
.922
10.
2007
88.9
000
31 ⁄ 2–
18or
3.50
0–
18U
NS
88.9
000
1.41
112A
0.04
3288
.856
888
.635
887
.939
987
.800
20.
1397
87.1
753
2B87
.376
087
.706
287
.983
188
.165
90.
1829
88.9
000
33 ⁄ 4–
10or
3.75
0–
10U
NS
95.2
500
2.54
002A
0.05
3395
.196
794
.869
093
.545
793
.367
90.
1778
92.1
715
2B92
.506
893
.040
293
.599
093
.830
10.
2311
95.2
500
33 ⁄ 4–
14or
3.75
0–
14U
NS
95.2
500
1.81
432A
0.04
5795
.204
394
.942
794
.025
793
.870
80.
1549
93.0
427
2B93
.294
293
.675
294
.071
494
.272
10.
2007
95.2
500
33 ⁄ 4–
18or
3.75
0–
18U
NS
95.2
500
1.41
112A
0.04
3295
.206
894
.985
894
.289
994
.147
60.
1422
93.5
253
2B93
.726
094
.056
294
.333
194
.515
90.
1829
95.2
500
4–
10or
4.00
0–
10U
NS
101.
6000
2.54
002A
0.05
3310
1.54
6710
1.21
9099
.895
799
.717
90.
1778
98.5
215
2B98
.856
899
.390
299
.949
010
0.18
010.
2311
101.
6000
4–
14or
4.00
0–
14U
NS
101.
6000
1.81
432A
0.04
5710
1.55
4310
1.29
2710
0.37
5710
0.21
820.
1575
99.3
927
2B99
.644
210
0.02
5210
0.42
1410
0.62
460.
2032
101.
6000
41 ⁄ 4–
10or
4.25
0–
10U
NS
107.
9500
2.54
002A
0.05
3310
7.89
6710
7.56
9010
6.24
5710
6.06
530.
1803
104.
8715
2B10
5.20
6810
5.74
0210
6.29
9010
6.53
270.
2337
107.
9500
41 ⁄ 4–
14or
4.25
0–
14U
NS
107.
9500
1.81
432A
0.04
8310
7.90
1710
7.64
0110
6.72
3210
6.56
570.
1575
105.
7402
2B10
5.99
4210
6.37
5210
6.77
1410
6.97
720.
2057
107.
9500
41 ⁄ 2–
10or
4.50
0–
10U
NS
114.
3000
2.54
002A
0.05
3311
4.24
6711
3.91
9011
2.59
5711
2.41
530.
1803
111.
2215
2B11
1.55
6811
2.09
0211
2.64
9011
2.88
520.
2362
114.
3000
ASME B1.1-2003 NONMANDATORY APPENDIX C
131
Tabl
eC-
2Li
mit
sof
Size
for
Sele
cted
Com
bina
tion
sof
UN
S/U
NRS
Seri
esTh
read
s,m
m(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
UN
RM
inor
Func
tiona
lDia
met
erFu
nctio
nalD
iam
eter
Dia
met
er,
Met
ric
Maj
orD
iam
eter
[Not
es(3
),(4
)][N
otes
(3),
(4)]
Seri
esM
ax.
Maj
orEq
uiva
lent
sM
inor
Dia
met
erN
omin
alSi
zean
dD
esig
na-
Allo
w-
Max
.M
ax.
Tole
r-[N
ote
(5)]
Tole
r-D
iam
eter
,Th
read
s/in
.tio
nD
ia.
Pitc
hCl
ass
ance
[Not
e(2
)]M
in.
[Not
e(2
)]M
in.
ance
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
ance
Min
.
41 ⁄ 2–
14or
4.50
0–
14U
NS
114.
3000
1.81
432A
0.04
8311
4.25
1711
3.99
0111
3.07
3211
2.91
320.
1600
112.
0902
2B11
2.34
4211
2.72
5211
3.12
1411
3.32
720.
2057
114.
3000
43 ⁄ 4–
10or
4.75
0–
10U
NS
120.
6500
2.54
002A
0.05
5912
0.59
4112
0.26
6511
8.94
3111
8.76
020.
1829
117.
5690
2B11
7.90
6811
8.44
0211
8.99
9011
9.23
520.
2362
120.
6500
43 ⁄ 4–
14or
4.75
0–
14U
NS
120.
6500
1.81
432A
0.04
8312
0.60
1712
0.34
0111
9.42
3211
9.26
320.
1600
118.
4402
2B11
8.69
4211
9.07
5211
9.47
1411
9.67
970.
2083
120.
6500
5–
10or
5.00
0–
10U
NS
127.
0000
2.54
002A
0.05
5912
6.94
4112
6.61
6512
5.29
3112
5.11
020.
1829
123.
9190
2B12
4.25
6812
4.79
0212
5.34
9012
5.58
780.
2388
127.
0000
5–
14or
5.00
0–
14U
NS
127.
0000
1.81
432A
0.04
8312
6.95
1712
6.69
0112
5.77
3212
5.61
320.
1626
124.
7902
2B12
5.04
4212
5.42
5212
5.82
1412
6.03
230.
2108
127.
0000
51 ⁄ 4–
10or
5.25
0–
10U
NS
133.
3500
2.54
002A
0.05
5913
3.29
4113
2.96
6513
1.64
3113
1.45
770.
1854
130.
2690
2B13
0.60
6813
1.14
0213
1.69
9013
1.93
780.
2388
133.
3500
51 ⁄ 4–
14or
5.25
0–
14U
NS
133.
3500
1.81
432A
0.04
8313
3.30
1713
3.04
0113
2.12
3213
1.96
060.
1626
131.
1402
2B13
1.39
4213
1.77
5213
2.17
1413
2.38
230.
2108
133.
3500
51 ⁄ 2–
10or
5.50
0–
10U
NS
139.
7000
2.54
002A
0.05
5913
9.64
4113
9.31
6513
7.99
3113
7.80
770.
1854
136.
6190
2B13
6.95
6813
7.49
0213
8.04
9013
8.29
030.
2413
139.
7000
51 ⁄ 2–
14or
5.50
0–
14U
NS
139.
7000
1.81
432A
0.04
8313
9.65
1713
9.39
0113
8.47
3213
8.31
060.
1626
137.
4902
2B13
7.74
4213
8.12
5213
8.52
1413
8.73
480.
2134
139.
7000
53 ⁄ 4–
10or
5.75
0–
10U
NS
146.
0500
2.54
002A
0.05
5914
5.99
4114
5.66
6514
4.34
3114
4.15
770.
1854
142.
9690
2B14
3.30
6814
3.84
0214
4.39
9014
4.64
030.
2413
146.
0500
53 ⁄ 4–
14or
5.75
0–
14U
NS
146.
0500
1.81
432A
0.04
8314
6.00
1714
5.74
0114
4.82
3214
4.65
810.
1651
143.
8402
2B14
4.09
4214
4.47
5214
4.87
1414
5.08
480.
2134
146.
0500
6–
10or
6.00
0–
10U
NS
152.
4000
2.54
002A
0.05
5915
2.34
4115
2.01
6515
0.69
3115
0.50
520.
1880
149.
3190
2B14
9.65
6815
0.19
0215
0.74
9015
0.99
280.
2438
152.
4000
6–
14or
6.00
0–
14U
NS
152.
4000
1.81
432A
0.05
0815
2.34
9215
2.08
7615
1.17
0615
1.00
550.
1651
150.
1877
2B15
0.44
4215
0.82
5215
1.22
1415
1.43
730.
2159
152.
4000
GEN
ERA
LN
OTE
:S
erie
sde
sign
atio
nsh
own
indi
cate
sth
eU
Nth
read
form
;ho
wev
er,
the
UN
Rth
read
form
may
besp
ecifi
edby
subs
titu
ting
UN
Rin
plac
eof
UN
inal
lde
sign
atio
nsfo
rex
tern
alus
eon
ly.
NO
TES
:(1
)Th
read
clas
ses
may
beco
mbi
ned.
See
para
.4.
2.(2
)Fo
rCl
ass
2Ath
read
sha
ving
anad
diti
vefin
ish,
the
max
imum
maj
oran
dpi
tch
diam
eter
s,af
ter
coat
ing,
may
equa
lth
eba
sic
size
s,w
hose
valu
esar
eth
esa
me
asm
axim
umva
lues
show
nfo
rCl
ass
3Ain
thes
eco
lum
ns.
See
para
.4.
1.2.
(3)
See
para
.5.
2.1
for
Func
tion
alD
iam
eter
.(4
)S
ince
thes
eta
bula
ted
tole
ranc
eva
lues
have
been
conv
erte
dan
dth
enro
unde
d,th
eym
aydi
ffer
slig
htly
from
the
diff
er-
ence
betw
een
the
tabu
late
dm
axim
uman
dm
inim
umva
lues
.(5
)Th
ese
valu
esar
efo
rre
fere
nce
only
.U
Nse
ries
exte
rnal
thre
adm
axim
umm
inor
diam
eter
isba
sic
(D1
inpa
ra.
11)
for
Clas
s3A
and
basi
cm
inus
allo
wan
cefo
rCl
asse
s1A
and
2A.
NONMANDATORY APPENDIX C ASME B1.1-2003
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ASME B1.1-2003 NONMANDATORY APPENDIX C
Table C-3 Thread Form Data, mm
0.1875H[Note (1)]
0.2500HTruncation of0.1250H [Note (1)]UNR Design[Note (1)] Profile External
Basic Flat at Flat at Truncation of External Thread Root0.1667HInternal Internal Internal Thread Root and
H [Note (1)]Thread Crest, Thread Root Thread Root and Half Truncation of[Note (1)]and External and External and External External Addendum of Internal
UN Thread Thread Crest, Height of Thread Crest, Thread Root External Thread Crest,Root, Frs p Frn p Fcs p Sharp frn p fes p Full Radius, Thread, frs p fcn p
Threads/ Fcn p P/4 p P/8 p V-Thread p 0.10825318P Max., rrs p Srs p 0.21650635Pin. Pitch, P 0.25000000P 0.12500000P 0.86602540P [Note (2)] 0.14433757P 0.16237976P [Note (3)]
1 2 3 4 5 6 7 8 9
80 0.31750 0.0794 0.0397 0.2750 0.0344 0.0458 0.0516 0.068772 0.35278 0.0882 0.0441 0.3055 0.0382 0.0509 0.0573 0.076464 0.39688 0.0992 0.0496 0.3437 0.0430 0.0573 0.0644 0.085956 0.45357 0.1134 0.0567 0.3928 0.0491 0.0655 0.0737 0.098248 0.52917 0.1323 0.0661 0.4583 0.0573 0.0764 0.0859 0.114644 0.57727 0.1443 0.0722 0.4999 0.0625 0.0833 0.0937 0.1250
40 0.63500 0.1588 0.0794 0.5499 0.0687 0.0916 0.1031 0.137536 0.70556 0.1764 0.0882 0.6110 0.0764 0.1018 0.1146 0.152832 0.79375 0.1985 0.0992 0.6874 0.0859 0.1146 0.1289 0.171928 0.90714 0.2268 0.1134 0.7856 0.0982 0.1309 0.1473 0.196427 0.94074 0.2352 0.1176 0.8147 0.1018 0.1358 0.1528 0.203724 1.05833 0.2646 0.1323 0.9165 0.1146 0.1528 0.1719 0.2291
20 1.27000 0.3175 0.1588 1.0998 0.1375 0.1833 0.2062 0.275018 1.41111 0.3528 0.1764 1.2221 0.1528 0.2037 0.2291 0.305516 1.58750 0.3969 0.1985 1.3748 0.1719 0.2291 0.2578 0.343714 1.81429 0.4536 0.2268 1.5712 0.1964 0.2619 0.2946 0.392813 1.95385 0.4885 0.2442 1.6921 0.2115 0.2820 0.3173 0.423012 2.11667 0.5292 0.2646 1.8331 0.2291 0.3055 0.3437 0.4583
11.5 2.20870 0.5522 0.2761 1.9128 0.2391 0.3188 0.3586 0.478211 2.30909 0.5773 0.2886 1.9997 0.2500 0.3333 0.3750 0.499910 2.54000 0.6350 0.3175 2.1997 0.2750 0.3666 0.4124 0.5499
9 2.82222 0.7056 0.3528 2.4441 0.3055 0.4074 0.4583 0.61108 3.17500 0.7938 0.3969 2.7496 0.3437 0.4583 0.5155 0.6874
7 3.62857 0.9071 0.4536 3.1424 0.3928 0.5237 0.5892 0.78566 4.23333 1.0583 0.5292 3.6662 0.4583 0.6110 0.6874 0.91655 5.08000 1.2700 0.6350 4.3994 0.5499 0.7332 0.8249 1.09984.5 5.64444 1.4111 0.7056 4.8882 0.6110 0.8147 0.9165 1.22214 6.35000 1.5875 0.7938 5.4993 0.6874 0.9165 1.0311 1.3748
132
NONMANDATORY APPENDIX C ASME B1.1-2003
Table C-3 Thread Form Data, mm (Cont’d)
0.625H[Note (1)]
Height of0.9167H 1.2500HInternal[Note (1)] [Note (1)]Thread, UN
0.375H 0.7500H 1.3750HExternal Difference Double[Note (1)] [Note (1)] [Note (1)]Thread, and Between Height of
0.6875HAddendum Depth of Twice the Max. Major Internal Double[Note (1)]of External Thread External and Pitch Thread and Height of
Thread, Engagement, Height of Thread Diameters of External UN External UNR0.5000Hhas p hs p hn p UNR External Addendum, Internal Thread, Thread,[Note (1)]Threads/ 0.32475953P he p Thread, hs p hb p 2has p Thread p 2hn p 2hs p
in. [Note (4)] 0.54126588P 0.59539247P 0.64951905P 0.79385662P 1.08253175P 1.19078493P 0.43301270P
1 10 11 12 13 14 15 16 17
80 0.1031 0.1719 0.1890 0.2062 0.2520 0.3437 0.3781 0.137572 0.1146 0.1910 0.2100 0.2291 0.2801 0.3819 0.4201 0.152864 0.1289 0.2148 0.2363 0.2578 0.3151 0.4296 0.4726 0.171956 0.1473 0.2455 0.2701 0.2946 0.3601 0.4910 0.5401 0.196448 0.1719 0.2864 0.3151 0.3437 0.4201 0.5728 0.6301 0.229144 0.1875 0.3124 0.3437 0.3750 0.4583 0.6249 0.6874 0.2500
40 0.2062 0.3437 0.3781 0.4124 0.5041 0.6874 0.7562 0.275036 0.2291 0.3819 0.4201 0.4583 0.5601 0.7638 0.8402 0.305532 0.2578 0.4296 0.4726 0.5155 0.6301 0.8593 0.9452 0.343728 0.2946 0.4910 0.5401 0.5892 0.7201 0.9820 1.0802 0.392827 0.3055 0.5092 0.5601 0.6110 0.7468 1.0184 1.1202 0.407424 0.3437 0.5728 0.6301 0.6874 0.8402 1.1457 1.2602 0.4583
20 0.4124 0.6874 0.7562 0.8249 1.0082 1.3748 1.5123 0.549918 0.4583 0.7638 0.8402 0.9165 1.1202 1.5276 1.6803 0.611016 0.5155 0.8593 0.9452 1.0311 1.2602 1.7185 1.8904 0.687414 0.5892 0.9820 1.0802 1.1784 1.4403 1.9640 2.1604 0.785613 0.6345 1.0576 1.1633 1.2691 1.5511 2.1151 2.3266 0.846012 0.6874 1.1457 1.2602 1.3748 1.6803 2.2914 2.5205 0.9165
11.5 0.7173 1.1955 1.3150 1.4346 1.7534 2.3910 2.6301 0.956411 0.7499 1.2498 1.3748 1.4998 1.8331 2.4997 2.7496 0.999910 0.8249 1.3748 1.5123 1.6498 2.0164 2.7496 3.0246 1.0998
9 0.9165 1.5276 1.6803 1.8331 2.2404 3.0551 3.3606 1.22218 1.0311 1.7185 1.8904 2.0622 2.5205 3.4370 3.7807 1.3748
7 1.1784 1.9640 2.1604 2.3568 2.8806 3.9280 4.3208 1.57126 1.3748 2.2914 2.5205 2.7496 3.3606 4.5827 5.0410 1.83315 1.6498 2.7496 3.0246 3.2996 4.0328 5.4993 6.0492 2.19974.5 1.8331 3.0551 3.3606 3.6662 4.4809 6.1103 6.7213 2.44414 2.0622 3.4370 3.7807 4.1245 5.0410 6.8741 7.5615 2.7496
GENERAL NOTES:
(a) All dimensions are in millimeters (except for threads per inch, col. 1).(b) Metric values are the rounded, direct soft conversion of the inch values and do not comply to ASME B1.30 and may
not mathematically compute. They should be used for reference only.(c) All thread calculations are to be performed using a function of pitch (P); the use of thread height (H) is for reference
only as stated in ASME B1.30.
NOTES:(1) The thread values based on a function of height “H” are used for reference only.
(2) The values tabulated in col. 6 also pertain to the minimum root radius of UNR screw threads. See paras. 2.3.1 and2.3.1(a).
(3) han p fcn p 0.25H p 0.21650635P
(4) hdn p has p 0.375H p 0.32475953P
133
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ASME B1.1-2003
NONMANDATORY APPENDIX DSPECIAL THREADS
Newly created special thread dimensions shall bedetermined by use of the formulas in the body of thisstandard and the employment of the rounding rules setforth by ASME B1.30.
Existing special thread dimensions developed fromprevious editions of B1.1 and using rounding rules otherthan those contained in B1.30 may differ. Previouslyestablished special thread dimensions are acceptable forcontinued use.
134
This Appendix contains Table D-1 (formerly Table 3Bin B1.1-1989) which contains tabulated values for manyof the more commonly used nonstandard thread sizes.Also contained are Tables D-2 through D-11 (formerlyTables 31 through 40 in B1.1-1989). These tables wereused in the past to calculate special thread sizes.
NONMANDATORY APPENDIX D ASME B1.1-2003
Tabl
eD
-1Li
mit
sof
Size
for
Sele
cted
Com
bina
tion
sof
UN
S/U
NRS
Seri
esTh
read
s
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UN
RPi
tch
Dia
met
eran
dM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(3
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(3)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Max
.To
lera
nce
[Not
e(5
)]D
iam
eter
,Th
read
s/in
.na
tion
Clas
sA
llow
ance
[Not
e(2
)]M
in.
[Not
e(2
)]M
in.
[Not
e(4
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
(6)
10–
28or
0.19
0–
28U
NS
2A0.
0010
0.18
900.
1825
0.16
580.
1625
0.00
3339
0.14
652B
0.15
10.
160
0.16
680.
1711
0.00
430.
1900
(6)
10–
36or
0.19
0–
36U
NS
2A0.
0009
0.18
910.
1836
0.17
110.
1681
0.00
2988
0.15
602B
0.16
00.
167
0.17
200.
1759
0.00
390.
1900
(6)
10–
40or
0.19
0–
40U
NS
2A0.
0009
0.18
910.
1840
0.17
290.
1700
0.00
2856
0.15
932B
0.16
30.
169
0.17
380.
1775
0.00
370.
1900
10–
48or
0.19
0–
48U
NS
2A0.
0008
0.18
920.
1847
0.17
570.
1731
0.00
2648
0.16
442B
0.16
70.
172
0.17
650.
1799
0.00
340.
1900
(6)
10–
56or
0.19
0–
56U
NS
2A0.
0007
0.18
930.
1852
0.17
770.
1752
0.00
2488
0.16
802B
0.17
10.
175
0.17
840.
1816
0.00
320.
1900
(6)
12–
36or
0.21
6–
36U
NS
2A0.
0009
0.21
510.
2096
0.19
710.
1941
0.00
3026
0.18
202B
0.18
60.
193
0.19
800.
2019
0.00
390.
2160
(6)
12–
40or
0.21
6–
40U
NS
2A0.
0009
0.21
510.
2100
0.19
890.
1960
0.00
2894
0.18
532B
0.18
90.
195
0.19
980.
2036
0.00
380.
2160
(6)
12–
48or
0.21
6–
48U
NS
2A0.
0008
0.21
520.
2107
0.20
170.
1990
0.00
2686
0.19
042B
0.19
30.
198
0.20
250.
2060
0.00
350.
2160
(6)
12–
56or
0.21
6–
56U
NS
2A0.
0008
0.21
520.
2111
0.20
360.
2011
0.00
2526
0.19
392B
0.19
70.
201
0.20
440.
2077
0.00
330.
2160
1 ⁄ 4–
24or
0.25
0–
24U
NS
2A0.
0011
0.24
890.
2417
0.22
180.
2181
0.00
3667
0.19
932B
0.20
50.
215
0.22
290.
2277
0.00
480.
2500
1 ⁄ 4–
27or
0.25
0–
27U
NS
2A0.
0010
0.24
900.
2423
0.22
490.
2214
0.00
3478
0.20
492B
0.21
00.
219
0.22
590.
2304
0.00
450.
2500
(6)
1 ⁄ 4–
36or
0.25
0–
36U
NS
2A0.
0009
0.24
910.
2436
0.23
110.
2280
0.00
3071
0.21
602B
0.22
00.
227
0.23
200.
2360
0.00
400.
2500
1 ⁄ 4–
40or
0.25
0–
40U
NS
2A0.
0009
0.24
910.
2440
0.23
290.
2300
0.00
2939
0.21
932B
0.22
30.
229
0.23
380.
2376
0.00
380.
2500
(6)
1 ⁄ 4–
48or
0.25
0–
48U
NS
2A0.
0008
0.24
920.
2447
0.23
570.
2330
0.00
2731
0.22
442B
0.22
70.
232
0.23
650.
2401
0.00
360.
2500
(6)
1 ⁄ 4–
56or
0.25
0–
56U
NS
2A0.
0008
0.24
920.
2451
0.23
760.
2350
0.00
2571
0.22
792B
0.23
10.
235
0.23
840.
2417
0.00
330.
2500
(6)
5 ⁄ 16–
27or
0.31
25–
27U
NS
2A0.
0011
0.31
140.
3047
0.28
730.
2837
0.00
3551
0.26
732B
0.27
20.
281
0.28
840.
2930
0.00
460.
3125
(6)
5 ⁄ 16–
36or
0.31
25–
36U
NS
2A0.
0009
0.31
160.
3061
0.29
360.
2905
0.00
3144
0.27
852B
0.28
20.
289
0.29
450.
2986
0.00
410.
3125
(6)
5 ⁄ 16–
40or
0.31
25–
40U
NS
2A0.
0009
0.31
160.
3065
0.29
540.
2924
0.00
3012
0.28
182B
0.28
50.
291
0.29
630.
3002
0.00
390.
3125
(6)
5 ⁄ 16–
48or
0.31
25–
48U
NS
2A0.
0008
0.31
170.
3072
0.29
820.
2954
0.00
2804
0.28
692B
0.29
00.
295
0.29
900.
3026
0.00
360.
3125
135
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ASME B1.1-2003 NONMANDATORY APPENDIX D
Tabl
eD
-1Li
mit
sof
Size
for
Sele
cted
Com
bina
tion
sof
UN
S/U
NRS
Seri
esTh
read
s(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UN
RPi
tch
Dia
met
eran
dM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(3
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(3)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Max
.To
lera
nce
[Not
e(5
)]D
iam
eter
,Th
read
s/in
.na
tion
Clas
sA
llow
ance
[Not
e(2
)]M
in.
[Not
e(2
)]M
in.
[Not
e(4
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
(6)
3 ⁄ 8–
18or
0.37
5–
18U
NS
2A0.
0013
0.37
370.
3650
0.33
760.
3333
0.00
4327
0.30
752B
0.31
50.
328
0.33
890.
3445
0.00
560.
3750
3 ⁄ 8–
27or
0.37
5–
27U
NS
2A0.
0011
0.37
390.
3672
0.34
980.
3462
0.00
3615
0.32
982B
0.33
50.
344
0.35
090.
3556
0.00
470.
3750
3 ⁄ 8–
36or
0.37
5–
36U
NS
2A0.
0010
0.37
400.
3685
0.35
600.
3528
0.00
3208
0.34
092B
0.34
50.
352
0.35
700.
3612
0.00
420.
3750
3 ⁄ 8–
40or
0.37
5–
40U
NS
2A0.
0009
0.37
410.
3690
0.35
790.
3548
0.00
3076
0.34
432B
0.34
80.
354
0.35
880.
3628
0.00
400.
3750
0.39
0–
27or
0.39
0–
27U
NS
2A0.
0011
0.38
890.
3822
0.36
480.
3612
0.00
3629
0.34
482B
0.35
00.
359
0.36
590.
3706
0.00
470.
3900
(6)
7 ⁄ 16–
18or
0.43
75–
18U
NS
2A0.
0013
0.43
620.
4275
0.40
010.
3957
0.00
4384
0.37
002B
0.37
70.
390
0.40
140.
4071
0.00
570.
4375
(6)
7 ⁄ 16–
24or
0.43
75–
24U
NS
2A0.
0012
0.43
630.
4291
0.40
920.
4053
0.00
3861
0.38
672B
0.39
20.
402
0.41
040.
4154
0.00
500.
4375
(6)
7 ⁄ 16–
27or
0.43
75–
27U
NS
2A0.
0011
0.43
640.
4297
0.41
230.
4086
0.00
3672
0.39
232B
0.39
70.
406
0.41
340.
4182
0.00
480.
4375
(6)
1 ⁄ 2–
12or
0.50
0–
12U
NS
2A0.
0016
0.49
840.
4870
0.44
430.
4389
0.00
5352
0.39
922B
0.41
00.
428
0.44
590.
4529
0.00
700.
5000
(6)
3A0.
0000
0.50
000.
4886
0.44
590.
4419
0.00
4000
0.40
083B
0.41
000.
4185
0.44
590.
4511
0.00
520.
5000
(6)
1 ⁄ 2–
14or
0.50
0–
14U
NS
2A0.
0015
0.49
850.
4882
0.45
210.
4471
0.00
4976
0.41
342B
0.42
30.
438
0.45
360.
4601
0.00
650.
5000
(6)
1 ⁄ 2–
18or
0.50
0–
18U
NS
2A0.
0013
0.49
870.
4900
0.46
260.
4582
0.00
4436
0.43
252B
0.44
00.
453
0.46
390.
4697
0.00
580.
5000
1 ⁄ 2–
24or
0.50
0–
24U
NS
2A0.
0012
0.49
880.
4916
0.47
170.
4678
0.00
3913
0.44
922B
0.45
50.
465
0.47
290.
4780
0.00
510.
5000
1 ⁄ 2–
27or
0.50
0–
27U
NS
2A0.
0011
0.49
890.
4922
0.47
480.
4711
0.00
3724
0.45
482B
0.46
00.
469
0.47
590.
4807
0.00
480.
5000
(6)
9 ⁄ 16
–14
or0.
5625
–14
UN
S2A
0.00
150.
5610
0.55
070.
5146
0.50
960.
0050
230.
4759
2B0.
485
0.50
10.
5161
0.52
260.
0065
0.56
25
(6)
9 ⁄ 16
–27
or0.
5625
–27
UN
S2A
0.00
110.
5614
0.55
470.
5373
0.53
350.
0037
710.
5173
2B0.
522
0.53
10.
5384
0.54
330.
0049
0.56
25
(6)
5 ⁄ 8–
14or
0.62
5–
14U
NS
2A0.
0015
0.62
350.
6132
0.57
710.
5720
0.00
5067
0.53
842B
0.54
80.
563
0.57
860.
5852
0.00
660.
6250
5 ⁄ 8–
27or
0.62
5–
27U
NS
2A0.
0011
0.62
390.
6172
0.59
980.
5960
0.00
3815
0.57
982B
0.58
50.
594
0.60
090.
6059
0.00
500.
6250
(6)
3 ⁄ 4–
14or
0.75
0–
14U
NS
2A0.
0015
0.74
850.
7382
0.70
210.
6970
0.00
5148
0.66
342B
0.67
30.
688
0.70
360.
7103
0.00
670.
7500
136
NONMANDATORY APPENDIX D ASME B1.1-2003
Tabl
eD
-1Li
mit
sof
Size
for
Sele
cted
Com
bina
tion
sof
UN
S/U
NRS
Seri
esTh
read
s(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UN
RPi
tch
Dia
met
eran
dM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(3
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(3)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Max
.To
lera
nce
[Not
e(5
)]D
iam
eter
,Th
read
s/in
.na
tion
Clas
sA
llow
ance
[Not
e(2
)]M
in.
[Not
e(2
)]M
in.
[Not
e(4
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
(6)
3 ⁄ 4–
18or
0.75
0–
18U
NS
2A0.
0014
0.74
860.
7399
0.71
250.
7079
0.00
4608
0.68
242B
0.69
00.
703
0.71
390.
7199
0.00
600.
7500
3 ⁄ 4–
24or
0.75
0–
24U
NS
2A0.
0012
0.74
880.
7416
0.72
170.
7176
0.00
4085
0.69
922B
0.70
50.
715
0.72
290.
7282
0.00
530.
7500
3 ⁄ 4–
27or
0.75
0–
27U
NS
2A0.
0012
0.74
880.
7421
0.72
470.
7208
0.00
3896
0.70
472B
0.71
00.
719
0.72
590.
7310
0.00
510.
7500
(6)
7 ⁄ 8–
10or
0.87
5–
10U
NS
2A0.
0018
0.87
320.
8603
0.80
820.
8021
0.00
6090
0.75
412B
0.76
70.
788
0.81
000.
8179
0.00
790.
8750
(6)
7 ⁄ 8–
18or
0.87
5–
18U
NS
2A0.
0014
0.87
360.
8649
0.83
750.
8328
0.00
4680
0.80
742B
0.81
50.
828
0.83
890.
8450
0.00
610.
8750
(6)
7 ⁄ 8–
24or
0.87
5–
24U
NS
2A0.
0012
0.87
380.
8666
0.84
670.
8425
0.00
4157
0.82
422B
0.83
00.
840
0.84
790.
8533
0.00
540.
8750
(6)
7 ⁄ 8–
27or
0.87
5–
27U
NS
2A0.
0012
0.87
380.
8671
0.84
970.
8457
0.00
3968
0.82
972B
0.83
50.
844
0.85
090.
8561
0.00
520.
8750
(6)
1–
10or
1.00
0–
10U
NS
2A0.
0018
0.99
820.
9853
0.93
320.
9270
0.00
6155
0.87
912B
0.89
20.
913
0.93
500.
9430
0.00
801.
0000
(6)
1–
18or
1.00
0–
18U
NS
2A0.
0014
0.99
860.
9899
0.96
250.
9578
0.00
4745
0.93
242B
0.94
00.
953
0.96
390.
9701
0.00
621.
0000
1–
24or
1.00
0–
24U
NS
2A0.
0013
0.99
870.
9915
0.97
160.
9674
0.00
4222
0.94
912B
0.95
50.
965
0.97
290.
9784
0.00
551.
0000
1–
27or
1.00
0–
27U
NS
2A0.
0012
0.99
880.
9921
0.97
470.
9707
0.00
4033
0.95
472B
0.96
00.
969
0.97
590.
9811
0.00
521.
0000
(6)
11 ⁄ 8–
10or
1.12
5–
10U
NS
2A0.
0019
1.12
311.
1102
1.05
811.
0519
0.00
6215
1.00
402B
1.01
71.
038
1.06
001.
0681
0.00
811.
1250
(6)
11 ⁄ 8–
14or
1.12
5–
14U
NS
2A0.
0016
1.12
341.
1131
1.07
701.
0717
0.00
5345
1.03
832B
1.04
81.
063
1.07
861.
0855
0.00
691.
1250
(6)
11 ⁄ 8–
24or
1.12
5–
24U
NS
2A0.
0013
1.12
371.
1165
1.09
661.
0923
0.00
4282
1.07
412B
1.08
01.
090
1.09
791.
1035
0.00
561.
1250
(6)
11 ⁄ 4–
10or
1.25
0–
10U
NS
2A0.
0019
1.24
811.
2352
1.18
311.
1768
0.00
6271
1.12
902B
1.14
21.
163
1.18
501.
1932
0.00
821.
2500
(6)
11 ⁄ 4–
14or
1.25
0–
14U
NS
2A0.
0016
1.24
841.
2381
1.20
201.
1966
0.00
5401
1.16
332B
1.17
31.
188
1.20
361.
2106
0.00
701.
2500
11 ⁄ 4–
24or
1.25
0–
24U
NS
2A0.
0013
1.24
871.
2415
1.22
161.
2173
0.00
4338
1.19
912B
1.20
51.
215
1.22
291.
2285
0.00
561.
2500
(6)
13 ⁄ 8–
10or
1.37
5–
10U
NS
2A0.
0019
1.37
311.
3602
1.30
811.
3018
0.00
6323
1.25
402B
1.26
71.
288
1.31
001.
3182
0.00
821.
3750
(6)
13 ⁄ 8–
14or
1.37
5–
14U
NS
2A0.
0016
1.37
341.
3631
1.32
701.
3215
0.00
5453
1.28
832B
1.29
81.
313
1.32
861.
3357
0.00
711.
3750
137
标准下载网(www.bzxzw.com)
ASME B1.1-2003 NONMANDATORY APPENDIX D
Tabl
eD
-1Li
mit
sof
Size
for
Sele
cted
Com
bina
tion
sof
UN
S/U
NRS
Seri
esTh
read
s(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UN
RPi
tch
Dia
met
eran
dM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(3
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(3)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Max
.To
lera
nce
[Not
e(5
)]D
iam
eter
,Th
read
s/in
.na
tion
Clas
sA
llow
ance
[Not
e(2
)]M
in.
[Not
e(2
)]M
in.
[Not
e(4
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
(6)
13 ⁄ 8–
24or
1.37
5–
24U
NS
2A0.
0013
1.37
371.
3665
1.34
661.
3422
0.00
4390
1.32
412B
1.33
01.
340
1.34
791.
3536
0.00
571.
3750
(6)
11 ⁄ 2–
10or
1.50
0–
10U
NS
2A0.
0019
1.49
811.
4852
1.43
311.
4267
0.00
6372
1.37
902B
1.39
21.
413
1.43
501.
4433
0.00
831.
5000
(6)
11 ⁄ 2–
14or
1.50
0–
14U
NS
2A0.
0017
1.49
831.
4880
1.45
191.
4464
0.00
5502
1.41
322B
1.42
31.
438
1.45
361.
4608
0.00
721.
5000
11 ⁄ 2–
24or
1.50
0–
24U
NS
2A0.
0013
1.49
871.
4915
1.47
161.
4672
0.00
4439
1.44
912B
1.45
51.
465
1.47
291.
4787
0.00
581.
5000
(6)
15 ⁄ 8–
10or
1.62
5–
10U
NS
2A0.
0019
1.62
311.
6102
1.55
811.
5517
0.00
6419
1.50
402B
1.51
71.
538
1.56
001.
5683
0.00
831.
6250
(6)
15 ⁄ 8–
14or
1.62
5–
14U
NS
2A0.
0017
1.62
331.
6130
1.57
691.
5714
0.00
5549
1.53
822B
1.54
81.
563
1.57
861.
5858
0.00
721.
6250
(6)
15 ⁄ 8–
24or
1.62
5–
24U
NS
2A0.
0013
1.62
371.
6165
1.59
661.
5921
0.00
4486
1.57
412B
1.58
01.
590
1.59
791.
6037
0.00
581.
6250
(6)
13 ⁄ 4–
10or
1.75
0–
10U
NS
2A0.
0019
1.74
811.
7352
1.68
311.
6766
0.00
6463
1.62
902B
1.64
21.
663
1.68
501.
6934
0.00
841.
7500
13 ⁄ 4–
14or
1.75
0–
14U
NS
2A0.
0017
1.74
831.
7380
1.70
191.
6963
0.00
5593
1.66
322B
1.67
31.
688
1.70
361.
7109
0.00
731.
7500
(6)
13 ⁄ 4–
18or
1.75
0–
18U
NS
2A0.
0015
1.74
851.
7398
1.71
241.
7073
0.00
5053
1.68
232B
1.69
01.
703
1.71
391.
7205
0.00
661.
7500
(6)
17 ⁄ 8–
10or
1.87
5–
10U
NS
2A0.
0020
1.87
301.
8601
1.80
801.
8015
0.00
6505
1.75
392B
1.76
71.
788
1.81
001.
8185
0.00
851.
8750
(6)
17 ⁄ 8–
14or
1.87
5–
14U
NS
2A0.
0017
1.87
331.
8630
1.82
691.
8213
0.00
5635
1.78
822B
1.79
81.
813
1.82
861.
8359
0.00
731.
8750
(6)
17 ⁄ 8–
18or
1.87
5–
18U
NS
2A0.
0015
1.87
351.
8648
1.83
741.
8323
0.00
5095
1.80
732B
1.81
51.
828
1.83
891.
8455
0.00
661.
8750
(6)
2–
10or
2.00
0–
10U
NS
2A0.
0020
1.99
801.
9851
1.93
301.
9265
0.00
6545
1.87
892B
1.89
21.
913
1.93
501.
9435
0.00
852.
0000
(6)
2–
14or
2.00
0–
14U
NS
2A0.
0017
1.99
831.
9880
1.95
191.
9462
0.00
5675
1.91
322B
1.92
31.
938
1.95
361.
9610
0.00
742.
0000
(6)
2–
18or
2.00
0–
18U
NS
2A0.
0015
1.99
851.
9898
1.96
241.
9573
0.00
5135
1.93
232B
1.94
01.
953
1.96
391.
9706
0.00
672.
0000
(6)
21 ⁄ 16
–16
or2.
063
–16
UN
S2A
0.00
162.
0609
2.05
152.
0203
2.01
490.
0053
961.
9865
2B1.
995
2.00
92.
0219
2.02
890.
0070
2.06
25(6
)3A
0.00
002.
0625
2.05
312.
0219
2.01
790.
0040
001.
9881
3B1.
9950
2.00
342.
0219
2.02
720.
0053
2.06
25
(6)
23 ⁄ 16
–16
or2.
1875
–16
UN
S2A
0.00
162.
1859
2.17
652.
1453
2.13
990.
0054
342.
1115
2B2.
120
2.13
42.
1469
2.15
400.
0071
2.18
75(6
)3A
0.00
002.
1875
2.17
812.
1469
2.14
280.
0041
002.
1131
3B2.
1200
2.12
842.
1469
2.15
220.
0053
2.18
75
138
NONMANDATORY APPENDIX D ASME B1.1-2003
Tabl
eD
-1Li
mit
sof
Size
for
Sele
cted
Com
bina
tion
sof
UN
S/U
NRS
Seri
esTh
read
s(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UN
RPi
tch
Dia
met
eran
dM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(3
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(3)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Max
.To
lera
nce
[Not
e(5
)]D
iam
eter
,Th
read
s/in
.na
tion
Clas
sA
llow
ance
[Not
e(2
)]M
in.
[Not
e(2
)]M
in.
[Not
e(4
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
(6)
21 ⁄ 4–
10or
2.25
0–
10U
NS
2A00
202.
2480
2.23
512.
1830
2.17
640.
0066
212.
1289
2B2.
142
2.16
32.
1850
2.19
360.
0086
2.25
00
(6)
21 ⁄ 4–
14or
2.25
0–
14U
NS
2A0.
0017
2.24
832.
2380
2.20
192.
1961
0.00
5751
2.16
322B
2.17
32.
188
2.20
362.
2111
0.00
752.
2500
(6)
21 ⁄ 4–
18or
2.25
0–
18U
NS
2A0.
0016
2.24
842.
2397
2.21
232.
2071
0.00
5211
2.18
222B
2.19
02.
203
2.21
392.
2207
0.00
682.
2500
(6)
25 ⁄ 16
–16
or2.
3125
–16
UN
S2A
0.00
162.
3109
2.30
152.
2703
2.26
480.
0054
712.
2365
2B2.
245
2.25
92.
2719
2.27
900.
0071
2.31
25(6
)3A
0.00
002.
3125
2.30
312.
2719
2.26
780.
0041
002.
2381
3B2.
2450
2.25
342.
2719
2.27
720.
0053
2.31
25
(6)
27 ⁄ 16
–16
or2.
4375
–16
UN
S2A
0.00
172.
4358
2.42
642.
3952
2.38
970.
0055
062.
3614
2B2.
370
2.38
42.
3969
2.40
410.
0072
2.43
75(6
)3A
0.00
002.
4375
2.42
812.
3969
2.39
280.
0041
002.
3631
3B2.
3700
2.37
842.
3969
2.40
230.
0054
2.43
75
(6)
21 ⁄ 2–
10or
2.50
0–
10U
NS
2A0.
0020
2.49
802.
4851
2.43
302.
4263
0.00
6691
2.37
892B
2.39
22.
413
2.43
502.
4437
0.00
872.
5000
(6)
21 ⁄ 2–
14or
2.50
0–
14U
NS
2A0.
0017
2.49
832.
4880
2.45
192.
4461
0.00
5821
2.41
322B
2.42
32.
438
2.45
362.
4612
0.00
762.
5000
(6)
21 ⁄ 2–
18or
2.50
0–
18U
NS
2A0.
0016
2.49
842.
4897
2.46
232.
4570
0.00
5281
2.43
222B
2.44
02.
453
2.46
392.
4708
0.00
692.
5000
(6)
23 ⁄ 4–
10or
2.75
0–
10U
NS
2A0.
0020
2.74
802.
7351
2.68
302.
6762
0.00
6757
2.62
892B
2.64
22.
663
2.68
502.
6938
0.00
882.
7500
(6)
23 ⁄ 4–
14or
2.75
0–
14U
NS
2A0.
0018
2.74
822.
7379
2.70
182.
6959
0.00
5887
2.66
312B
2.67
32.
688
2.70
362.
7113
0.00
772.
7500
(6)
23 ⁄ 4–
18or
2.75
0–
18U
NS
2A0.
0016
2.74
842.
7397
2.71
232.
7070
0.00
5347
2.68
222B
2.69
02.
703
2.71
392.
7209
0.00
702.
7500
(6)
3–
10or
3.00
0–
10U
NS
2A0.
0020
2.99
802.
9851
2.93
302.
9262
0.00
6818
2.87
892B
2.89
22.
913
2.93
502.
9439
0.00
893.
0000
(6)
3–
14or
3.00
0–
14U
NS
2A0.
0018
2.99
822.
9879
2.95
182.
9459
0.00
5948
2.91
312B
2.92
32.
938
2.95
362.
9613
0.00
773.
0000
(6)
3–
18or
3.00
0–
18U
NS
2A0.
0016
2.99
842.
9897
2.96
232.
9569
0.00
5408
2.93
222B
2.94
02.
953
2.96
392.
9709
0.00
703.
0000
(6)
31 ⁄ 4–
10or
3.25
0–
10U
NS
2A0.
0021
3.24
793.
2350
3.18
293.
1760
0.00
6877
3.12
882B
3.14
23.
163
3.18
503.
1939
0.00
893.
2500
(6)
31 ⁄ 4–
14or
3.25
0–
14U
NS
2A0.
0018
3.24
823.
2379
3.20
183.
1958
0.00
6007
3.16
312B
3.17
33.
188
3.20
363.
2114
0.00
783.
2500
(6)
31 ⁄ 4–
18or
3.25
0–
18U
NS
2A0.
0016
3.24
843.
2397
3.21
233.
2068
0.00
5467
3.18
222B
3.19
03.
203
3.21
393.
2210
0.00
713.
2500
(6)
31 ⁄ 2–
10or
3.50
0–
10U
NS
2A0.
0021
3.49
793.
4850
3.43
293.
4260
0.00
6932
3.37
882B
3.39
23.
413
3.43
503.
4440
0.00
903.
5000
139
标准下载网(www.bzxzw.com)
ASME B1.1-2003 NONMANDATORY APPENDIX D
Tabl
eD
-1Li
mit
sof
Size
for
Sele
cted
Com
bina
tion
sof
UN
S/U
NRS
Seri
esTh
read
s(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UN
RPi
tch
Dia
met
eran
dM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(3
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(3)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Max
.To
lera
nce
[Not
e(5
)]D
iam
eter
,Th
read
s/in
.na
tion
Clas
sA
llow
ance
[Not
e(2
)]M
in.
[Not
e(2
)]M
in.
[Not
e(4
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
(6)
31 ⁄ 2–
14or
3.50
0–
14U
NS
2A0.
0018
3.49
823.
4879
3.45
183.
4457
0.00
6062
3.41
312B
3.42
33.
438
3.45
363.
4615
0.00
793.
5000
(6)
31 ⁄ 2–
18or
3.50
0–
18U
NS
2A0.
0017
3.49
833.
4896
3.46
223.
4567
0.00
5522
3.43
212B
3.44
03.
453
3.46
393.
4711
0.00
723.
5000
(6)
33 ⁄ 4–
10or
3.75
0–
10U
NS
2A0.
0021
3.74
793.
7350
3.68
293.
6759
0.00
6985
3.62
882B
3.64
23.
663
3.68
503.
6941
0.00
913.
7500
(6)
33 ⁄ 4–
14or
3.75
0–
14U
NS
2A0.
0018
3.74
823.
7379
3.70
183.
6957
0.00
6115
3.66
312B
3.67
33.
688
3.70
363.
7115
0.00
793.
7500
(6)
33 ⁄ 4–
18or
3.75
0–
18U
NS
2A0.
0017
3.74
833.
7396
3.71
223.
7066
0.00
5575
3.68
212B
3.69
03.
703
3.71
393.
7211
0.00
723.
7500
(6)
4–
10or
4.00
0–
10U
NS
2A0.
0021
3.99
793.
9850
3.93
293.
9259
0.00
7036
3.87
882B
3.89
23.
913
3.93
503.
9441
0.00
914.
0000
(6)
4–
14or
4.00
0–
14U
NS
2A0.
0018
3.99
823.
9879
3.95
183.
9456
0.00
6166
3.91
312B
3.92
33.
938
3.95
363.
9616
0.00
804.
0000
(6)
41 ⁄ 4–
10or
4.25
0–
10U
NS
2A0.
0021
4.24
794.
2350
4.18
294.
1758
0.00
7085
4.12
882B
4.14
24.
163
4.18
504.
1942
0.00
924.
2500
(6)
41 ⁄ 4–
14or
4.25
0–
14U
NS
2A0.
0019
4.24
814.
2378
4.20
174.
1955
0.00
6215
4.16
302B
4.17
34.
188
4.20
364.
2117
0.00
814.
2500
(6)
41 ⁄ 2–
10or
4.50
0–
10U
NS
2A0.
0021
4.49
794.
4850
4.43
294.
4258
0.00
7131
4.37
882B
4.39
24.
413
4.43
504.
4443
0.00
934.
5000
(6)
41 ⁄ 2–
14or
4.50
0–
14U
NS
2A0.
0019
4.49
814.
4878
4.45
174.
4454
0.00
6261
4.41
302B
4.42
34.
438
4.45
364.
4617
0.00
814.
5000
(6)
43 ⁄ 4–
10or
4.75
0–
10U
NS
2A0.
0022
4.74
784.
7349
4.68
284.
6756
0.00
7176
4.62
872B
4.64
24.
663
4.68
504.
6943
0.00
934.
7500
(6)
43 ⁄ 4–
14or
4.75
0–
14U
NS
2A0.
0019
4.74
814.
7378
4.70
174.
6954
0.00
6306
4.66
302B
4.67
34.
688
4.70
364.
7118
0.00
824.
7500
(6)
5–
10or
5.00
0–
10U
NS
2A0.
0022
4.99
784.
9849
4.93
284.
9256
0.00
7220
4.87
872B
4.89
24.
913
4.93
504.
9444
0.00
945.
0000
(6)
5–
14or
5.00
0–
14U
NS
2A0.
0019
4.99
814.
9878
4.95
174.
9454
0.00
6350
4.91
302B
4.92
34.
938
4.95
364.
9619
0.00
835.
0000
(6)
51 ⁄ 4–
10or
5.25
0–
10U
NS
2A0.
0022
5.24
785.
2349
5.18
285.
1755
0.00
7262
5.12
872B
5.14
25.
163
5.18
505.
1944
0.00
945.
2500
(6)
51 ⁄ 4–
14or
5.25
0–
14U
NS
2A0.
0019
5.24
815.
2378
5.20
175.
1953
0.00
6392
5.16
302B
5.17
35.
188
5.20
365.
2119
0.00
835.
2500
(6)
51 ⁄ 2–
10or
5.50
0–
10U
NS
2A0.
0022
5.49
785.
4849
5.43
285.
4255
0.00
7303
5.37
872B
5.39
25.
413
5.43
505.
4445
0.00
955.
5000
140
NONMANDATORY APPENDIX D ASME B1.1-2003
Tabl
eD
-1Li
mit
sof
Size
for
Sele
cted
Com
bina
tion
sof
UN
S/U
NRS
Seri
esTh
read
s(C
ont’
d)
Exte
rnal
[Not
e(1
)]In
tern
al[N
ote
(1)]
UN
RPi
tch
Dia
met
eran
dM
inor
Func
tion
alD
iam
eter
Pitc
hD
iam
eter
and
Dia
met
er,
Maj
orD
iam
eter
[Not
e(3
)]Fu
ncti
onal
Dia
met
erS
erie
sM
ax.
Maj
orM
inor
Dia
met
er[N
ote
(3)]
Nom
inal
Siz
ean
dD
esig
-M
ax.
Max
.To
lera
nce
[Not
e(5
)]D
iam
eter
,Th
read
s/in
.na
tion
Clas
sA
llow
ance
[Not
e(2
)]M
in.
[Not
e(2
)]M
in.
[Not
e(4
)](R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
(6)
51 ⁄ 2–
14or
5.50
0–
14U
NS
2A0.
0019
5.49
815.
4878
5.45
175.
4453
0.00
6433
5.41
302B
5.42
35.
438
5.45
365.
4620
0.00
845.
5000
(6)
53 ⁄ 4–
10or
5.75
0–
10U
NS
2A0.
0022
5.74
785.
7349
5.68
285.
6755
0.00
7342
5.62
872B
5.64
25.
663
5.68
505.
6945
0.00
955.
7500
(6)
53 ⁄ 4–
14or
5.75
0–
14U
NS
2A0.
0019
5.74
815.
7378
5.70
175.
6952
0.00
6472
5.66
302B
5.67
35.
688
5.70
365.
7120
0.00
845.
7500
(6)
6–
10or
6.00
0–
10U
NS
2A0.
0022
5.99
785.
9849
5.93
285.
9254
0.00
7381
5.87
872B
5.89
25.
913
5.93
505.
9446
0.00
966.
0000
(6)
6–
14or
6.00
0–
14U
NS
2A0.
0020
5.99
805.
9877
5.95
165.
9451
0.00
6511
5.91
292B
5.92
35.
938
5.95
365.
9621
0.00
856.
0000
GEN
ERA
LN
OTE
S:
Ser
ies
desi
gnat
ion
show
nin
dica
tes
the
UN
thre
adfo
rm;
how
ever
,th
eU
NR
thre
adfo
rmm
aybe
spec
ified
bysu
bsti
tuti
ngU
NR
inpl
ace
ofU
Nin
all
desi
gnat
ions
for
exte
rnal
use
only
.
NO
TES
:(1
)Th
read
clas
ses
may
beco
mbi
ned.
See
para
.4.
2.(2
)Fo
rCl
ass
2Ath
read
sha
ving
anad
diti
vefin
ish,
the
max
imum
maj
oran
dpi
tch
diam
eter
s,af
ter
coat
ing,
may
equa
lth
eba
sic
size
s,w
hose
valu
esar
eth
esa
me
asth
eno
min
alm
ajor
diam
eter
and
the
min
imum
pitc
hdi
amet
ersh
own
for
Clas
s2B
,re
spec
tive
ly.
See
para
.4.
1.2.
(3)
See
para
.5.
2.1
for
Func
tion
alD
iam
eter
.(4
)2A
pitc
hdi
amet
erto
lera
nce
(Td 2
)is
liste
dan
dus
edto
asi
xpl
ace
deci
mal
toca
lcul
ate
the
liste
dCl
ass
1A/1
B,
2B,
3A/
3Bto
lera
nces
and
Clas
s1A
/2A
allo
wan
ces
and
all
dim
ensi
onal
limit
sw
hich
depe
ndup
onth
em.
(5)
UN
seri
esex
tern
alth
read
max
imum
min
ordi
amet
eris
basi
c(D
1in
para
.11
)fo
rCl
ass
3Aan
dba
sic
min
usal
low
ance
for
Clas
ses
1Aan
d2A
.(6
)O
neor
mor
eof
the
num
bers
liste
din
this
row
have
been
chan
ged
toco
rrec
tfo
rca
lcul
atio
ner
rors
and
ach
ange
inro
undi
ngm
etho
ds.
The
orig
inal
num
bers
from
past
issu
esof
ASM
EB
1.1
are
liste
din
Non
man
dato
ryA
ppen
dix
Ean
dar
efo
rre
fere
nce
only
.
141
标准下载网(www.bzxzw.com)
ASME B1.1-2003 NONMANDATORY APPENDIX D
Table D-2 Major Diameter Tolerancesfor External Threads of Special
Diameters, Pitches, and Lengths ofEngagement (UNS/UNRS) — Classes
1A, 2A, and 3A
Major Diameter Tolerance
Class 2A andClass 1A Class 3AThreads/
in. 0.090 3�P2 0.060 3�P2
80 . . . 0.003272 . . . 0.003564 . . . 0.003856 . . . 0.0041
48 . . . 0.004544 . . . 0.004840 0.0077 0.005136 0.0083 0.0055
32 0.0089 0.006028 0.0098 0.006527 0.0100 0.006724 0.0108 0.0072
20 0.0122 0.008118 0.0131 0.008716 0.0142 0.009414 0.0155 0.0103
12 0.0172 0.011410 0.0194 0.0129
8 0.0225 0.01506 0.0273 0.01824 0.0357 0.0238
. . . . . . . . .
142
NONMANDATORY APPENDIX D ASME B1.1-2003
Table D-3 Allowances for External Threads of Special Diameters and Pitches(UNS/UNRS) — Classes 1A and 2A
Allowance based on basicmajor diameter of 0.0625 0.09375 0.125 0.1875 0.25 0.375 0.5 0.625 0.75 1 1.25 1.5
For diameter range above 0.0470 0.0781 0.1094 0.1562 0.2188 0.3125 0.4375 0.5625 0.6875 0.875 1.125 1.375
To and including 0.0781 0.1094 0.1562 0.2188 0.3125 0.4375 0.5625 0.6875 0.875 1.125 1.375 1.625
Threads/in. Major, Pitch, and Minor Diameter Allowances, in.
80 0.0006 0.0006 0.0006 0.0007 0.0007 . . . . . . . . . . . . . . . . . . . . .72 0.0006 0.0006 0.0006 0.0007 0.0007 0.0007 . . . . . . . . . . . . . . . . . .64 0.0006 0.0007 0.0007 0.0007 0.0007 0.0008 0.0008 . . . . . . . . . . . . . . .56 . . . 0.0007 0.0007 0.0007 0.0008 0.0008 0.0008 0.0009 0.0009 . . . . . . . . .48 . . . 0.0007 0.0008 0.0008 0.0008 0.0009 0.0009 0.0009 0.0009 . . . . . . . . .44 . . . 0.0008 0.0008 0.0008 0.0008 0.0009 0.0009 0.0009 0.0010 0.0010 . . . . . .40 . . . . . . 0.0008 0.0009 0.0009 0.0009 0.0010 0.0010 0.0010 0.0010 . . . . . .36 . . . . . . 0.0009 0.0009 0.0009 0.0010 0.0010 0.0010 0.0010 0.0011 0.0011 0.001232 . . . . . . 0.0009 0.0009 0.0010 0.0010 0.0010 0.0011 0.0011 0.0011 0.0012 0.001228 . . . . . . . . . 0.0010 0.0010 0.0011 0.0011 0.0011 0.0012 0.0012 0.0012 0.001327 . . . . . . . . . 0.0010 0.0010 0.0011 0.0011 0.0011 0.0012 0.0012 0.0012 0.001324 . . . . . . . . . 0.0011 0.0011 0.0011 0.0012 0.0012 0.0012 0.0013 0.0013 0.001320 . . . . . . . . . . . . 0.0012 0.0012 0.0013 0.0013 0.0013 0.0014 0.0014 0.001418 . . . . . . . . . . . . . . . 0.0013 0.0013 0.0014 0.0014 0.0014 0.0015 0.001516 . . . . . . . . . . . . . . . 0.0014 0.0014 0.0014 0.0015 0.0015 0.0015 0.001614 . . . . . . . . . . . . . . . . . . 0.0015 0.0015 0.0015 0.0016 0.0016 0.001712 . . . . . . . . . . . . . . . . . . 0.0016 0.0016 0.0017 0.0017 0.0017 0.001810 . . . . . . . . . . . . . . . . . . . . . . . . 0.0018 0.0018 0.0019 0.00198 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0021 0.0021 0.00216 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.00244 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Allowance based on basicmajor diameter of 1.75 2 2.5 3 3.5 4 5 6 8 10 12
For diameter range above 1.625 1.875 2.25 2.75 3.25 3.75 4.5 5.5 7 9 11
To and including 1.875 2.25 2.75 3.25 3.75 4.5 5.5 7 9 11 13
Threads/in. Major, Pitch, and Minor Diameter Allowances, in.
80 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 0.0012 0.0013 0.0013 0.0013 . . . . . . . . . . . . . . . . . . . . .28 0.0013 0.0013 0.0014 0.0014 0.0014 0.0015 . . . . . . . . . . . . . . .27 0.0013 0.0013 0.0014 0.0014 0.0014 0.0015 0.0015 0.0016 . . . . . . . . .24 0.0014 0.0014 0.0014 0.0015 0.0015 0.0015 0.0016 0.0016 . . . . . . . . .20 0.0015 0.0015 0.0015 0.0016 0.0016 0.0016 0.0017 0.0017 . . . . . . . . .18 0.0015 0.0015 0.0016 0.0016 0.0017 0.0017 0.0017 0.0018 0.0019 . . . . . .16 0.0016 0.0016 0.0017 0.0017 0.0017 0.0018 0.0018 0.0019 0.0019 0.0020 . . .14 0.0017 0.0017 0.0017 0.0018 0.0018 0.0018 0.0019 0.0020 0.0020 0.0021 0.002212 0.0018 0.0018 0.0019 0.0019 0.0019 0.0020 0.0020 0.0021 0.0021 0.0022 0.002310 0.0019 0.0020 0.0020 0.0020 0.0021 0.0021 0.0022 0.0022 0.0023 0.0024 0.0024
8 0.0021 0.0022 0.0022 0.0023 0.0023 0.0023 0.0024 0.0024 0.0025 0.0026 0.00266 0.0025 0.0025 0.0025 0.0026 0.0026 0.0026 0.0027 0.0027 0.0028 0.0029 0.00294 . . . 0.0030 0.0031 0.0031 0.0031 0.0032 0.0032 0.0033 0.0034 0.0034 0.0035
GENERAL NOTE: Classes 1A and 2A allowances are determined by multiplying Class 2A pitch diameter tolerances (com-puted to six decimal places) by 0.3 and are based on lengths of engagement of nine pitches.
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ASME B1.1-2003 NONMANDATORY APPENDIX D
Table D-4 Pitch Diameter Tolerances for External Threads of Special Diameters, Pitches, andLengths of Engagement (UNS/UNRS) — Class 1A
Tolerance based on basic major diameter of 0.0625 0.09375 0.125 0.1875 0.25 0.375 0.5 0.625 0.75 1
For diameter range above 0.0470 0.0781 0.1094 0.1562 0.2188 0.3125 0.4375 0.5625 0.6875 0.875
To and including 0.0781 0.1094 0.1562 0.2188 0.3125 0.4375 0.5625 0.6875 0.875 1.125
Length of Engagement
Threads/in. Number of Pitches in. Pitch Diameter Tolerances, in.
� 5 to 15 0.06 to 0.19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
16 to 30 0.191 to 0.38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 0.07 to 0.21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
16 to 30 0.211 to 0.42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 0.08 to 0.23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
16 to 30 0.231 to 0.46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 0.09 to 0.27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
16 to 30 0.271 to 0.54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 0.10 to 0.31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
16 to 30 0.311 to 0.62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 0.11 to 0.34 . . . 0.0038 0.0039 0.0041 0.0042 0.0044 0.0046 0.0047 0.0049 0.005144
16 to 30 0.341 to 0.68 . . . 0.0048 0.0049 0.0051 0.0053 0.0056 0.0058 0.0059 0.0061 0.0063
� 5 to 15 0.12 to 0.38 . . . . . . 0.0041 0.0043 0.0044 0.0046 0.0048 0.0049 0.0050 0.005240
16 to 30 0.381 to 0.76 . . . . . . 0.0051 0.0053 0.0055 0.0058 0.0060 0.0061 0.0063 0.0066
� 5 to 15 0.14 to 0.42 . . . . . . 0.0043 0.0045 0.0046 0.0048 0.0050 0.0051 0.0052 0.005436
16 to 30 0.421 to 0.84 . . . . . . 0.0054 0.0056 0.0058 0.0060 0.0062 0.0064 0.0065 0.0068
� 5 to 15 0.16 to 0.47 . . . . . . 0.0045 0.0047 0.0048 0.0050 0.0052 0.0053 0.0055 0.005732
16 to 30 0.471 to 0.94 . . . . . . 0.0057 0.0059 0.0061 0.0063 0.0065 0.0067 0.0068 0.0071
� 5 to 15 0.18 to 0.54 . . . . . . . . . 0.0050 0.0051 0.0053 0.0055 0.0056 0.0058 0.006028
16 to 30 0.541 to 1.08 . . . . . . . . . 0.0063 0.0064 0.0067 0.0069 0.0070 0.0072 0.0075
� 5 to 15 0.19 to 0.56 . . . . . . . . . 0.0051 0.0052 0.0056 0.0056 0.0057 0.0058 0.006027
16 to 30 0.561 to 1.12 . . . . . . . . . 0.0064 0.0065 0.0068 0.0070 0.0072 0.0073 0.0076
� 5 to 15 0.21 to 0.62 . . . . . . . . . 0.0054 0.0055 0.0057 0.0059 0.0060 0.0061 0.006324
16 to 30 0.621 to 1.24 . . . . . . . . . 0.0067 0.0069 0.0071 0.0073 0.0075 0.0077 0.0079
� 5 to 15 0.25 to 0.75 . . . . . . . . . . . . 0.0060 0.0062 0.0063 0.0065 0.0066 0.006820
16 to 30 0.751 to 1.50 . . . . . . . . . . . . 0.0075 0.0077 0.0079 0.0081 0.0083 0.0085
� 5 to 15 0.28 to 0.83 . . . . . . . . . . . . . . . 0.0065 0.0067 0.0068 0.0069 0.007118
16 to 30 0.831 to 1.66 . . . . . . . . . . . . . . . 0.0081 0.0083 0.0085 0.0086 0.0089
� 5 to 15 0.31 to 0.94 . . . . . . . . . . . . . . . 0.0069 0.0070 0.0072 0.0073 0.007516
16 to 30 0.941 to 1.88 . . . . . . . . . . . . . . . 0.0086 0.0088 0.0089 0.0091 0.0094
� 5 to 15 0.36 to 1.07 . . . . . . . . . . . . . . . . . . 0.0075 0.0076 0.0077 0.007914
16 to 30 1.071 to 2.14 . . . . . . . . . . . . . . . . . . 0.0093 0.0095 0.0097 0.0099
� 5 to 15 0.42 to 1.25 . . . . . . . . . . . . . . . . . . 0.0080 0.0082 0.0083 0.008512
16 to 30 1.251 to 2.50 . . . . . . . . . . . . . . . . . . 0.0100 0.0102 0.0104 0.0106
� 5 to 15 0.50 to 1.50 . . . . . . . . . . . . . . . . . . . . . . . . 0.0090 0.009210
16 to 30 1.501 to 3.00 . . . . . . . . . . . . . . . . . . . . . . . . 0.0113 0.0115
� 5 to 15 0.62 to 1.88 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01038
16 to 30 1.881 to 3.76 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0128
� 5 to 15 0.83 to 2.50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
16 to 30 2.501 to 5.00 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 1.25 to 3.75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 16 to 30 3.751 to 7.50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL NOTES:(a) These values do not agree with and shall not be used in place of any tabulated values for the UNC, UNF, and 4-UN,
6-UN, and 8-UN thread series.
(b) Class 1A tolerances in this Table for 5 to 15 pitches are based on 9 pitches and are obtained by multiplying the Class2A (external thread) tolerances for 9 pitches taken to six decimal places (see Table 20) by a factor of 1.5.
(c) Class 1A tolerances in this Table for 16 to 30 pitches are obtained by multiplying the Class 2A (external thread) toler-ances for 9 pitches taken to six decimal places by a factor of 1.875 (obtained by multiplying the 1.5 factor by 1.25).For lengths of engagement not tabulated, see para. 5.
144
NONMANDATORY APPENDIX D ASME B1.1-2003
Table D-4 Pitch Diameter Tolerances for External Threads of Special Diameters, Pitches, andLengths of Engagement (UNS/UNRS) — Class 1A
1.25 1.5 1.75 2 2.5 3 3.5 4 5 6 8 10 12
1.125 1.375 1.625 1.875 2.25 2.75 3.25 3.75 4.5 5.5 7 9 11
1.375 1.625 1.875 2.25 2.75 3.25 3.75 4.5 5.5 7 9 11 13
Pitch Diameter Tolerances, in. Threads/in.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 80
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 72
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 64
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 56
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 48
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 44
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 40
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.0056 0.0058 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 360.0070 0.0072 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.0058 0.0060 0.0061 0.0063 0.0065 0.0067 . . . . . . . . . . . . . . . . . . . . . � 320.0073 0.0075 0.0077 0.0078 0.0081 0.0083 . . . . . . . . . . . . . . . . . . . . .
0.0061 0.0063 0.0064 0.0066 0.0068 0.0070 0.0071 0.0073 . . . . . . . . . . . . . . . � 280.0077 0.0079 0.0080 0.0082 0.0085 0.0087 0.0089 0.0091 . . . . . . . . . . . . . . .
0.0061 0.0064 0.0065 0.0066 0.0069 0.0070 0.0072 0.0074 0.0076 0.0079 . . . . . . . . . � 270.0078 0.0080 0.0081 0.0083 0.0086 0.0088 0.0090 0.0092 0.0096 0.0099 . . . . . . . . .
0.0065 0.0067 0.0068 0.0069 0.0071 0.0073 0.0075 0.0077 0.0079 0.0082 . . . . . . . . . � 240.0081 0.0083 0.0085 0.0086 0.0089 0.0092 0.0094 0.0096 0.0099 0.0102 . . . . . . . . .
0.0070 0.0071 0.0073 0.0074 0.0076 0.0078 0.0080 0.0081 0.0084 0.0087 . . . . . . . . . � 200.0087 0.0089 0.0091 0.0092 0.0095 0.0098 0.0100 0.0102 0.0105 0.0108 . . . . . . . . .
0.0073 0.0074 0.0076 0.0077 0.0079 0.0081 0.0083 0.0084 0.0087 0.0090 0.0094 . . . . . . � 180.0091 0.0093 0.0095 0.0096 0.0099 0.0101 0.0104 0.0105 0.0109 0.0112 0.0117 . . . . . .
0.0077 0.0078 0.0078 0.0081 0.0083 0.0085 0.0086 0.0088 0.0091 0.0093 0.0097 0.0101 . . . � 160.0096 0.0098 0.0099 0.0101 0.0104 0.0106 0.0108 0.0110 0.0113 0.0116 0.0122 0.0126 . . .
0.0081 0.0083 0.0084 0.0085 0.0087 0.0089 0.0091 0.0092 0.0095 0.0098 0.0102 0.0105 0.0108 � 140.0101 0.0103 0.0105 0.0106 0.0109 0.0112 0.0114 0.0116 0.0119 0.0122 0.0127 0.0132 0.0135
0.0087 0.0088 0.0090 0.0091 0.0093 0.0095 0.0097 0.0098 0.0101 0.0103 0.0107 0.0111 0.0114 � 120.0108 0.0110 0.0112 0.0113 0.0116 0.0119 0.0121 0.0123 0.0126 0.0129 0.0134 0.0139 0.0142
0.0094 0.0096 0.0097 0.0098 0.0100 0.0102 0.0104 0.0106 0.0108 0.0111 0.0115 0.0118 0.0121 � 100.0118 0.0119 0.0121 0.0123 0.0125 0.0128 0.0130 0.0132 0.0135 0.0138 0.0144 0.0148 0.0152
0.0104 0.0106 0.0107 0.0108 0.0111 0.0113 0.0114 0.0116 0.0119 0.0121 0.0125 0.0129 0.0132 � 80.0130 0.0132 0.0134 0.0136 0.0138 0.0141 0.0143 0.0145 0.0148 0.0151 0.0156 0.0161 0.0165
. . . 0.0121 0.0123 0.0124 0.0126 0.0128 0.0130 0.0131 0.0134 0.0137 0.0141 0.0144 0.0147 � 6
. . . 0.0152 0.0154 0.0155 0.0158 0.0160 0.0162 0.0164 0.0168 0.0171 0.0176 0.0180 0.0184
. . . . . . . . . 0.0151 0.0154 0.0155 0.0157 0.0159 0.0162 0.0164 0.0168 0.0172 0.0175 � 4
. . . . . . . . . 0.0189 0.0192 0.0194 0.0196 0.0198 0.0202 0.0205 0.0210 0.0214 0.0214
(d) Pitches listed are those used most commonly and are recommended. Where intermediate pitches are specified, the for-mula in para. 5 should be applied.
(e) Tolerances are tabulated only for combinations of diameter, pitch, and length of engagement that are considered to begenerally used. For other combinations encountered, see para. 5.
145
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ASME B1.1-2003 NONMANDATORY APPENDIX D
Table D-5 Pitch Diameter Tolerances for External Threads of Special Diameters, Pitches, andLengths of Engagement (UNS/UNRS) — Class 2A
Tolerance based on basic major diameter of 0.0625 0.09375 0.125 0.1875 0.25 0.375 0.5 0.625 0.75 1
For diameter range above 0.0470 0.0781 0.1094 0.1562 0.2188 0.3125 0.4375 0.5625 0.6875 0.875
To and including 0.0781 0.1094 0.1562 0.2188 0.3125 0.4375 0.5625 0.6875 0.875 1.125
Length of Engagement
Threads/in. Number of Pitches in. Pitch Diameter Tolerances, in.
� 5 to 15 0.06 to 0.19 0.0019 0.0020 0.0021 0.0022 0.0023 . . . . . . . . . . . . . . .80
16 to 30 0.191 to 0.38 0.0024 0.0025 0.0026 0.0027 0.0028 . . . . . . . . . . . . . . .
� 5 to 15 0.07 to 0.21 0.0020 0.0021 0.0021 0.0023 0.0023 0.0025 . . . . . . . . . . . .72
16 to 30 0.211 to 0.42 0.0025 0.0026 0.0027 0.0028 0.0029 0.0031 . . . . . . . . . . . .
� 5 to 15 0.08 to 0.23 0.0021 0.0022 0.0022 0.0024 0.0024 0.0026 0.0027 . . . . . . . . .64
16 to 30 0.231 to 0.46 0.0026 0.0027 0.0028 0.0029 0.0031 0.0032 0.0034 . . . . . . . . .
� 5 to 15 0.09 to 0.27 . . . 0.0023 0.0024 0.0025 0.0026 0.0027 0.0028 0.0029 0.0030 . . .56
16 to 30 0.271 to 0.54 . . . 0.0029 0.0030 0.0031 0.0032 0.0034 0.0035 0.0036 0.0037 . . .
� 5 to 15 0.10 to 0.31 . . . 0.0025 0.0025 0.0026 0.0027 0.0029 0.0030 0.0031 0.0031 . . .48
16 to 30 0.311 to 0.62 . . . 0.0031 0.0032 0.0033 0.0034 0.0036 0.0037 0.0038 0.0039 . . .
� 5 to 15 0.11 to 0.34 . . . 0.0026 0.0026 0.0027 0.0028 0.0030 0.0031 0.0032 0.0032 0.003444
16 to 30 0.341 to 0.68 . . . 0.0032 0.0033 0.0034 0.0035 0.0037 0.0038 0.0040 0.0041 0.0042
� 5 to 15 0.12 to 0.38 . . . . . . 0.0027 0.0029 0.0029 0.0031 0.0032 0.0033 0.0034 0.003540
16 to 30 0.381 to 0.76 . . . . . . 0.0034 0.0036 0.0037 0.0038 0.0040 0.0041 0.0042 0.0044
� 5 to 15 0.14 to 0.42 . . . . . . 0.0029 0.0030 0.0031 0.0032 0.0033 0.0034 0.0035 0.003636
16 to 30 0.421 to 0.84 . . . . . . 0.0036 0.0037 0.0038 0.0040 0.0041 0.0043 0.0044 0.0045
� 5 to 15 0.16 to 0.47 . . . . . . 0.0030 0.0031 0.0032 0.0034 0.0035 0.0036 0.0036 0.003832
16 to 30 0.471 to 0.94 . . . . . . 0.0038 0.0039 0.0040 0.0042 0.0043 0.0045 0.0046 0.0047
� 5 to 15 0.18 to 0.54 . . . . . . . . . 0.0033 0.0034 0.0036 0.0037 0.0038 0.0038 0.004028
16 to 30 0.541 to 1.08 . . . . . . . . . 0.0042 0.0043 0.0044 0.0046 0.0047 0.0048 0.0050
� 5 to 15 0.19 to 0.56 . . . . . . . . . 0.0034 0.0035 0.0036 0.0037 0.0038 0.0039 0.004027
16 to 30 0.561 to 1.12 . . . . . . . . . 0.0042 0.0043 0.0045 0.0047 0.0048 0.0049 0.0050
� 5 to 15 0.21 to 0.62 . . . . . . . . . 0.0036 0.0037 0.0038 0.0039 0.0040 0.0041 0.004224
16 to 30 0.621 to 1.24 . . . . . . . . . 0.0045 0.0046 0.0048 0.0049 0.0050 0.0051 0.0053
� 5 to 15 0.25 to 0.75 . . . . . . . . . . . . 0.0040 0.0041 0.0042 0.0043 0.0044 0.004520
16 to 30 0.751 to 1.50 . . . . . . . . . . . . 0.0050 0.0052 0.0053 0.0054 0.0055 0.0057
� 5 to 15 0.28 to 0.83 . . . . . . . . . . . . . . . 0.0043 0.0044 0.0045 0.0046 0.004718
16 to 30 0.831 to 1.66 . . . . . . . . . . . . . . . 0.0054 0.0055 0.0057 0.0058 0.0059
� 5 to 15 0.31 to 0.94 . . . . . . . . . . . . . . . 0.0046 0.0047 0.0048 0.0049 0.005016
16 to 30 0.941 to 1.88 . . . . . . . . . . . . . . . 0.0057 0.0058 0.0060 0.0061 0.0062
� 5 to 15 0.36 to 1.07 . . . . . . . . . . . . . . . . . . 0.0050 0.0051 0.0051 0.005314
16 to 30 1.071 to 2.14 . . . . . . . . . . . . . . . . . . 0.0062 0.0063 0.0064 0.0066
� 5 to 15 0.42 to 1.25 . . . . . . . . . . . . . . . . . . 0.0054 0.0054 0.0055 0.005712
16 to 30 1.251 to 2.50 . . . . . . . . . . . . . . . . . . 0.0067 0.0068 0.0069 0.0071
� 5 to 15 0.50 to 1.50 . . . . . . . . . . . . . . . . . . . . . . . . 0.0060 0.006210
16 to 30 1.501 to 3.00 . . . . . . . . . . . . . . . . . . . . . . . . 0.0075 0.0077
� 5 to 15 0.62 to 1.88 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.00688
16 to 30 1.881 to 3.76 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0086
� 5 to 15 0.83 to 2.50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
16 to 30 2.501 to 5.00 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 1.25 to 3.75 . . . . . . . . . . . . . . . . . . . . . . . . . . .4
16 to 30 3.751 to 7.50 . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL NOTES:(a) These values do not agree with and shall not be used in place of any tabulated values for the UNC, UNF, and 4-UN,
6-UN, and 8-UN thread series.(b) Formula:
Class 2A tolerances p 0.0015 3�D + 0.0015 �LE + 0.015 3�P2, whereD p basic major diameterLE p length of engagementP p pitch
146
NONMANDATORY APPENDIX D ASME B1.1-2003
Table D-5 Pitch Diameter Tolerances for External Threads of Special Diameters, Pitches, andLengths of Engagement (UNS/UNRS) — Class 2A
1.25 1.5 1.75 2 2.5 3 3.5 4 5 6 8 10 12
1.125 1.375 1.625 1.875 2.25 2.75 3.25 3.75 4.5 5.5 7 9 11
1.375 1.625 1.875 2.25 2.75 3.25 3.75 4.5 5.5 7 9 11 13
Pitch Diameter Tolerances, in. Threads/in.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 80
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 72
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 64
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 56
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 48
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 44
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 40
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.0037 0.0038 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 360.0047 0.0048 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.0039 0.0040 0.0041 0.0042 0.0043 0.0044 . . . . . . . . . . . . . . . . . . . . . � 320.0049 0.0050 0.0051 0.0052 0.0054 0.0056 . . . . . . . . . . . . . . . . . . . . .
0.0041 0.0042 0.0043 0.0044 0.0045 0.0046 0.0048 0.0049 . . . . . . . . . . . . . . . � 280.0051 0.0052 0.0054 0.0055 0.0056 0.0058 0.0059 0.0061 . . . . . . . . . . . . . . .
0.0041 0.0042 0.0043 0.0044 0.0046 0.0047 0.0048 0.0049 0.0051 0.0053 . . . . . . . . . � 270.0052 0.0053 0.0054 0.0055 0.0057 0.0059 0.0060 0.0061 0.0064 0.0066 . . . . . . . . .
0.0043 0.0044 0.0045 0.0046 0.0048 0.0049 0.0050 0.0051 0.0053 0.0054 . . . . . . . . . � 240.0054 0.0055 0.0057 0.0058 0.0059 0.0061 0.0062 0.0064 0.0066 0.0068 . . . . . . . . .
0.0047 0.0048 0.0048 0.0049 0.0051 0.0052 0.0053 0.0054 0.0056 0.0058 . . . . . . . . . � 200.0058 0.0059 0.0061 0.0062 0.0063 0.0065 0.0066 0.0068 0.0070 0.0072 . . . . . . . . .
0.0049 0.0050 0.0051 0.0051 0.0053 0.0054 0.0055 0.0056 0.0058 0.0060 0.0062 . . . . . . � 180.0061 0.0062 0.0063 0.0064 0.0066 0.0068 0.0069 0.0070 0.0073 0.0075 0.0078 . . . . . .
0.0051 0.0052 0.0053 0.0054 0.0055 0.0056 0.0058 0.0059 0.0061 0.0062 0.0065 0.0067 . . . � 160.0064 0.0065 0.0066 0.0067 0.0069 0.0071 0.0072 0.0073 0.0076 0.0078 0.0081 0.0084 . . .
0.0054 0.0055 0.0056 0.0057 0.0058 0.0059 0.0061 0.0062 0.0064 0.0065 0.0068 0.0070 0.0072 � 140.0068 0.0069 0.0070 0.0071 0.0073 0.0074 0.0076 0.0077 0.0079 0.0081 0.0085 0.0088 0.0090
0.0058 0.0059 0.0060 0.0061 0.0062 0.0063 0.0064 0.0065 0.0067 0.0069 0.0072 0.0074 0.0076 � 120.0072 0.0073 0.0075 0.0076 0.0077 0.0079 0.0080 0.0082 0.0084 0.0086 0.0090 0.0092 0.0095
0.0063 0.0064 0.0065 0.0065 0.0067 0.0068 0.0069 0.0070 0.0072 0.0074 0.0077 0.0079 0.0081 � 100.0078 0.0080 0.0081 0.0082 0.0084 0.0085 0.0087 0.0088 0.0090 0.0092 0.0096 0.0099 0.0101
0.0070 0.0071 0.0071 0.0072 0.0074 0.0075 0.0076 0.0077 0.0079 0.0081 0.0083 0.0086 0.0088 � 80.0087 0.0088 0.0089 0.0090 0.0092 0.0094 0.0095 0.0097 0.0099 0.0101 0.0104 0.0107 0.0110
. . . 0.0081 0.0082 0.0083 0.0084 0.0085 0.0087 0.0088 0.0089 0.0091 0.0094 0.0096 0.0098 � 6
. . . 0.0101 0.0102 0.0103 0.0105 0.0107 0.0108 0.0110 0.0112 0.0114 0.0117 0.0120 0.0123
. . . . . . . . . 0.0101 0.0102 0.0104 0.0105 0.0106 0.0108 0.0109 0.0112 0.0114 0.0116 � 4
. . . . . . . . . 0.0126 0.0128 0.0130 0.0131 0.0132 0.0135 0.0137 0.0140 0.0143 0.0145
(c) Length of engagement increments included in the tabulated tolerances for length of engagement of from 5 to 15pitches are based on lengths of 9 pitches; those for lengths of engagement of from 16 to 30 pitches are obtained bymultiplying the 9 pitch values taken to six decimal places by 1.25. For lengths of engagement not tabulated, the for-mula in (b) above should be applied except as modified.
(d) Pitches listed are those used most commonly and are recommended. When intermediate pitches are specified, the for-mula in (b) above should be applied.
(e) Tolerances are tabulated only for combinations of diameter, pitch, and length of engagement that are considered to begenerally used. For other combinations encountered, see para. 5.
147
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ASME B1.1-2003 NONMANDATORY APPENDIX D
Table D-6 Pitch Diameter Tolerances for External Threads of Special Diameters, Pitches, andLengths of Engagement (UNS/UNRS) — Class 3A
Tolerance based on basic major diameter of 0.0625 0.09375 0.125 0.1875 0.25 0.375 0.5 0.625 0.75 1
For diameter range above 0.0470 0.0781 0.1094 0.1562 0.2188 0.3125 0.4375 0.5625 0.6875 0.875
To and including 0.0781 0.1094 0.1562 0.2188 0.3125 0.4375 0.5625 0.6875 0.875 1.125
Length of Engagement
Threads/in. Number of Pitches in. Pitch Diameter Tolerances, in.
� 5 to 15 0.06 to 0.19 0.0014 0.0015 0.0015 0.0016 0.0017 . . . . . . . . . . . . . . .80
16 to 30 0.191 to 0.38 0.0018 0.0019 0.0019 0.0020 0.0021 . . . . . . . . . . . . . . .
� 5 to 15 0.07 to 0.21 0.0015 0.0016 0.0016 0.0017 0.0018 0.0019 . . . . . . . . . . . .72
16 to 30 0.211 to 0.42 0.0019 0.0019 0.0020 0.0021 0.0022 0.0023 . . . . . . . . . . . .
� 5 to 15 0.08 to 0.23 0.0016 0.0016 0.0017 0.0018 0.0018 0.0019 0.0020 . . . . . . . . .64
16 to 30 0.231 to 0.46 0.0020 0.0020 0.0021 0.0022 0.0023 0.0024 0.0025 . . . . . . . . .
� 5 to 15 0.09 to 0.27 . . . 0.0017 0.0018 0.0019 0.0019 0.0020 0.0021 0.0022 0.0022 . . .56
16 to 30 0.271 to 0.54 . . . 0.0022 0.0022 0.0023 0.0024 0.0025 0.0026 0.0027 0.0028 . . .
� 5 to 15 0.10 to 0.31 . . . 0.0019 0.0019 0.0019 0.0020 0.0020 0.0022 0.0023 0.0024 . . .48
16 to 30 0.311 to 0.62 . . . 0.0022 0.0023 0.0024 0.0025 0.0026 0.0027 0.0029 0.0030 . . .
� 5 to 15 0.11 to 0.34 . . . 0.0019 0.0020 0.0021 0.0021 0.0022 0.0023 0.0024 0.0024 0.002544
16 to 30 0.341 to 0.68 . . . 0.0024 0.0025 0.0026 0.0026 0.0028 0.0029 0.0030 0.0030 0.0032
� 5 to 15 0.12 to 0.38 . . . . . . 0.0021 0.0021 0.0022 0.0023 0.0024 0.0025 0.0025 0.002640
16 to 30 0.381 to 0.76 . . . . . . 0.0026 0.0027 0.0028 0.0029 0.0030 0.0031 0.0031 0.0033
� 5 to 15 0.14 to 0.42 . . . . . . 0.0022 0.0022 0.0023 0.0024 0.0025 0.0026 0.0026 0.002736
16 to 30 0.421 to 0.84 . . . . . . 0.0027 0.0028 0.0029 0.0030 0.0031 0.0032 0.0033 0.0034
� 5 to 15 0.16 to 0.47 . . . . . . 0.0023 0.0024 0.0024 0.0025 0.0026 0.0027 0.0027 0.002832
16 to 30 0.471 to 0.94 . . . . . . 0.0028 0.0029 0.0030 0.0032 0.0033 0.0033 0.0034 0.0035
� 5 to 15 0.18 to 0.54 . . . . . . . . . 0.0025 0.0026 0.0027 0.0028 0.0028 0.0029 0.003028
16 to 30 0.541 to 1.08 . . . . . . . . . 0.0031 0.0032 0.0033 0.0034 0.0035 0.0036 0.0037
� 5 to 15 0.19 to 0.56 . . . . . . . . . 0.0025 0.0026 0.0027 0.0028 0.0029 0.0029 0.003027
16 to 30 0.561 to 1.12 . . . . . . . . . 0.0032 0.0033 0.0034 0.0035 0.0036 0.0037 0.0038
� 5 to 15 0.21 to 0.62 . . . . . . . . . 0.0027 0.0028 0.0029 0.0029 0.0030 0.0031 0.003224
16 to 30 0.621 to 1.24 . . . . . . . . . 0.0034 0.0034 0.0036 0.0037 0.0038 0.0038 0.0040
� 5 to 15 0.25 to 0.75 . . . . . . . . . . . . 0.0030 0.0031 0.0032 0.0032 0.0033 0.003420
16 to 30 0.751 to 1.50 . . . . . . . . . . . . 0.0037 0.0039 0.0040 0.0041 0.0041 0.0043
� 5 to 15 0.28 to 0.83 . . . . . . . . . . . . . . . 0.0032 0.0033 0.0034 0.0035 0.003618
16 to 30 0.831 to 1.66 . . . . . . . . . . . . . . . 0.0041 0.0042 0.0042 0.0043 0.0044
� 5 to 15 0.31 to 0.94 . . . . . . . . . . . . . . . 0.0034 0.0035 0.0036 0.0036 0.003716
16 to 30 0.941 to 1.88 . . . . . . . . . . . . . . . 0.0043 0.0044 0.0045 0.0045 0.0047
� 5 to 15 0.36 to 1.07 . . . . . . . . . . . . . . . . . . 0.0037 0.0038 0.0039 0.004014
16 to 30 1.071 to 2.14 . . . . . . . . . . . . . . . . . . 0.0047 0.0048 0.0048 0.0050
� 5 to 15 0.42 to 1.25 . . . . . . . . . . . . . . . . . . 0.0040 0.0041 0.0041 0.004212
16 to 30 1.251 to 2.50 . . . . . . . . . . . . . . . . . . 0.0050 0.0051 0.0052 0.0053
� 5 to 15 0.50 to 1.50 . . . . . . . . . . . . . . . . . . . . . . . . 0.0045 0.004610
16 to 30 1.501 to 3.00 . . . . . . . . . . . . . . . . . . . . . . . . 0.0056 0.0058
� 5 to 15 0.62 to 1.88 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.00518
16 to 30 1.881 to 3.76 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0064
� 5 to 15 0.83 to 2.50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
16 to 30 2.501 to 5.00 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 1.25 to 3.75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
16 to 30 3.751 to 7.50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL NOTES:(a) These values do not agree with and shall not be used in place of any tabulated values for the UNC, UNF, and 4-UN,
6-UN, and 8-UN thread series.(b) Class 3A tolerances in this Table for 5 to 15 pitches are based on 9 pitches and are obtained by multiplying the Class
2A (external thread) tolerances for 9 pitches taken to six decimal places by a factor 0f 0.75.(c) Class 3A tolerances in this Table for 16 to 30 pitches are obtained by multiplying the Class 2A (external thread) toler-
ances for 9 pitches taken to six decimal places by a factor of 0.9375 (obtained by multiplying the 0.75 factor by 1.25).For lengths of engagement not tabulated, see para. 5.
148
NONMANDATORY APPENDIX D ASME B1.1-2003
Table D-6 Pitch Diameter Tolerances for External Threads of Special Diameters, Pitches, andLengths of Engagement (UNS/UNRS) — Class 3A
1.25 1.5 1.75 2 2.5 3 3.5 4 5 6 8 10 12
1.125 1.375 1.625 1.875 2.25 2.75 3.25 3.75 4.5 5.5 7 9 11
1.375 1.625 1.875 2.25 2.75 3.25 3.75 4.5 5.5 7 9 11 13
Pitch Diameter Tolerances, in. Threads/in.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 80
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 72
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 64
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 56
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 48
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 44
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 40
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.0028 0.0029 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 360.0035 0.0036 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.0029 0.0030 0.0031 0.0031 0.0032 0.0033 . . . . . . . . . . . . . . . . . . . . . � 320.0037 0.0038 0.0038 0.0039 0.0040 0.0042 . . . . . . . . . . . . . . . . . . . . .
0.0031 0.0031 0.0032 0.0033 0.0034 0.0035 0.0036 0.0036 . . . . . . . . . . . . . . . � 280.0038 0.0039 0.0040 0.0041 0.0042 0.0044 0.0045 0.0046 . . . . . . . . . . . . . . .
0.0031 0.0032 0.0033 0.0033 0.0034 0.0035 0.0036 0.0037 0.0038 0.0039 . . . . . . . . . � 270.0039 0.0040 0.0041 0.0041 0.0043 0.0044 0.0045 0.0046 0.0048 0.0049 . . . . . . . . .
0.0033 0.0033 0.0034 0.0035 0.0036 0.0037 0.0037 0.0038 0.0040 0.0041 . . . . . . . . . � 240.0041 0.0042 0.0042 0.0043 0.0045 0.0046 0.0047 0.0048 0.0050 0.0051 . . . . . . . . .
0.0035 0.0036 0.0036 0.0037 0.0038 0.0039 0.0040 0.0041 0.0042 0.0043 . . . . . . . . . � 200.0044 0.0045 0.0045 0.0046 0.0048 0.0049 0.0050 0.0051 0.0053 0.0054 . . . . . . . . .
0.0036 0.0037 0.0038 0.0039 0.0040 0.0041 0.0041 0.0042 0.0044 0.0045 0.0047 . . . . . . � 180.0046 0.0047 0.0047 0.0048 0.0050 0.0051 0.0052 0.0053 0.0054 0.0056 0.0059 . . . . . .
0.0038 0.0039 0.0040 0.0040 0.0041 0.0042 0.0043 0.0045 0.0045 0.0047 0.0049 0.0050 . . . � 160.0048 0.0049 0.0050 0.0050 0.0052 0.0053 0.0054 0.0055 0.0057 0.0058 0.0061 0.0063 . . .
0.0041 0.0041 0.0042 0.0043 0.0044 0.0045 0.0045 0.0046 0.0048 0.0049 0.0051 0.0053 0.0054 � 140.0051 0.0052 0.0052 0.0053 0.0055 0.0056 0.0057 0.0058 0.0060 0.0061 0.0064 0.0066 0.0068
0.0043 0.0044 0.0045 0.0045 0.0046 0.0047 0.0048 0.0049 0.0050 0.0052 0.0054 0.0055 0.0057 � 120.0054 0.0055 0.0056 0.0057 0.0058 0.0059 0.0060 0.0061 0.0063 0.0065 0.0067 0.0069 0.0071
0.0047 0.0048 0.0048 0.0049 0.0050 0.0051 0.0052 0.0053 0.0054 0.0055 0.0057 0.0059 0.0061 � 100.0059 0.0060 0.0061 0.0061 0.0063 0.0064 0.0065 0.0066 0.0068 0.0069 0.0072 0.0074 0.0076
0.0052 0.0053 0.0054 0.0054 0.0055 0.0056 0.0057 0.0058 0.0059 0.0061 0.0063 0.0064 0.0066 � 80.0065 0.0066 0.0067 0.0068 0.0069 0.0070 0.0071 0.0072 0.0074 0.0076 0.0078 0.0080 0.0082
. . . 0.0061 0.0061 0.0062 0.0063 0.0064 0.0065 0.0066 0.0067 0.0068 0.0070 0.0072 0.0074 � 6
. . . 0.0076 0.0077 0.0078 0.0079 0.0080 0.0081 0.0082 0.0084 0.0085 0.0088 0.0090 0.0092
. . . . . . . . . 0.0076 0.0077 0.0078 0.0079 0.0079 0.0081 0.0082 0.0084 0.0086 0.0087 � 4
. . . . . . . . . 0.0095 0.0096 0.0097 0.0098 0.0099 0.0101 0.0102 0.0105 0.0107 0.0109
(d) Pitches listed are those used most commonly and are recommended. Where intermediate pitches are specified, the for-mula in para. 5 should be applied.
(e) Tolerances are tabulated only for combinations of diameter, pitch, and length of engagement that are considered to begenerally used. For other combinations encountered, see para. 5.
149
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ASME B1.1-2003 NONMANDATORY APPENDIX D
Table D-7 Pitch Diameter Tolerances for Internal Threads of Special Diameters, Pitches, andLengths of Engagement (UNS/UNRS) — Class 1B
Tolerance based on basic major diameter of 0.0625 0.09375 0.125 0.1875 0.25 0.375 0.5 0.625 0.75 1
For diameter range above 0.0470 0.0781 0.1094 0.1562 0.2188 0.3125 0.4375 0.5625 0.6875 0.875
To and including 0.0781 0.1094 0.1562 0.2188 0.3125 0.4375 0.5625 0.6875 0.875 1.125
Length of Engagement
Threads/in. Number of Pitches in. Pitch Diameter Tolerances, in.
� 5 to 15 0.06 to 0.19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
16 to 30 0.191 to 0.38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 0.07 to 0.21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
16 to 30 0.211 to 0.42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 0.08 to 0.23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
16 to 30 0.231 to 0.46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 0.09 to 0.27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
16 to 30 0.271 to 0.54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 0.10 to 0.31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
16 to 30 0.311 to 0.62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 0.11 to 0.34 . . . 0.0050 0.0051 0.0053 0.0055 0.0058 0.0060 0.0062 0.0063 0.006644
16 to 30 0.341 to 0.68 . . . 0.0062 0.0064 0.0067 0.0069 0.0072 0.0075 0.0077 0.0079 0.0082
� 5 to 15 0.12 to 0.38 . . . . . . 0.0054 0.0056 0.0057 0.0060 0.0062 0.0064 0.0065 0.006840
16 to 30 0.381 to 0.76 . . . . . . 0.0067 0.0070 0.0072 0.0075 0.0078 0.0080 0.0082 0.0085
� 5 to 15 0.14 to 0.42 . . . . . . 0.0056 0.0058 0.0060 0.0063 0.0065 0.0066 0.0068 0.007136
16 to 30 0.421 to 0.84 . . . . . . 0.0070 0.0073 0.0075 0.0078 0.0081 0.0083 0.0085 0.0088
� 5 to 15 0.16 to 0.47 . . . . . . 0.0059 0.0061 0.0063 0.0066 0.0068 0.0070 0.0071 0.007432
16 to 30 0.471 to 0.94 . . . . . . 0.0074 0.0077 0.0079 0.0082 0.0085 0.0087 0.0089 0.0092
� 5 to 15 0.18 to 0.54 . . . . . . . . . 0.0065 0.0067 0.0069 0.0072 0.0073 0.0075 0.007828
16 to 30 0.541 to 1.08 . . . . . . . . . 0.0081 0.0083 0.0087 0.0089 0.0092 0.0094 0.0097
� 5 to 15 0.19 to 0.56 . . . . . . . . . 0.0066 0.0068 0.0070 0.0073 0.0074 0.0076 0.007927
16 to 30 0.561 to 1.12 . . . . . . . . . 0.0083 0.0085 0.0088 0.0091 0.0093 0.0095 0.0098
� 5 to 15 0.21 to 0.62 . . . . . . . . . 0.0070 0.0072 0.0074 0.0076 0.0078 0.0080 0.008224
16 to 30 0.621 to 1.24 . . . . . . . . . 0.0087 0.0089 0.0093 0.0095 0.0098 0.0100 0.0103
� 5 to 15 0.25 to 0.75 . . . . . . . . . . . . 0.0078 0.0080 0.0083 0.0084 0.0086 0.008920
16 to 30 0.751 to 1.50 . . . . . . . . . . . . 0.0097 0.0101 0.0103 0.0105 0.0107 0.0111
� 5 to 15 0.28 to 0.83 . . . . . . . . . . . . . . . 0.0084 0.0087 0.0088 0.0090 0.009318
16 to 30 0.831 to 1.66 . . . . . . . . . . . . . . . 0.0105 0.0108 0.0110 0.0112 0.0116
� 5 to 15 0.31 to 0.94 . . . . . . . . . . . . . . . 0.0089 0.0091 0.0093 0.0095 0.009716
16 to 30 0.941 to 1.88 . . . . . . . . . . . . . . . 0.0111 0.0114 0.0116 0.0118 0.0122
� 5 to 15 0.36 to 1.07 . . . . . . . . . . . . . . . . . . 0.0097 0.0099 0.0100 0.010314
16 to 30 1.071 to 2.14 . . . . . . . . . . . . . . . . . . 0.0121 0.0124 0.0125 0.0129
� 5 to 15 0.42 to 1.25 . . . . . . . . . . . . . . . . . . 0.0104 0.0106 0.0108 0.010912
16 to 30 1.251 to 2.50 . . . . . . . . . . . . . . . . . . 0.0130 0.0133 0.0135 0.0138
� 5 to 15 0.50 to 1.50 . . . . . . . . . . . . . . . . . . . . . . . . 0.0117 0.012010
16 to 30 1.501 to 3.00 . . . . . . . . . . . . . . . . . . . . . . . . 0.0147 0.0150
� 5 to 15 0.62 to 1.88 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01338
16 to 30 1.881 to 3.76 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0167
� 5 to 15 0.83 to 2.50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
16 to 30 2.501 to 5.00 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 1.25 to 3.75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
16 to 30 3.751 to 7.50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL NOTES:(a) These values do not agree with and shall not be used in place of any tabulated values for the UNC, UNF, and 4-UN,
6-UN, and 8-UN thread series.(b) Class 1B (internal thread) tolerances in this Table for 5 to 15 pitches are based on 9 pitches and are obtained by multi-
plying the Class 2A (external thread) tolerances for 9 pitches taken to six decimal places by a factor of 1.95.(c) Class 1B tolerances in this Table for 16 to 30 pitches are obtained by multiplying the Class 2A (external thread) toler-
ances for 9 pitches taken to six decimal places by a factor of 2.437 (obtained by multiplying the 1.95 factor by 1.25).For lengths of engagement not tabulated, see para. 5.
150
NONMANDATORY APPENDIX D ASME B1.1-2003
Table D-7 Pitch Diameter Tolerances for External Threads of Special Diameters, Pitches, andLengths of Engagement (UNS/UNRS) — Class 1B
1.25 1.5 1.75 2 2.5 3 3.5 4 5 6 8 10 12
1.125 1.375 1.625 1.875 2.25 2.75 3.25 3.75 4.5 5.5 7 9 11
1.375 1.625 1.875 2.25 2.75 3.25 3.75 4.5 5.5 7 9 11 13
Pitch Diameter Tolerances, in. Threads/in.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 80
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 72
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 64
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 56
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 48
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 44
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 40
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.0073 0.0075 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 360.0091 0.0094 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.0076 0.0078 0.0080 0.0081 0.0084 0.0087 . . . . . . . . . . . . . . . . . . . . . � 320.0095 0.0098 0.0100 0.0102 0.0105 0.0108 . . . . . . . . . . . . . . . . . . . . .
0.0080 0.0082 0.0084 0.0085 0.0088 0.0090 0.0093 0.0095 . . . . . . . . . . . . . . . � 280.0100 0.0102 0.0104 0.0106 0.0110 0.0113 0.0116 0.0118 . . . . . . . . . . . . . . .
0.0080 0.0083 0.0085 0.0085 0.0089 0.0092 0.0094 0.0096 0.0099 0.0103 . . . . . . . . . � 270.0101 0.0104 0.0106 0.0108 0.0111 0.0114 0.0117 0.0120 0.0124 0.0128 . . . . . . . . .
0.0085 0.0087 0.0088 0.0090 0.0093 0.0095 0.0097 0.0100 0.0103 0.0106 . . . . . . . . . � 240.0106 0.0106 0.0110 0.0112 0.0116 0.0119 0.0122 0.0124 0.0129 0.0133 . . . . . . . . .
0.0091 0.0093 0.0095 0.0096 0.0099 0.0101 0.0104 0.0106 0.0109 0.0112 . . . . . . . . . � 200.0114 0.0116 0.0118 0.0120 0.0124 0.0127 0.0130 0.0132 0.0137 0.0141 . . . . . . . . .
0.0095 0.0097 0.0099 0.0100 0.0103 0.0105 0.0108 0.0110 0.0113 0.0116 0.0122 . . . . . . � 180.0118 0.0121 0.0123 0.0125 0.0129 0.0132 0.0135 0.0137 0.0142 0.0146 0.0152 . . . . . .
0.0100 0.0101 0.0103 0.0105 0.0108 0.0110 0.0112 0.0114 0.0118 0.0121 0.0126 0.0131 . . . � 160.0124 0.0127 0.0129 0.0131 0.0135 0.0138 0.0140 0.0143 0.0148 0.0151 0.0158 0.0164 . . .
0.0105 0.0107 0.0109 0.0111 0.0114 0.0116 0.0118 0.0120 0.0124 0.0127 0.0132 0.0137 0.0141 � 140.0132 0.0134 0.0136 0.0138 0.0142 0.0145 0.0148 0.0150 0.0155 0.0159 0.0165 0.0171 0.0176
0.0113 0.0115 0.0116 0.0118 0.0121 0.0123 0.0126 0.0128 0.0131 0.0134 0.0140 0.0144 0.0148 � 120.0141 0.0143 0.0145 0.0147 0.0151 0.0154 0.0157 0.0159 0.0164 0.0168 0.0175 0.0180 0.0185
0.0122 0.0124 0.0126 0.0128 0.0130 0.0133 0.0135 0.0137 0.0141 0.0144 0.0149 0.0154 0.0158 � 100.0153 0.0155 0.0158 0.0160 0.0163 0.0166 0.0169 0.0172 0.0176 0.0180 0.0187 0.0192 0.0197
0.0136 0.0138 0.0139 0.0141 0.0144 0.0146 0.0149 0.0151 0.0154 0.0157 0.0163 0.0167 0.0171 � 80.0170 0.0172 0.0174 0.0176 0.0180 0.0183 0.0186 0.0188 0.0193 0.0197 0.0203 0.0209 0.0214
. . . 0.0158 0.0160 0.0161 0.0164 0.0167 0.0169 0.0171 0.0174 0.0178 0.0183 0.0187 0.0191 � 6
. . . 0.0197 0.0200 0.0202 0.0205 0.0208 0.0211 0.0214 0.0218 0.0222 0.0229 0.0234 0.0239
. . . . . . . . . 0.0197 0.0200 0.0202 0.0204 0.0206 0.0210 0.0213 0.0218 0.0223 0.0227 � 4
. . . . . . . . . 0.0246 0.0250 0.0253 0.0255 0.0258 0.0262 0.0266 0.0273 0.0279 0.0284
(d) Pitches listed are those used most commonly and are recommended. Where intermediate pitches are specified, the for-mula in para. 5 should be applied.
(e) Tolerances are tabulated only for combinations of diameter, pitch, and length of engagement that are considered to begenerally used. For other combinations encountered, see para. 5.
151
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ASME B1.1-2003 NONMANDATORY APPENDIX D
Table D-8 Pitch Diameter Tolerances for Internal Threads of Special Diameters, Pitches, andLengths of Engagement (UNS/UNRS) — Class 2B
Tolerance based on basic major diameter of 0.0625 0.09375 0.125 0.1875 0.25 0.375 0.5 0.625 0.75 1
For diameter range above 0.0470 0.0781 0.1094 0.1562 0.2188 0.3125 0.4375 0.5625 0.6875 0.875
To and including 0.0781 0.1094 0.1562 0.2188 0.3125 0.4375 0.5625 0.6875 0.875 1.125
Length of Engagement
Threads/in. Number of Pitches in. Pitch Diameter Tolerances, in.
� 5 to 15 0.06 to 0.19 0.0025 0.0026 0.0027 0.0028 0.0029 . . . . . . . . . . . . . . .80
16 to 30 0.191 to 0.38 0.0031 0.0032 0.0033 0.0035 0.0037 . . . . . . . . . . . . . . .
� 5 to 15 0.07 to 0.21 0.0026 0.0027 0.0028 0.0029 0.0030 0.0032 . . . . . . . . . . . .72
16 to 30 0.211 to 0.42 0.0032 0.0034 0.0035 0.0037 0.0038 0.0040 . . . . . . . . . . . .
� 5 to 15 0.08 to 0.23 0.0027 0.0028 0.0029 0.0031 0.0032 0.0034 0.0035 . . . . . . . . .64
16 to 30 0.231 to 0.46 0.0034 0.0035 0.0037 0.0038 0.0040 0.0042 0.0044 . . . . . . . . .
� 5 to 15 0.09 to 0.27 . . . 0.0030 0.0031 0.0032 0.0033 0.0035 0.0037 0.0038 0.0039 . . .56
16 to 30 0.271 to 0.54 . . . 0.0037 0.0039 0.0040 0.0042 0.0044 0.0046 0.0047 0.0049 . . .
� 5 to 15 0.10 to 0.31 . . . 0.0032 0.0033 0.0034 0.0036 0.0037 0.0039 0.0040 0.0041 . . .48
16 to 30 0.311 to 0.62 . . . 0.0040 0.0041 0.0043 0.0044 0.0047 0.0048 0.0050 0.0051 . . .
� 5 to 15 0.11 to 0.34 . . . 0.0033 0.0034 0.0036 0.0037 0.0039 0.0040 0.0041 0.0042 0.004444
16 to 30 0.341 to 0.68 . . . 0.0042 0.0043 0.0045 0.0046 0.0048 0.0050 0.0051 0.0053 0.0055
� 5 to 15 0.12 to 0.38 . . . . . . 0.0036 0.0037 0.0038 0.0041 0.0041 0.0043 0.0044 0.004540
16 to 30 0.381 to 0.76 . . . . . . 0.0045 0.0046 0.0048 0.0050 0.0052 0.0053 0.0055 0.0057
� 5 to 15 0.14 to 0.42 . . . . . . 0.0037 0.0039 0.0040 0.0042 0.0043 0.0044 0.0045 0.004736
16 to 30 0.421 to 0.84 . . . . . . 0.0047 0.0049 0.0050 0.0052 0.0054 0.0055 0.0057 0.0059
� 5 to 15 0.16 to 0.47 . . . . . . 0.0030 0.0041 0.0042 0.0044 0.0045 0.0046 0.0047 0.004932
16 to 30 0.471 to 0.94 . . . . . . 0.0049 0.0051 0.0052 0.0055 0.0056 0.0058 0.0059 0.0061
� 5 to 15 0.18 to 0.54 . . . . . . . . . 0.0043 0.0044 0.0046 0.0048 0.0049 0.0050 0.005228
16 to 30 0.541 to 1.08 . . . . . . . . . 0.0054 0.0056 0.0058 0.0060 0.0061 0.0062 0.0065
� 5 to 15 0.19 to 0.56 . . . . . . . . . 0.0044 0.0045 0.0047 0.0048 0.0050 0.0051 0.005227
16 to 30 0.561 to 1.12 . . . . . . . . . 0.0055 0.0057 0.0059 0.0061 0.0062 0.0063 0.0066
� 5 to 15 0.21 to 0.62 . . . . . . . . . 0.0047 0.0048 0.0049 0.0051 0.0052 0.0053 0.005524
16 to 30 0.621 to 1.24 . . . . . . . . . 0.0058 0.0060 0.0062 0.0064 0.0065 0.0066 0.0069
� 5 to 15 0.25 to 0.75 . . . . . . . . . . . . 0.0052 0.0055 0.0056 0.0057 0.0057 0.005920
16 to 30 0.751 to 1.50 . . . . . . . . . . . . 0.0065 0.0067 0.0069 0.0072 0.0074 0.0074
� 5 to 15 0.28 to 0.83 . . . . . . . . . . . . . . . 0.0056 0.0059 0.0060 0.0060 0.006218
16 to 30 0.831 to 1.66 . . . . . . . . . . . . . . . 0.0070 0.0072 0.0074 0.0075 0.0077
� 5 to 15 0.31 to 0.94 . . . . . . . . . . . . . . . 0.0059 0.0061 0.0062 0.0063 0.006516
16 to 30 0.941 to 1.88 . . . . . . . . . . . . . . . 0.0074 0.0076 0.0077 0.0079 0.0081
� 5 to 15 0.36 to 1.07 . . . . . . . . . . . . . . . . . . 0.0065 0.0066 0.0067 0.006914
16 to 30 1.071 to 2.14 . . . . . . . . . . . . . . . . . . 0.0081 0.0082 0.0084 0.0086
� 5 to 15 0.42 to 1.25 . . . . . . . . . . . . . . . . . . 0.0070 0.0071 0.0072 0.007412
16 to 30 1.251 to 2.50 . . . . . . . . . . . . . . . . . . 0.0087 0.0088 0.0090 0.0092
� 5 to 15 0.50 to 1.50 . . . . . . . . . . . . . . . . . . . . . . . . 0.0078 0.008010
16 to 30 1.501 to 3.00 . . . . . . . . . . . . . . . . . . . . . . . . 0.0098 0.0100
� 5 to 15 0.62 to 1.88 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.00898
16 to 30 1.881 to 3.76 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0111
� 5 to 15 0.83 to 2.50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
16 to 30 2.501 to 5.00 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 1.25 to 3.75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
16 to 30 3.751 to 7.50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL NOTES:(a) These values do not agree with and shall not be used in place of any tabulated values for the UNC, UNF, and 4-UN,
6-UN, and 8-UN thread series.(b) Class 2B (internal thread) tolerances in this Table for 5 to 15 pitches are based on 9 pitches and are obtained by multi-
plying the Class 2A (external thread) tolerances for 9 pitches taken to six decimal places by a factor of 1.3.(c) Class 2B tolerances in this Table for 16 to 30 pitches are obtained by multiplying the Class 2A (external thread) toler-
ances for 9 pitches taken to six decimal places by a factor of 1.625 (obtained by multiplying the 1.3 factor by 1.25).For lengths of engagement not tabulated, see para. 5.
152
NONMANDATORY APPENDIX D ASME B1.1-2003
Table D-8 Pitch Diameter Tolerances for External Threads of Special Diameters, Pitches, andLengths of Engagement (UNS/UNRS) — Class 2B
1.25 1.5 1.75 2 2.5 3 3.5 4 5 6 8 10 12
1.125 1.375 1.625 1.875 2.25 2.75 3.25 3.75 4.5 5.5 7 9 11
1.375 1.625 1.875 2.25 2.75 3.25 3.75 4.5 5.5 7 9 11 13
Pitch Diameter Tolerances, in. Threads/in.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 80
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 72
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 64
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 56
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 48
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 44
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 40
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.0049 0.0050 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 360.0061 0.0062 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.0051 0.0052 0.0053 0.0054 0.0056 0.0058 . . . . . . . . . . . . . . . . . . . . . � 320.0063 0.0065 0.0066 0.0068 0.0070 0.0072 . . . . . . . . . . . . . . . . . . . . .
0.0053 0.0055 0.0056 0.0057 0.0059 0.0060 0.0062 0.0063 . . . . . . . . . . . . . . . � 280.0067 0.0068 0.0070 0.0071 0.0073 0.0075 0.0077 0.0079 . . . . . . . . . . . . . . .
0.0053 0.0055 0.0056 0.0057 0.0059 0.0061 0.0063 0.0064 0.0066 0.0068 . . . . . . . . . � 270.0067 0.0069 0.0071 0.0072 0.0074 0.0076 0.0078 0.0080 0.0083 0.0085 . . . . . . . . .
0.0056 0.0058 0.0059 0.0060 0.0062 0.0064 0.0065 0.0066 0.0069 0.0071 . . . . . . . . . � 240.0070 0.0072 0.0074 0.0075 0.0077 0.0079 0.0081 0.0083 0.0086 0.0089 . . . . . . . . .
0.0061 0.0062 0.0063 0.0064 0.0066 0.0068 0.0069 0.0070 0.0073 0.0075 . . . . . . . . . � 200.0076 0.0077 0.0079 0.0080 0.0083 0.0085 0.0086 0.0088 0.0091 0.0094 . . . . . . . . .
0.0063 0.0065 0.0066 0.0067 0.0069 0.0070 0.0072 0.0073 0.0076 0.0078 0.0081 . . . . . . � 180.0079 0.0081 0.0082 0.0083 0.0086 0.0088 0.0090 0.0091 0.0094 0.0097 0.0101 . . . . . .
0.0066 0.0068 0.0069 0.0070 0.0072 0.0073 0.0075 0.0076 0.0079 0.0081 0.0084 0.0087 . . . � 160.0083 0.0085 0.0086 0.0087 0.0090 0.0092 0.0094 0.0095 0.0098 0.0101 0.0105 0.0109 . . .
0.0070 0.0072 0.0073 0.0074 0.0076 0.0077 0.0079 0.0080 0.0083 0.0085 0.0088 0.0091 0.0094 � 140.0088 0.0089 0.0091 0.0092 0.0095 0.0097 0.0099 0.0100 0.0103 0.0106 0.0110 0.0114 0.0117
0.0075 0.0076 0.0078 0.0079 0.0081 0.0082 0.0084 0.0085 0.0087 0.0090 0.0093 0.0096 0.0099 � 120.0094 0.0096 0.0097 0.0098 0.0101 0.0103 0.0105 0.0106 0.0109 0.0112 0.0116 0.0120 0.0123
0.0082 0.0083 0.0084 0.0085 0.0087 0.0089 0.0090 0.0091 0.0094 0.0096 0.0100 0.0103 0.0105 � 100.0102 0.0104 0.0105 0.0106 0.0109 0.0111 0.0113 0.0114 0.0117 0.0120 0.0124 0.0128 0.0131
0.0090 0.0092 0.0093 0.0094 0.0096 0.0098 0.0099 0.0100 0.0103 0.0105 0.0108 0.0111 0.0114 � 80.0113 0.0115 0.0116 0.0118 0.0120 0.0122 0.0124 0.0125 0.0128 0.0131 0.0136 0.0139 0.0143
. . . 0.0105 0.0106 0.0108 0.0109 0.0111 0.0113 0.0114 0.0116 0.0118 0.0122 0.0125 0.0128 � 6
. . . 0.0132 0.0133 0.0134 0.0137 0.0139 0.0141 0.0142 0.0145 0.0148 0.0152 0.0156 0.0159
. . . . . . . . . 0.0131 0.0133 0.0135 0.0136 0.0138 0.0140 0.0142 0.0146 0.0149 0.0151 � 4
. . . . . . . . . 0.0164 0.0166 0.0168 0.0170 0.0172 0.0175 0.0178 0.0182 0.0186 0.0189
(d) Pitches listed are those used most commonly and are recommended. Where intermediate pitches are specified, the for-mula in para. 5 should be applied.
(e) Tolerances are tabulated only for combinations of diameter, pitch, and length of engagement that are considered to begenerally used. For other combinations encountered, see para. 5.
153
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ASME B1.1-2003 NONMANDATORY APPENDIX D
Table D-9 Pitch Diameter Tolerances for Internal Threads of Special Diameters, Pitches, andLengths of Engagement (UNS/UNRS) — Class 3B
Tolerance based on basic major diameter of 0.0625 0.09375 0.125 0.1875 0.25 0.375 0.5 0.625 0.75 1
For diameter range above 0.0470 0.0781 0.1094 0.1562 0.2188 0.3125 0.4375 0.5625 0.6875 0.875
To and including 0.0781 0.1094 0.1562 0.2188 0.3125 0.4375 0.5625 0.6875 0.875 1.125
Length of Engagement
Threads/in. Number of Pitches in. Pitch Diameter Tolerances, in.
� 5 to 15 0.06 to 0.19 0.0019 0.0019 0.0020 0.0021 0.0022 . . . . . . . . . . . . . . .80
16 to 30 0.191 to 0.38 0.0023 0.0024 0.0025 0.0026 0.0027 . . . . . . . . . . . . . . .
� 5 to 15 0.07 to 0.21 0.0019 0.0020 0.0021 0.0022 0.0023 0.0024 . . . . . . . . . . . .72
16 to 30 0.211 to 0.42 0.0024 0.0025 0.0026 0.0027 0.0029 0.0030 . . . . . . . . . . . .
� 5 to 15 0.08 to 0.23 0.0020 0.0021 0.0022 0.0023 0.0024 0.0025 0.0026 . . . . . . . . .64
16 to 30 0.231 to 0.46 0.0026 0.0027 0.0027 0.0029 0.0030 0.0031 0.0033 . . . . . . . . .
� 5 to 15 0.09 to 0.27 . . . 0.0023 0.0023 0.0024 0.0025 0.0026 0.0027 0.0028 0.0029 . . .56
16 to 30 0.271 to 0.54 . . . 0.0028 0.0029 0.0030 0.0031 0.0033 0.0034 0.0035 0.0036 . . .
� 5 to 15 0.10 to 0.31 . . . 0.0024 0.0025 0.0026 0.0027 0.0028 0.0029 0.0030 0.0031 . . .48
16 to 30 0.311 to 0.62 . . . 0.0030 0.0031 0.0032 0.0033 0.0035 0.0036 0.0037 0.0038 . . .
� 5 to 15 0.11 to 0.34 . . . 0.0025 0.0026 0.0027 0.0028 0.0029 0.0030 0.0031 0.0032 0.003344
16 to 30 0.341 to 0.68 . . . 0.0031 0.0032 0.0033 0.0034 0.0036 0.0037 0.0039 0.0040 0.0041
� 5 to 15 0.12 to 0.38 . . . . . . 0.0027 0.0028 0.0029 0.0030 0.0031 0.0032 0.0033 0.003440
16 to 30 0.381 to 0.76 . . . . . . 0.0033 0.0035 0.0036 0.0037 0.0039 0.0040 0.0041 0.0043
� 5 to 15 0.14 to 0.42 . . . . . . 0.0028 0.0029 0.0030 0.0031 0.0032 0.0033 0.0034 0.003536
16 to 30 0.421 to 0.84 . . . . . . 0.0035 0.0036 0.0037 0.0039 0.0040 0.0042 0.0043 0.0044
� 5 to 15 0.16 to 0.47 . . . . . . 0.0030 0.0031 0.0031 0.0033 0.0034 0.0035 0.0036 0.003732
16 to 30 0.471 to 0.94 . . . . . . 0.0037 0.0038 0.0039 0.0041 0.0042 0.0043 0.0044 0.0046
� 5 to 15 0.18 to 0.54 . . . . . . . . . 0.0033 0.0033 0.0035 0.0036 0.0037 0.0037 0.003928
16 to 30 0.541 to 1.08 . . . . . . . . . 0.0041 0.0042 0.0043 0.0045 0.0046 0.0047 0.0048
� 5 to 15 0.19 to 0.56 . . . . . . . . . 0.0033 0.0034 0.0035 0.0036 0.0037 0.0038 0.003927
16 to 30 0.561 to 1.12 . . . . . . . . . 0.0041 0.0042 0.0044 0.0045 0.0046 0.0047 0.0049
� 5 to 15 0.21 to 0.62 . . . . . . . . . 0.0035 0.0036 0.0037 0.0038 0.0039 0.0040 0.004124
16 to 30 0.621 to 1.24 . . . . . . . . . 0.0044 0.0045 0.0046 0.0048 0.0049 0.0050 0.0051
� 5 to 15 0.25 to 0.75 . . . . . . . . . . . . 0.0039 0.0040 0.0041 0.0042 0.0043 0.004420
16 to 30 0.751 to 1.50 . . . . . . . . . . . . 0.0049 0.0050 0.0052 0.0053 0.0054 0.0055
� 5 to 15 0.28 to 0.83 . . . . . . . . . . . . . . . 0.0042 0.0043 0.0044 0.0045 0.004618
16 to 30 0.831 to 1.66 . . . . . . . . . . . . . . . 0.0053 0.0054 0.0055 0.0056 0.0058
� 5 to 15 0.31 to 0.94 . . . . . . . . . . . . . . . 0.0045 0.0046 0.0046 0.0047 0.004916
16 to 30 0.941 to 1.88 . . . . . . . . . . . . . . . 0.0056 0.0057 0.0058 0.0059 0.0061
� 5 to 15 0.36 to 1.07 . . . . . . . . . . . . . . . . . . 0.0049 0.0049 0.0050 0.005214
16 to 30 1.071 to 2.14 . . . . . . . . . . . . . . . . . . 0.0061 0.0062 0.0063 0.0064
� 5 to 15 0.42 to 1.25 . . . . . . . . . . . . . . . . . . 0.0052 0.0053 0.0054 0.005512
16 to 30 1.251 to 2.50 . . . . . . . . . . . . . . . . . . 0.0065 0.0066 0.0067 0.0069
� 5 to 15 0.50 to 1.50 . . . . . . . . . . . . . . . . . . . . . . . . 0.0059 0.006010
16 to 30 1.501 to 3.00 . . . . . . . . . . . . . . . . . . . . . . . . 0.0073 0.0075
� 5 to 15 0.62 to 1.88 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.00678
16 to 30 1.881 to 3.76 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0083
� 5 to 15 0.83 to 2.50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
16 to 30 2.501 to 5.00 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
� 5 to 15 1.25 to 3.75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
16 to 30 3.751 to 7.50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL NOTES:(a) These values do not agree with and shall not be used in place of any tabulated values for the UNC, UNF, and 4-UN,
6-UN, and 8-UN thread series.(b) Class 3B (internal thread) tolerances in this Table for 5 to 15 pitches are based on 9 pitches and are obtained by multi-
plying the Class 2A (external thread) tolerances for 9 pitches taken to six decimal places by a factor of 0.975.(c) Class 3B tolerances in this Table for 16 to 30 pitches are obtained by multiplying the Class 2A (external thread) toler-
ances for 9 pitches taken to six decimal places by a factor of 1.21875 (obtained by multiplying the 0.975 factor by1.25). For lengths of engagement not tabulated, see para. 5.
154
NONMANDATORY APPENDIX D ASME B1.1-2003
Table D-9 Pitch Diameter Tolerances for External Threads of Special Diameters, Pitches, andLengths of Engagement (UNS/UNRS) — Class 3B
1.25 1.5 1.75 2 2.5 3 3.5 4 5 6 8 10 12
1.125 1.375 1.625 1.875 2.25 2.75 3.25 3.75 4.5 5.5 7 9 11
1.375 1.625 1.875 2.25 2.75 3.25 3.75 4.5 5.5 7 9 11 13
Pitch Diameter Tolerances, in. Threads/in.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 80
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 72
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 64
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 56
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 48
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 44
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 40
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.0036 0.0037 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � 360.0046 0.0047 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.0038 0.0039 0.0040 0.0041 0.0042 0.0043 . . . . . . . . . . . . . . . . . . . . . � 320.0048 0.0049 0.0050 0.0051 0.0053 0.0054 . . . . . . . . . . . . . . . . . . . . .
0.0040 0.0041 0.0042 0.0043 0.0044 0.0045 0.0046 0.0047 . . . . . . . . . . . . . . . � 280.0050 0.0051 0.0052 0.0053 0.0055 0.0057 0.0058 0.0059 . . . . . . . . . . . . . . .
0.0040 0.0041 0.0042 0.0043 0.0045 0.0046 0.0047 0.0048 0.0050 0.0051 . . . . . . . . . � 270.0051 0.0052 0.0053 0.0054 0.0056 0.0057 0.0059 0.0060 0.0062 0.0064 . . . . . . . . .
0.0042 0.0043 0.0044 0.0045 0.0046 0.0048 0.0049 0.0050 0.0052 0.0053 . . . . . . . . . � 240.0053 0.0054 0.0055 0.0056 0.0058 0.0060 0.0061 0.0062 0.0064 0.0066 . . . . . . . . .
0.0045 0.0046 0.0047 0.0048 0.0050 0.0051 0.0052 0.0053 0.0055 0.0056 . . . . . . . . . � 200.0057 0.0058 0.0059 0.0060 0.0062 0.0063 0.0065 0.0066 0.0068 0.0070 . . . . . . . . .
0.0047 0.0048 0.0049 0.0050 0.0051 0.0053 0.0054 0.0055 0.0057 0.0058 0.0061 . . . . . . � 180.0059 0.0060 0.0062 0.0063 0.0064 0.0066 0.0067 0.0069 0.0071 0.0073 0.0076 . . . . . .
0.0050 0.0051 0.0052 0.0052 0.0054 0.0055 0.0056 0.0057 0.0059 0.0061 0.0063 0.0066 . . . � 160.0062 0.0063 0.0065 0.0066 0.0067 0.0069 0.0070 0.0072 0.0074 0.0076 0.0079 0.0082 . . .
0.0053 0.0054 0.0055 0.0055 0.0057 0.0058 0.0059 0.0060 0.0062 0.0063 0.0066 0.0068 0.0070 � 140.0066 0.0067 0.0068 0.0069 0.0071 0.0072 0.0074 0.0075 0.0077 0.0079 0.0083 0.0086 0.0088
0.0056 0.0057 0.0058 0.0059 0.0060 0.0062 0.0063 0.0064 0.0066 0.0067 0.0070 0.0072 0.0074 � 120.0070 0.0072 0.0073 0.0074 0.0076 0.0077 0.0078 0.0080 0.0082 0.0084 0.0087 0.0090 0.0093
0.0061 0.0062 0.0063 0.0064 0.0065 0.0066 0.0068 0.0069 0.0070 0.0072 0.0075 0.0077 0.0079 � 100.0076 0.0078 0.0079 0.0080 0.0082 0.0083 0.0084 0.0086 0.0088 0.0090 0.0093 0.0096 0.0099
0.0068 0.0069 0.0070 0.0071 0.0072 0.0073 0.0074 0.0075 0.0077 0.0079 0.0081 0.0084 0.0086 � 80.0085 0.0086 0.0087 0.0088 0.0090 0.0091 0.0093 0.0094 0.0096 0.0098 0.0102 0.0104 0.0107
. . . 0.0079 0.0080 0.0081 0.0082 0.0083 0.0084 0.0085 0.0087 0.0089 0.0091 0.0094 0.0096 � 6
. . . 0.0090 0.0100 0.0101 0.0103 0.0104 0.0106 0.0107 0.0109 0.0111 0.0114 0.0117 0.0120
. . . . . . . . . 0.0098 0.0100 0.0101 0.0102 0.0103 0.0105 0.0107 0.0109 0.0111 0.0113 � 4
. . . . . . . . . 0.0123 0.0125 0.0126 0.0128 0.0129 0.0131 0.0133 0.0137 0.0139 0.0142
(d) Pitches listed are those used most commonly and are recommended. Where intermediate pitches are specified, the for-mula in para. 5 should be applied.
(e) Tolerances are tabulated only for combinations of diameter, pitch, and length of engagement that are considered to begenerally used. For other combinations encountered, see para. 5.
155
标准下载网(www.bzxzw.com)
156
Tabl
eD
-10
Min
orD
iam
eter
Tole
ranc
esfo
rIn
tern
alSp
ecia
lSc
rew
Thre
ads
(UN
S/U
NRS
)—
Clas
ses
1Ban
d2B
Tole
ranc
eba
sed
onba
sic
maj
ordi
amet
erof
0.06
00.
073
0.08
60.
099
0.11
20.
125
0.13
80.
164
0.19
00.
216
For
diam
eter
rang
eab
ove
0.05
30.
066
0.07
90.
092
0.10
50.
118
0.13
10.
151
0.17
70.
203
All
Larg
erTo
and
incl
udin
g0.
066
0.07
90.
092
0.10
50.
118
0.13
10.
151
0.17
70.
203
0.23
3D
iam
eter
s
Leng
thof
Eng.
inTe
rms
ofD
iam
.[N
ote
(1)]
Thre
ads/
Tole
ranc
eTo
and
in.
Rat
ios
Abo
veIn
cl.
Min
orD
iam
eter
Tole
ranc
es,
in.
[Not
e(2
)]
0.5
00.
33D
0.00
350.
0029
0.00
250.
0022
0.00
200.
0018
0.00
170.
0016
0.00
160.
0016
0.00
16
�0.75
0.33
D0.
67D
0.00
490.
0044
0.00
380.
0034
0.00
300.
0028
0.00
260.
0023
0.00
230.
0023
0.00
2380
1.0
0.67
D1.
5D0.
0049
0.00
490.
0049
0.00
450.
0040
0.00
370.
0034
0.00
310.
0031
0.00
310.
0031
1.25
1.5D
3D0.
0049
0.00
490.
0049
0.00
490.
0049
0.00
460.
0043
0.00
390.
0039
0.00
390.
0039
0.5
00.
33D
0.00
390.
0033
0.00
290.
0026
0.00
230.
0021
0.00
200.
0017
0.00
170.
0017
0.00
17
�0.75
0.33
D0.
67D
0.00
550.
0049
0.00
430.
0040
0.00
350.
0032
0.00
290.
0026
0.00
260.
0026
0.00
2672
1.0
0.67
D1.
5D0.
0055
0.00
550.
0055
0.00
510.
0046
0.00
420.
0039
0.00
340.
0034
0.00
340.
0034
1.25
1.5D
3D0.
0055
0.00
550.
0055
0.00
550.
0055
0.00
530.
0049
0.00
430.
0042
0.00
420.
0042
0.5
00.
33D
0.00
450.
0038
0.00
330.
0029
0.00
270.
0024
0.00
230.
0020
0.00
190.
0019
0.00
19
�0.75
0.33
D0.
67D
0.00
620.
0057
0.00
490.
0044
0.00
400.
0037
0.00
340.
0030
0.00
280.
0028
0.00
2864
1.0
0.67
D1.
5D0.
0062
0.00
620.
0062
0.00
590.
0053
0.00
490.
0045
0.00
400.
0038
0.00
380.
0038
1.25
1.5D
3D0.
0062
0.00
620.
0062
0.00
620.
0062
0.00
610.
0057
0.00
500.
0048
0.00
480.
0048
0.5
00.
33D
...
0.00
440.
0038
0.00
340.
0031
0.00
290.
0026
0.00
230.
0022
0.00
220.
0022
�0.75
0.33
D0.
67D
...
0.00
660.
0057
0.00
510.
0046
0.00
430.
0040
0.00
350.
0032
0.00
320.
0032
561.
00.
67D
1.5D
...
0.00
700.
0070
0.00
680.
0062
0.00
570.
0053
0.00
470.
0043
0.00
430.
0043
1.25
1.5D
3D..
.0.
0070
0.00
700.
0070
0.00
700.
0070
0.00
660.
0059
0.00
540.
0054
0.00
54
0.5
00.
33D
...
...
0.00
450.
0040
0.00
370.
0034
0.00
320.
0028
0.00
250.
0025
0.00
25
�0.75
0.33
D0.
67D
...
...
0.00
680.
0061
0.00
550.
0051
0.00
470.
0042
0.00
380.
0038
0.00
3848
1.0
0.67
D1.
5D..
...
.0.
0082
0.00
810.
0074
0.00
680.
0063
0.00
560.
0051
0.00
500.
0050
1.25
1.5D
3D..
...
.0.
0082
0.00
820.
0082
0.00
820.
0079
0.00
700.
0063
0.00
620.
0062
0.5
00.
33D
...
...
0.00
500.
0044
0.00
400.
0037
0.00
350.
0031
0.00
280.
0028
0.00
28
�0.75
0.33
D0.
67D
...
...
0.00
750.
0067
0.00
610.
0056
0.00
520.
0046
0.00
420.
0041
0.00
4144
1.0
0.67
D1.
5D..
...
.0.
0090
0.00
890.
0081
0.00
750.
0070
0.00
620.
0056
0.00
550.
0055
1.25
1.5D
3D..
...
.0.
0090
0.00
900.
0090
0.00
900.
0087
0.00
770.
0070
0.00
690.
0069
0.5
00.
33D
...
...
...
0.00
490.
0045
0.00
410.
0039
0.00
340.
0031
0.00
300.
0030
�0.75
0.33
D0.
67D
...
...
...
0.00
740.
0067
0.00
620.
0058
0.00
510.
0047
0.00
450.
0045
401.
00.
67D
1.5D
...
...
...
0.00
980.
0090
0.00
830.
0077
0.00
680.
0062
0.00
600.
0060
1.25
1.5D
3D..
...
...
.0.
0098
0.00
980.
0098
0.00
960.
0086
0.00
780.
0075
0.00
75
ASME B1.1-2003 NONMANDATORY APPENDIX D
157
Tabl
eD
-10
Min
orD
iam
eter
Tole
ranc
esfo
rIn
tern
alSp
ecia
lSc
rew
Thre
ads
(UN
S/U
NR
S)
—Cl
asse
s1B
and
2B(C
ont’
d)
Tole
ranc
eba
sed
onba
sic
maj
ordi
amet
erof
0.06
00.
073
0.08
60.
099
0.11
20.
125
0.13
80.
164
0.19
00.
216
For
diam
eter
rang
eab
ove
0.05
30.
066
0.07
90.
092
0.10
50.
118
0.13
10.
151
0.17
70.
203
All
Larg
erTo
and
incl
udin
g0.
066
0.07
90.
092
0.10
50.
118
0.13
10.
151
0.17
70.
203
0.23
3D
iam
eter
s
Leng
thof
Eng.
inTe
rms
ofD
iam
.[N
ote
(1)]
Thre
ads/
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ranc
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and
in.
Rat
ios
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veIn
cl.
Min
orD
iam
eter
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ranc
es,
in.
[Not
e(2
)]
0.5
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0098
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0121
NONMANDATORY APPENDIX D ASME B1.1-2003
标准下载网(www.bzxzw.com)
158
Tabl
eD
-10
Min
orD
iam
eter
Tole
ranc
esfo
rIn
tern
alSp
ecia
lSc
rew
Thre
ads
(UN
S/U
NR
S)
—Cl
asse
s1B
and
2B(C
ont’
d)
Leng
thof
Eng.
inTe
rms
Leng
thof
Eng.
inTe
rms
Min
orD
ia.
Min
orD
ia.
ofD
iam
.[N
ote
(1)]
ofD
iam
.[N
ote
(1)]
Tole
ranc
es,
in.
Tole
ranc
es,
in.
Thre
ads/
Tole
ranc
eTo
and
(Not
App
licab
leto
Dia
.Th
read
s/To
lera
nce
Toan
d(N
otA
pplic
able
toD
ia.
in.
Rat
ios
Abo
veIn
clud
ing
Less
Than
0.25
in.)
in.
Rat
ios
Abo
veIn
clud
ing
Less
Than
0.25
in.)
0.5
00.
33D
0.00
58
�0.75
0.33
D0.
67D
0.00
8620
1.0
0.67
D1.
5D0.
0015
1.25
1.5D
3D0.
0144
0.5
00.
33D
0.00
64
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0.33
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0.00
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0159
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0.00
70
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0.33
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0.00
79
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0.33
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0158
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1.5D
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0198
0.5
00.
33D
0.00
85
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0.33
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67D
0.01
2813
1.0
0.67
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5D0.
0170
1.25
1.5D
3D0.
0213
0.5
00.
33D
0.00
90
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0.33
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67D
0.01
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1.0
0.67
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5D0.
0180
1.25
1.5D
3D0.
0225
0.5
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33D
0.00
97
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0.33
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67D
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05
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67D
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0.02
62
0.5
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33D
0.01
14
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0.33
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67D
0.01
719
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0.67
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25
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67D
0.01
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0312
0.5
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33D
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38
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0344
0.5
00.
33D
0.01
53
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0.33
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67D
0.02
306
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0.67
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5D0.
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1.5D
3D0.
0382
0.5
00.
33D
0.01
70
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0.33
D0.
67D
0.02
555
1.0
0.67
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5D0.
0340
1.25
1.5D
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0425
0.5
00.
33D
0.01
79
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0.33
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0.02
684.
51.
00.
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0.03
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251.
5D3D
0.04
48
0.5
00.
33D
0.01
88
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0.33
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67D
0.02
814
1.0
0.67
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5D0.
0375
1.25
1.5D
3D0.
0469
NO
TES
:(1
)To
lera
nces
for
leng
ths
ofen
gage
men
tin
term
sof
pitc
hsh
ould
bese
lect
edfr
omeq
uiva
lent
leng
ths
ofen
gage
men
tin
term
sof
diam
eter
rang
es.
(2)
Ifth
em
inor
diam
eter
tole
ranc
eas
sele
cted
from
this
Tabl
eis
less
than
the
pitc
hdi
amet
erto
lera
nce,
use
the
latt
er.
ASME B1.1-2003 NONMANDATORY APPENDIX D
NONMANDATORY APPENDIX D ASME B1.1-2003
Table D-11 Minor Diameter Tolerances for Internal Special Screw Threads(UNS/UNRS) — Class 3B
Tolerance based on basic major diameter of . . . 0.161 0.190 0.216 0.250 0.3125 0.375 0.4375 0.500 0.5625 0.625 0.6875
For diameter range above 0.053 0.151 0.177 0.203 0.233 0.281 0.344 0.406 0.469 0.531 0.594 0.656
To and including 0.151 0.177 0.203 0.233 0.281 0.344 0.406 0.469 0.531 0.594 0.656 0.719 All Larger(1) Diameters
Length of Eng. in Termsof Diameter [Note (2)]
Threads/ Tolerance To andin. Ratios Above Including Minor Diameter Tolerances, in. [Note (3)]
�0.5 0 0.33D . . . 0.0015 0.0013 0.0013 0.0013 0.0013 . . . . . . . . . . . . . . . . . . . . .0.75 0.33D 0.67D . . . 0.0022 0.0020 0.0020 0.0020 0.0020 . . . . . . . . . . . . . . . . . . . . .
801.0 0.67D 1.5D . . . 0.0030 0.0027 0.0026 0.0026 0.0026 . . . . . . . . . . . . . . . . . . . . .1.25 1.5D 3D . . . 0.0037 0.0033 0.0033 0.0033 0.0033 . . . . . . . . . . . . . . . . . . . . .
�0.5 0 0.33D . . . 0.0017 0.0015 0.0015 0.0015 0.0015 0.0015 0.0015 . . . . . . . . . . . . . . .0.75 0.33D 0.67D . . . 0.0026 0.0023 0.0022 0.0022 0.0022 0.0022 0.0022 . . . . . . . . . . . . . . .
721.0 0.67D 1.5D . . . 0.0034 0.0031 0.0029 0.0029 0.0029 0.0029 0.0029 . . . . . . . . . . . . . . .1.25 1.5D 3D . . . 0.0043 0.0039 0.0036 0.0036 0.0036 0.0036 0.0036 . . . . . . . . . . . . . . .
�0.5 0 0.33D . . . 0.0020 0.0018 0.0016 0.0016 0.0016 0.0016 0.0016 0.0016 0.0016 . . . . . . . . .0.75 0.33D 0.67D . . . 0.0030 0.0027 0.0025 0.0024 0.0024 0.0024 0.0024 0.0024 0.0024 . . . . . . . . .
641.0 0.67D 1.5D . . . 0.0040 0.0036 0.0033 0.0032 0.0032 0.0032 0.0032 0.0032 0.0032 . . . . . . . . .1.25 1.5D 3D . . . 0.0050 0.0045 0.0041 0.0040 0.0040 0.0040 0.0040 0.0040 0.0040 . . . . . . . . .
�0.5 0 0.33D . . . 0.0023 0.0021 0.0019 0.0018 0.0018 0.0018 0.0018 0.0018 0.0018 0.0018 0.0018 0.00180.75 0.33D 0.67D . . . 0.0035 0.0032 0.0029 0.0027 0.0027 0.0027 0.0027 0.0027 0.0027 0.0027 0.0027 0.0027
561.0 0.67D 1.5D . . . 0.0047 0.0042 0.0039 0.0036 0.0036 0.0036 0.0036 0.0036 0.0036 0.0036 0.0036 0.00361.25 1.5D 3D . . . 0.0059 0.0053 0.0049 0.0045 0.0045 0.0045 0.0045 0.0045 0.0045 0.0045 0.0045 0.0045
�0.5 0 0.33D . . . 0.0028 0.0025 0.0023 0.0021 0.0021 0.0021 0.0021 0.0021 0.0021 0.0021 0.0021 0.00210.75 0.33D 0.67D . . . 0.0042 0.0038 0.0035 0.0032 0.0031 0.0031 0.0031 0.0031 0.0031 0.0031 0.0031 0.0031
481.0 0.67D 1.5D . . . 0.0056 0.0051 0.0047 0.0043 0.0041 0.0041 0.0041 0.0041 0.0041 0.0041 0.0041 0.00411.25 1.5D 3D . . . 0.0070 0.0063 0.0059 0.0054 0.0052 0.0052 0.0052 0.0052 0.0052 0.0052 0.0052 0.0052
�0.5 0 0.33D . . . 0.0031 0.0028 0.0026 0.0024 0.0022 0.0022 0.0022 0.0022 0.0022 0.0022 0.0022 0.00220.75 0.33D 0.67D . . . 0.0046 0.0042 0.0039 0.0036 0.0033 0.0033 0.0033 0.0033 0.0033 0.0033 0.0033 0.0033
441.0 0.67D 1.5D . . . 0.0062 0.0056 0.0052 0.0047 0.0045 0.0045 0.0045 0.0045 0.0045 0.0045 0.0045 0.00451.25 1.5D 3D . . . 0.0077 0.0070 0.0065 0.0059 0.0056 0.0056 0.0056 0.0056 0.0056 0.0056 0.0056 0.0056
�0.5 0 0.33D . . . 0.0034 0.0031 0.0029 0.0026 0.0024 0.0024 0.0024 0.0024 0.0024 0.0024 0.0024 0.00240.75 0.33D 0.67D . . . 0.0051 0.0047 0.0043 0.0040 0.0036 0.0036 0.0036 0.0036 0.0036 0.0036 0.0036 0.0036
401.0 0.67D 1.5D . . . 0.0068 0.0062 0.0057 0.0053 0.0048 0.0048 0.0048 0.0048 0.0048 0.0048 0.0048 0.00481.25 1.5D 3D . . . 0.0086 0.0078 0.0072 0.0066 0.0062 0.0062 0.0060 0.0060 0.0060 0.0060 0.0060 0.0060
�0.5 0 0.33D . . . 0.0038 0.0035 0.0032 0.0030 0.0026 0.0026 0.0026 0.0026 0.0026 0.0026 0.0026 0.00260.75 0.33D 0.67D . . . 0.0058 0.0052 0.0048 0.0044 0.0039 0.0039 0.0039 0.0039 0.0039 0.0039 0.0039 0.0039
361.0 0.67D 1.5D . . . 0.0077 0.0070 0.0064 0.0059 0.0053 0.0052 0.0052 0.0052 0.0052 0.0052 0.0052 0.00521.25 1.5D 3D . . . 0.0096 0.0087 0.0081 0.0074 0.0066 0.0065 0.0065 0.0065 0.0065 0.0065 0.0065 0.0065
�0.5 0 0.33D . . . 0.0043 0.0039 0.0036 0.0034 0.0030 0.0029 0.0029 0.0029 0.0029 0.0029 0.0029 0.00290.75 0.33D 0.67D . . . 0.0065 0.0059 0.0055 0.0050 0.0045 0.0043 0.0043 0.0043 0.0043 0.0043 0.0043 0.0043
321.0 0.67D 1.5D . . . 0.0087 0.0079 0.0073 0.0067 0.0060 0.0057 0.0057 0.0057 0.0057 0.0057 0.0057 0.00571.25 1.5D 3D . . . 0.0108 0.0099 0.0091 0.0084 0.0075 0.0072 0.0072 0.0072 0.0072 0.0072 0.0072 0.0072
�0.5 0 0.33D . . . . . . 0.0045 0.0042 0.0039 0.0034 0.0032 0.0032 0.0032 0.0032 0.0032 0.0032 0.00320.75 0.33D 0.67D . . . . . . 0.0068 0.0063 0.0058 0.0051 0.0047 0.0047 0.0047 0.0047 0.0047 0.0047 0.0047
281.0 0.67D 1.5D . . . . . . 0.0091 0.0084 0.0077 0.0069 0.0063 0.0063 0.0063 0.0063 0.0063 0.0063 0.00631.25 1.5D 3D . . . . . . 0.0113 0.0105 0.0096 0.0086 0.0079 0.0079 0.0079 0.0079 0.0079 0.0079 0.0079
�0.5 0 0.33D . . . . . . 0.0047 0.0044 0.0040 0.0036 0.0032 0.0032 0.0032 0.0032 0.0032 0.0032 0.00320.75 0.33D 0.67D . . . . . . 0.0071 0.0065 0.0060 0.0053 0.0048 0.0048 0.0048 0.0048 0.0048 0.0048 0.0048
271.0 0.67D 1.5D . . . . . . 0.0094 0.0087 0.0080 0.0071 0.0065 0.0065 0.0065 0.0065 0.0065 0.0065 0.00651.25 1.5D 3D . . . . . . 0.0118 0.0109 0.0100 0.0089 0.0081 0.0081 0.0081 0.0081 0.0081 0.0081 0.0081
�0.5 0 0.33D . . . . . . 0.0053 0.0049 0.0045 0.0040 0.0037 0.0035 0.0035 0.0035 0.0035 0.0035 0.00350.75 0.33D 0.67D . . . . . . 0.0079 0.0073 0.0068 0.0060 0.0055 0.0052 0.0052 0.0052 0.0052 0.0052 0.0052
241.0 0.67D 1.5D . . . . . . 0.0106 0.0098 0.0090 0.0080 0.0073 0.0070 0.0070 0.0070 0.0070 0.0070 0.00701.25 1.5D 3D . . . . . . 0.0132 0.0122 0.0113 0.0100 0.0092 0.0087 0.0087 0.0087 0.0087 0.0087 0.0087
�0.5 0 0.33D . . . . . . . . . . . . 0.0054 0.0048 0.0044 0.0041 0.0039 0.0039 0.0039 0.0039 0.00390.75 0.33D 0.67D . . . . . . . . . . . . 0.0081 0.0072 0.0066 0.0062 0.0058 0.0058 0.0058 0.0058 0.0058
201.0 0.67D 1.5D . . . . . . . . . . . . 0.0108 0.0096 0.0088 0.0082 0.0078 0.0078 0.0078 0.0078 0.00781.25 1.5D 3D . . . . . . . . . . . . 0.0135 0.0120 0.0110 0.0103 0.0097 0.0097 0.0097 0.0097 0.0097
�0.5 0 0.33D . . . . . . . . . . . . . . . 0.0053 0.0049 0.0045 0.0043 0.0041 0.0041 0.0041 0.00410.75 0.33D 0.67D . . . . . . . . . . . . . . . 0.0080 0.0073 0.0068 0.0065 0.0062 0.0061 0.0061 0.0061
181.0 0.67D 1.5D . . . . . . . . . . . . . . . 0.0106 0.0097 0.0091 0.0086 0.0082 0.0081 0.0081 0.00811.25 1.5D 3D . . . . . . . . . . . . . . . 0.0133 0.0122 0.0114 0.0108 0.0103 0.0102 0.0102 0.0102
�0.5 0 0.33D . . . . . . . . . . . . . . . . . . 0.0054 0.0051 0.0048 0.0046 0.0044 0.0043 0.00430.75 0.33D 0.67D . . . . . . . . . . . . . . . . . . 0.0082 0.0076 0.0072 0.0069 0.0067 0.0064 0.0064
161.0 0.67D 1.5D . . . . . . . . . . . . . . . . . . 0.0109 0.0102 0.0096 0.0092 0.0089 0.0086 0.00851.25 1.5D 3D . . . . . . . . . . . . . . . . . . 0.0136 0.0127 0.0120 0.0115 0.0111 0.0108 0.0106
159
标准下载网(www.bzxzw.com)
ASME B1.1-2003 NONMANDATORY APPENDIX D
Table D-11 Minor Diameter Tolerances for Internal Special Screw Threads(UNS/UNRS) — Class 3B (Cont’d)
Tolerance based on basic major diameter of 0.0375 0.4375 0.500 0.5625 0.625 0.6875 0.750 0.8125 0.875 0.9375
For diameter range above 0.0344 0.406 0.469 0.531 0.594 0.656 0.719 0.781 0.844 0.906All Larger
To and including 0.406 0.469 0.531 0.594 0.656 0.719 0.781 0.844 0.906 0.969 Diameters
Length of Eng. in Termsof Diam. [Note (2)]
Threads/ Tolerance To andin. Ratios Above Including Minor Diameter Tolerances, in. [Note (3)]
�0.5 0 0.33D . . . 0.0058 0.0054 0.0052 0.0050 0.0049 0.0047 0.0046 0.0045 0.0044 0.00440.75 0.33D 0.67D . . . 0.0086 0.0082 0.0078 0.0075 0.0073 0.0071 0.0069 0.0068 0.0067 0.0066
141.0 0.67D 1.5D . . . 0.0115 0.0109 0.0104 0.0100 0.0097 0.0095 0.0092 0.0091 0.0089 0.00881.25 1.5D 3D . . . 0.0144 0.0136 0.0130 0.0125 0.0122 0.0118 0.0116 0.0113 0.0111 0.0110
�0.5 0 0.33D . . . . . . 0.0058 0.0056 0.0054 0.0052 0.0050 0.0050 0.0049 0.0048 0.00470.75 0.33D 0.67D . . . . . . 0.0087 0.0083 0.0080 0.0078 0.0076 0.0074 0.0073 0.0071 0.0070
131.0 0.67D 1.5D . . . . . . 0.0117 0.0111 0.0107 0.0104 0.0101 0.0099 0.0097 0.0095 0.00941.25 1.5D 3D . . . . . . 0.0146 0.0139 0.0134 0.0130 0.0126 0.0124 0.0122 0.0119 0.0118
�0.5 0 0.33D . . . . . . 0.0063 0.0060 0.0058 0.0056 0.0054 0.0053 0.0052 0.0051 0.00500.75 0.33D 0.67D . . . . . . 0.0094 0.0090 0.0087 0.0084 0.0082 0.0080 0.0078 0.0077 0.0075
121.0 0.67D 1.5D . . . . . . 0.0125 0.0120 0.0115 0.0112 0.0109 0.0106 0.0104 0.0102 0.01001.25 1.5D 3D . . . . . . 0.0157 0.0150 0.0144 0.0140 0.0136 0.0133 0.0130 0.0128 0.0125
�0.5 0 0.33D . . . . . . . . . . . . 0.0062 0.0060 0.0058 0.0058 0.0056 0.0055 0.00540.75 0.33D 0.67D . . . . . . . . . . . . 0.0094 0.0091 0.0088 0.0086 0.0084 0.0082 0.0082
111.0 0.67D 1.5D . . . . . . . . . . . . 0.0125 0.0121 0.0177 0.0115 0.0112 0.0110 0.01091.25 1.5D 3D . . . . . . . . . . . . 0.0156 0.0151 0.0146 0.0144 0.0140 0.0138 0.0136
�0.5 0 0.33D . . . . . . . . . . . . . . . 0.0066 0.0064 0.0062 0.0061 0.0060 0.00600.75 0.33D 0.67D . . . . . . . . . . . . . . . 0.0099 0.0096 0.0093 0.0092 0.0090 0.0090
101.0 0.67D 1.5D . . . . . . . . . . . . . . . 0.0131 0.0128 0.0125 0.0122 0.0120 0.01201.25 1.5D 3D . . . . . . . . . . . . . . . 0.0164 0.0160 0.0156 0.0153 0.0150 0.0150
�0.5 0 0.33D . . . . . . . . . . . . . . . . . . . . . 0.0068 0.0067 0.0066 0.00660.75 0.33D 0.67D . . . . . . . . . . . . . . . . . . . . . 0.0103 0.0100 0.0100 0.0100
91.0 0.67D 1.5D . . . . . . . . . . . . . . . . . . . . . 0.0137 0.0134 0.0133 0.01331.25 1.5D 3D . . . . . . . . . . . . . . . . . . . . . 0.0171 0.0168 0.0166 0.0166
�0.5 0 0.33D . . . . . . . . . . . . . . . . . . . . . 0.0075 0.0075 0.0075 0.00750.75 0.33D 0.67D . . . . . . . . . . . . . . . . . . . . . 0.0112 0.0112 0.0112 0.0112
81.0 0.67D 1.5D . . . . . . . . . . . . . . . . . . . . . 0.0150 0.0150 0.0150 0.01501.25 1.5D 3D . . . . . . . . . . . . . . . . . . . . . 0.0188 0.0188 0.0188 0.0188
�0.5 0 0.33D . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0086 0.00860.75 0.33D 0.67D . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0129 0.0129
71.0 0.67D 1.5D . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0171 0.01711.25 1.5D 3D . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0214 0.0214
�0.5 0 0.33D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01000.75 0.33D 0.67D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0150
61.0 0.67D 1.5D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.02001.25 1.5D 3D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0250
�0.5 0 0.33D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01200.75 0.33D 0.67D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0180
51.0 0.67D 1.5D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.02401.25 1.5D 3D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0300
�0.5 0 0.33D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01330.75 0.33D 0.67D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0200
4.51.0 0.67D 1.5D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.02671.25 1.5D 3D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0333
�0.5 0 0.33D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01500.75 0.33D 0.67D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0225
41.0 0.67D 1.5D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.03001.25 1.5D 3D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0375
NOTES:(1) For 0.151 in. diameter sizes and smaller, tolerance values for all three classes are the same. For smaller sizes, toler-
ance values are given in Table D-10.(2) Tolerances for lengths of engagement in terms of pitch should be selected from equivalent lengths of engagement in
terms of diameter ranges.(3) If the minor diameter tolerance as selected from this Table is less than the pitch diameter tolerance, use the latter.
160
ASME B1.1-2003
NONMANDATORY APPENDIX ECHANGES TO ASME B1.1-1989 TABLES 3A AND 3B
This Appendix contains Tables E-1 and E-2, whichshow the thread sizes that were listed in the previousrevisions of ASME B1.1, Tables 3A and 3B, respectively.Those areas in which no data is listed are identical todata in Tables 2 and D-1 in this Standard.
161
标准下载网(www.bzxzw.com)
162
Tabl
eE-
1Li
mit
sas
List
edin
Tabl
e2
(For
mer
ly3A
)Pr
ior
toAS
ME
B1.
1-20
03Ed
itio
n
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Min
orFu
ncti
onal
Dia
met
erU
NR
Min
orM
ajor
Maj
orD
iam
eter
[Not
e(1
)]D
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Min
.M
ax.
Min
.To
lera
nce
Max
.(R
ef.)
Clas
sM
in.
Max
.M
in.
Max
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lera
nce
Min
.
1–
64or
0.07
3–
64U
NC
2A..
...
...
...
...
...
...
...
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...
0.06
23..
...
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...
...
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.0.
0623
...
...
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1–
72or
0.07
3–
72U
NF
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...
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...
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...
0.06
35..
...
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0635
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64or
0.08
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64U
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...
...
...
...
...
...
...
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...
0.07
53..
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...
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...
...
...
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...
...
...
...
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.0.
0753
...
...
...
...
6–
32or
0.13
8–
32U
NC
3A..
...
...
...
...
...
...
...
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...
0.11
40..
...
...
...
.
8–
32or
0.16
4–
32U
NC
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...
...
...
...
...
...
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...
0.13
89..
...
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...
.
10–
24or
0.19
0–
24U
NC
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...
...
...
...
...
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6..
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.
12–
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0.21
6–
32U
NEF
2A0.
0009
0.21
510.
2091
...
0.19
480.
1917
0.00
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...
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5 ⁄ 16
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or0.
3125
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UN
2A..
...
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2748
0.00
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...
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...
0.28
520.
0052
...
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...
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...
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390.
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5 ⁄ 16
–28
or0.
3125
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UN
2A..
...
...
...
...
.0.
2849
0.00
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...
...
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0.29
370.
0044
...
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...
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0.29
260.
0033
...
5 ⁄ 16
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or0.
3125
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UN
EF2A
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...
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800.
0032
...
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...
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2964
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980.
0024
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.0.
2847
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0.29
530.
0031
7 ⁄ 16
–16
or0.
4375
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UN
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or0.
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F1A
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...
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0.39
750.
0062
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7 ⁄ 16
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or0.
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EF2A
...
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3A..
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4147
0.00
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0–
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4419
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–16
or0.
5625
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3A..
...
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0.50
40..
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or0.
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2A..
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550.
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...
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...
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...
0.51
62..
.0.
5341
0.00
41..
.
ASME B1.1-2003 NONMANDATORY APPENDIX E
163
Tabl
eE-
1Li
mit
sas
List
edin
Tabl
e2
(For
mer
ly3A
)Pr
ior
toAS
ME
B1.
1-20
03Ed
itio
n(C
ont’
d)
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Min
orFu
ncti
onal
Dia
met
erU
NR
Min
orM
ajor
Maj
orD
iam
eter
[Not
e(1
)]D
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Min
.M
ax.
Min
.To
lera
nce
Max
.(R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
9 ⁄ 16
–24
or0.
5625
–24
UN
EF2A
...
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...
0.53
030.
0039
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...
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0.53
250.
0029
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...
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.0.
5392
0.00
38..
.
9 ⁄ 16
–32
or0.
5625
–32
UN
2A0.
0010
0.56
150.
5555
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120.
5377
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5467
0.00
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.
5 ⁄ 8–
11or
0.62
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NC
1A0.
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0.62
340.
6052
0.56
440.
5561
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...
...
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...
...
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0.00
160.
6234
0.61
13..
.0.
5644
0.55
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5 ⁄ 8–
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0.62
5–
32U
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.0.
590
...
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11⁄ 1
6–
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0.68
75–
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...
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0.62
640.
0054
...
2B..
...
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0.68
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...
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.0.
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0.00
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.
11⁄ 1
6–
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0.68
75–
20U
N2A
...
...
...
...
...
0.64
940.
0043
...
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...
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.0.
6606
0.00
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...
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0.65
180.
0032
...
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6412
...
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920.
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...
11⁄ 1
6–
24or
0.68
75–
24U
NEF
2A..
...
...
...
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...
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0.66
560.
0052
...
11⁄ 1
6–
28or
0.68
75–
28U
N3A
...
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...
...
0.66
150.
0028
...
3B..
...
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.
11⁄ 1
6–
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0.68
75–
32U
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...
...
...
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...
...
2B..
...
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.0.
6718
0.00
46..
.
3 ⁄ 4–
16or
0.75
0–
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NF
3A..
...
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...
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...
0.69
08..
...
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.
3 ⁄ 4–
20or
0.75
0–
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NEF
3A..
...
...
...
...
...
...
...
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...
0.70
37..
...
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.
3 ⁄ 4–
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0.75
0–
28U
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...
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0.70
743B
...
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0.81
25–
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0.75
120.
0055
...
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...
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...
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0.75
430.
0041
...
3B..
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13⁄ 1
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0.81
25–
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0.00
63..
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...
...
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0.76
830.
0036
...
3B..
.0.
7533
...
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0.00
47..
.
13⁄ 1
6–
20or
0.81
25–
20U
NEF
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570.
0057
...
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...
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62..
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13⁄ 1
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0.81
25–
28U
N2A
...
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0.78
430.
0038
...
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...
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...
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...
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.0.
7930
0.00
37..
.
NONMANDATORY APPENDIX E ASME B1.1-2003
标准下载网(www.bzxzw.com)
164
Tabl
eE-
1Li
mit
sas
List
edin
Tabl
e2
(For
mer
ly3A
)Pr
ior
toAS
ME
B1.
1-20
03Ed
itio
n(C
ont’
d)
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Min
orFu
ncti
onal
Dia
met
erU
NR
Min
orM
ajor
Maj
orD
iam
eter
[Not
e(1
)]D
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Min
.M
ax.
Min
.To
lera
nce
Max
.(R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
13⁄ 1
6–
32or
0.81
25–
32U
N2A
...
...
...
...
...
0.78
750.
0036
...
2B..
...
...
.0.
7969
0.00
47..
.3A
...
...
...
...
...
0.78
950.
0027
...
3B..
...
...
...
...
...
.
7 ⁄ 8–
12or
0.87
5–
12U
N2A
...
...
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...
...
0.81
370.
0055
...
2B..
...
...
.0.
8281
0.00
72..
.3A
...
...
...
...
...
0.81
68..
...
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...
0.79
48..
.0.
8263
0.00
54..
.
7 ⁄ 8–
14or
0.87
5–
14U
NF
1A..
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...
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...
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...
0.81
4..
...
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...
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814
...
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0.80
68..
...
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.
7 ⁄ 8–
16or
0.87
5–
16U
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...
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8407
0.00
63..
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...
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...
...
...
0.83
080.
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...
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.0.
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...
0.83
910.
0047
...
7 ⁄ 8–
20or
0.87
5–
20U
NEF
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8368
0.00
44..
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...
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0.84
820.
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...
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...
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...
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8392
0.00
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...
0.82
87..
.0.
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0.00
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.
7 ⁄ 8–
28or
0.87
5–
28U
N2A
...
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0.84
680.
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...
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0.00
50..
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...
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0.00
37..
.
7 ⁄ 8–
32or
0.87
5–
32U
N2A
...
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...
...
0.85
000.
0036
...
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...
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0.00
47..
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...
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...
...
0.85
200.
0027
...
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...
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...
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.
15⁄ 1
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0.93
75–
12U
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600.
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0041
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16U
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9034
0.00
65..
.3A
...
...
...
...
...
...
...
...
3B..
.0.
8783
...
0.90
180.
0049
...
15⁄ 1
6–
20or
0.93
75–
20U
NEF
3A..
...
...
...
...
...
...
...
.3B
...
0.89
12..
...
...
...
.
15⁄ 1
6–
28or
0.93
75–
28U
N2A
...
...
...
...
...
0.90
910.
0040
...
2B..
...
...
.0.
9195
0.00
52..
.3A
...
...
...
...
...
...
...
...
3B..
...
...
.0.
9182
0.00
39..
.
1–
8or
1.00
0–
8U
NC
2A..
...
...
...
...
.0.
9100
...
...
2B..
...
...
...
...
...
.
1–
14or
1.00
0–
14U
NS
2A0.
0017
0.99
830.
9880
...
0.95
190.
9463
0.00
56..
.2B
...
...
...
0.96
090.
0073
...
3A..
...
...
...
...
.0.
9494
0.00
42..
.3B
...
...
...
0.95
900.
0054
...
11 ⁄ 16
–12
or1.
0625
–12
UN
3A..
...
...
...
...
.1.
0042
0.00
42..
.3B
...
...
...
...
...
...
11 ⁄ 16
–16
or1.
0625
–16
UN
3A..
...
...
...
...
.1.
0182
0.00
37..
.3B
...
1.00
33..
...
...
...
.
ASME B1.1-2003 NONMANDATORY APPENDIX E
165
Tabl
eE-
1Li
mit
sas
List
edin
Tabl
e2
(For
mer
ly3A
)Pr
ior
toAS
ME
B1.
1-20
03Ed
itio
n(C
ont’
d)
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Min
orFu
ncti
onal
Dia
met
erU
NR
Min
orM
ajor
Maj
orD
iam
eter
[Not
e(1
)]D
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Min
.M
ax.
Min
.To
lera
nce
Max
.(R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
11 ⁄ 16
–18
or1.
0625
–18
UN
EF2A
...
...
...
...
...
1.02
030.
0047
...
2B..
...
...
...
...
...
.3A
...
...
...
...
...
...
...
...
3B..
...
...
.1.
0310
0.00
46..
.
11 ⁄ 16
–20
or1.
0625
–20
UN
2A..
...
...
...
...
.1.
0241
0.00
45..
.2B
...
...
...
...
...
...
3A..
...
...
...
...
...
...
...
.3B
...
1.01
62..
.1.
0344
0.00
44..
.
11 ⁄ 8–
7or
1.12
5–
7U
NC
2A..
...
...
...
...
...
.0.
0072
...
2B..
...
...
...
...
...
.
11 ⁄ 8–
16or
1.12
5–
16U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.1.
0909
0.00
65..
.3A
...
...
...
...
...
1.08
070.
0037
...
3B..
.1.
0658
...
...
...
...
11 ⁄ 8–
18or
1.12
5–
18U
NEF
2A..
...
...
...
...
.1.
0828
0.00
47..
.2B
...
...
...
...
...
...
3A..
...
...
...
...
...
...
...
.3B
...
...
...
1.09
350.
0046
...
11 ⁄ 8–
20or
1.12
5–
20U
N2A
...
...
...
...
...
1.08
660.
0045
...
2B..
...
...
.1.
0984
0.00
59..
.3A
...
...
...
...
...
1.08
910.
0034
...
3B..
.1.
0787
...
1.09
690.
0044
...
13 ⁄ 16
–12
or1.
1875
–12
UN
2A..
...
...
...
...
.1.
1259
0.00
58..
.2B
...
...
...
...
...
...
13 ⁄ 16
–16
or1.
1875
–16
UN
3A..
...
...
...
...
...
...
...
.3B
...
1.12
83..
.1.
1519
0.00
50..
.
13 ⁄ 16
–18
or1.
1875
–18
UN
EF2A
0.00
151.
1860
1.17
73..
.1.
1499
1.14
500.
0049
...
2B..
...
...
...
...
...
.
13 ⁄ 16
–20
or1.
1875
–20
UN
2A..
...
...
...
...
.1.
1489
0.00
47..
.2B
...
...
...
1.16
110.
0061
...
3A..
...
...
...
...
...
...
...
.3B
...
1.14
12..
...
...
...
.
11 ⁄ 4–
16or
1.25
0–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.1.
1908
...
...
...
...
11 ⁄ 4–
20or
1.25
0–
20U
N3A
...
...
...
...
...
...
...
...
3B..
.1.
2037
...
...
...
...
15 ⁄ 16
–12
or1.
3125
–12
UN
3A..
...
...
...
...
.1.
2541
0.00
45..
.3B
...
...
...
1.26
400.
0056
...
15 ⁄ 16
–16
or1.
3125
–16
UN
2A..
...
...
...
...
...
...
...
.2B
...
...
...
1.27
850.
0066
...
3A..
...
...
...
...
...
...
...
.3B
...
1.25
33..
...
...
...
.
15 ⁄ 16
–18
or1.
3125
–18
UN
EF2A
...
...
...
...
...
...
...
...
2B..
...
...
.1.
2827
0.00
63..
.3A
...
...
...
...
...
1.27
280.
0038
...
3B..
...
...
.1.
2811
0.00
47..
.
15 ⁄ 16
–20
or1.
3125
–20
UN
3A..
...
...
...
...
...
...
...
.3B
...
1.26
62..
.1.
2845
0.00
45..
.
15 ⁄ 16
–28
or1.
3125
–28
UN
2A..
...
...
...
...
...
...
...
.2B
...
...
...
1.29
460.
0053
...
NONMANDATORY APPENDIX E ASME B1.1-2003
标准下载网(www.bzxzw.com)
166
Tabl
eE-
1Li
mit
sas
List
edin
Tabl
e2
(For
mer
ly3A
)Pr
ior
toAS
ME
B1.
1-20
03Ed
itio
n(C
ont’
d)
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Min
orFu
ncti
onal
Dia
met
erU
NR
Min
orM
ajor
Maj
orD
iam
eter
[Not
e(1
)]D
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Min
.M
ax.
Min
.To
lera
nce
Max
.(R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
13 ⁄ 8–
16or
1.37
5–
16U
N2A
...
...
...
...
...
1.32
780.
0051
...
2B..
...
...
.1.
3410
0.00
66..
.3A
...
...
...
...
...
...
...
...
3B..
.1.
3158
...
...
...
...
13 ⁄ 8–
18or
1.37
5–
18U
NEF
2A..
...
...
...
...
...
...
...
.2B
...
...
...
1.34
520.
0063
...
3A..
...
...
...
...
.1.
3353
0.00
36..
.3B
...
...
...
1.34
360.
0047
...
13 ⁄ 8–
20or
1.37
5–
20U
N3A
...
...
...
...
...
...
...
...
3B..
.1.
3287
...
1.34
700.
0045
...
13 ⁄ 8–
28or
1.37
5–
28U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.1.
3571
0.00
53..
.
17 ⁄ 16
–16
or1.
4375
–16
UN
2A..
...
...
...
...
...
...
...
.2B
...
...
...
1.40
370.
0068
...
3A..
...
...
...
...
...
...
...
.3B
...
1.37
83..
...
...
...
.
17 ⁄ 16
–18
or1.
4375
–18
UN
EF2A
...
...
...
...
...
1.39
490.
0050
...
2B..
...
...
...
...
...
.
17 ⁄ 16
–20
or1.
4375
–20
UN
2A..
...
...
...
...
.1.
3988
0.00
48..
.2B
...
...
...
...
...
...
3A..
...
...
...
...
...
...
...
.3B
...
1.39
12..
...
...
...
.
17 ⁄ 16
–28
or1.
4375
–28
UN
2A..
...
...
...
...
...
...
...
.2B
...
...
...
1.41
980.
0055
...
11 ⁄ 2–
16or
1.50
0–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.1.
4408
...
...
...
...
11 ⁄ 2–
18or
1.50
0–
18U
NEF
2A..
...
...
...
...
...
...
...
.2B
...
1.45
2..
...
...
...
.11 ⁄ 2
–20
or1.
500
–20
3A..
...
...
...
...
...
...
...
.3B
...
1.45
37..
...
...
...
.
19 ⁄ 16
–12
or1.
5625
–12
UN
2A..
...
...
...
...
...
...
...
.2B
...
...
...
1.51
600.
0076
...
3A..
...
...
...
...
...
...
...
.3B
...
...
...
1.51
410.
0057
...
19 ⁄ 16
–16
or1.
5625
–16
UN
3A..
...
...
...
...
...
...
...
.3B
...
1.50
33..
...
...
...
.
19 ⁄ 16
–18
or1.
5625
–18
UN
EF3A
...
...
...
...
...
...
...
...
3B..
...
...
.1.
5312
0.00
48..
.
19 ⁄ 16
–20
or1.
5625
–20
UN
3A..
...
...
...
...
...
...
...
.3B
...
1.51
62..
.1.
5346
0.00
46..
.
15 ⁄ 8–
12or
1.62
5–
12U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.1.
5785
0.00
76..
.3A
...
...
...
...
...
...
...
...
3B..
...
...
.1.
5766
0.00
57..
.
15 ⁄ 8–
16or
1.62
5–
16U
N2A
...
...
...
...
...
1.57
760.
0052
...
2B..
...
...
...
...
...
.
15 ⁄ 8–
18or
1.62
5–
18U
N3A
...
...
...
...
...
1.58
520.
0037
...
3B..
...
...
.1.
5937
0.00
48..
.
15 ⁄ 8–
20or
1.62
5–
20U
N3A
...
...
...
...
...
...
...
...
3B..
.1.
5787
...
1.59
710.
0046
...
ASME B1.1-2003 NONMANDATORY APPENDIX E
167
Tabl
eE-
1Li
mit
sas
List
edin
Tabl
e2
(For
mer
ly3A
)Pr
ior
toAS
ME
B1.
1-20
03Ed
itio
n(C
ont’
d)
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Min
orFu
ncti
onal
Dia
met
erU
NR
Min
orM
ajor
Maj
orD
iam
eter
[Not
e(1
)]D
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Min
.M
ax.
Min
.To
lera
nce
Max
.(R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
111⁄ 1
6–
12or
1.68
75–
12U
N2A
...
...
...
...
...
1.62
560.
0060
...
2B..
...
...
.1.
6412
0.00
76..
.
111⁄ 1
6–
16or
1.68
75–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.1.
6283
...
1.65
210.
0052
...
111⁄ 1
6–
18or
1.68
75–
18U
NEF
2A..
...
...
...
...
.1.
6448
0.00
51..
.2B
...
...
...
1.65
800.
0066
...
111⁄ 1
6–
20or
1.68
75–
20U
N2A
0.00
151.
6860
1.67
79..
.1.
6535
1.64
87..
...
.2B
...
...
...
...
...
...
3A..
...
...
...
...
...
...
...
.3B
...
1.64
12..
...
...
...
.
13 ⁄ 4–
5or
1.75
0–
5U
NC
1A..
...
...
...
...
...
...
...
.1B
1.53
41.
568
...
...
...
...
2A..
...
...
...
...
...
...
...
.2B
1.53
41.
568
...
...
...
...
3A..
...
...
...
...
...
...
...
.3B
1.53
40..
...
...
...
...
.
13 ⁄ 4–
8or
1.75
0–
8U
N3A
...
...
...
...
...
1.66
320.
0056
...
3B..
...
...
...
...
...
.
13 ⁄ 4–
16or
1.75
0–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.1.
6908
...
...
...
...
13 ⁄ 4–
20or
1.75
0–
20U
N3A
...
...
...
...
...
...
...
...
3B..
.1.
7037
...
...
...
...
113⁄ 1
6–
16or
1.81
25–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.1.
7533
...
...
...
...
113⁄ 1
6–
20or
1.81
25–
20U
N3A
...
...
...
...
...
1.77
640.
0036
...
3B..
.1.
7662
...
...
...
...
17 ⁄ 8–
12or
1.87
5–
12U
N3A
...
...
...
...
...
...
...
...
3B..
...
...
.1.
8267
0.00
58..
.
17 ⁄ 8–
16or
1.87
5–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.1.
8158
...
...
...
...
17 ⁄ 8–
20or
1.87
5–
20U
N2A
...
...
...
...
...
1.83
620.
0048
...
2B..
...
...
.1.
8488
0.00
63..
.3A
...
...
...
...
...
1.83
890.
0036
...
3B..
.1.
8287
...
1.84
720.
0047
...
115⁄ 1
6–
12or
1.93
75–
12U
N2A
...
...
...
...
...
1.87
550.
0061
...
2B..
...
...
.1.
8913
0.00
79..
.
115⁄ 1
6–
16or
1.93
75–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.1.
8785
...
...
...
...
115⁄ 1
6–
20or
1.93
75–
20U
N3A
...
...
...
...
...
...
...
...
3B..
.1.
8912
...
...
...
...
2–
16or
2.00
0–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.1.
9408
...
...
...
...
2–
20or
2.00
0–
20U
N3A
...
...
...
...
...
...
...
...
3B..
.1.
9537
...
...
...
...
21 ⁄ 8–
12or
2.12
50–
12U
N3A
...
...
...
...
...
2.06
640.
0045
...
3B..
...
...
...
...
...
.
NONMANDATORY APPENDIX E ASME B1.1-2003
标准下载网(www.bzxzw.com)
168
Tabl
eE-
1Li
mit
sas
List
edin
Tabl
e2
(For
mer
ly3A
)Pr
ior
toAS
ME
B1.
1-20
03Ed
itio
n(C
ont’
d)
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Min
orFu
ncti
onal
Dia
met
erU
NR
Min
orM
ajor
Maj
orD
iam
eter
[Not
e(1
)]D
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Min
.M
ax.
Min
.To
lera
nce
Max
.(R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
21 ⁄ 8–
16or
2.12
50–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.2.
0658
...
2.08
960.
0052
...
21 ⁄ 8–
20or
2.12
50–
20U
N2A
...
...
...
...
...
2.08
610.
0049
...
2B..
...
...
.2.
0989
0.00
64..
.3A
...
...
...
...
...
...
...
...
3B..
.2.
0787
...
...
...
...
21 ⁄ 4–
12or
2.25
0–
12U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.2.
2038
0.00
79..
.3A
...
...
...
...
...
2.19
140.
0045
...
3B..
...
...
.2.
2018
0.00
59..
.
21 ⁄ 4–
16or
2.25
0–
16U
N2A
...
...
...
...
...
2.20
240.
0054
...
2B..
...
...
.2.
2164
0.00
70..
.3A
...
...
...
...
...
...
...
...
3B..
.2.
1908
...
2.21
460.
0052
...
21 ⁄ 4–
20or
2.25
0–
20U
N2A
...
...
...
...
...
2.21
110.
0049
...
2B..
...
...
.2.
2239
0.00
64..
.3A
...
...
...
...
...
...
...
...
3B..
.2.
2037
...
2.22
230.
0048
...
23 ⁄ 8–
6or
2.37
50–
6U
N2A
...
...
...
...
...
...
...
...
2B..
.2.
226
...
...
...
...
23 ⁄ 8–
12or
2.37
50–
12U
N2A
0.00
192.
3731
2.36
17..
.2.
3190
2.31
28..
...
.2B
...
...
...
2.32
900.
0081
...
23 ⁄ 8–
16or
2.37
50–
16U
N2A
0.00
172.
3733
2.36
39..
.2.
3327
2.32
72..
...
.2B
...
...
...
2.34
160.
0072
...
3A..
...
...
...
...
...
...
...
.3B
...
2.31
58..
...
...
...
.
23 ⁄ 8–
20or
2.37
50–
20U
N2A
...
...
...
...
...
2.33
590.
0051
...
2B..
...
...
...
...
...
.3A
...
...
...
...
...
...
...
...
3B..
.2.
3287
...
2.34
750.
0050
...
21 ⁄ 2–
16or
2.50
0–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.2.
4408
...
...
...
...
21 ⁄ 2–
20or
2.50
0–
20U
N3A
...
...
...
...
...
...
...
...
3B..
.2.
4537
...
...
...
...
25 ⁄ 8–
12or
2.62
5–
12U
N3A
...
...
...
...
...
2.56
630.
0046
...
3B..
...
...
.2.
5769
0.00
60..
.
25 ⁄ 8–
16or
2.62
5–
16U
N2A
...
...
...
...
...
2.57
720.
0055
...
2B..
...
...
...
...
...
.3A
...
...
...
...
...
2.58
030.
0041
...
3B..
.2.
5658
...
...
...
...
25 ⁄ 8–
20or
2.62
5–
20U
N3A
...
...
...
...
...
...
...
...
3B..
.2.
5784
...
...
...
...
23 ⁄ 4–
12or
2.75
0–
12U
N2A
...
...
...
...
...
2.68
780.
0062
...
2B..
...
...
...
...
...
.3A
...
...
...
...
...
2.69
130.
0046
...
3B..
...
...
.2.
7019
0.00
60..
.
23 ⁄ 4–
16or
2.75
0–
16U
N2A
...
...
...
...
...
2.70
220.
0055
...
2B..
...
...
.2.
7166
0.00
72..
.3A
...
...
...
...
...
2.70
530.
0041
...
3B..
.2.
6908
...
...
...
...
ASME B1.1-2003 NONMANDATORY APPENDIX E
169
Tabl
eE-
1Li
mit
sas
List
edin
Tabl
e2
(For
mer
ly3A
)Pr
ior
toAS
ME
B1.
1-20
03Ed
itio
n(C
ont’
d)
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Min
orFu
ncti
onal
Dia
met
erU
NR
Min
orM
ajor
Maj
orD
iam
eter
[Not
e(1
)]D
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Min
.M
ax.
Min
.To
lera
nce
Max
.(R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
23 ⁄ 4–
20or
2.75
0–
20U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.2.
7241
0.00
66..
.3A
...
...
...
...
...
2.71
370.
0038
...
3B..
.2.
7037
...
...
...
...
27 ⁄ 8–
12or
2.87
5–
12U
N3A
...
...
...
...
...
...
...
...
3B..
...
...
.2.
8271
0.00
62..
.
27 ⁄ 8–
16or
2.87
5–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.2.
8158
...
...
...
...
27 ⁄ 8–
20or
2.87
5–
20U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.2.
8493
0.00
68..
.3A
...
...
...
...
...
...
...
...
3B..
.2.
8287
...
2.84
760.
0051
...
3–
16or
3.00
0–
16U
N2A
...
...
...
...
...
...
0.00
56..
.2B
...
...
...
...
...
...
3A..
...
...
...
...
...
...
...
.3B
...
2.94
08..
...
...
...
.
3–
20or
3.00
0–
20U
N3A
...
...
...
...
...
...
...
...
3B..
.2.
9537
...
...
...
...
31 ⁄ 8–
12or
3.12
5–
12U
N2A
...
...
...
...
...
3.06
270.
0063
...
2B..
...
...
.3.
0791
0.00
82..
.3A
...
...
...
...
...
3.06
620.
0047
...
3B..
...
...
...
...
...
.
31 ⁄ 8–
16or
3.12
5–
16U
N2A
...
...
...
...
...
3.07
710.
0056
...
2B..
...
...
.3.
0917
0.00
73..
.3A
...
...
...
...
...
3.08
020.
0042
...
3B..
.3.
0658
...
...
...
...
31 ⁄ 4–
12or
3.25
0–
12U
N2A
...
...
...
...
...
3.18
770.
0063
...
2B..
...
...
.3.
2041
0.00
82..
.3A
...
...
...
...
...
3.19
120.
0047
...
3B..
...
...
...
...
...
.
31 ⁄ 4–
16or
3.25
0–
16U
N2A
...
...
...
...
...
3.20
210.
0056
...
2B..
...
...
.3.
2167
0.00
73..
.3A
...
...
...
...
...
3.20
520.
0042
...
3B..
.3.
1908
...
3.21
490.
0055
...
33 ⁄ 8–
12or
3.37
5–
12U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.3.
3293
0.00
84..
.
33 ⁄ 8–
16or
3.37
5–
16U
N2A
...
...
...
...
...
3.32
690.
0058
...
2B..
...
...
...
...
...
.3A
...
...
...
...
...
...
...
...
3B..
.3.
3158
...
...
...
...
31 ⁄ 2–
16or
3.50
0–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.3.
4408
...
...
...
...
35 ⁄ 8–
12or
3.62
5–
12U
N2A
...
...
...
...
...
3.56
260.
0064
...
2B..
...
...
...
...
...
.
35 ⁄ 8–
16or
3.62
5–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.3.
5658
...
...
...
...
33 ⁄ 4–
12or
3.75
0–
12U
N2A
...
...
...
...
...
3.68
760.
0064
...
2B..
...
...
...
...
...
.3A
...
...
...
...
...
3.69
110.
0048
...
3B..
...
...
...
...
...
.
NONMANDATORY APPENDIX E ASME B1.1-2003
标准下载网(www.bzxzw.com)
170
Tabl
eE-
1Li
mit
sas
List
edin
Tabl
e2
(For
mer
ly3A
)Pr
ior
toAS
ME
B1.
1-20
03Ed
itio
n(C
ont’
d)
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Min
orFu
ncti
onal
Dia
met
erU
NR
Min
orM
ajor
Maj
orD
iam
eter
[Not
e(1
)]D
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Min
.M
ax.
Min
.To
lera
nce
Max
.(R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
33 ⁄ 4–
16or
3.75
0–
16U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.3.
7169
0.00
75..
.3A
...
...
...
...
...
3.70
510.
0043
...
3B..
.3.
6908
...
3.71
500.
0056
...
37 ⁄ 8–
16or
3.87
5–
16U
N2A
...
...
...
...
...
3.82
670.
0059
...
2B..
...
...
...
...
...
.3A
...
...
...
...
...
...
...
...
3B..
.3.
8158
...
...
...
...
4–
16or
4.00
0–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.3.
9408
...
...
...
...
41 ⁄ 8–
12or
4.12
5–
12U
N2A
...
...
...
...
...
4.06
240.
0065
...
2B..
...
...
...
...
...
.
41 ⁄ 8–
16or
4.12
5–
16U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.4.
0920
0.00
76..
.3A
...
...
...
...
...
...
...
...
3B..
.4.
0658
...
...
...
...
41 ⁄ 4–
8or
4.25
0–
8U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.4.
1808
0.01
20..
.3A
...
...
...
...
...
...
...
...
3B..
...
...
.4.
1779
0.00
91..
.
41 ⁄ 4–
12or
4.25
0–
12U
N2A
...
...
...
...
...
4.18
740.
0065
...
2B..
...
...
.4.
2044
0.00
85..
.
41 ⁄ 4–
16or
4.25
0–
16U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.4.
2170
0.00
76..
.3A
...
...
...
...
...
...
...
...
3B..
.4.
1908
...
4.21
510.
0057
...
43 ⁄ 8–
8or
4.37
5–
8U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.4.
3058
0.01
20..
.
43 ⁄ 8–
12or
4.37
5–
12U
N2A
...
...
...
...
...
4.31
240.
0065
...
2B..
...
...
.4.
3294
0.00
85..
.3A
...
...
...
...
...
4.31
600.
0049
...
3B..
...
...
...
...
...
.
43 ⁄ 8–
16or
4.37
5–
16U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.4.
3420
0.00
76..
.3A
...
...
...
...
...
4.33
000.
0044
...
3B..
.4.
3158
...
4.34
010.
0057
...
41 ⁄ 2–
12or
4.50
0–
12U
N2A
...
...
...
...
...
4.43
740.
0065
...
2B..
...
...
.4.
4544
0.00
85..
.3A
...
...
...
...
...
4.44
100.
0049
...
3B..
...
...
.4.
4523
0.00
64..
.
41 ⁄ 2–
16or
4.50
0–
16U
N2A
...
...
...
...
...
4.45
170.
0059
...
2B..
...
...
.4.
4670
0.00
76..
.3A
...
...
...
...
...
4.45
500.
0044
...
3B..
.4.
4408
...
4.46
510.
0057
...
45 ⁄ 8–
8or
4.62
5–
8U
N2A
0.00
294.
6221
4.60
71..
.4.
5409
4.53
14..
...
.2B
...
...
...
4.55
620.
0124
...
3A..
...
...
...
...
...
...
...
.3B
...
...
...
4.55
310.
0093
...
45 ⁄ 8–
16or
4.62
5–
16U
N2A
...
...
...
...
...
4.57
650.
0061
...
2B..
...
...
.4.
5923
0.00
79..
.3A
...
...
...
...
...
...
...
...
3B..
.4.
5658
...
4.59
030.
0059
...
43 ⁄ 4–
8or
4.75
0–
8U
N3A
...
...
...
...
...
4.66
170.
0071
...
3B..
...
...
...
...
...
.
ASME B1.1-2003 NONMANDATORY APPENDIX E
171
Tabl
eE-
1Li
mit
sas
List
edin
Tabl
e2
(For
mer
ly3A
)Pr
ior
toAS
ME
B1.
1-20
03Ed
itio
n(C
ont’
d)
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Min
orFu
ncti
onal
Dia
met
erU
NR
Min
orM
ajor
Maj
orD
iam
eter
[Not
e(1
)]D
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Min
.M
ax.
Min
.To
lera
nce
Max
.(R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
43 ⁄ 4–
12or
4.75
0–
12U
N3A
...
...
...
...
...
...
...
...
3B..
...
...
.4.
7025
0.00
66..
.
43 ⁄ 4–
16or
4.75
0–
16U
N2A
...
...
...
...
...
4.70
150.
0059
...
2B..
...
...
.4.
7173
0.00
79..
.3A
...
...
...
...
...
...
...
...
3B..
.4.
6908
...
...
...
...
47 ⁄ 8–
12or
4.87
5–
12U
N3A
...
...
...
...
...
...
...
...
3B..
...
...
.4.
8275
0.00
66..
.
47 ⁄ 8–
16or
4.87
5–
16U
N2A
...
...
...
...
...
4.82
650.
0061
...
2B..
...
...
.4.
8423
0.00
79..
.3A
...
...
...
...
...
...
...
...
3B..
.4.
8158
...
...
...
...
5–
8or
5.00
0–
8U
N3A
...
...
...
...
...
...
...
...
3B..
...
...
.4.
9283
0.00
95..
.
5–
16or
5.00
0–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.4.
9408
...
...
...
...
51 ⁄ 8–
8or
5.12
5–
8U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.5.
0564
0.01
26..
.
51 ⁄ 8–
12or
5.12
5–
12U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.5.
0796
0.00
87..
.3A
...
...
...
...
...
5.06
590.
0050
...
3B..
...
...
...
...
...
.
51 ⁄ 8–
16or
5.12
5–
16U
N3A
...
...
...
...
...
5.07
990.
0045
...
3B..
.5.
0658
...
...
...
...
51 ⁄ 4–
8or
5.25
0–
8U
N3A
...
...
...
...
...
5.16
140.
0074
...
3B..
...
...
.5.
1784
0.00
96..
.
51 ⁄ 4–
12or
5.25
0–
12U
N2A
...
...
...
...
...
5.18
720.
0067
...
2B..
...
...
.5.
2046
0.00
87..
.3A
...
...
...
...
...
5.19
090.
0050
...
3B..
...
...
...
...
...
.
51 ⁄ 4–
16or
5.25
0–
16U
N3A
...
...
...
...
...
5.20
490.
0047
...
3B..
...
...
...
...
...
.
53 ⁄ 8–
8or
5.37
5–
8U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.5.
3067
0.01
29..
.3A
...
...
...
...
...
...
...
...
3B..
...
...
.5.
3035
0.00
97..
.
53 ⁄ 8–
12or
5.37
5–
12U
N2A
...
...
...
...
...
5.31
220.
0067
...
2B..
...
...
.5.
3296
0.00
87..
.3A
...
...
...
...
...
5.31
590.
0050
...
3B..
...
...
...
...
...
.
53 ⁄ 8–
16or
5.37
5–
16U
N3A
...
...
...
...
...
5.32
990.
0045
...
3B..
.5.
3158
...
5.34
030.
0059
...
51 ⁄ 2–
12or
5.50
0–
12U
N2A
...
...
...
...
...
5.43
720.
0067
...
2B..
...
...
.5.
4546
0.00
87..
.3A
...
...
...
...
...
5.44
090.
0050
...
3B..
...
...
...
...
...
.
51 ⁄ 2–
16or
5.50
0–
16U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.5.
4673
0.00
79..
.3A
...
...
...
...
...
5.45
490.
0045
...
3B..
.5.
4408
...
5.46
530.
0059
...
NONMANDATORY APPENDIX E ASME B1.1-2003
标准下载网(www.bzxzw.com)
172
Tabl
eE-
1Li
mit
sas
List
edin
Tabl
e2
(For
mer
ly3A
)Pr
ior
toAS
ME
B1.
1-20
03Ed
itio
n(C
ont’
d)
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Min
orFu
ncti
onal
Dia
met
erU
NR
Min
orM
ajor
Maj
orD
iam
eter
[Not
e(1
)]D
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Min
.M
ax.
Min
.To
lera
nce
Max
.(R
ef.)
Clas
sM
in.
Max
.M
in.
Max
.To
lera
nce
Min
.
55 ⁄ 8–
8or
5.62
5–
8U
N3A
...
...
...
...
...
...
...
...
3B..
...
...
.5.
5536
0.00
98..
.
55 ⁄ 8–
12or
5.62
5–
12U
N2A
0.00
215.
6229
5.61
15..
.5.
5688
5.56
190.
0069
...
2B..
...
...
.5.
5799
0.00
90..
.3A
...
...
...
...
...
5.56
570.
0052
...
3B..
...
...
...
...
...
.
55 ⁄ 8–
16or
5.62
5–
16U
N2A
0.00
195.
6231
5.61
37..
.5.
5825
5.57
63..
...
.2B
...
...
...
5.59
250.
0081
...
3A..
...
...
...
...
.5.
5797
0.00
47..
.3B
...
5.56
58..
.5.
5905
0.00
61..
.
53 ⁄ 4–
8or
5.75
0–
8U
N2A
...
...
5.72
50..
...
...
...
...
.2B
...
...
...
...
...
...
53 ⁄ 4–
12or
5.75
0–
12U
N2A
...
...
...
...
...
5.68
690.
0069
...
2B..
...
...
.5.
7049
0.00
90..
.3A
...
...
...
...
...
5.69
070.
0052
...
3B..
...
...
...
...
...
.
53 ⁄ 4–
16or
5.75
0–
16U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.5.
7175
0.00
81..
.3A
...
...
...
...
...
5.70
470.
0047
...
3B..
.5.
6908
...
5.71
550.
0061
...
57 ⁄ 8–
8or
5.87
5–
8U
N2A
0.00
315.
8719
5.85
69..
.5.
7907
5.78
06..
...
.2B
...
...
...
...
...
...
57 ⁄ 8–
12or
5.87
5–
12U
N2A
...
...
...
...
...
...
...
...
2B..
...
...
.5.
8299
0.00
90..
.
57 ⁄ 8–
16or
5.87
5–
16U
N3A
...
...
...
...
...
5.82
970.
0047
...
3B..
.5.
8158
...
5.84
050.
0061
...
6–
8or
6.00
0–
8U
N2A
0.00
315.
9969
5.98
19..
.5.
9157
5.90
55..
...
.2B
...
...
...
5.93
210.
0131
...
3A..
...
...
...
...
.5.
9111
0.00
77..
.3B
...
...
...
5.92
870.
0099
...
6–
16or
6.00
0–
16U
N3A
...
...
...
...
...
...
...
...
3B..
.5.
9408
...
...
...
...
GEN
ERA
LN
OTE
S:
(a)
The
limit
slis
ted
inth
isTa
ble
are
nolo
nger
cons
ider
edst
anda
rdan
dar
efo
rin
form
atio
non
ly.
They
have
been
repl
aced
beca
use
ofca
lcul
atio
ner
rors
and
ach
ange
inro
undi
ngm
etho
ds.
(b)
Prod
uct
thre
ads,
gage
s,or
tool
ing
that
conf
orm
orw
ere
gene
rate
dus
ing
limit
slis
ted
inth
isTa
ble
shou
ldbe
cons
ider
edac
cept
able
.W
hen
repl
acin
g,th
ene
wlim
its
shou
ldbe
used
.(c
)It
isre
com
men
ded
that
all
user
spr
epar
efo
rth
eev
entu
alad
opti
onof
only
the
valu
esin
Tabl
e2.
NO
TE:
(1)
See
para
.5.
2.1
for
Func
tion
alD
iam
eter
.
ASME B1.1-2003 NONMANDATORY APPENDIX E
173
Tabl
eE-
2Li
mit
sas
List
edin
Tabl
eD
-1(F
orm
erly
3B)P
rior
toAS
ME
B1.
1-20
03Ed
itio
n
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Func
tion
alD
iam
eter
UN
RM
inor
Maj
orM
ajor
Dia
met
er[N
ote
(1)]
Min
orD
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Max
.M
in.
Tole
ranc
eM
ax.
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
Tole
ranc
eM
in.
10–
28or
0.19
0–
28U
NS
2A..
...
...
...
...
...
.0.
1464
2B..
...
...
...
...
...
.
10–
36or
0.19
0–
36U
NS
2A..
...
...
...
...
...
...
.2B
...
0.16
6..
...
...
...
.
10–
40or
0.19
0–
40U
NS
2A..
...
...
...
...
...
.0.
1592
2B..
...
...
...
...
...
.
10–
48or
0.19
0–
48U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
10–
56or
0.19
0–
56U
NS
2A..
...
...
...
...
...
.0.
1681
2B..
...
...
...
...
...
.
12–
36or
0.21
6–
36U
NS
2A..
...
...
...
...
...
.0.
1821
2B..
.0.
192
...
...
...
...
12–
40or
0.21
6–
40U
NS
2A..
...
...
...
...
...
.0.
1835
2B..
...
...
.0.
2035
0.00
37..
.
12–
48or
0.21
6–
48U
NS
2A..
...
...
...
.0.
1991
0.00
26..
.2B
...
...
...
0.20
590.
0034
...
12–
56or
0.21
6–
56U
NS
2A0.
0007
0.21
530.
2112
0.20
370.
2012
...
0.19
412B
...
...
...
0.20
760.
0032
...
1 ⁄ 4–
24or
0.25
0–
24U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
1 ⁄ 4–
27or
0.25
0–
27U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
1 ⁄ 4–
36or
0.25
0–
36U
NS
2A..
...
...
...
...
...
.0.
2161
2B..
.0.
226
...
...
...
...
1 ⁄ 4–
40or
0.25
0–
40U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
1 ⁄ 4–
48or
0.25
0–
48U
NS
2A..
...
...
...
...
...
.0.
2243
2B..
...
...
...
...
...
.
1 ⁄ 4–
56or
0.25
0–
56U
NS
2A..
...
...
...
...
...
.0.
2280
2B..
...
...
...
...
...
.
5 ⁄ 16
–27
or0.
3125
–27
UN
S2A
0.00
100.
3115
0.30
480.
2874
0.28
390.
0035
0.26
742B
...
...
...
0.29
290.
0045
...
5 ⁄ 16
–36
or0.
3125
–36
UN
S2A
...
...
...
...
...
...
...
2B..
...
...
.0.
2985
0.00
40..
.
5 ⁄ 16
–40
or0.
3125
–40
UN
S2A
...
...
...
...
0.29
250.
0029
...
2B..
...
...
.0.
3001
0.00
38..
.
5 ⁄ 16
–48
or0.
3125
–48
UN
S2A
...
...
...
...
0.29
550.
0027
...
2B..
...
...
...
...
...
.
3 ⁄ 8–
18or
0.37
5–
18U
NS
2A..
...
...
...
...
...
.0.
3076
2B..
...
...
...
...
...
.
3 ⁄ 8–
27or
0.37
5–
27U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
NONMANDATORY APPENDIX E ASME B1.1-2003
标准下载网(www.bzxzw.com)
174
Tabl
eE-
2Li
mit
sas
List
edin
Tabl
eD
-1(F
orm
erly
3B)P
rior
toAS
ME
B1.
1-20
03Ed
itio
n(C
ont’
d)
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Func
tion
alD
iam
eter
UN
RM
inor
Maj
orM
ajor
Dia
met
er[N
ote
(1)]
Min
orD
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Max
.M
in.
Tole
ranc
eM
ax.
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
Tole
ranc
eM
in.
3 ⁄ 8–
36or
0.37
5–
36U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
3 ⁄ 8–
40or
0.37
5–
40U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
0.39
0–
27or
0.39
0–
27U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
7 ⁄ 16
–18
or0.
4375
–18
UN
S2A
...
...
...
...
0.39
580.
0043
0.37
012B
...
...
...
0.40
700.
0056
...
7 ⁄ 16
–24
or0.
4375
–24
UN
S2A
0.00
110.
4364
0.42
920.
4093
0.40
550.
0038
0.38
682B
...
...
...
0.41
530.
0049
...
7 ⁄ 16
–27
or0.
4375
–27
UN
S2A
...
...
...
...
0.40
870.
0036
...
2B..
...
...
.0.
4181
0.00
47..
.
1 ⁄ 2–
12or
0.50
0–
12U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
3A..
...
...
...
...
...
...
.3B
...
0.42
2..
...
...
...
.
1 ⁄ 2–
14or
0.50
0–
14U
NS
2A..
...
...
...
...
...
.0.
4135
2B..
...
...
...
...
...
.
1 ⁄ 2–
18or
0.50
0–
18U
NS
2A..
...
...
...
...
...
.0.
4326
2B..
...
...
...
...
...
.
1 ⁄ 2–
24or
0.50
0–
24U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
1 ⁄ 2–
27or
0.50
0–
27U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
9 ⁄ 16
–14
or0.
5625
–14
UN
S2A
...
...
...
...
...
...
0.47
602B
...
...
...
...
...
...
9 ⁄ 16
–27
or0.
5625
–27
UN
S2A
...
...
...
...
0.53
360.
0037
...
2B..
...
...
.0.
5432
0.00
48..
.
5 ⁄ 8–
14or
0.62
5–
14U
NS
2A..
...
...
...
...
...
.0.
5385
2B..
.0.
564
...
...
...
...
5 ⁄ 8–
27or
0.62
5–
27U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
3 ⁄ 4–
14or
0.75
0–
14U
NS
2A..
...
...
...
...
...
.0.
6635
2B..
...
...
...
...
...
.
3 ⁄ 4–
18or
0.75
0–
18U
NS
2A..
...
...
...
...
...
.0.
6825
2B..
...
...
...
...
...
.
3 ⁄ 4–
24or
0.75
0–
24U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
3 ⁄ 4–
27or
0.75
0–
27U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
7 ⁄ 8–
10or
0.87
5–
10U
NS
2A..
...
...
...
.0.
8022
0.00
600.
7542
2B..
...
...
.0.
8178
0.00
78..
.
ASME B1.1-2003 NONMANDATORY APPENDIX E
175
Tabl
eE-
2Li
mit
sas
List
edin
Tabl
eD
-1(F
orm
erly
3B)P
rior
toAS
ME
B1.
1-20
03Ed
itio
n(C
ont’
d)
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Func
tion
alD
iam
eter
UN
RM
inor
Maj
orM
ajor
Dia
met
er[N
ote
(1)]
Min
orD
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Max
.M
in.
Tole
ranc
eM
ax.
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
Tole
ranc
eM
in.
7 ⁄ 8–
18or
0.87
5–
18U
NS
2A..
...
...
...
.0.
8329
0.00
460.
8075
2B..
...
...
.0.
8449
0.00
60..
.
7 ⁄ 8–
24or
0.87
5–
24U
NS
2A..
...
...
...
.0.
8426
0.00
41..
.2B
...
...
...
0.85
320.
0052
...
7 ⁄ 8–
27or
0.87
5–
27U
NS
2A..
...
...
...
.0.
8458
0.00
39..
.2B
...
...
...
0.85
600.
0051
...
1–
10or
1.00
0–
10U
NS
2A..
...
...
...
...
...
.0.
8792
2B..
...
...
...
...
...
.
1–
18or
1.00
0–
18U
NS
2A..
...
...
...
...
...
.0.
9325
2B..
...
...
...
...
...
.
1–
24or
1.00
0–
24U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
1–
27or
1.00
0–
27U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
11 ⁄ 8–
10or
1.12
5–
10U
NS
2A0.
0018
1.12
321.
1103
1.05
821.
0520
...
1.00
422B
...
...
...
1.06
800.
0080
...
11 ⁄ 8–
14or
1.12
5–
14U
NS
2A..
...
...
...
...
...
.1.
0384
2B..
.1.
064
...
...
...
...
11 ⁄ 8–
24or
1.12
5–
24U
NS
2A..
...
...
...
.1.
0924
0.00
421.
0742
2B..
...
...
.1.
1034
0.00
55..
.
11 ⁄ 4–
10or
1.25
0–
10U
NS
2A..
...
...
...
...
...
.1.
1291
2B..
...
...
...
...
...
.
11 ⁄ 4–
14or
1.25
0–
14U
NS
2A..
...
...
...
...
...
.1.
1634
2B..
...
...
...
...
...
.
11 ⁄ 4–
24or
1.25
0–
24U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
13 ⁄ 8–
10or
1.37
5–
10U
NS
2A..
...
...
...
...
...
.1.
2541
2B..
...
...
...
...
...
.
13 ⁄ 8–
14or
1.37
5–
14U
NS
2A..
...
...
...
.1.
3216
0.00
541.
2884
2B..
.1.
314
...
1.33
560.
0070
...
13 ⁄ 8–
24or
1.37
5–
24U
NS
2A..
...
...
...
.1.
3423
0.00
43..
.2B
...
...
...
1.35
350.
0056
...
11 ⁄ 2–
10or
1.50
0–
10U
NS
2A..
...
...
...
...
...
.1.
3791
2B..
...
...
...
...
...
.
11 ⁄ 2–
14or
1.50
0–
14U
NS
2A..
...
...
...
...
...
.1.
4133
2B..
...
...
...
...
...
.
11 ⁄ 2–
24or
1.50
0–
24U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
15 ⁄ 8–
10or
1.62
5–
10U
NS
2A..
...
...
...
...
...
.1.
5041
2B..
...
...
...
...
...
.
15 ⁄ 8–
14or
1.62
5–
14U
NS
2A..
...
...
...
...
...
.1.
5383
2B..
.1.
564
...
...
...
...
NONMANDATORY APPENDIX E ASME B1.1-2003
标准下载网(www.bzxzw.com)
176
Tabl
eE-
2Li
mit
sas
List
edin
Tabl
eD
-1(F
orm
erly
3B)P
rior
toAS
ME
B1.
1-20
03Ed
itio
n(C
ont’
d)
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Func
tion
alD
iam
eter
UN
RM
inor
Maj
orM
ajor
Dia
met
er[N
ote
(1)]
Min
orD
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Max
.M
in.
Tole
ranc
eM
ax.
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
Tole
ranc
eM
in.
15 ⁄ 8–
24or
1.62
5–
24U
NS
2A..
...
...
...
.1.
5922
0.00
44..
.2B
...
...
...
...
...
...
13 ⁄ 4–
10or
1.75
0–
10U
NS
2A..
...
...
...
...
...
.1.
6291
2B..
...
...
...
...
...
.
13 ⁄ 4–
14or
1.75
0–
14U
NS
2A..
...
...
...
...
...
...
.2B
...
...
...
...
...
...
13 ⁄ 4–
18or
1.75
0–
18U
NS
2A..
...
...
...
...
...
.1.
6824
2B..
...
...
...
...
...
.
17 ⁄ 8–
10or
1.87
5–
10U
NS
2A0.
0019
1.87
311.
8602
1.80
811.
8016
...
1.75
342B
...
...
...
1.81
840.
0084
...
17 ⁄ 8–
14or
1.87
5–
14U
NS
2A..
...
...
...
...
...
.1.
7883
2B..
.1.
814
...
...
...
...
17 ⁄ 8–
18or
1.87
5–
18U
NS
2A..
...
...
...
...
...
.1.
8074
2B..
...
...
...
...
...
.
2–
10or
2.00
0–
10U
NS
2A..
...
...
...
...
...
.1.
8790
2B..
...
...
...
...
...
.
2–
14or
2.00
0–
14U
NS
2A..
...
...
...
...
...
.1.
9133
2B..
...
...
...
...
...
.
2–
18or
2.00
0–
18U
NS
2A..
...
...
...
...
...
.1.
9324
2B..
...
...
...
...
...
.
21 ⁄ 16
–16
or2.
0625
–16
UN
S2A
...
...
...
...
...
...
1.98
642B
...
...
...
...
...
...
3A..
...
...
...
...
...
.1.
9880
3B..
.2.
003
...
2.02
710.
0052
...
23 ⁄ 16
–16
or2.
1875
–16
UN
S2A
...
...
...
...
...
...
2.11
542B
...
...
...
2.15
390.
0070
...
3A..
...
...
...
...
...
.2.
1130
3B..
.2.
128
...
2.15
210.
0052
...
21 ⁄ 4–
10or
2.25
0–
10U
NS
2A..
...
...
...
.2.
1765
0.00
652.
1290
2B..
...
...
.2.
1935
0.00
85..
.
21 ⁄ 4–
14or
2.25
0–
14U
NS
2A..
...
...
...
.2.
1962
0.00
572.
1633
2B..
...
...
.2.
2110
0.00
74..
.
21 ⁄ 4–
18or
2.25
0–
18U
NS
2A0.
0015
2.24
852.
2398
2.21
242.
2073
0.00
512.
1824
2B..
...
...
.2.
2206
0.00
67..
.
25 ⁄ 16
–16
or2.
3125
–16
UN
S2A
0.00
172.
3108
2.30
142.
2702
2.26
47..
.2.
2363
2B..
...
...
.2.
2791
0.00
72..
.3A
...
...
...
...
...
...
2.23
803B
...
2.25
3..
.2.
2773
0.00
54..
.
27 ⁄ 16
–16
or2.
4375
–16
UN
S2A
...
...
...
...
...
...
2.36
132B
...
...
...
...
...
...
3A..
...
...
...
...
...
.2.
3630
3B..
.2.
378
...
...
...
...
21 ⁄ 2–
10or
2.50
0–
10U
NS
2A..
...
...
...
...
...
.2.
3790
2B..
...
...
...
...
...
.
21 ⁄ 2–
14or
2.50
0–
14U
NS
2A..
...
...
...
...
...
.2.
4133
2B..
...
...
...
...
...
.
ASME B1.1-2003 NONMANDATORY APPENDIX E
177
Tabl
eE-
2Li
mit
sas
List
edin
Tabl
eD
-1(F
orm
erly
3B)P
rior
toAS
ME
B1.
1-20
03Ed
itio
n(C
ont’
d)
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Func
tion
alD
iam
eter
UN
RM
inor
Maj
orM
ajor
Dia
met
er[N
ote
(1)]
Min
orD
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Max
.M
in.
Tole
ranc
eM
ax.
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
Tole
ranc
eM
in.
21 ⁄ 2–
18or
2.50
0–
18U
NS
2A..
...
...
...
...
...
.2.
4323
2B..
...
...
...
...
...
.
23 ⁄ 4–
10or
2.75
0–
10U
NS
2A..
...
...
...
.2.
6763
0.00
672.
6290
2B..
...
...
.2.
6837
0.00
87..
.
23 ⁄ 4–
14or
2.75
0–
14U
NS
2A0.
0017
2.74
832.
7380
2.70
192.
6961
0.00
582.
6633
2B..
...
...
.2.
7112
0.00
76..
.
23 ⁄ 4–
18or
2.75
0–
18U
NS
2A..
...
...
...
...
...
.2.
6823
2B..
...
...
.2.
7208
0.00
69..
.
3–
10or
3.00
0–
10U
NS
2A..
...
...
...
...
...
.2.
8790
2B..
...
...
...
...
...
.
3–
14or
3.00
0–
14U
NS
2A..
...
...
...
...
...
.2.
9132
2B..
...
...
...
...
...
.
3–
18or
3.00
0–
18U
NS
2A..
...
...
...
...
...
.2.
9323
2B..
...
...
...
...
...
.
31 ⁄ 4–
10or
3.25
0–
10U
NS
2A0.
0020
3.24
803.
2351
3.18
303.
1762
0.00
683.
1290
2B..
...
...
...
...
...
.
31 ⁄ 4–
14or
3.25
0–
14U
NS
2A..
...
...
...
.3.
1959
0.00
593.
1632
2B..
...
...
.3.
2113
0.00
77..
.
31 ⁄ 4–
18or
3.25
0–
18U
NS
2A..
...
...
...
.3.
2069
0.00
543.
1823
2B..
...
...
.3.
2209
0.00
70..
.
31 ⁄ 2–
10or
3.50
0–
10U
NS
2A..
...
...
...
...
...
.3.
3789
2B..
...
...
...
...
...
.
31 ⁄ 2–
14or
3.50
0–
14U
NS
2A..
...
...
...
...
...
.3.
4132
2B..
...
...
...
...
...
.
31 ⁄ 2–
18or
3.50
0–
18U
NS
2A..
...
...
...
...
...
.3.
4322
2B..
...
...
...
...
...
.
33 ⁄ 4–
10or
3.75
0–
10U
NS
2A..
...
...
...
.3.
6760
0.00
693.
6289
2B..
...
...
.3.
6940
0.00
90..
.
33 ⁄ 4–
14or
3.75
0–
14U
NS
2A..
...
...
...
...
...
.3.
6632
2B..
...
...
...
...
...
.
33 ⁄ 4–
18or
3.75
0–
18U
NS
2A..
...
...
...
.3.
7067
0.00
553.
6822
2B..
...
...
...
...
...
.
4–
10or
4.00
0–
10U
NS
2A..
...
...
...
...
...
.3.
8768
2B..
...
...
...
...
...
.
4–
14or
4.00
0–
14U
NS
2A..
...
...
...
...
...
.3.
9132
2B..
...
...
...
...
...
.
41 ⁄ 4–
10or
4.25
0–
10U
NS
2A..
...
...
...
.4.
1759
0.00
704.
1289
2B..
...
...
.4.
1941
0.00
91..
.
41 ⁄ 4–
14or
4.25
0–
14U
NS
2A0.
0018
4.24
824.
2379
4.20
184.
1956
...
4.16
322B
...
...
...
4.21
160.
0080
...
41 ⁄ 2–
10or
4.50
0–
10U
NS
2A..
...
...
...
.4.
4259
0.00
704.
3789
2B..
...
...
.4.
4441
0.00
91..
.
NONMANDATORY APPENDIX E ASME B1.1-2003
标准下载网(www.bzxzw.com)
178
Tabl
eE-
2Li
mit
sas
List
edin
Tabl
eD
-1(F
orm
erly
3B)P
rior
toAS
ME
B1.
1-20
03Ed
itio
n(C
ont’
d)
Exte
rnal
Inte
rnal
Pitc
hD
iam
eter
and
Pitc
hD
iam
eter
and
Func
tion
alD
iam
eter
Func
tion
alD
iam
eter
UN
RM
inor
Maj
orM
ajor
Dia
met
er[N
ote
(1)]
Min
orD
iam
eter
[Not
e(1
)]N
omin
alS
ize
and
Ser
ies
Dia
met
er,
Dia
met
er,
Thre
ads/
in.
Des
igna
tion
Clas
sA
llow
ance
Max
.M
in.
Max
.M
in.
Tole
ranc
eM
ax.
(Ref
.)Cl
ass
Min
.M
ax.
Min
.M
ax.
Tole
ranc
eM
in.
41 ⁄ 2–
14or
4.50
0–
14U
NS
2A0.
0018
4.49
824.
4879
4.45
184.
4456
0.00
624.
4132
2B..
...
...
.4.
4616
0.00
80..
.
43 ⁄ 4–
10or
4.75
0–
10U
NS
2A..
...
...
...
...
...
.4.
6288
2B..
...
...
.4.
6944
0.00
94..
.
43 ⁄ 4–
14or
4.75
0–
14U
NS
2A..
...
...
...
.4.
6953
0.00
644.
6631
2B..
...
...
.4.
7119
0.00
83..
.
5–
10or
5.00
0–
10U
NS
2A..
...
...
...
...
...
.4.
8788
2B..
...
...
...
...
...
.
5–
14or
5.00
0–
14U
NS
2A..
...
...
...
.4.
9453
...
4.91
312B
...
...
...
...
...
...
51 ⁄ 4–
10or
5.25
0–
10U
NS
2A..
...
...
...
.5.
1756
0.00
725.
1288
2B..
...
...
...
...
...
.
51 ⁄ 4–
14or
5.25
0–
14U
NS
2A..
...
...
...
...
...
.5.
1631
2B..
...
...
...
...
...
.
51 ⁄ 2–
10or
5.50
0–
10U
NS
2A..
...
...
...
.5.
4256
0.00
725.
3788
2B..
...
...
.5.
4444
0.00
94..
.
51 ⁄ 2–
14or
5.50
0–
14U
NS
2A..
...
...
...
...
...
.5.
4131
2B..
...
...
.5.
4619
0.00
83..
.
53 ⁄ 4–
10or
5.75
0–
10U
NS
2A..
...
...
...
.5.
6754
0.00
745.
6288
2B..
...
...
.5.
6946
0.00
96..
.
53 ⁄ 4–
14or
5.75
0–
14U
NS
2A0.
0020
5.74
805.
7377
5.70
165.
6951
...
...
2B..
...
...
.5.
7121
0.00
85..
.
6–
10or
6.00
0–
10U
NS
2A..
...
...
...
...
...
.5.
8788
2B..
...
...
...
...
...
.
6–
14or
6.00
0–
14U
NS
2A..
...
...
...
...
...
.5.
9130
2B..
...
...
...
...
...
.
GEN
ERA
LN
OTE
S:
(a)
The
limit
slis
ted
inth
isTa
ble
are
nolo
nger
cons
ider
edst
anda
rdan
dar
efo
rin
form
atio
non
ly.
They
have
been
repl
aced
beca
use
ofca
lcul
atio
ner
rors
and
ach
ange
inro
undi
ngm
etho
ds.
(b)
Prod
uct
thre
ads,
gage
s,or
tool
ing
that
conf
orm
orw
ere
gene
rate
dus
ing
limit
slis
ted
inth
isTa
ble
shou
ldbe
cons
ider
edac
cept
able
.W
hen
repl
acin
g,th
ene
wlim
its
shou
ldbe
used
.(c
)It
isre
com
men
ded
that
all
user
spr
epar
efo
rth
eev
entu
alad
opti
onof
only
the
valu
esin
Tabl
eD
-1.
NO
TE:
(1)
See
para
.5.
2.1
for
Func
tion
alD
iam
eter
.
ASME B1.1-2003 NONMANDATORY APPENDIX E
OTHER STANDARDS FOR SCREW THREADS
Unified Inch Screw Threads (UN and UNR Thread Form). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.1-2003Gages and Gaging for Unified Inch Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.2-1983 (R2001)Screw Thread Gaging Systems for Dimensional Acceptability —
Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.3M-1992 (R2001)Acme Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.5-1997Nomenclature, Definitions, and Letter Symbols for Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.7M-1984 (R2001)Stub Acme Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.8-1988 (R2001)Buttress Inch Screw Threads 7°/45° Form With 0.6 Pitch Basic Height of Thread Engagement . . . . . . . . . . . . . . . . . . . . . . . B1.9-1973 (R2001)Unified Miniature Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.10M-2004Microscope Objective Thread . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.11-1958 (R2001)Class 5 Interference-Fit Thread . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B1.12-1987t(R1998)Metric Screw Threads — M Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.13M-2001Unified Inch Screw Threads (UNJ Thread Form) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.15-1995Gages and Gaging for Metric M Screw Threads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.16M-1984 (R2001)Pipe Threads, General Purpose (Inch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.20.1-1983 (R2001)Dryseal Pipe Threads (Inch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.20.3-1976 (R1998)Gaging for Dryseal Pipe Threads (Inch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.20.5-1991 (R1998)Hose Coupling Screw Threads (Inch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.20.7-1991 (R1998)Metric Screw Threads: MJ Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.21M-1997Gages and Gaging for MJ Series Metric Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.22M-1985 (R2001)Screw Threads — Standard Practice for Calculating and Rounding Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.30-2002
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