Rolling bearings - bearingsandindustrialsupply.com Ybearings with a tapered bore on an adapter sleeve, ... 8.4 Spherical roller bearings on an adapter sleeve ... 16.3 Adapter sleeves

Rolling bearings

SKF, Duoflex, CARB, ICOS, INSOCOAT, KMT, KMTA, Monoflex, Multiflex, NoWear, SensorMount, SKF Explorer, SYSTEM 24 and Wave are registered trademarks of the SKF Group.

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SKF Group 2013The contents of this publication are the copyright of the publisher and may not be reproduced (even extracts) unless prior written permission is granted. Every care has been taken to ensure the accuracy of the information contained in this publication but no liability can be accepted for any loss or damage whether direct, indirect or consequential arising out of the use of the information contained herein.

PUB BU/P1 10000/2 EN August 2013

This publication supersedes publications 6000 EN, 6000/I EN, PUB PSD/P1 06003 EN, PUB BU/P1 10000 EN and PUB BU/P1 10000/1 EN.

Certain image(s) used under license from Shutterstock.com

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Rolling bearings

Rolling bearings

Unit conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9This is SKF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14SKF the knowledge engineering company . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Principles of bearing selection and application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

A Bearing basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Selecting rolling bearings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Bearing types and designs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Boundary dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Basic bearing designation system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Basic selection criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

B Selecting bearing size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61A systems approach to bearing selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62Bearing life and load ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63Selecting bearing size using the life equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64Dynamic bearing loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84Selecting bearing size using static load carrying capacity . . . . . . . . . . . . . . . . . . . . . . . . 87Calculation examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90SKF calculation tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92SKF Engineering Consultancy Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94SKF life testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

C Friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97Estimating the frictional moment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98The SKF model for calculating the frictional moment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99Starting torque . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114Power loss and bearing temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

D Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117Basics of bearing speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118Reference speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118Limiting speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126Special cases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127Vibration generation at high speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

2

E Bearing specifics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132Bearing internal clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149Materials for rolling bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

F Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159Bearing systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160Radial location of bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165Axial location of bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204Design of associated components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210Selecting internal clearance or preload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226

G Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239Basics of lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240Grease lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242Lubricating greases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244SKF greases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249Relubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252Relubrication procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258Oil lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262

H Mounting, dismounting and bearing care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275Dismounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285Bearing storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291Inspection and cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291

Product data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292

1 Deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295Product tables1.1 Single row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3221.2 Capped single row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3461.3 ICOS oil sealed bearing units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3741.4 Single row deep groove ball bearings with a snap ring groove . . . . . . . . . . . . . . . 3761.5 Single row deep groove ball bearings with a snap ring and shields . . . . . . . . . . . 3821.6 Stainless steel deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3861.7 Capped stainless steel deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . 3941.8 Single row deep groove ball bearings with filling slots . . . . . . . . . . . . . . . . . . . . . 4101.9 Single row deep groove ball bearings with filling slots and a snap ring . . . . . . . . 4141.10 Double row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416

2 Y-bearings (insert bearings) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421Product tables2.1 Ybearings with grub screws, metric shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4582.2 Ybearings with grub screws, inch shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4602.3 Ybearings with an eccentric locking collar, metric shafts . . . . . . . . . . . . . . . . . . 4642.4 Ybearings with an eccentric locking collar, inch shafts . . . . . . . . . . . . . . . . . . . . 4662.5 SKF ConCentra Ybearings, metric shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4682.6 SKF ConCentra Ybearings, inch shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469

3

2.7 Ybearings with a tapered bore on an adapter sleeve, metric shafts . . . . . . . . . . 4702.8 Ybearings with a tapered bore on an adapter sleeve, inch shafts . . . . . . . . . . . . 4712.9 Ybearings with a standard inner ring, metric shafts . . . . . . . . . . . . . . . . . . . . . . 472

3 Angular contact ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 475Product tables3.1 Single row angular contact ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5063.2 Double row angular contact ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5223.3 Capped double row angular contact ball bearings . . . . . . . . . . . . . . . . . . . . . . . . 5263.4 Fourpoint contact ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 530

4 Self aligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 537Product tables4.1 Selfaligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5524.2 Sealed selfaligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5604.3 Selfaligning ball bearings with an extended inner ring . . . . . . . . . . . . . . . . . . . . 5624.4 Selfaligning ball bearings on an adapter sleeve . . . . . . . . . . . . . . . . . . . . . . . . . . 564

5 Cylindrical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 567Product tables5.1 Single row cylindrical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6045.2 Highcapacity cylindrical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6405.3 Single row full complement cylindrical roller bearings . . . . . . . . . . . . . . . . . . . . . 6445.4 Double row full complement cylindrical roller bearings . . . . . . . . . . . . . . . . . . . . 6565.5 Sealed double row full complement cylindrical roller bearings . . . . . . . . . . . . . . 668

6 Needle roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 673Product tables6.1 Needle roller and cage assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7226.2 Drawn cup needle roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7306.3 Needle roller bearings with machined rings with flanges,

without an inner ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7446.4 Needle roller bearings with machined rings with flanges,

with an inner ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7586.5 Needle roller bearings with machined rings without flanges,

without an inner ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7706.6 Needle roller bearings with machined rings without flanges,

with an inner ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7746.7 Alignment needle roller bearings, without an inner ring . . . . . . . . . . . . . . . . . . . 7766.8 Alignment needle roller bearings with an inner ring . . . . . . . . . . . . . . . . . . . . . . . 7786.9 Needle roller / angular contact ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7806.10 Needle roller / thrust ball bearings, full complement thrust bearing . . . . . . . . . . 7846.11 Needle roller / thrust ball bearings, thrust bearing with a cage . . . . . . . . . . . . . . 7866.12 Needle roller / cylindrical roller thrust bearings . . . . . . . . . . . . . . . . . . . . . . . . . . 7886.13 Needle roller bearing inner rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7906.14 Needle rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 794

7 Tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 797Product tables7.1 Metric single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8247.2 Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8427.3 Single row tapered roller bearings with a flanged outer ring . . . . . . . . . . . . . . . . 8647.4 Matched bearings arranged facetoface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 866

4

7.5 Matched bearings arranged backtoback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8727.6 Matched bearings arranged in tandem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 876

8 Spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 879Product tables8.1 Spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9048.2 Sealed spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9288.3 Spherical roller bearings for vibratory applications . . . . . . . . . . . . . . . . . . . . . . . 9368.4 Spherical roller bearings on an adapter sleeve . . . . . . . . . . . . . . . . . . . . . . . . . . . 9408.5 Spherical roller bearings on a withdrawal sleeve . . . . . . . . . . . . . . . . . . . . . . . . . 9468.6 Sealed spherical roller bearings on an adapter sleeve . . . . . . . . . . . . . . . . . . . . . 954

9 CARB toroidal roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 957Product tables9.1 CARB toroidal roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9809.2 Sealed CARB toroidal roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9969.3 CARB toroidal roller bearings on an adapter sleeve . . . . . . . . . . . . . . . . . . . . . . . 10009.4 CARB toroidal roller bearings on a withdrawal sleeve . . . . . . . . . . . . . . . . . . . . . 1004

10 Thrust ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1009Product tables10.1 Single direction thrust ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101610.2 Single direction thrust ball bearings with a sphered housing washer . . . . . . . . . 102610.3 Double direction thrust ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103010.4 Double direction thrust ball bearings with sphered housing washers . . . . . . . . . 1034

11 Cylindrical roller thrust bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1037Product table11.1 Cylindrical roller thrust bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1048

12 Needle roller thrust bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1057Product tables12.1 Needle roller and cage thrust assemblies and appropriate washers . . . . . . . . . . 107012.2 Needle roller thrust bearings with a centring flange and appropriate washers . 1074

13 Spherical roller thrust bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1077Product table13.1 Spherical roller thrust bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1090

14 Track runner bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1099Product tables14.1 Single row cam rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112614.2 Double row cam rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112814.3 Support rollers without flange rings, without an inner ring . . . . . . . . . . . . . . . . . 113014.4 Support rollers without flange rings, with an inner ring. . . . . . . . . . . . . . . . . . . . 113214.5 Support rollers with flange rings, with an inner ring . . . . . . . . . . . . . . . . . . . . . . 113414.6 Cam followers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1140

15 Engineered products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114915A Sensor bearing units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1151

Product table15A.1 Motor encoder units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1166

5

15B Bearings for extreme temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1169Product tables

15B.1 Single row deep groove ball bearings for extreme temperatures . . . . . . . . . . . . 117815B.2 Ybearings for extreme temperatures, metric shafts . . . . . . . . . . . . . . . . . . . . . . 118215B.3 Ybearings for extreme temperatures, inch shafts . . . . . . . . . . . . . . . . . . . . . . . . 118315C Bearings with Solid Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118515D SKF DryLube bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119115E INSOCOAT bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1205

Product tables15E.1 INSOCOAT deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121215E.2 INSOCOAT cylindrical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121415F Hybrid bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1219

Product tables15F.1 Hybrid deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123015F.2 Sealed hybrid deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123215F.3 XL hybrid deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123615F.4 Hybrid cylindrical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123815G NoWear coated bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124115H Polymer ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1247

Product tables15H.1 Polymer single row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . 126215H.2 Polymer thrust ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1266

16 Bearing accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1269Product tables16.1 Adapter sleeves for metric shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129016.2 Adapter sleeves for inch shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129816.3 Adapter sleeves with inch dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130416.4 Withdrawal sleeves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131016.5 KM(L) and HM .. T lock nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131616.6 MB(L) lock washers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131816.7 HM(E) lock nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132016.8 MS locking clips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132416.9 N and AN inch lock nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132616.10 W inch lock washers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133016.11 PL inch locking plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133216.12 KMK lock nuts with an integral locking device . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133316.13 KMFE lock nuts with a locking screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133416.14 KMT precision lock nuts with locking pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133616.15 KMTA precision lock nuts with locking pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133816.16 KMD precision lock nuts with axial locking screws . . . . . . . . . . . . . . . . . . . . . . . . 1340

Indexes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1342

Text index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1343

Product index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1364

6

Unit conversions

Unit conversions

Quantity Unit Conversion

Length inch 1 mm 0.03937 in. 1 in. 25,40 mmfoot 1 m 3.281 ft. 1 ft. 0,3048 myard 1 m 1.094 yd. 1 yd. 0,9144 mmile 1 km 0.6214 mi. 1 mi. 1,609 km

Area square inch 1 mm2 0.00155 sqin 1 sqin 645,16 mm2square foot 1 m2 10.76 sqft 1 sqft 0,0929 m2

Volume cubic inch 1 cm3 0.061 cuin 1 cuin 16,387 cm3cubic foot 1 m3 35 cuft 1 cuft 0,02832 m3imperial gallon 1 l 0.22 gallon 1 gallon 4,5461 lUS gallon 1 l 0.2642 US gallon 1 US gallon 3,7854 l

Speed, velocity

foot per second 1 m/s 3.28 ft/s 1 ft/s 0,30480 m/smile per hour 1 km/h 0.6214 mph 1 mph 1,609 km/h

Mass ounce 1 g 0.03527 oz. 1 oz. 28,350 gpound 1 kg 2.205 lb. 1 lb. 0,45359 kgshort ton 1 tonne 1.1023 short ton 1 short ton 0,90719 tonnelong ton 1 tonne 0.9842 long ton 1 long ton 1,0161 tonne

Density pound per cubic inch 1 g/cm3 0.0361 lb/cuin 1 lb/cuin 27,680 g/cm3

Force poundforce 1 N 0.225 lbf. 1 lbf. 4,4482 N

Pressure, stress

pounds per square inch 1 MPa 145 psi 1 psi 6,8948 103 Pa1 N/mm2 145 psi1 bar 14.5 psi 1 psi 0,068948 bar

Moment poundforce inch 1 Nm 8.85 lbfin 1 lbfin 0,113 Nm

Power footpound per second 1 W 0.7376 ftlbf/s 1 ftlbf/s 1,3558 Whorsepower 1 kW 1.36 hp 1 hp 0,736 kW

Temperature degree Celsius tC = 0.555 (tF 32) Fahrenheit tF = 1,8 tC + 32

8

Foreword

This catalogue contains the standard assortment of SKF rolling bearings typically used in industrial applications. To provide the highest levels of quality and customer service, these products are available worldwide through SKF sales channels. For information about lead times and deliveries, contact your local SKF representative or SKF Authorized Distributor.

The data in this catalogue reflect SKFs stateoftheart technology and production capabilities as of 2012. The data contained within may differ from that shown in earlier catalogues because of redesign, technological developments, or revised calculation methods. SKF reserves the right to continually improve its products with respect to materials, design and manufacturing methods, some of which are driven by technological developments.

Getting startedThis catalogue contains detailed information about standard SKF rolling bearings, several special engineered products and bearing accessories. Engineered products include motor encoder units, which can measure the speed and direction of rotation, polymer bearings and rolling bearings designed to fulfil add itional requirements, such as:

extreme temperatures electrical insulation dry lubrication insufficient lubrication rapid speed changes high vibration levels oscillating movements

The first section, which contains general technical information, is designed to help the reader select the best, most effective products

for a particular application. In this section, bearing service life, speed capabilities, friction, general design considerations and lubrication are discussed in detail. Installation and maintenance information is also included. More practical information about mounting and maintenance is provided in the SKF bear-ing maintenance handbook (ISBN 9789197896641).

The latest developmentsThe main content updates compared to the previous catalogue include the addition of Ybearings and needle roller bearings as well as the following featured products:

SKF Energy Efficient bearingsTo meet the everincreasing demand to reduce energy use, SKF has developed the SKF Energy Efficient (E2) performance class of rolling bearings. SKF E2 bearings are characterized by a frictional moment in the bearing

SKF Energy Efficient bearings are identified by the designation prefix E2.

9

that is at least 30% lower when compared to a samesized SKF standard bearing.

High-capacity cylindrical roller bearingsSKF highcapacity cylindrical roller bearings combine the high load carrying capacity of full complement bearings and the high speed capability of bearings with a cage. They are designed for applications such as industrial gearboxes, gearboxes in wind turbines and mining equipment.

SKF DryLube bearingsSKF DryLube bearings are a new option for extreme temperature applications. They are filled with a dry lubricant, based on graphite and molybdenum disulfide. The dry lubricant can protect the rolling elements and raceways from damage caused by solid contaminants. SKF DryLube bearings provide effective lubrication for high temperature applications, low startup torque at any temperature and low frictional moment during operation.

Polymer ball bearingsPolymer ball bearings are an excellent solution from both a technical and economic perspective, in applications where resistance to moisture or chemicals is essential. Polymer ball bearings use bearing rings or washers made of various polymer materials and balls made of glass, stainless steel or polymers. They are lightweight, self lubricating, quiet running, and resistant to corrosion, chemicals and wear and fatigue.

SKF ConCentra Y-bearings (insert bearings)The SKF ConCentra locking technology provides a true concentric fit of the bearing on a shaft, to virtually eliminate fretting corrosion. These bearings are as easy to mount as bearings with grub screw locking.

SKF high-capacity cylindrical roller bearing

SKF DryLube bearing

Polymer ball bearing

SKF ConCentra Y-bearing

Foreword

10

Printed and cut tabs simplify navigation

Grease life estimation for capped bearings

Grease life calculation for capped deep groove ball bearingsCapped deep groove ball bearings and Ybearings (insert bearings) are typically greased for life. SKF did extensive research to enable a theoretical approach to estimate the grease life depending on bearing speed, operating temperature, load and other factors.

Extended assortment for value-added bearingsThe assortment of capped bearings, SKF Explorer bearings, electrically insulated bearings and hybrid bearings has been extended.

How to use this catalogueThis catalogue is divided into two main sections: a technical section and a product section. The technical section describes in detail how to select and apply rolling bearings and covers eight main topics marked with printed tabs from A to H. The product section is divided into chapters by product type. Each chapter contains specific information about the bearing type and its optional variants and product tables. Each product chapter is clearly marked by cut tabs with an easily identifiable icon.

Find information quicklyThe catalogue is designed so that specific information can be found quickly. At the front of the catalogue there is the full table of contents. At the back, there is a product index and a full text index.

A comprehensive text index helps to locate specific information quickly.

1 Deep groove ball bearingsGrease life for capped bearingsGrease life for capped bearings should be esti-

mated according to the procedure described in

this section. The grease life for capped bear-

ings is presented as L10, i.e. the time period at

the end of which 90% of the bearings are still

reliably lubricated. The method to estimate

relubrication intervals ( Relubrication inter-

vals, page 252) represents the L01 grease life

and should not be used.The grease life for capped bearings depends

on the operating temperature and the speed

factor. It can be obtained from the diagrams.

Diagram 1 is valid for standard deep groove

ball bearings. The grease performance factor

(GPF) is listed in table 4 ( page 305).

Diagram 2 is valid for SKF Energy Efficient

deep groove ball bearings.The grease life for each is valid under the

following operating conditions:

Diagram 1

Grease life for capped deep groove ball bearings

where P = 0,05 C

n = rotational speed [r/min]dm = bearing mean diameter [mm]

= 0,5 (d + D)

100 000

n dm = 100 000

n dm = 20 00010 000

1 000

100

200 000300 000

400 000500 000

600 000700 000

GPF = 1GPF = 2GPF = 4

405570

456075

506580

557085

607590

658095

7085

100

7590

105

8095

110

85100115

90105120

95110125

100115130

105120135

110125140

115130145

Grease life L10 [h]

Operating temperature [C]

for various grease performance factors (GPF)

horizontal shaft

inner ring rotation

light load (

P 0,05 C)operating temperature within the green

temperature zone of the grease

( table 4, page 305)stationary machine

low vibration levels

For stainless steel bearings filled with VT378

grease, use the scale corresponding to GPF = 1

and multiply the value obtained from the dia-

gram by 0,2.

306

Bearing types and designs

Track runner bearingsTrack runner bearings ( page 1099) are

bearings with a thick walled outer ring. These

ready-to-mount units are used in all types of

cam drives, tracks and conveyor systems.

Tapered roller thrust bearings1)single direction with or without (70) a cover screw down bearings

double direction (71)

Cam rollers single row (72)double row (73)

Support rollers without flange rings with or without contact seals without an inner ring with an inner ring (74)

with flange rings, based on needle roller

bearingswith or without contact seals

with a cage-guided roller set (75)

with a full complement roller set

74

75

70

71

72

73

1) Refer to product information available online at

skf.com/bearings or separate catalogue.

35

A

Deep groove ball bearings 1Y-bearings (insert bearings) 2Angular contact ball bearings 3Self-aligning ball bearings 4Cylindrical roller bearings 5Needle roller bearings 6Tapered roller bearings 7Spherical roller bearings 8CARB toroidal roller bearing 9

Thrust ball bearings 10Cylindrical roller thrust bearings 11Needle roller thrust bearings 12Spherical roller thrust bearings 13Track runner bearings 14Engineered products 15Bearing accessories 16

Text index

A

A angular contact ball bearings 479, 504

lock nuts and locking devices 1280, 1289

motor encoder units 1161track runner bearings 1103, 1107, 1125

ABMA standards 41abutment collars 206abutments dimensions 208209tolerances 169, 200202

AC 504 AC current protection with hybrid bearings 1220, 1226

protection with INSOCOAT bearings 1209

AC motors 1152accessories 12691341acetone 1251acids resistance of polymer ball bearings 1251

resistance of seal materials 156157

acrylonitrile-butadiene rubber (NBR) 155

hydrogenated acrylonitrile-butadiene rubber (HNBR) 156

ADA 580, 602 adapter sleeves 12701274, 12901309

axial load carrying capacity 894

bearing seat tolerances 200201

coatings 1270designation system 12881289

designs and variants 12701273

dimension standards 1274dismounting bearings 288289

for CARB toroidal roller bearings 975, 10001003, 1273

for inch shafts 12981303for metric shafts 12901297for oil injection 12701272for self-aligning ball bearings 546547, 564565, 1273

for spherical roller bearings 898899, 940945, 954955,

1273 for Y-bearings 422423, 427, 470471

mounting bearings 278on a stepped shaft 207, 1270product tables 12901309spacer rings 207, 1270tapers 1274threads 1274tolerances 1274with inch dimensions 13041309

adapters 1108, 1110ADB 580, 602 additives in grease 244, 248, 254in oil 265266adjusted bearing systems 163

adjusted reference speed 120adjustment factors 121124

calculation examples 125compared to limiting speed 126

adjusting bearings angular contact ball bearings 498

for internal clearance 277for preload 218220procedures 221225tapered roller bearings 816817

AFBMA standards 41agricultural applications

and Y-bearings 435, 446447

specification life 83AH 457 alcohols 1251alignment needle roller bearings 683, 776779

cages 693695, 714designs and variants 683dimension standards 703fits and tolerance classes 716

internal clearance 702703loads 711misalignment 52, 702703

mounting 718product tables 776779temperature limits 714tolerances 702703

aliphatic hydrocarbons resistance of fluoro rubber 156

resistance of polymer ball bearings 1251

alkalis resistance of polymer ball bearings 1251

resistance of polyurethane 157

Allen wrenches hexagonal keys

aluminium oxide (Al2O3) in polymer ball bearings 1251, 1260

on INSOCOAT bearings (coating) 1206

ambient temperature 240amines 156ammonia 152, 154

AMP Superseal connectors 1154, 1155, 1161

angle rings 571, 604639angle series 40angular contact ball bearings 475535

adjustment during mounting 221225, 277

assortment 476, 500502axial load carrying capacity 476, 498

bearing arrangements 160163

cages 480481, 497combined with a needle roller bearing 684685, 780783

contact angle 476, 486487, 498, 504

design provisions 498499designation system 504505designs and variants 28, 476484

dimension standards 486487

dimensional stability 497double row bearings 478479, 522529

for universal matching 477, 500, 506521

four-point contact ball bearings 480, 530535

Note: Designation prefixes and suffixes are shown in bold.

1343

Index

11

Foreword

Designation chart to decode designation suffixes Designation suffixes listed in the text index reduce search time.

The product index makes finding information based on a bearings designation easy.

Numbered product tables make it easier to access product data.

Find product details quicklyA quick way to access detailed product data is via a product table number. Product table numbers are listed in the table of contents at the front of the catalogue, in the table of contents at the start of each product chapter and in the product index at the back of the catalogue.

Identify productsProduct designations for SKF rolling bearings typically contain information about the bearing and additional features. To specify an SKF bearing or to find more information about it, there are three options:

Product indexThe product index at the end of the catalogue lists series designations, relates them to the bearing type and guides the reader to the relevant product chapter and product table. Designation charts

Product designations in each product chapter are located on the pages preceding the product tables. These charts identify commonly used designation prefixes and suffixes. Text index

The text index at the end of the catalogue contains designation suffixes in alphabetical order. They are printed bold for quick browsing. 150 225 56 510 750 73,5 670

7,95 * 23030-2CS5/VT143* 23030-2CS5K/VT143

150 165 211 8,3 4,5 2,1161

165214

20,2

3,45

3,2

225 75 655 1 040 100 53010,5 * 24030-2CS5/VT143

162 206 63

2,1161

162214

20,28 2,4

3,62,5

250 80 850 1 200 114 56016

* 23130-2CS5/VT143* 23130-2CS5K/VT143

168 226 11,1 62,1

162168

2382

0,28 2,43,6

2,5

250 100 1 020 1 530 146 40020

* 24130-2CS5/VT143

163 222 8,3 4,5 2,1162

163238

20,37 1,8

2,71,8

270 73 850 1 080 102 63018

* 22230-2CS5/VT143* 22230-2CS5K/VT143

174 248 13,9 7,5 3164

174256

2,50,24 2,8

4,22,8

270 96 1 080 1 460 137 43024,5 * 23230-2CS5/VT143

* 23230-2CS5K/VT143

171 243 11,1 63

164171

2562,5

0,33 23

2

320 108 1 460 1 760 146 40043,5 * 22330-2CS5/VT143

* 22330-2CS5K/VT143

181 281 16,7 94

167181

3033

0,33 23

2

160 240 60 585 880 83670

9,7* 23032-2CS5/VT143

* 23032-2CS5K/VT143

160 177 225 11,1 62,1

171177

2292

0,23,4

53,2

240 80 750 1 200 114 45013

* 24032-2CS5/VT143

173 218 8,3 4,5 2,1171

173229

20,28 2,4

3,62,5

270 86 980 1 370 129 53020,5 * 23132-2CS5/VT143

* 23132-2CS5K/VT143

180 244 13,9 7,5 2,1172

180258

20,28 2,4

3,62,5

270 109 1 200 1 760 163 38025

* 24132-2CS5/VT143

176 239 8,3 4,5 2,1172

176258

20,37 1,8

2,71,8

290 80 1 000 1 290 118 60022,5 * 22232-2CS5/VT143

* 22232-2CS5K/VT143

185 264 13,9 7,5 3174

185276

2,50,25 2,7

42,5

340 114 1 600 1 960 160 38052

* 22332-2CS5/VT143* 22332-2CS5K/VT143

193 296 16,7 94

177193

3233

0,33 23

2

170 260 67 710 1 080 100 63013

* 23034-2CS5/VT143* 23034-2CS5K/VT143

170 188 243 11,1 62,1

181188

2492

0,22 34,6

2,8

260 90 930 1 460 137 40017,5 * 24034-2CS5/VT143

184 235 8,3 4,5 2,1181

184249

20,3

2,33,4

2,2

280 88 1 040 1 500 137 48022

* 23134-2CS5/VT143* 23134-2CS5K/VT143

190 256 13,9 7,5 2,1182

190268

20,28 2,4

3,62,5

280 109 1 220 1 860 170 36027,5 * 24134-2CS5/VT143

185 248 8,3 4,5 2,1182

185268

20,37 1,8

2,71,8

310 86 1 120 1 460 134 50028,5 * 22234-2CS5/VT143

* 22234-2CS5K/VT143

198 282 16,7 94

187198

2933

0,25 2,74

2,5

180 280 74 850 1 270 114 56017

* 23036-2CS5/VT143* 23036-2CS5K/VT143

180 199 262 13,9 7,5 2,1191

199269

20,22 3

4,62,8

280 100 1 080 1 730 156 38023

* 24036-2CS5/VT143

194 251 8,3 4,5 2,1191

194269

20,31 2,2

3,32,2

300 96 1 200 1 800 160 43028

* 23136-2CS5/VT143* 23136-2CS5K/VT143

202 272 13,9 7,5 3194

202286

2,50,28 2,4

3,62,5

300 118 1 400 2 160 196 36034,5 * 24136-2CS5/VT143

198 266 11,1 63

194198

2862,5

0,37 1,82,7

1,8

320 86 1 180 1 560 140 53029

* 22236-2CS5/VT143* 22236-2CS5K/VT143

208 289 16,7 94

197208

3033

0,24 2,84,2

2,8

190 320 104 1 400 2 080 183 40035

* 23138-2CS5/VT143* 23138-2CS5K/VT143

190 215 288 13,9 7,5 3204

215306

2,50,3

2,33,4

2,2

320 128 1 600 2 500 212 34043

* 24138-2CS5/VT143

210 282 11,1 63

204210

3062,5

0,41,7

2,51,6

340 92 1 290 1 700 150 48035

* 22238-2CS5/VT143* 22238-2CS5K/VT143

220 306 16,7 94

207220

3233

0,24 2,84,2

2,8

200 310 82 1 000 1 530 137 48022

* 23040-2CS5/VT143* 23040-2CS5K/VT143

200 223 286 13,9 7,5 2,1211

223299

20,22 3

4,62,8

340 112 1 600 2 360 204 38043

* 23140-2CS5/VT143* 23140-2CS5K/VT143

227 306 16,7 93

214227

3262,5

0,32,3

3,42,2

340 140 1 800 2 800 232 32053,5 * 24140-2CS5/VT143

221 294 11,1 63

214221

3262,5

0,41,7

2,51,6

360 98 1 460 1 930 166 43042

* 22240-2CS5/VT143* 22240-2CS5K/VT143

232 324 16,7 94

217232

3433

0,24 2,84,2

2,8

360 128 1 860 2 700 228 34058

* 23240-2CS5/VT143* 23240-2CS5K/VT143

230 320 16,7 94

217230

3433

0,35 1,92,9

1,8

8.2

Principal dimensions Basic load ratings Fatigue load limit

Limiting speed Mass Designations

Dimensions

Abutment and fillet dimensionsCalculation factors

Bearing with

dynamic static

cylindrical boretapered bore

dD

B CC0 Pu

dd2 D1 b

Kr1,2 da

daDa ra

eY1 Y2 Y0

~~

min.min. max. max. max.

mm kN

kN

r/minkg

mm

mm

daDa

ra

ra

933

Text index

J

J angular contact ball bearings 480, 504

cylindrical roller bearings 582, 602

spherical roller bearings 902tapered roller bearings 822

JA cylindrical roller bearings 602

spherical roller bearings 902

JB 582, 602

K

K CARB toroidal roller bearings 960, 978

cylindrical roller bearings 573, 602

cylindrical roller thrust bearings 1039, 1042, 1047

polymer ball bearings 1260spherical roller bearings 882, 902

Y-bearings 457K30 CARB toroidal roller bearings 960, 978

spherical roller bearings 882, 902

ketones 156key slots 1278, 12801281, 1289

keys hexagonal keyskeyways 1278, 12801281kilns

and bearings for extreme temperatures 1176

and SKF DryLube bearings 1193

kinematic replenishment/starvation 100, 102

kinematic viscosity viscosityL

L cylindrical roller bearings 602

lock nuts and locking devices 1289

polymer ball bearings 1260sleeves 1273, 1289

L4B 575, 603 L5B 603 L5DA 1242, 1244, 1245 L7B 603 L7DA 1242, 1244, 1245

labyrinth seals 228, 232large bearings 275, 285

effect on relubrication interval 254

LHT23 304305, 321 life

calculation examples 9092definition 63equations 6483testing 95unit conversion table 70

with variable operating conditions 81

life adjustment factor 65life modification factor 6470, 73

lifting tackle 274, 903limiting speed 126compared to reference speed 118

linear bearings 45load ratings 6364load ratio for angular contact ball bearings 498

for four-point contact ball bearings 499

loads conditions 165166considerations when selecting bearings 4851

effect on relubrication interval 254

ranges for grease lubricated bearings 243

locating bearings axial displacement 55axial location 204in bearing systems 160161

locating notches locating slots

locating slots in angular contact ball bearings 484

in cylindrical roller bearings 573

in deep groove ball bearings 320

locating/non-locating bearing systems 160162

location axial 204209radial 165204lock nut tightening angle 281values for CARB toroidal roller bearings 977

values for self-aligning ball bearings 549

values for spherical roller bearings 901

values for Y-bearings 453lock nuts designation system 12881289

designs and variants 12781282

dimension standards 12841285

for CARB toroidal roller bearings 1273

for sealed bearings 1273installation and removal 12861287

loosening torque 12841285

mating shaft threads 12841285

precision lock nuts 12811282, 12861287, 13361340

product tables 13161340tolerances 12841285with a locking screw 1280, 13341335

with an integral locking device 1280, 1333

with inch dimensions 1278, 1284, 13261328

lock washers design 12781279installation and removal 1286

product tables 13181319, 13301331

locking clips design 12781279installation and removal 1286

product table 13241325locking plates design 12781279installation and removal 1286

product table 1332logarithmic profile in cylindrical roller bearings 568569

in tapered roller bearings 798, 800

loose fits 170low-friction bearings SKF Energy Efficient (E2) bearings

low-friction seals 300, 302LS 602 LT 304305, 321

LT10 304305, 321 lubricant films effect of inlet shearing 101effect of kinematic starvation 102

effect on frictional moment 99

formation 241, 265lubricants dry lubricants 1192, 1195effect on polyamide 66 cages 153154

function 240greases 244251oils 265266Solid Oil 11861187lubricated for life bearings for extreme temperatures 1176

capped bearings 58lubrication 239269effect on frictional moment 99102, 103

grease 242261oil 262269lubrication holes 883, 886, 887

Note: Designation prefixes and suffixes are shown in bold.

1352

1 Deep groove ball bearings

Designation systemPrefixes

E2.SKF Energy Efficient bearing

ICOS-Oil sealed bearing unit

D/WStainless steel, inch dimensions

W

Stainless steel, metric dimensionsBasic designationListed in diagram 2 ( page 43)Suffixes

Group 1: Internal designE

Reinforced ball setGroup 2: External design (seals, snap ring groove etc.)

N

Snap ring groove in the outer ring

NR

Snap ring groove in the outer ring, with appropriate snap ring

N1

One locating slot (notch) in one outer ring side face

R

Flanged outer ring

-RS1, -2RS1Contact seal, NBR, on one or both sides

-RS2, -2RS2Contact seal, FKM, on one or both sides

-RSH, -2RSHContact seal, NBR, on one or both sides

-RSL, -2RSLLow-friction seal, NBR, on one or both sides

-RZ, -2RZNon-contact seal, NBR, on one or both sides

-Z, -2ZShield on one or both sides

-ZNRShield on one side, snap ring groove in the outer ring, snap ring on

the opposite side of the shield

-2ZNRShield on both sides, snap ring groove in the outer ring, with snap ring

-2ZSShield on both sides, held in place by a retaining ring

X

Boundary dimensions not in accordance with ISO dimension series

Group 3: Cage design

Stamped steel cage, ball centred

M

Machined brass cage, ball centred; different designs or material grades are

identified by a number following the M, e.g. M2

MA(S)Machined brass cage, outer ring centred. The S indicates a lubrication groove in the guiding surface.

MB(S)Machined brass cage, inner ring centred. The S indicates a lubrication groove in the guiding surface.

TN9Glass fibre reinforced PA66 cage, ball centred

TNHGlass fibre reinforced PEEK cage, ball centred

VG1561Glass fibre reinforced PA46 cage, ball centred

Group 4.6: Other variantsGroup 4.5: LubricationGJN

HTLHT23LT

LT10Grease suffixes ( table 4, page 305)

MT33MT47VT378WT

Group 4.4: StabilizationS0Bearing rings heat stabilized for operating temperatures 150 C (300 F)

S1Bearing rings heat stabilized for operating temperatures 200 C (390 F)

Group 4.3: Bearing sets, matched bearings

DBTwo bearings matched for mounting back-to-back

DFTwo bearings matched for mounting face-to-face

DTTwo bearings matched for mounting in tandem

Group 4.2: Accuracy, clearance, quiet running

P5Dimensional and running accuracy to P5 tolerance class

P6Dimensional and running accuracy to P6 tolerance class

P52P5 + C2P62 P6 + C2P63 P6 + C3CN Normal radial internal clearance; only used together with an additional

letter that identifies a reduced or displaced clearance range

H Reduced clearance range corresponding to the upper half of the actual

clearance rangeL Reduced clearance range corresponding to the lower half of the actual

clearance rangeP Displaced clearance range comprising the upper half of the actual

clearance range plus the lower half of the next larger clearance range

The above letters are also used together with the clearance classes C2, C3, C4

and C5, e.g. C2HC1

Radial internal clearance smaller than C2

C2Radial internal clearance smaller than Normal

C3Radial internal clearance greater than Normal

C4Radial internal clearance greater than C3

C5Radial internal clearance greater than C4

VQ658 Quiet running propertiesGroup 4.1: Materials, heat treatment

Group 1 Group 2 Group 3 /

Group 4

4.1 4.2 4.3 4.4 4.5 4.6

rssfssc

320

1) Starting page of the product table.

028.. . . . . . . . . . . . . . . . Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 842

03.. . . . . . . . . . . . . . . . . Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 842



10.. . . . . . . . . . . . . . . . . Self-aligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1 552


112.. . . . . . . . . . . . . . . . Self-aligning ball bearings with an extended inner ring . . . . . . . . . . . . . . . . . . . . . . . . 4.3 562




130.. . . . . . . . . . . . . . . . Self-aligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1 552




160.. . . . . . . . . . . . . . . . Single row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 322

160../HR . . . . . . . . . . . Polymer single row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15H.1 1262

161.. . . . . . . . . . . . . . . . Single row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 322

161../H . . . . . . . . . . . . . Polymer single row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15H.1 1262

17262.. . . . . . . . . . . . . . Y-bearings with a standard inner ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 472

17263.. . . . . . . . . . . . . . Y-bearings with a standard inner ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 472



2.. . . . . . . . . . . . . . . . . . Single row deep groove ball bearings with filling slots . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 410

2.. NR . . . . . . . . . . . . . . Single row deep groove ball bearings with filling slots and a snap ring . . . . . . . . . . . . 1.9 414

2..-2Z . . . . . . . . . . . . . . Shielded single row deep groove ball bearings with filling slots . . . . . . . . . . . . . . . . . . 1.8 410

2..-2ZNR . . . . . . . . . . . Shielded single row deep groove ball bearings with filling slots and a snap ring . . . . . 1.9 414

2..-Z . . . . . . . . . . . . . . . Shielded single row deep groove ball bearings with filling slots . . . . . . . . . . . . . . . . . . 1.8 410

2..-ZNR . . . . . . . . . . . . . Shielded single row deep groove ball bearings with filling slots and a snap ring . . . . . 1.9 414

213.. . . . . . . . . . . . . . . . Spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.1 904


22..-2RS1 . . . . . . . . . . Sealed self-aligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 560


222..-2CS5 . . . . . . . . . Sealed spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2 928


223../VA405 . . . . . . . . Spherical roller bearings for vibratory applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3 936

223../VA406 . . . . . . . . Spherical roller bearings for vibratory applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3 936



23..-2RS1 . . . . . . . . . . Sealed self-aligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 560


230..-2CS . . . . . . . . . . . Sealed spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2 928













Designation Product

Product table No. Page1)

Product index

136412

Units of measurementThis catalogue is for global use. Therefore, the predominant units of measurement are in accordance with ISO 800001. Exceptionally, imperial units are used when it is required by the product. Unit conversions can be made using the conversion table ( page 8).

For easier use, temperature values are provided in both, C and F. Temperature values are typically rounded. Therefore, the two values do not always exactly match when using the conversion formula.

More SKF rolling bearingsOther rolling bearings, not presented in this catalogue, include:

superprecision bearings ball and roller bearing units fixed section ball bearings large deep groove ball bearings with filling

slots large angular contact thrust ball bearings tapered roller thrust bearingsmultirow ball or roller bearings split roller bearings crossed tapered roller bearings slewing bearings linear ball bearings bearings for inline skates and skateboards backing bearings for cluster mills indexing roller units for continuous furnaces

of sintering plants application specific bearings for railway

rolling stock application specific bearings for cars and

trucks triple ring bearings for the pulp and paper

industry bearings for printing press rollers bearings for critical aerospace applications

For information about these products, contact SKF or visit skf.com.

13

This is SKF

From one simple but inspired solution to a mis-alignment problem in a textile mill in Sweden, and fifteen employees in 1907, SKF has grown to become a global industrial knowledge leader. Over the years we have built on our expertise in bearings, extending it to seals, mechatronics, services and lubrication systems. Our know-ledge network includes 46 000 employees, 15 000 distributor partners, offices in more than 130 countries, and a growing number of SKF Solution Factory sites around the world.

Research and development We have hands-on experience in over forty industries, based on our employees knowledge of real life conditions. In addition our world-leading experts and university partners who pioneer advanced theoretical research and development in areas including tribology, condi-tion monitoring, asset management and bearing life theory. Our ongoing commitment to research and devel opment helps us keep our customers at the forefront of their industries.

SKF Solution Factory makes SKF knowledge and manu facturing expertise available locally, to provide unique solutions and services to our customers.

14

Meeting the toughest challenges Our network of knowledge and experience along with our understanding of how our core technologies can be combined helps us create innovative solutions that meet the toughest of challenges. We work closely with our customers throughout the asset life cycle, helping them to profitably and re spon sibly grow their businesses.

Working for a sustainable future Since 2005, SKF has worked to reduce the negative environmental impact from our own operations and those of our suppliers. Our con-tinuing technology development intro duced the SKF BeyondZero portfolio of products and services which improve efficiency and reduce energy losses, as well as enable new technol-ogies harnessing wind, solar and ocean power. This combined approach helps reduce the environmental impact both in our own oper-ations and in our customers.

Working with SKF IT and logistics systems and application experts, SKF Authorized Distributors deliver a valuable mix of product and application knowledge to customers worldwide.

15

Our knowledge your successSKF Life Cycle Management is how we combine our technology plat-forms and advanced ser vices, and apply them at each stage of the asset life cycle, to help our cus-tomers to be more success ful, sustainable and profitable.

Working closely with you Our objective is to help our customers improve productivity, minimize main ten ance, achieve higher energy and resource efficiency, and opti-mize designs for long service life and reliability.

Innovative solutions Whether the application is linear or rotary or a combination of the two, SKF engineers can work with you at each stage of the asset life cycle to improve machine performance by looking at the

entire application. This approach doesnt just focus on individual components like bearings or seals. It looks at the whole application to see how each com po nent interacts with the next.

Design optimization and verificationSKF can work with you to optimize current or new designs with proprietary 3-D modeling software that can also be used as a virtual test rig to confirm the integrity of the design.

SKF the knowledge engineering company

Spec

ific

ation

Design and developManufacture and test

Install a

nd co

mm

issi

on

Operate and monitor

Maintain and repair

SKF Life Cycle Management

16

BearingsSKF is the world leader in the design, development and manufacture of high performance rolling bearings, plain bearings, bearing units and housings.

Machinery maintenanceCondition monitoring technologies and main tenance services from SKF can help minimize unplanned down-time, improve operational efficiency and reduce main-tenance costs.

Sealing solutionsSKF offers standard seals and custom engineered seal-ing solutions to increase uptime, improve machine reli-ability, reduce friction and power losses, and extend lubricant life.

MechatronicsSKF fly-by-wire systems for aircraft and drive-by-wire systems for off-road, agricultural and forklift applica-tions replace heavy, grease or oil consuming mechanical and hydraulic systems.

Lubrication solutionsFrom specialized lubricants to state-of-the-art lubrication systems and lubrication management ser vices, lubrication solutions from SKF can help to reduce lubrication related downtime and lubricant consumption.

Actuation and motion controlWith a wide assortment of products from actu ators and ball screws to profile rail guides SKF can work with you to solve your most pressing linear system challenges.

17

Principles of bearing selection and application

Bearing basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Selecting bearing size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Bearing specifics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239

Mounting, dismounting and bearing care . . . . . . . . . . . . 271

19

A

B

C

E

F

G

H

D

Bearing basics

Selecting rolling bearings . . . . . . . . . . . . 22

Terminology . . . . . . . . . . . . . . . . . . . . . . . . 23Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Bearing systems . . . . . . . . . . . . . . . . . . . . . 24Radial bearings . . . . . . . . . . . . . . . . . . . . . 24Thrust bearings . . . . . . . . . . . . . . . . . . . . . 25

Bearing types and designs . . . . . . . . . . . 26Radial bearings . . . . . . . . . . . . . . . . . . . . . . 26Thrust bearings . . . . . . . . . . . . . . . . . . . . . 33Track runner bearings . . . . . . . . . . . . . . . . 35Cages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Stamped metal cages . . . . . . . . . . . . . . . 37Machined metal cages . . . . . . . . . . . . . . 38Polymer cages . . . . . . . . . . . . . . . . . . . . 38Cage guidance . . . . . . . . . . . . . . . . . . . . . 39Materials . . . . . . . . . . . . . . . . . . . . . . . . . 39

Boundary dimensions . . . . . . . . . . . . . . . 40ISO general plans . . . . . . . . . . . . . . . . . . . . 40General plans for inch bearings . . . . . . . . . 41

Basic bearing designation system . . . . . 42Basic designations . . . . . . . . . . . . . . . . . . . 42Prefixes and suffixes . . . . . . . . . . . . . . . . . 45Bearing designations not covered by the basic bearing designation system . . . . 45

Basic selection criteria . . . . . . . . . . . . . . 46Available space . . . . . . . . . . . . . . . . . . . . . . 47Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Magnitude of load . . . . . . . . . . . . . . . . . . 48Direction of load . . . . . . . . . . . . . . . . . . . 48

Misalignment . . . . . . . . . . . . . . . . . . . . . . . 52Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . 53Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53Friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54Quiet running . . . . . . . . . . . . . . . . . . . . . . . 54Stiffness . . . . . . . . . . . . . . . . . . . . . . . . . . . 54Axial displacement . . . . . . . . . . . . . . . . . . . 55Mounting and dismounting . . . . . . . . . . . . 56

Cylindrical bore . . . . . . . . . . . . . . . . . . . . 56Tapered bore . . . . . . . . . . . . . . . . . . . . . . 56

Sealing solutions . . . . . . . . . . . . . . . . . . . . 58

21

A

Bearing basics

Selecting rolling bearingsA bearing system consists of more than just bearings. Associated components like the shaft and housings are integral parts of the overall system. The lubricant and sealing elem ents also play a critical role. To maximize bearing performance, the correct amount of an appropriate lubricant must be present to reduce friction in the bearing and protect it from corrosion. Sealing elements are important, because they keep the lubricant in and contaminants out of the bearing. This is particularly important because cleanliness has a profound effect on bearing service life which is why SKF manufactures and sells a wide range of industrial seals and lubrication systems.

There are a number of factors that go into the bearing selection process. Understanding the dynamic behaviour of the application is probably one of the most important. Dynamic behaviour, in this case, means:

available space loads (magnitude and direction)misalignment precision and stiffness speeds operating temperature vibration levels contamination levels lubrication type and method

Once the dynamic behaviour has been established, a suitable bearing type and size can be selected. However, during the bearing selection process there are several other factors that need to be considered:

a suitable form and design of other components of the arrangement appropriate fits and bearing internal clear

ance or preload holding devices adequate seals the type and quantity of lubricant installation and removal methods

When designing an application, every decision affects the performance, reliability and economy of the bearing system.

As the leading bearing supplier, SKF manufactures a large number of bearing types, series, designs, variants and sizes. The most common of them are introduced under Bear-ing types and designs ( page 26). There are also bearings that are not included in this catalogue. Information about most of these bearings is provided in special catalogues or online at skf.com/bearings.

In this section and in sections B through H, the designer of a bearing system can find the necessary basic information presented in the order in which it is generally required. Obviously, it is impossible to include all the information needed to cover every conceivable application. For this reason, in many places, reference is made to the SKF application engin eer ing ser vice. This technical service can perform complex calculations, diagnose and solve bearing performance issues, and help with the bearing selection process. SKF also recommends this service to anyone working to improve the performance of their application.

The information contained in this section and in sections B through H is general and applies to most rolling bearings. Information specific to one bearing type is provided in the relevant product chapter. Additional catalogues and brochures covering specific application areas are available on request. Detailed information about almost all SKF rolling bearings, bearing units, housings, plain bearings and seals is available online at skf.com/bearings.

It should be noted that the values listed in the product tables for load and speed ratings as well as for the fatigue load limit are heavily rounded.

22
http://skf.com/bearingshttp://skf.com/bearings

Terminology

TerminologySome frequently used bearing terms are explained here. For a detailed collection of bearingspecific terms and definitions, refer to ISO 5593 Rolling bearings Vocabulary.

SymbolsSymbols used in this catalogue are mainly in accordance with ISO standards. Most common symbols for bearing boundary dimensions are shown in fig. 1. Other symbols are listed below. All symbols can be used with a subscript to identify specifications.

A = speed factor = n dm [mm/min]

C = bearing load rating [kN]dm = bearing mean diameter [mm]

= 0,5 (d + D)F = actual bearing load [kN]L = life, typically in million revolutions or

operating hoursn = rotational speed [r/min]P = equivalent bearing load [kN]Pu = fatigue load limit [kN]hc = factor for contamination level k = viscosity ratio: actual versus requiredn = oil viscosity [mm2/s]

Fig. 1

D

B

d

r

a

r

D

d

H

23

A

Bearing basics

1 3

4

5

8

9

10

13

12 14

7

11

6

2

Fig. 2

10 1118

12

13

14

15

16

17

1819

9

7

5

6

81

2

3

4

Fig. 3

Bearing systems ( fig . 2)1 Cylindrical roller bearing2 Fourpoint contact ball

bearing3 Housing4 Shaft5 Shaft abutment shoulder6 Shaft diameter7 Shaft seat8 End plate9 Radial shaft seal 10 Distance ring11 Housing bore diameter12 Housing seat13 Housing cover14 Snap ring

Radial bearings ( figs . 3 and 4)1 Inner ring2 Outer ring3 Rolling element: ball, cylin

dric al roller, needle roller, taper ed roller, spherical roller, toroidal roller

4 Cage5 Capping device

Seal made of elastomer Shield made of sheet steel

6 Outer ring outside surface7 Inner ring bore8 Inner ring shoulder surface9 Outer ring shoulder surface10 Snap ring groove11 Snap ring12 Outer ring side face13 Recess for capping device

24

Terminology

14

21

15

17

23

206

2

12

3

4

22

1

7

a

a

Fig. 4

27

26

25

24

24

28

24

25

26

Fig. 5

14 Outer ring raceway15 Inner ring raceway16 Recess for capping device17 Inner ring side face18 Chamfer 19 Bearing pitch circle diameter20 Total bearing width21 Guide flange22 Retaining flange23 Contact angle

Thrust bearings ( fig . 5)24 Shaft washer25 Rolling element and cage

assembly26 Housing washer27 Housing washer with a

sphered seat surface28 Seat washer

25

A

Bearing basics


Deep groove ball bearings ( page 295)single row

open basic design (1) with shields with seals (2)

single row, stainless steel open basic design (1)with shieldswith seals (2)

single row, with filling slots open basic design (3)with shieldswith a snap ring groove, with or without a snap ring

double row (4)

thin section bearings1)open basic design (5) with contact seals

Radial bearingsRadial bearings accommodate loads that are predominantly perpendicular to the shaft. The bearings are typically classified by the type of rolling element and shape of the raceways.

1) Contact the SKF application engineering service.

4

5

3

1 2

26


Y-bearings (insert bearings) ( page 421)with grub screws

inner ring extended on one side (6)inner ring extended on both sides (7)

with an eccentric locking collarinner ring extended on one side (8)inner ring extended on both sides (9)

with a tapered bore inner ring extended on both sides, for adapter sleeve mounting (10)

with a standard inner ring for locating by interference fit on the shaft (11)

6 7

8 9

10

11

27

A

Bearing basics

Angular contact ball bearings ( page 475)single row

basic design for single mounting design for universal matching (12)

superprecision single row1)basic design

open or with contact sealshighspeed design

open or with contact seals (13)highcapacity design

open or with contact seals

double row with a onepiece inner ring (14)

open basic design with shields with contact seals

with a twopiece inner ring

fourpoint contact ball bearings (15)

Self-aligning ball bearings ( page 537)with a cylindrical or tapered bore

open basic design (16) with contact seals (17)

1) Refer to product information available online at skf.com/superprecision or separate catalogue.

12

13

14

15

16 17

28
http://skf.com/super-precision


with an extended inner ring (18)

Cylindrical roller bearings ( page 567)single row

NU design (19) with one or two angle rings

N design (20)

single row NJ design (21)

with an angle ringNUP design (22)

single row highcapacity

NCF design (23)NJF designNUH design

double row1)with a cylindrical or tapered bore

NNU design (24) NN design (25) NNUP design

1) Refer to product information available online at skf.com/bearings or separate catalogue.

23

19 20

21 22

24 25

18

29

A
http://skf.com/bearings

Bearing basics

Cylindrical roller bearings (cont .)fourrow1)

with a cylindrical or tapered bore open design (26) with contact seals

full complement cylindrical roller bearings single row

NCF design (27) NJG design (28)

double rowwith integral flanges on the inner ring (29)with integral flanges on the inner and outer rings with contact seals (30)

Needle roller bearings ( page 673)needle roller and cage assemblies

single row (31)double row (32)

drawn cup needle roller bearings, open endssingle and double row

open basic design (33)with contact seals (34)


26

27 28

29 30

31 32

33 34

30


drawn cup needle roller bearings, closed endsingle and double row

open basic design (35) with a contact seal (36)

needle roller bearings with flanges single and double row

without an inner ring (37) with an inner ring

open basic design with contact seals (38)

needle roller bearings without flanges single and double row

with an inner ring (39) without an inner ring (40)

alignment needle roller bearings without an inner ring with an inner ring (41)

combined needle roller bearingsneedle roller / angular contact ball bearings

single direction (42) double direction (43)

41

35 36

37 38

39 40

42 43

31

A

Bearing basics

Needle roller bearings (cont .)needle roller / thrust ball bearings

with a full complement ball set (44)with a cageguided ball set

with or without (45) a cover

needle roller / cylindrical roller thrust bearings

without a cover (46) with a cover (47)

Tapered roller bearings ( page 797)single row

single bearings (48)matched bearings

facetoface (49) backtoback tandem

double row1)TDO configuration (backtoback) (50) TDI configuration (facetoface) (51)

fourrow1)TQO configuration

open design (52)with contact seals

TQI configuration

52

44 45

46 47

48 49

50 51


32


Spherical roller bearings ( page 879)with a cylindrical or tapered bore

open basic designs (53) with contact seals (54)for vibratory applications

CARB toroidal roller bearings ( page 957)with a cylindrical or tapered bore

with a cageguided roller set (55) with a full complement roller set

with contact seals (56)

Thrust bearingsThrust bearings accommodate loads that are predominantly in the direction of the shaft. The bearings are typically classified by the type of rolling elem ent and shape of the raceways.

Thrust ball bearings ( page 1009)single direction

with a flat housing washer (57) with a sphered housing washer with (58) or without a sphered seat washer

double direction with flat housing washers (59) with sphered housing washers

with (60) or without seat washers

53 54

55 56

57 58

59 60

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A

Bearing basics

Angular contact thrust ball bearings1)

superprecision bearings single direction

basic design for single mounting (61) design for universal matching matched bearings (62)

double direction basic design (63) highspeed design (64)

Cylindrical roller thrust bearings ( page 1037)single direction

single row (65) double row (66)

double directioncomponents

cylindrical roller and cage thrust assemblies shaft and housing washers

Needle roller thrust bearings ( page 1057)single direction

needle roller and cage thrust assemblies (67)needle roller thrust bearings with a centring flange (68) universal washers thin universal washers

double direction

Spherical roller thrust bearings ( page 1077)single direction (69)

61 62

63 64

65 66

67 68

69

1) Refer to product information available online at skf.com/superprecision or separate catalogue.

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http://skf.com/super-precision


Track runner bearingsTrack runner bearings ( page 1099) are bearings with a thick walled outer ring. These readytomount units are used in all types of cam drives, tracks and conveyor systems.

Tapered roller thrust bearings1)

single direction with or without (70) a cover screw down bearings

double direction (71)

Cam rollers single row (72)double row (73)

Support rollers without flange rings

with or without contact seals without an inner ring with an inner ring (74)

with flange rings, based on needle roller bearings

with or without contact seals with a cageguided roller set (75) with a full complement roller set

74

75

70 71

72 73


35

A

Bearing basics

Support rollers (cont .)with flange rings, based on cylindrical roller bearings

with labyrinth seals (76) with contact seals (77) with lamellar seals

Cam followers based on needle roller bearings

with or without contact seals with a concentric seat (78) with an eccentric seat collar with a cageguided roller set (78) with a full complement roller set

based on cylindrical roller bearingswith labyrinth seals (79)with contact sealswith a concentric seat (79) with an eccentric seat collar

78

79

76 77

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CagesWith the exception of full complement bearings, all rolling bearings contain a cage. The number of cages depends on the number of ball or roller sets within the bearing and on the cage design. The primary purposes of a cage are:

Keeping the rolling elements at a proper distance from each other to reduce the frictional moment and frictional heat in the bearing. Keeping the rolling elements evenly spaced

to optimize load distribution and enable quiet and uniform operation. Guiding the rolling elements in the unloaded

zone, to improve the rolling conditions and to prevent damaging sliding movements. Retaining the rolling elements of separable

bearings when one bearing ring is removed during mounting or dismounting.

Cages are mechanically stressed by frictional, strain and inertial forces. They can also be chemically stressed by certain lubricants, lubricant additives or byproducts of their ageing, organic solvents or coolants. Therefore, the design and material of a cage have a significant influence on the suitability of a rolling bearing for a particular application. Therefore, SKF has developed a variety of cages, made of different materials, for the different bearing types.

In each product chapter, information about standard cages and possible alternatives is provided. If a bearing with a nonstandard cage is required, check availability prior to ordering.

Cages can be classified according to the manufacturing process and material group into:

stamped metal cagesmachined metal cages polymer cages

Stamped metal cagesStamped metal cages for SKF bearings ( fig. 6) are generally made of sheet steel and with some exceptions, of sheet brass. Depending on the bearing type, the following stamped metal cages are available:

a ribbontype cage (a) a riveted cage (b) a snaptype cage (c) a windowtype cage (d)

Stamped metal cages are lightweight. They provide ample space inside the bearing to maximize the effects of the lubricant.

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Documents

Rolling bearings - bearingsandindustrialsupply.com Ybearings with a tapered bore on an adapter sleeve, ... 8.4 Spherical roller bearings on an adapter sleeve ... 16.3 Adapter sleeves