tech line: 1-800-325-8886 moogproblemsolver.com www.FMe-cat.com For parts lookup, visit SOLUTION: PROBLEM: BULLETIN: 27019B–R ©2015 Federal-Mogul Motorparts Corporation. NASCAR is a registered trademark of NASCAR, Inc. MOOG and The Problem Solver are trademarks owned by Federal-Mogul Corporation, or one or more of its subsidiaries, in one or more countries. All other trademarks are the property of their respective owners. All rights reserved. Form# MG27019-R • MOOG ® stud tapers are designed to ensure that the large diameter of the taper always exceeds the large diameter of the mating hole. • The MOOG taper is designed to force contact at the large end of the taper to ensure that the stud does not rock in the tapered hole during service. • MOOG exceeds OEM stud swing by as much as 5 degrees in some applications, with no compromise to pullout strength or stud fatigue life. • MOOG’s additional stud swing helps compensate for slightly worn or bent chassis components in higher mileage vehicles. • Grease grooves help to ensure lubrication flow and enhance component life. Application-Speciﬁc Design Universal Design Approach Correct fit of the stud’s taper to the mating hole is necessary to ensure the fatigue life of the stud. A stud undersized at the large diameter of the taper will increase the stress on the stud (due to an increased lever length). This can lead to a stud fatigue failure. Also, the gap formed with an undersized taper can accumulate moisture and debris, promoting corrosion of the stud and control arm (see below). This corrosion and debris wears the sealing surface of the dust boot, eventually exposing the socket to the elements and shortening the service life. In addition, insufficient stud swing will cause the stud to impact the housing. This will deform the stud or housing, causing alignment issues. In severe cases it can lead to loss of steering due to stud separation caused by stud pullout or stud fatigue. Some suppliers undercut the stud to increase stud swing, removing too much material from the stud, thus weakening it. INDUCTION HARDENED BALL STUD AND TAPER (WHEN REQUIRED) GREASE GROOVES ENSURE FLOW OF LUBRICATION TO ENHANCE ASSEMBLY LIFE APPLICATION-SPECIFIC MANUFACTURING AND HIGHER LOAD RATING THAN OTHER DESIGNS INCORRECT TAPER FIT: CORRECT TAPER FIT: STUD TAPER EXTENDS BEYOND RECEIVING TAPERED HOLE. POCKET IS CREATED WHEN STUD TAPER IS LOCATED BELOW THE RECEIVING HOLE SURFACE. MAY RESULT IN INSUFFICIENT THREADS. INSUFFICIENT STUD SWING CAN LEAD TO A CAM-OUT. CAM-OUT CAN DAMAGE THE HOUSING AND STUD, POTENTIALLY LEADING TO STUD SEPARATION. INCREASES STRESS ON STUD AND CAN LEAD TO A STUD FATIGUE FAILURE. MOOG ® STUD DESIGN STUD EXTENDS, NO GAP

PROBLEM: SOLUTION · tech line: 1-800-325-8886 moogproblemsolver.com For parts lookup, visit PROBLEM: SOLUTION: BULLETIN: 27019B–R ©2015 Federal-Mogul Motorparts Corporation

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tech line: 1-800-325-8886

moogproblemsolver.com

www.FMe-cat.comFor parts lookup, visit

SOLUTION:PROBLEM:

B U L L E T I N : 27 0 1 9 B – R

©2015 Federal-Mogul Motorparts Corporation. NASCAR is a registered trademark of NASCAR, Inc. MOOG and The Problem Solver are trademarks owned by Federal-Mogul Corporation, or one or more of its subsidiaries, in one or more countries. All other trademarks are the property of their respective owners. All rights reserved. Form# MG27019-R

• MOOG® stud tapers are designed to ensure that the largediameter of the taper always exceeds the large diameter of themating hole.

• The MOOG taper is designed to force contact at the large endof the taper to ensure that the stud does not rock in the taperedhole during service.

• MOOG exceeds OEM stud swing by as much as 5 degreesin some applications, with no compromise to pullout strengthor stud fatigue life.

• MOOG’s additional stud swing helps compensate for slightlyworn or bent chassis components in higher mileage vehicles.

• Grease grooves help to ensure lubrication flow and enhancecomponent life.

Application-Specific DesignUniversal Design Approach

Correct fit of the stud’s taper to the mating hole is necessary to ensure the fatigue life of the stud. A stud undersized at the large diameter of the taper will increase the stress on the stud (due to an increased lever length). This can lead to a stud fatigue failure. Also, the gap formed with an undersized taper can accumulate moisture and debris, promoting corrosion of the stud and control arm (see below). This corrosion and debris wears the sealing surface of the dust boot, eventually exposing the socket to the elements and shortening the service life.In addition, insufficient stud swing will cause the stud to impact the housing. This will deform the stud or housing, causing alignment issues. In severe cases it can lead to loss of steering due to stud separation caused by stud pullout or stud fatigue. Some suppliers undercut the stud to increase stud swing, removing too much material from the stud, thus weakening it.

induction hardened ball stud and taper

(when required)

Grease GrooVes ensure Flow oF lubrication to enhance asseMblY liFe

application-speciFicManuFacturinG and hiGher load ratinG than other desiGns

incorrect taper Fit:

correct taper Fit: stud taper extends beYond receiVinG tapered hole.

pocket is created when stud taper is located below the receiVinG hole surFace.

MaY result in insuFFicient threads.

insuFFicient stud swinG can lead to a caM-out.

caM-out can daMaGe the housinG and stud, potentiallY leadinG to

stud separation.

increases stress on stud and can lead to a stud FatiGue Failure.