Case IH FARMALL 45C CVT - Page 39

INTRODUCTION
SAEMarkingsfor
HexNuts
GradeA-B-C
Locknuts
A(NoNotches)B(ThreeMarks)C(SixMarks)
METRICHARDWAREIDENTIFICATIONCHART
Class
5.88.810.9
HexCapScrewand
CarriageBolts
Locatedonthefaceorat,
onthecapofthebolt
Locatedonthefaceorat,
onthecapofthebolt
Locatedonthefaceorat,
onthecapofthebolt
HexNutsand
Locknuts
Locatedonthefaceorat
ofthenut
Locatedonthefaceorat
ofthenut
Locatedonthefaceorat
ofthenut
Metriccapscrewsandnutsareidentiedbythegradenumberstampedontheheadofthe
capscreworonthesurfaceofthenuts.U.S.customarycapscrewsareidentiedbyradial
linesstampedontheheadofthecapscrew.
DEFINITIONS:
1.Break-AwayTorque-T orquemeasuredinthedirectionoftightening,themomentbeforethebolt/nutstartstoturn.
2.ClampingForce-Forceequaltothetensioninthefastenerthatclampsthepartstogether.
3.StabilizedTorque-T orquemeasuredonajointthathashadasettlingtimeafterfastenerinstallation,andthetorque
ismeasuredinthedirectionoftightening,themomentafterthebolt/nutbeginstoturn.
4.ProofLoad-Safetestloadforfasteners,approximately10%belowtheyieldload.
5.Torque-Forceonthewrenchhandletimesthehandlelength.
6.T orqueandTurn-Boltingmethodutilizingatorquesufcienttoclosethejoint,followedbyrotationofaspecic
angletoobtainthedesiredboltstretch.
7.TorquetoYield-Boltingmethodthattightensthejointuntil0.2%yieldisdetected.Generallyrequiresacomputer
monitoredtighteningtool.
8.T argetTorque-T orquespeciedbyengineering,generallynominaltorque.
9.UltimateLoad-Loadwhenboltfailureoccurs.
10.YieldLoad-Loadwhen0.2%deformationoccurs.
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