WORLDWIDEFASTENERSTANDARDDate:2003-02-01

WA951

MaterialRequirementsandMechanicalPropertiesofBolts,Studs,andBoltWasherAssemblies,Powertrain

Division–HighDutyFasteners

1.SCOPE.

Thisstandardspecifiesdesigninformationrelatingtomechanical,material,geometric,andmanufacturing

requirementsforbolts,studs,andboltwasherassembliesforuseinPowertrainapplications.

NOTE:AllrequirementsofWA900andWA950applyunlessotherwisespecifiedinthisstandard.

2.REFERENCES.

ISO898/1Mechanicalpropertiesoffasteners-Part1:Bolts,screws,andstuds.

ISO6157/3Fasteners-Surfacediscontinuities-Part3:Bolts,screws,andstudsforspecial

requirements.

WA900DimensionalRequirementsforHexagonBolts,FlangedHexagonBoltsand

BoltWasherAssemblies.

WA950MaterialRequirementsandMechanicalPropertiesofBolts,Studs,and

BoltWasherAssemblies.

3.PERFORMANCEREQUIREMENTS.

Samplingfrequencyfortorque/tensiontestingperWZ100orWZ101(asrequiredbyfinishspecificationsin

WX100)tobeasindicatedonthecontrolplan.

4.MECHANICALREQUIREMENTS.

WedgetensiletestperISO898,part1,clause8.5,(asreferencedbyWA950)excepttobeperformedwith

10°wedgeforallfastenerscoveredbythisspecification.

5.MATERIALREQUIREMENTS.

5.1Decarburizationisallowable(perISO898,part1,clause8.8,asreferencedbyWA950)except

thattheminimumheightofthezoneofbasemetal(dimensionE,ISO898/1,Figure6)forproperty

class8.8fastenerstobe2/3ofbasicthreaddepth,(ass