WORLDWIDEFASTENERSTANDARD
WB980Date:2007-08-01
PAINTCLEARINGSCREWS-PERFORMANCE
FOREWORD
DuringtheNovember2005update,Table2andthedesignvariantdiagramswererevised.Designationcharacters
werelinedupwithISOconvention.DimensionMwasincludedforallvariants,dimensionLp(formallyX)wasaligned
withWA900.Noteswereaddedtoclarifythediagramandtablerequirements.VariantGwasadded.
1.SCOPE
ThisspecificationcoverstheperformancerequirementsofISOmetricscrewswithapaintclearingfeature
incorporatedatthescrewpointandwithphysicalpropertiesinaccordancewithWA950.
1.1REFERENCES
WSK-M64J29-C1-C3-Waterborneelectrocoat
WSK-M6J160-A1Primersurfacer,colored,PUmodifiedpolyester,mediumsolid,165oCbakingtemp.
WSK-M50J111-APaint,mediumsolidpolyester,baking,exteriortopcoat.
2.GENERAL
PreferreddesignsofpaintclearingfeatureareshowninClause5.Otherdesignsshallonlybeusedifapprovalis
obtainedfromtheWorldwideFastenerStandardsCommitteepriortotheirintroduction.
3.PERFORMANCETESTING
(Onlyforinitialdesignapprovalandasarefereetestincasesofdispute)
3.1CROSSTHREADINGTEST
Thescrewmustbeinitiallymisalignedwiththecenter-lineofthetestnutthreadby5+/-1andwhen
assemblyisattemptedusinga20+/-1Nendloadthescrewmustnotcrossthread.Thetendency
towardsself-alignmentmustnotbeprevented.
3.2DRIVETEST
Thescrewmustbedrivenintothetestnutwith20+/-1Naxialloaduntilaminimumof3fullformthre