ASME-B18.21.1-2009_Plain-Washer

/\.,ASME818.21.12009./WASHERS:HELICALSPRING-LOCK,TOOTHLOCK,ANDPLAINWASHERS(INCHSERIES)IFINOTE:~..ASME818.21.1-2009isreprintedwiththepermissionofitspublisher,TheAmericanSocietyofMechanicalEngineers,ThreeParkAvenue,NewYork,NY10016-5990,U.S.A,(#0through3in.),tooth-lockwashers(#2through1-3/4in.),andplainwashers(#0through3in.).1.1.2TheinclusionofdimensionaldatainthisStandardisnotintendedtoimplythatallproductsde­scribedarestockproductionitems.Consumersshouldconsultwithsuppliersconcerningtheavailabilityofproducts.NOTE:ThewordlockappearinginthenamesofproductsinthisStandardisagenerictermhistoricallyassociatedwiththeiridentificationandisnotintendedtoimplyanindefinitepermanencyoffixityinattach­mentswherethefastenersareused.1.2ComparisontoISOStandardsNocomparableISOstandardsexistfortheseparts.1.3Types1.3.1HelicalSpring-LockWashers.ThisStandardcovershelicalspring-lockwashersofthefollowingsections:regular,heavy,extraduty,andhigh-collar.1.3.2Tooth-LockWashers.ThisStandardcoverstooth-lockwashersofthefollowingtypes:internaltooth,externaltooth,countersunkexternaltooth,internal/externaltooth,andoftwoconstructions,desig­natedTypesAandS.1.3.3PlainWashers.ThisStandardcoversplain(flat)washersofthreeconstructionsdesignatedTypeA,TypeS,andFenderwashers.1.4DimensionsAlldimensionsinthisStandardaregivenininchesandareapplicablebeforeanycoatingisap-plied.1.5ResponsibilityforModificationsThewashermanufacturersshallnotbeheldresponsibleformalfunctionsofproductdeterminedtobeduetoplatingorothermodificationswhensuchplatingormodificationisnotperformedunderthecontrolordirectionofthemanufacturer.1.6TerminologyFordefinitionsoftermsrelatingtowashersorfeaturesthereofusedinthisStandard,refertoASME818.12.I©2011IndustrialFastenersInstitutePage8071..WASHERS1.7ReferencesWASHERS:HELICALSPRING-LOCK,TOOTHLOCK,ANDPLAINWASHERS(INCHSERIES)ASME818.21.12009Foracompletelistofreferencedstandards,seetheSTANDARDSANDSPECIFICATIONREFER­ENCELISTonPage1127.1.8LotForallinspectionsreferencedinthisStandard,thelotshallconsistofallwashersofonetype,grade,style,finish,andsizefabricatedbythesameproductionprocessfromthesameheatnumberofmetalasprovidedbythemetalmanufacturer,andsubmittedforinspectionandtestingatthesametime.Themaximumlotsizeshallberestrictedtooneshiftofproduction.1.8.1Unlessotherwisespecifiedbythepurchaser,unhardenedplainwashers(seepara.1.3.3)donotrequirelotcontrolorheatcontrolandarenotsubjecttothemaximumlotsizerequirement.NOTE:Itiscommontoproduceunhardenedplainwashersfromscrapsteelthatdoesnotnormallyhavematerialheattraceability.1.9InspectionandQualityAssuranceUnlessotherwisespecified,acceptabilityofthisStandardshallbeevaluatedinaccordancewithASME818.18.2.2GENERALDATAFORHELICALSPRING-LOCKWASHERS2.1Application:HelicalSpring-LockWashersThehelicalspring-lockwasherscoveredinthisStandardareintendedforgeneralapplications.He­licalspring-lockwasherscompensatefordevelopedloosenessbetweencomponentpartsofanassembly,andprovideahardenedbearingsurface.2.2Dimensions:HelicalSpring-LockWashersThedimensionsofregular,extraduty,andhigh-collarhelicalspring-lockwashersshallbespecifiedinTables1through4.Selectionshouldbemadefromtheregular,heavy,extraduty,orhigh-collarseriesinTables1,2,3,and4,respectively,tosuitdesignrequirements.2.3MaterialandHardness:HelicalSpring-LockWashers.2.3.1MaterialComposition:HelicalSpring-LockWashers.Washersshallbemadefrommaterialmeetingthechemicalcompositionrequirementsofoneofthefollowingstandards:a.CarbonSteel.SAEJ4031055-1065(UNSG10550-G10650).b.BoronSteel.SAEJ41110855-10865.c.StainlessSteel.SAEJ405302-305(UNSS30200-S30500)orSAEJ405316(UNSS31600).d.AluminumAlloy.ASTM8211,Alloy7075(UNSA97075).e.Phosphor-Bronze.ASTM8159,CopperAlloyNo.510(UNSC51000).f.Silicon-Bronze.ASTM899,CopperAlloyNo.651or655(UNSC65100orC65500).g.Nickel-Capper-Aluminum.FederalSpecificationQQ-N-286(UNSN05500).h.AlloySteel.SAEJ4044037(UNSG40370)orotheralloysteelhavingatleast0.35%carbon.Othermaterialsandgradesshallbeasagreeduponbythesupplierandpurchaser.,IPage808©2011IndustrialFastenersInstituteIWASHERSEXAMPLES:,WASHERS:HELICALSPRING-LOCK,TOOTHLOCK,ANDPLAINWASHERS(INCHSERIES)ASMEB18.21.12009(1)PlainWasher,TypeA,ASME818.21.1,3/8N,0.406x0.812x0.065,302StainlessSteel,PassivationperASTMA380.(2)PlainWasher,Type8,ASMEB18.21.1,1/2W,0.531x1.750x0.100.Steel(UNS105000),hardenedperASTMA436.(3)FenderWasher,ASMEB18.21.1,1/4x1-3/4x0.065,LowCarbonSteel,ZincperASTMF1941,FelZn3A.4.5Workmanship:PlainWashersPlainandFenderwashersshallbefreefromburrs,loosescale,sharpedges,andallotherdefectsthatmightaffecttheirserviceability.UnhardenedplainandfenderwashersshallmeettherequirementsforparallelismandflatnessinASTMF844.TherunoutoftheoutsidediametertotheinsidediametershallnotexceedtheinsidediametertoleranceinTables11through13.NominalWasherSizeNo.0(0.060)No.2(0.086)No.4(0.112)No.6(0.138)No.8(0.164)No.10(0.190)3/16(0.188)No.12(0.216)1/4(0.250)1/4(0.25