saej82v002

SAETechnicalStandardsBoardRulesprovidethat:“ThisreportispublishedbySAEtoadvancethestateoftechnicalandengineeringsciences.Theuseofthisreportisentirelyvoluntary,anditsapplicabilityandsuitabilityforanyparticularuse,includinganypatentinfringementarisingtherefrom,isthesoleresponsibilityoftheuser.”SAEreviewseachtechnicalreportatleasteveryfiveyearsatwhichtimeitmaybereaffirmed,revised,orcancelled.SAEinvitesyourwrittencommentsandsuggestions.QUESTIONSREGARDINGTHISDOCUMENT:[phone]FAX:[phone]TOPLACEADOCUMENTORDER;[phone]FAX:[phone]SAEWEBADDRESS—ThisDocumenthasalsochangedtocomplywiththenewSAETechnicalStandardsBoardformat.1.Scope—ThisSAEStandardcoversthemechanicalandqualityrequirementsfortwogradesofcarbonsteel,slotted,andrecessed,82degreesflatcountersunk,82degreesovalcountersunk,pan,fillister,hex,andhexwasherheadmachinescrewsinsizesNo.4through3/4inforuseautomotiveandrelatedindustries.ThedimensionsofthesescrewsarecoveredinASMEB18.6.3.2.References2.1ApplicablePublications—Thefollowingpublicationsformapartofthisspecificationtotheextentspecifiedherein.Unlessotherwiseindicated,thelatestissueofSAEpublicationsshallapply.2.1.1SAEPUBLICATION—AvailablefromSAE,400CommonwealthDrive,Warrendale,PA15096-0001.SAEJ409—ProductAnalysis—PermissibleVariationsfromSpecifiedChemicalAnalysisofaHeatorCastofSteel2.1.2ASMEPUBLICATION—AvailablefromASME,22LawDrive,Box2900,Fairfield,NJ07007-2900.ASMEB18.6.33.Designations—ThetwogradesofmachinescrewsaredesignatedGrade60MandGrade120M,indicating60000and120000psiminimumtensilestrength,respectively.4.MaterialsandProcesses4.1SteelCharacteristics—MachinescrewsshallbemadeofsteelconformingtothedescriptionandchemicalcompositionrequirementsspecifiedinTable1fortheapplicablegrade.SAEJ82RevisedMAY1998-2-4.2HeadingPractice—Machinescrewsshallbecoldheadedand/orextruded,unlessothermethodsarepermittedbyspecialagreementofthepurchaser.4.3ThreadingPractice—Machinescrewsshallberollthreaded,exceptbyspecialagreementofpurchaser.4.4HeatTreatmentPractice—Grade60Mmachinescrewsneednotbeheattreated.Whenspecifiedbypurchaser,Grade60Mscrewsshallbestressrelieved.Grade120Mmachinescrewsshallbeheattreated,oilorwaterquenchedandtemperedataminimumtemperingtemperatureof343°C(650°F).4.5Finish—Unlessotherwisespecified,machinescrewsshallbesuppliedwithanatural(asprocessed)finishunplatedoruncoated.Platedandcoatedfinishesshallbesuppliedinaccordancewithrequirementsofthepurchaser.NOTE—Class2AallowanceinsizesNo.8andsmallermaynotaccommodateacommercialthicknessof0.00015inminimum.Toaccommodatethiscommercialthicknessonthesesmallersizescrews,thebefore-platingsizemayhavetobereduced.Anysuchreductionwillaffectstrengthproperties.WhennecessarytomaintainClass2Alimitsafterplatingofanysizescrew,Class2AGshallbespecified.5.MechanicalRequirements5.1Hardness—MachinescrewsshallhaveahardnessnotinexcessofthemaximumspecifiedinTable2.Screwswhichareexceptedfromtensiletestinginaccordancewith5.2.1and5.2.2shallhaveahardnessnotlessthantheminimumandnotmorethanthemaximumspecifiedinTable2.5.2TensileStrength5.2.1HEXANDHEXWASHERHEADMACHINESCREWS—No.4andNo.5hexandhexwasherheadmachinescrewswhichareshorterthan0.50inarenotsubjecttotensiletesting.No.4andNo.5hexandhexwasherheadmachinescrews0.50inandlongershallmeetthetensileloadrequirementsspecifiedinTable3whenaxiallytensiletestedinaccordancewith6.2.TABLE1—CHEMICALCOMPOSITIONREQUIREMENTS(1)1.Allvaluesareforcheckanalysis(percentbyweight).Forladleanalysis,usestandardpermissiblevariationsasshowninSAEJ409.GradeMaterialandTreatmentElement,%CminElement,%CmaxElement,%P,maxElement,%S,max60MCarbonsteel—0.300.0480.058120MCarbonsteel,quenchedandtempered0.150.550.0480.058TABLE2—MECHANICALREQUIREMENTSGradeTensileStrength,min,psiHardnessRockwellminHardnessRockwellmax60M60000B70B100120M120000C25C38SAEJ82RevisedMAY1998-3-HexandhexwasherheadmachinescrewsinsizesNo.6to3/4ininclusive,whichareshorterthaneither0.50inor3D(whereDisnominalscrewsizeininches)arenotsubjecttotensiletesting.Hexandhexwasherheadmachinescrewsinthesesizesandwithalengththatisbothequaltoorlongerthan0.50in,andalsoatleast3D,shallmeetthetensileloadrequirementsspecifiedinTable3whenwedgetensiletestedinaccordancewith6.3.5.2.2OTHERMACHINESCREWS—Machinescrewswithheadstylesotherthanhexorhexwasherheadwhichareshorterthan0.50in,arenotsubjecttotensiletesting.Suchmachinescrews0.50inandlongershallmeetthetensileloadrequirementsspecifiedinTable3whenaxiallytensiletestedinaccordancewith6.2.6.MethodsofTest6.1Hardness—Thehardnessshallbedeterminedatmid-radiusofatransversesectionthroughthescrewtakenatadistanceofonediameterfromtheendofthescrew.ForscrewssmallerthanNo.10size,arefereetestmaybemadeatmid-radiususingmicrohardnessmeasurementtechniques.TABLE3—TENSILELOADREQUIR