Designation:A490M−14aStandardSpecificationforHigh-StrengthSteelBolts,Classes10.9and10.9.3,forStructuralSteelJoints(Metric)1ThisstandardisissuedunderthefixeddesignationA490M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcoverstwotypesofquenchedandtemperedalloysteel,metricheavyhexstructuralboltshavingatensilestrengthof1040to1210MPa.1.2Theseboltsareintendedforuseinstructuralconnec-tionscomparabletothosecoveredundertherequirementsoftheSpecificationforStructuralJointsUsingASTMA325andA490bolts,approvedbytheResearchCouncilonStructuralConnections;endorsedbytheAmericanInstituteofSteelConstructionandbytheIndustrialFastenerInstitute.21.3TheboltsarefurnishedinnominalboltdiametersM12toM36,inclusive.Theyaredesignatedbytypedenotingchemicalcompositionasfollows:TypeDescriptionType1MediumcarbonalloysteelType2Withdrawnin2002Type3Weatheringsteel1.4ThisspecificationisapplicabletometricheavyhexstructuralboltsandalternatedesignsasestablishedbytheResearchCouncilinitspublication,SpecificationforStructuralJointsUsingASTMandbolts.1.5Forinch-poundbolts,seeSpecificationA490.1.6ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.7ThefollowingsafetyhazardscaveatpertainsonlytotheTestMethodsportion,Section13,ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimita-tionspriortouse.2.ReferencedDocuments2.1ASTMStandards:3A325SpecificationforStructuralBolts,Steel,HeatTreated,120/105ksiMinimumTensileStrengthA490SpecificationforStructuralBolts,AlloySteel,HeatTreat...
