Designation:A490−14aAmericanAssociationStateHighwayandTransportationOfficialsStandardAASHTONo.:M253StandardSpecificationforStructuralBolts,AlloySteel,HeatTreated,150ksiMinimumTensileStrength1ThisstandardisissuedunderthefixeddesignationA490;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcoverstwotypesofquenchedandtempered,alloysteel,heavyhexstructuralboltshavingatensilestrengthof150to173ksi.1.2Theseboltsareintendedforuseinstructuralconnec-tions.TheseconnectionsarecoveredundertherequirementsoftheSpecificationforStructuralJointsUsingSpecificationA325orA490bolts,approvedbytheResearchCouncilonStructuralConnections;endorsedbytheAmericanInstituteofSteelConstructionandbytheIndustrialFastenerInstitute.21.3Theboltsarefurnishedinsizes1⁄2to11⁄2in.,inclusive.Theyaredesignatedbytypedenotingchemicalcompositionasfollows:TypeDescriptionType1MediumcarbonalloysteelType2Withdrawnin2002Type3Weatheringsteel1.4Thisspecificationprovidesthatheavyhexstructuralboltsshallbefurnishedunlessotherdimensionalrequirementsarespecifiedonthepurchaseorder.1.5TermsusedinthisspecificationaredefinedinTermi-nologyF1789unlessotherwisedefinedherein.1.6Formetricbolts,seeSpecificationA490MClasses10.9and10.9.31.7Thevaluesstatedininch-poundunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.8ThefollowingsafetyhazardscaveatpertainsonlytotheTestMethodsportion,Section12ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimita-tionspriortouse.2.ReferencedDocuments2.1ASTMStandards:3A194/A194MSpec...
