Designation:A325−14AmericanAssociationStateHighwayandTransportationOfficialsStandardAASHTONo.:M164StandardSpecificationforStructuralBolts,Steel,HeatTreated,120/105ksiMinimumTensileStrength1ThisstandardisissuedunderthefixeddesignationA325;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecification2coverstwotypesofquenchedandtemperedsteelheavyhexstructuralboltshavingaminimumtensilestrengthof120ksiforsizes1.0in.andlessand105ksiforsizesover1.0to11⁄2in.,inclusive.1.2Theboltsareintendedforuseinstructuralconnections.TheseconnectionsarecomparabletothosecoveredundertherequirementsoftheSpecificationforStructuralJointsUsingHigh-StrengthBolts,approvedbytheResearchCouncilonStructuralConnections;endorsedbytheAmericanInstituteofSteelConstructionandbytheIndustrialFastenerInstitute.1.3Theboltsarefurnishedinsizes1⁄2to11⁄2in.,inclusive.Theyaredesignatedbytype,denotingchemicalcompositionasfollows:TypeDescriptionType1Mediumcarbon,carbonboron,ormediumcarbonalloysteel.Type2WithdrawninNovember1991.Type3Weatheringsteel.NOTE1—Boltsforgeneralapplications,includinganchorbolts,arecoveredbySpecificationA449.AlsorefertoSpecificationA449forquenchedandtemperedsteelboltsandstudswithdiametersgreaterthan11⁄2in.butwithsimilarmechanicalproperties.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.NOTE2—AcompletemetriccompaniontoSpecificationA325hasbeendeveloped,SpecificationA325M;therefore,nometricequivalentsarepresentedinthisspecification.1.5Thisspecificationisapplicabletoheavyhexstructuralboltsonly.Forboltsofotherconfigurationsandthreadlengthswithsimilarmechanicalproperties,seeSpecificationA449.1.6TermsusedinthisspecificationaredefinedinTe...
