Designation:A307−14´1StandardSpecificationforCarbonSteelBolts,Studs,andThreadedRod60000PSITensileStrength1ThisstandardisissuedunderthefixeddesignationA307;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.ε1NOTE—Section7.3waseditoriallycorrectedinMay2017.1.Scope*1.1Thisspecification2coversthechemicalandmechanicalrequirementsoftwogradesofcarbonsteelboltsandstudsinsizes1⁄4in.through4in.Thefastenersaredesignatedby“Grade”denotingtensilestrengthandintendeduse,asfollows:GradeDescriptionGradeABolts,studs,andthreadedrodhavingaminimumtensilestrengthof60ksiandintendedforgeneralapplications,GradeBBolts,studs,andthreadedrodAhavingatensilestrengthof60to100ksiandintendedforflangedjointsinpipingsystemswithcastironflanges,andGradeCReplacedbySpecificationF1554Gr.36AThreadedrodisnotusuallyproducedtoGradeB,butcanbewhenspecifiedbythepurchaser.1.2Thisspecificationdoesnotcoverrequirementsformachinescrews,threadcutting/formingscrews,mechanicalexpansionanchorsorsimilarexternallythreadedfasteners.1.3SuitablenutsarecoveredinSpecificationA563.Unlessotherwisespecified,thegradeandstyleofnutforeachgradeoffastener,ofallsurfacefinishes,shallbeasfollows:FastenerGradeandSizeNutGradeandStyleAA1⁄4to11⁄2in.A,hexAover11⁄2to4in.A,heavyhexB,1⁄4to4in.A,heavyhexANutsofothergradesandstyleshavingspecifiedproofloadstresses(Specifica-tionA563,Table3)greaterthanthespecifiedgradeandstyleofnutarealsosuitable.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5SupplementaryRequirementS1ofanoptionalnatureisprovided,whichdescribesadditionalrestrictionstobeappliedwhenboltsaretobewelded.Itshallapplyonlywhenspecifiedintheinquiry,order,andcontract.1.6Termsusedinthisspecif...
