Designation:A512−18StandardSpecificationforCold-DrawnButtweldCarbonSteelMechanicalTubing1ThisstandardisissuedunderthefixeddesignationA512;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcoverscold-drawnbuttweldcarbonsteeltubesforuseasmechanicaltubing.1.2Thisspecificationcoversround,square,rectangular,andspecialshapemechanicaltubing.1.3Roundtubesizerangescoveredareoutsidediametersupto31⁄2in.(88.9mm)andwallthicknessfrom0.035to0.500in.(0.89to12.70mm).1.4Optionalsupplementaryrequirementsareprovidedand,whendesired,shallbesostatedintheorder.1.5Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.6Thisproductisavailableinvariousgrades(Section6Tables1and2andconditions(Section5).1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2A370TestMethodsandDefinitionsforMechanicalTestingofSteelProductsA751TestMethods,Practices,andTerminologyforChemi-calAnalysisofSteelProductsA1040GuideforSpecifyingHarmonizedStandardGradeCompositionsforWroughtCarbon,Low-Alloy,andAlloySteels2.2MilitaryStandards:3MIL-STD-129MarkingforShipmentandStorage2.3FederalStandard:Fed.Std.No.123MarkingforShipments(CivilAgencies)33.OrderingInformation3.1Ordersformaterialunderthisspecificationshouldincludethefollowing,asrequired,todescribetherequiredmaterialadequately:3.1.1Quantity(feet,weight(Note1),ornumberoflen...
