Designation:B686/B686M−14StandardSpecificationforAluminumAlloyCastings,High-Strength1ThisstandardisissuedunderthefixeddesignationB686/B686M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoversaluminum-alloyhigh-strengthcastingsdesignatedasshowninTable1.1.2Castingscoveredbythisspecificationareintendedforuseinairframe,missile,andothercriticalapplicationswherehighstrength,ductility,andsoundcastingsarerequired.1.3AlloyandtemperdesignationsareinaccordancewithANSIH35.1/H35.1(M).TheequivalentUnifiedNumberingSystemalloydesignationsareinaccordancewithPracticeE527.1.4Unlesstheorderspecifiesthe“M”specificationdesignation,thematerialshallbefurnishedtotheinch-poundunits.1.5Foracceptancecriteriaforinclusionofnewaluminumandaluminumalloysandtheirpropertiesinthisspecification,seeAnnexA1andAnnexA2.1.6Units—ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregularlimitationspriortouse.2.ReferencedDocuments2.1Thefollowingdocumentsoftheissueineffectonthedateofpurchaseformapartofthisspecificationtotheextentreferencedherein:2.2ASTMStandards:2B179SpecificationforAluminumAlloysinIngotandMol-tenFormsforCastingsfromAllCastingProcessesB275PracticeforCodificationofCertainZinc,TinandLeadDieCastingsB557TestMethodsforTensionTestingWroughtandCastAluminum-andMagnesium-AlloyProductsB557MTestMethodsforTensionTestingWroughtandCastAluminum-andMag...
