ASTM A325 - Wikipedia

ASTM A325 is an ASTM International standard for heavy hex structural bolts, titled Standard Specification for Structural Bolts, Steel, Heat Treated, ... ASTMA325 FromWikipedia,thefreeencyclopedia Jumptonavigation Jumptosearch ASTMA325isanASTMInternationalstandardforheavyhexstructuralbolts,titledStandardSpecificationforStructuralBolts,Steel,HeatTreated,120/105ksiMinimumTensileStrength.Itdefinesmechanicalpropertiesforboltsthatrangefrom1⁄2to1+1⁄2inches(13to38 mm)indiameter.[1] TheequivalentmetricstandardisASTMA325M,whichistitledStandardSpecificationforStructuralBolts,Steel,HeatTreated830MPaMinimumTensileStrength.ItdefinesmechanicalpropertiesforsizesM12–36.[2] ThisisastandardsetbythestandardsorganizationASTMInternational,avoluntarystandardsdevelopmentorganizationsthatsetstechnicalstandardsformaterials,products,systems,andservices. In2016,ASTMofficiallywithdrewspecificationA325andreplaceditwithASTMF3125.[3]Tominimizeconfusion,boltheadmarkingsareunchangedandthedesignationA325isretainedasagradenamewithinthenewstandard.[4]In1951,A325boltswererecognizedasequivalenttoahotdrivenASTMA141rivet.[5] Contents 1Types 2Connectiontypes 3Mechanicalproperties 3.1Mechanicalproperties,imperial 3.2Mechanicalproperties,metric 4Seealso 5References Types[edit] Thetypereferstothetypeofmaterialusedtomakethebolt.Thestandardcurrentlydefinestwotypes,howeveritpreviouslydefinedthefollowingthree:[6] Type1:Mediumcarbonsteel,boronsteel,ormediumcarbonalloysteel Type2:Lowcarbonmartensiticsteel[7](withdrawnfromthestandardin1991) Type3:Weatheringsteel ThereisalsoaTversion,whichisusedtorefertofullythreadedbolts.[6] Notethatindependentofthematerialtheboltisquenchedandtempered.[7] Connectiontypes[edit] Therearealsothreeconnectiontypesdefined:[6] SC:Aslipcriticalconnection. N:Abearingtypeconnectionwherethethreadsareontheshearplane. X:Abearingtypeconnectionwherethethreadsarenotontheshearplane. Mechanicalproperties[edit] Mechanicalproperties,imperial[edit] Thesetypesofboltsaredesignedtobetightenedtoneartheirproofstrength,inordertocreatesignificantbolttension.Thestandardstatesthattheboltsmustbetightenedtoatleast70%ofthetensileyieldstrength.Theseboltsusethesamematerialastheircommoncousins(ASTMF568Mformetricbolts),buthaveathickerandwiderheadtomoreeffectivelydistributetheload.Thismodifiedgeometryisoftenreferredtoasheavyhexgeometry.[8]NutsmustmeetASTMA563,whichalsousesheavyhexgeometry.[9]DimensionsofheavyhexgeometryareperdocumentANSI/ASMEB18.2.6,whichuses"coarse"threadsasdefinedbyUnifiedThreadStandard. ASTM325boltscanbeconsideredequivalenttoGrade8.8boltsaccordingtoASTMF568M.[citationneeded] Forahigherstrengthversionofthistypeofbolt,seeASTMA490. Headmarkingsandmechanicalpropertiesforimperialsizes[7] Headmarking Grade Nominalsizerange[in] Proofstrength[ksi] Yieldstrength(min)[ksi] Tensilestrength(min)[ksi] Corehardness[Rockwell][10] or[10] Type1 1⁄2–1(inc.) 85 92 120 C24–35 1–1+1⁄2 74 81 105 C19–31 Type2 1⁄2–1 85 92 120 C24–35 [11] Type3 1⁄2–1 85 92 120 C24–35 1–1+1⁄2 74 81 105 C19–31 Mechanicalproperties,metric[edit] Headmarkingsandmechanicalpropertiesformetricsizes[8] Headmarking Grade Nominalsizerange[mm] Proofstrength[MPa] Yieldstrength(min)[MPa] Tensilestrength(min)[MPa] Corehardness[Rockwell] Type1 12–36[2] 600 660 830 C23–34 Type2 Type3 /mm Seealso[edit] ASTMF568M References[edit] ^ASTMA325-09,retrieved2009-06-13. ^abASTMA325M-09,retrieved2009-06-13. ^"A325StructuralBolts".PortlandBolt.Retrieved2019-01-18. ^Shaw,RobertE.Jr.(Nov2015)."NewTwistsandTurns".STRUCTUREMagazine. ^ResearchCouncilonStructuralConnections(Jan1951),SpecificationsforAssemblyofStructuralJointsUsingHighTensileSteelBolts,AmericanInstituteofSteelConstruction ^abc"ASTMA325-PortlandBolt".Retrieved2009-06-13.. ^abcASTM,SAEandISOgrademarkingsandmechanicalpropertiesforsteelfasteners,retrieved2009-06-06. ^ab"Metricstructuralfasteners".UniversityofIowa.Archivedfromtheoriginalon1999-04-21.Retrieved2009-06-06.. ^Kulak,GeoffreyL.(2001).GuidetoDesignCriteriaforBoltedandRivetedJoints(PDF)(2nd ed.).AmericanInstituteofSteelConstruction.p. 37.ISBN 978-1564240750. ^abGradeMarkings:CarbonSteelBolts,retrieved2009-05-30. ^Othermarkingsmaybeusedtodenoteatmosphericcorrosionresistantmaterial vteASTMStandardsListofASTMInternationalstandardsSelectedstandardsA ASTMA53 ASTMA325 ASTMA354 ASTMA490 ASTMA500 ASTMA992 D ASTMD5800 E ASTME1714 F ASTMF568M ASTMF883 Related ASTMInternationalAwardofMerit CharlesBenjaminDudley ASTMSubcommitteeE20.02onRadiationThermometry Retrievedfrom"https://en.wikipedia.org/w/index.php?title=ASTM_A325&oldid=1007321372" Categories:ASTMstandardsScrewsHiddencategories:AllarticleswithunsourcedstatementsArticleswithunsourcedstatementsfromJanuary2019 Navigationmenu Personaltools NotloggedinTalkContributionsCreateaccountLogin Namespaces ArticleTalk English Views ReadEditViewhistory More Search Navigation MainpageContentsCurrenteventsRandomarticleAboutWikipediaContactusDonate Contribute HelpLearntoeditCommunityportalRecentchangesUploadfile Tools WhatlinkshereRelatedchangesUploadfileSpecialpagesPermanentlinkPageinformationCitethispageWikidataitem Print/export DownloadasPDFPrintableversion Languages Addlinks