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ASTMA325FromWikipedia,thefreeencyclopedia

ASTMA325isanASTMInternationalstandardforheavyhexstructuralbolts,titledStandardSpecificationforStructuralBolts,Steel,HeatTreated,120/105ksiMinimumTensileStrength.Itdefinesmechanicalpropertiesforboltsthatrangefrom12to112indiameter.[1]

TheequivalentmetricstandardisASTMA325M,whichistitledStandardSpecificationforStructuralBolts,Steel,HeatTreated830MPaMinimumTensileStrength.ItdefinesmechanicalpropertiesforsizesM1236.[2]

ThereisalsoaTversion,whichisusedtorefertofullythreadedbolts.[3]

ThisisastandardsetbythestandardsorganizationASTMInternational,avoluntarystandardsdevelopmentorganizationsthatsetstechnicalstandardsformaterials,products,systems,andservices.

Contents

1Types2Connectiontypes3Mechanicalproperties4References

Types

Thetypereferstothetypeofmaterialusedtomakethebolt.Thestandardcurrentlydefinestwotypes,howeveritpreviouslydefinedthefollowingthree:[3]

Type1:Mediumcarbonsteel,boronsteel,ormediumcarbonalloysteelType2:Lowcarbonmartensiticsteel[4](withdrawnfromthestandardin1991)Type3:Weatheringsteel

Notethatindependentofthematerialtheboltisquenchedandtempered.[4]

Connectiontypes

Therearealsothreeconnectiontypesdefined:[3]

SC:Aslipcriticalconnection.N:Abearingtypeconnectionwherethethreadsareontheshearplane.X:Abearingtypeconnectionwherethethreadsarenotontheshearplane.

Mechanicalproperties

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Thesetypesofboltsaredesignedtobetightenedtoneartheirproofstrength,inordertocreatesignificantbolttension.Thestandardstatesthattheboltsmustbetightenedtoatleast70%ofthetensilestrength.Theseboltsusethesamematerialastheircommoncousins(ASTMF568Mformetricbolts),buthaveathickerandwiderheadtomoreeffectivelydistributetheload.Thismodifiedgeometryisoftenreferredtoasheavyhexgeometry.[5]

ASTM325boltscanbeconsideredequivalenttoGrade8.8boltsaccordingtoASTMF568M.

Forahigherstrengthversionofthistypeofbolt,seeASTMA490.

Headmarkingsandmechanicalpropertiesforimperialsizes[4]

Headmarking Grade Nominalsizerange[in]

Proofstrength[ksi]

Yieldstrength

(min)[ksi]

Tensilestrength(min)

[ksi]

Corehardness[Rockwell][6]

or

[6]

Type1

121(inc.) 85 92 120 C2435

1112 74 81 105 C1931

Type2

121 85 92 120 C2435

[7] Type3

121 85 92 120 C2435

1112 74 81 105 C1931

Headmarkingsandmechanicalpropertiesformetricsizes[5]

Headmarking Grade

Nominalsizerange[mm]

Proofstrength[MPa]

Yieldstrength(min)[MPa]

Tensilestrength(min)[MPa]

Corehardness[Rockwell]

Type1

1236[2] 600 660 830 C2334Type2

Type3

References1. ASTMA32509(http://www.astm.org/Standards/A325.htm),retrieved20090613.

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Categories: ASTMstandards Screws

Thispagewaslastmodifiedon10May2014,at12:37.TextisavailableundertheCreativeCommonsAttributionShareAlikeLicenseadditionaltermsmayapply.Byusingthissite,youagreetotheTermsofUseandPrivacyPolicy.WikipediaisaregisteredtrademarkoftheWikimediaFoundation,Inc.,anonprofitorganization.

2. ASTMA325M09(http://www.astm.org/Standards/A325M.htm),retrieved20090613.3. ASTMA325(http://www.portlandbolt.com/technicalinformation/astm/ASTM_A325.html),retrieved

20090613.4. ASTM,SAEandISOgrademarkingsandmechanicalpropertiesforsteelfasteners

(http://www.americanfastener.com/technical/grade_markings_steel.asp),retrieved20090606.5. Metricstructuralfasteners(http://www.icaen.uiowa.edu/~sdesign1/Text/fasteners_si.html),retrieved

20090606.6. GradeMarkings:CarbonSteelBolts(http://www.fastspecinc.com/technical/technical.html),retrieved

20090530.7. Othermarkingsmaybeusedtodenoteatmosphericcorrosionresistantmaterial