ASTMA394TOWERBOLTSisstandardofboltsuseintheconstructionoftransmissiontowers, is-orsafoedd,
andsimilarsteelstructures.Thereare3types: Type0includeshot-dipzinc-coatedboltsmadeoflowor
quenched canolcarbonsteel, Type1includeshot-dipzinc-coatedboltsmadeofmediumcarbonsteel
andtempered, Type2, aType3includesbare, quenched, andtemperedboltsmadeofweatheringsteel.
Prosesau Steelforthemanufactureofboltsshallbemadebyanyofthefollowingprocesses: aelwyd agored,
ffwrnais eletric, orbasic-oxygen.Type1boltsproducedfrommediumcarbonsteelshallbequenchedin
aliquidmediumfromabovetheaustenizingtemperature.Type1boltsproducedfrommediumcarbonsteel
towhichchromium, nicel, molybdenwm, orboronwereintentionallyaddedshallbequenchedonlyinoil
fromabovetheaustenitizingtemperature.Type3boltsshallbequenchedonlyinoilfromabovethe
austenitizingtemperature.Cold-headedType0boltsshallbestressreliefannealedbeforezinccoatingto
removecoldworkeffectssuchthatthehardnessmeasuredanywhereonthesurfaceorthroughthe
trawsdoriadauhallmeettherequirementspecified.Differenttestsshallbeconductedinordertodetermine
thefollowingmechanicalpropertiesofbolts: caledwch, tensilestrength, andshearstrength.
ArgymhellirNutsforASTMA394TOWERBOLTS
Oni bai bod rhywun arall yn cael ei nodi, allnutsontheseboltsshallbehexstyleandconformtotherequirementsof
ManylebA563asfollows.
Gorffen BoltTypeNutGrade
0 Gorchudd poeth-dipzinc
1 DH wedi'i orchuddio â poeth-dipzinc
3 plaen DH3
ArgymhellirWashersforASTMA394TOWERBOLTS
Addas peiriannauwasforusewithType0arehot-dipzinc-coatedcarbon-steelwasherswithdimensionsthatare
inaccordancewithSpecificationF436.SuitablewashersforusewithType1boltsarehot-dipzinc-gorchuddio
Type1hardened-durwashersthatareinaccordancewithSpecificationF436.
SuitablewashersforusewithType3boltsareType3hardened-steelwashersthatareinaccordancewith
Manyleb
MaterialsandManufactureofASTMA394TOWERBOLTS
Prosesau Steelforthemanufactureofboltsshallbemadebyanyofthefollowingprocesses: aelwyd agored,
ffwrnais drydan, orbasig-ocsigen.
HeatTreatmentofofASTMA394TOWERBOLTS
Type1boltsproducedfrommediumcarbonsteelshallbequenchedinaliquidmediumfromabovethe
austenizingtemperature.Type1boltsproducedfrommediumcarbonsteeltowhichchromium, nicel,
molybdenwm, orboronwereintentionallyaddedshallbequenchedonlyinoilfromabovetheaustenitizing
tymheredd.Type3boltsshallbequenchedonlyinoilfromabovetheaustenitizingtemperature.
ZincCoatings, HotDipofASTMA394TOWERBOLTS
Type0andType1boltsshallbehot-dipzinc-coatedaccordancewiththerequirementsofSpecification
A153 / A153M, ac eithrio pwysau isafswm (trwch) ofzinccoatingshallbe1.65oz / ft2
(0.0028in.) A'r isafswm pwysauofzinccoatingonanyoneitemshallbe1.50oz / ft2 (0.0025in.).
