ASTMA394TOWERBOLTSisstandardofboltsuseintheconstructionoftransmissiontowers, stasjoner,
andsimilarsteelstructures.Thereare3types: Type0includeshot-dipzinc-coatedboltsmadeoflowor
mediumcarbonsteel, Type1includeshot-dipzinc-coatedboltsmadeofmediumcarbonsteel, bråkjølt
andtempered, Type 2, andType3includesbare, bråkjølt, andtemperedboltsmadeofweatheringsteel.
Steelforthemanufactureofboltsshallbemadebyanyofthefollowingprocesses: peise,
eletric-ovn, orbasic-oxygen.Type1boltsproducedfrommediumcarbonsteelshallbequenchedin
aliquidmediumfromabovetheaustenizingtemperature.Type1boltsproducedfrommediumcarbonsteel
towhichchromium, nikkel, molybden, orboronwereintentionallyaddedshallbequenchedonlyinoil
fromabovetheaustenitizingtemperature.Type3boltsshallbequenchedonlyinoilfromabovethe
austenitizingtemperature.Cold-headedType0boltsshallbestressreliefannealedbeforezinccoatingto
removecoldworkeffectssuchthatthehardnessmeasuredanywhereonthesurfaceorthroughthe
kryss-sectionshallmeettherequirementspecified.Differenttestsshallbeconductedinordertodetermine
thefollowingmechanicalpropertiesofbolts: hardhet, tensilestrength, andshearstrength.
RecommendedNutsforASTMA394TOWERBOLTS
Unlessotherwisespecified, allnutsontheseboltsshallbehexstyleandconformtotherequirementsof
SpecificationA563asfollows.
BoltTypeNutGrade Finish
0 En varm-sinkbelagt
1 DH varm-sinkbelagt
3 DH3 vanlig
RecommendedWashersforASTMA394TOWERBOLTS
SuitablewashersforusewithType0arehot-dipzinc-coatedcarbon-steelwasherswithdimensionsthatare
inaccordancewithSpecificationF436.SuitablewashersforusewithType1boltsarehot-dipzinc-belagte
Type1hardened-steelwashersthatareinaccordancewithSpecificationF436.
SuitablewashersforusewithType3boltsareType3hardened-steelwashersthatareinaccordancewith
spesifikasjon
MaterialsandManufactureofASTMA394TOWERBOLTS
Steelforthemanufactureofboltsshallbemadebyanyofthefollowingprocesses: peise,
elektrisk ovn, orbasic-oksygen.
HeatTreatmentofofASTMA394TOWERBOLTS
Type1boltsproducedfrommediumcarbonsteelshallbequenchedinaliquidmediumfromabovethe
austenizingtemperature.Type1boltsproducedfrommediumcarbonsteeltowhichchromium, nikkel,
molybden, orboronwereintentionallyaddedshallbequenchedonlyinoilfromabovetheaustenitizing
temperature.Type3boltsshallbequenchedonlyinoilfromabovetheaustenitizingtemperature.
ZincCoatings, HotDipofASTMA394TOWERBOLTS
Type0andType1boltsshallbehot-dipzinc-coatedaccordancewiththerequirementsofSpecification
A153 / A153M, exceptthattheminimumaverageweight (tykkelse) ofzinccoatingshallbe1.65oz / ft2
(0,0028in.) Og minimumsvekten for gnistdannelse på en eneste gang skal være 1,50 oz / ft2 (0,0025in.).
