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STEEL STRUCTURE BOLTS
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GB/T 1231-2006 standard:
BOLT DIMENSION
d 16 20 22 24 27 30 S 27 34 36 41 46 50 k 10 12.5 14 15 17 18.5 L 45-130 50-160 55-220 60-240 65-260 70-260
★We can produce the scope of the standard:
GB/T1231-2006;
FN14399-3,4:2005;
ISO7412;
DIN6914~6916;
JISB1186;
AS1252;
ASMEB18.2.6(ASTM A325,A490)
Material:20MnTiB;35VB;35K;45K;4OCr;35CrMoA;Tayp 1;Tayp 3
ACCORDING TO THE PERFORMANCE GRADES OF HIGH-STRENGTH BOLTS,THEY ARE DIVIDED INTO 8.8,10.9 AND 12.9,OF WHICH THE TORSIONAL SHEAR TYPE IS ONLY USED IN 10.9. IN THE MARKING METHOD,THE NUMBER BEFORE THE DECIMAL POINT REPRESENTS THE TENSILE STRENGTH AFTER HEAT TREATMENT,AND THE NUMBER AFTER THE DECIMAL POINT REPRESENTS THE YIELD RATIO,THAT IS,THE RATIO OF THE MEASURED YIELD STRENGTH TO THE MEASURED ULTIMATE TENSILE STRENGTH. GRADE 8.8 INDICATES THAT THE TENSILE STRENGTH OF THE BOLT ROD IS NOT LESS THAN 800MPA, AND THE YIELD RATIO IS 0.8; GRADE 10.9 INDICATES THAT THE TENSILE STRENGTH OF THE BOLT ROD IS NOT LESS THAN 1000MPA, AND THE YIELD RATIO IS 0.9. IN STRUCTURAL DESIGN,THE DIAMETER OF HIGH-STRENGTH BOLTS IS GENERALLY M16/M20/M22/M24/M27/M30.HOWEVER,M22/M27 IS THE SECOND CHOICE. NORMALLY, M16/M20/M24/M30 IS THE MAIN CHOICE.
STEEL STRUCTURE BOLTS
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