GB/T 8-1988
Square head bolts
GB/T 35-1988
Small square head bolts
Q 194B-1999
Small square head bolts
JIS E1107-5b-2008
square head bolts for fish plate-Table 5b
JIS E1107-5b-2012
square head bolts for fish plate-Table 5b
GB/T 35-2013
Small square head bolts
Q 194B-2012
Small square head bolts
IS 2585-1968
Square head bolts
ASME/ANSI B18.2.3.10M-1996
Metric square head bolts with reduced shank
ASME/ANSI B18.2.3.10M-2003
Metric square head bolts with reduced shank
MS 9397-2000
Square countersunk head bolt
MS 9432-1962
Square countersunk head bolt
GB/T 8-2021
Square head bolts