Round head
Flat round head
Cheese
T-head
Cup head square neck
Cup head nib
Cup oval neck
Low cheese head
GB/T 12-1988
Cup head square neck bolts
GB/T 12-2013
Cup head square neck bolts
ASME/ANSI B18.5.2.2M-1982
Metric round head square neck bolts with reduced shank
ASME/ANSI B18.5.2.2M-1993
Metric round head square neck bolts with reduced shank
ASME/ANSI B18.5.2.2M-2000
Metric round head square neck bolts with reduced shank
ASME/ANSI B18.5.2.2M-2005
Metric round head square neck bolts with reduced shank
GB/T 794-2021
Strengthened cup head square neck bolts-Type B
GB/T 794-1993
Strengthened cup head square neck bolts-Type B