Round head
Flat round head
Cheese
T-head
Cup head square neck
Cup head nib
Cup oval neck
Low cheese head
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