Slot
Countersunk head
Raised countersunk head
Countersunk head square neck
Countersunk head with nib
Square countersunk head
Countersunk Cheese head
T-head countersunk
Reduced shank
Normal shank
Full thread
Semitubular end
GB/T 11-1988
Flat countersunk nib bolts
GB/T 800-1988
Countersunk head bolts with double nibs
GB/T 11-2013
GB/T 800-2020