6-Lobe
Round head
Countersunk head
Raised countersunk head
Hex with collar
Round head with collar
Countersunk head with rib
Bugle head
Raised cheese
Hex chamfered double faces
Full thread
ASME/ANSI B18.6.3-33-2013
Type A 6-Lobe concave hex collar self tapping screws-Table 33