Hex with flange
Round head
Countersunk head
Raised countersunk head
Hex with collar
Round head with collar
Bugle head
UNI 8117
Hexagon head self-drilling tapping screws with collar
UNI 8118
Cross recessed pan head drilling screws with tapping screw thread-type H
UNI 8119
Cross recessed countersunk head drilling screws with tapping screw thread-type H