Head styles

                         Flat head

A countersunk head with a flat top.  Abbreviated FH. 

                          Oval  head

A countersunk head with a rounded top. 

Abbreviated OH or OV. 

                       Pan head        

A slightly rounded head with short vertical sides.  Abbreviated PN.         

                          Truss head

A extra wide head with a rounded top.

                        Round head

A domed head. Abrreviated RH.

                           Hex head

A hexagonal head. Abbreviated HH or HX

                        Hex washer head

             A hex head with built in washer.

                  Slotted head washer head

A hex head with built in washer and a slot.

                    Socket cap head

A small cylindrical head using a socket drive.

                       Button head

A low profile rounded head using a a socket drive.