Round head
Countersunk head
Raised countersunk head
Round head with collar
Undercut countersunk head
Raised Undercut countersunk head
Low cheese head
Raised cheese
BS 1981-5-1991
80° Countersunk flat head screws with type Z cross recess-Table 5
BS 1981-7-1991
80° Countersunk flat head screws with type Z cross recess(truncated)-Table 7
BS 1981-9-1991
80°Countersunk raised head screws with type Z cross recess-Table 9
BS 1981-11-1991
80°Countersunk raised head screws with type Z cross recess(truncated)-Table 11
BS 1981-13-1991
Pan head screws with type Z cross recess-Table 13
BS 1981-15-1991
Recessed raised cheese head screws with type Z cross recess-Table 15
BS 450-2-1958
Cross recessed 90° countersunk flat head screws-Table 2
BS 450-3-1958
Cross recessed 90° oval countersunk flat head screws-Table 3
BS 450-5-1958
Cross recessed pan Head Screws-Table 5
BS 450-7-1958
Cross recessed cheese head screws-Table 7
BS 450-8-1958
Cross recessed mushroom Head Screws-Table 8
BS 450-11-1958
Cross recessed 90° countersunk flat head screws-Table 11
BS 450-12-1958
Cross recessed 90° oval countersunk flat head screws-Table 12
BS 450-13-1958
Cross recessed round Head Screws-Table 13
BS 450-2-2012
Cross recessed 90° countersunk flat head screws-Table 2
BS 450-2-2017
Cross recessed 90° countersunk flat head screws-Table 2
BS 450-3-2012
Cross recessed 90° oval countersunk flat head screws-Table 3
BS 450-3-2017
Cross recessed 90° oval countersunk flat head screws-Table 3
BS 450-5-2012
Cross recessed pan Head Screws-Table 5
BS 450-5-2017
Cross recessed pan Head Screws-Table 5
