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 1981-11-1991
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 1981-5-2004
80° Countersunk flat head screws with type Z cross recess-Table 5
BS 1981-5-2012
80° Countersunk flat head screws with type Z cross recess-Table 5
BS 1981-5-2017
80° Countersunk flat head screws with type Z cross recess-Table 5
BS 1981-2004
80° Countersunk flat head screws with type Z cross recess(truncated)-Table 7
BS 1981-7-2012
80° Countersunk flat head screws with type Z cross recess(truncated)-Table 7
BS 1981-7-2017
80° Countersunk flat head screws with type Z cross recess(truncated)-Table 7
BS 1981-11-2004
80°Countersunk raised head screws with type Z cross recess(truncated)-Table 11
BS 1981-11-2012
80°Countersunk raised head screws with type Z cross recess(truncated)-Table 11
BS 1981-11-2017
80°Countersunk raised head screws with type Z cross recess(truncated)-Table 11
BS 1981-13-2004
Pan head screws with type Z cross recess-Table 13
BS 1981-13-2012
Pan head screws with type Z cross recess-Table 13
BS 1981-13-2017
Pan head screws with type Z cross recess-Table 13
AN 510-1994
80°cross recessed countersunk flat head screws
AN 510-2002
80°cross recessed countersunk flat head screws
AN 510-2011
80°cross recessed countersunk flat head screws
MIL B87114/2B-1981
90°Sector recessed raised countersunk head screws
