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 1981-5-2004
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
AN 505-1959
80°cross recessed countersunk flat head screws
AN 510-1994
80°cross recessed countersunk flat head screws
AN 505-1994
80°cross recessed countersunk flat head screws
AN 505-1995
80°cross recessed countersunk flat head screws
AN 505-1997
80°cross recessed countersunk flat head screws
AN 505-1999
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
