BS 4174-20-1972
Type AB cross recessed with type Z recess dimensions for flange head tapping screw-Table 20
BS 4174-20-1972
Type B cross recessed with type Z recess dimensions for flange head tapping screw-Table 20
BS 4174-20-1972
Type A cross recessed with type Z recess dimensions for flange head tapping screw-Table 20
BS 4174-20-2013
Type AB cross recessed with type Z recess dimensions for flange head tapping screw-Table 20
BS 4174-20-2013
Type B cross recessed with type Z recess dimensions for flange head tapping screw-Table 20
BS 4174-2013
Type A cross recessed with type Z recess dimensions for flange head tapping screw-Table 20