BS EN ISO 7046-1:2011 Countersunk flat head screws (common head style) with type H or type Z cross recess. Product grade A. Steel of property class 4.8
2011BS EN ISO 7046-1:2011 Countersunk flat head screws (common head style) with type H or type Z cross recess. Product grade A. Steel of property class 4.8
0000 BS EN ISO 7046-1:1994
1991BS 7433-2:1991 Cross recessed machine screws - Specification for countersunk flat head screws product grade A and property class 4.8 only