This standard BS EN ISO 2009:2011 Slotted countersunk flat head screws. Product grade A is classified in these ICS categories:
21.060.10 Bolts, screws, studs
This International Standard specifies the characteristics of slotted countersunk flat head screws of product grade A and with threads from M1,6 to M10 inclusive.
If, in special cases, specifications other than those listed in this International Standard are required, they can be selected from existing International Standards, for example ISO 261, ISO 888, ISO 898-1, ISO 965-2 and ISO 3506-1.