Historical
BS EN ISO 4014:2001
Hexagon head bolts. Product grades A and B (British Standard)
This International Standard specifies the characteristics of chamfered hexagon thin nuts, with threads from M1,6 up to and including M64, with product grade A for threads d ≤ M16 and product grade B for threads d › M16.
If, in special cases, specifications other than those listed in this International Standard are required, they should be selected from existing International Standards, for example ISO 724, ISO 898-2, ISO 965-1, ISO 3506-2 and ISO 4759-1.
British Standards Institution [bsi]