Historical
BS EN ISO 4032:2001
Hexagon nuts, style 1. Product grades A and B (British Standard)
This International Standard specifies the characteristics of hexagon nuts, style 1, with threads from M1.6 up to 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.
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British Standards Institution [bsi]
British Standards Institution [bsi]