Historical
ISO 4161:1999
Hexagon nuts with flange -- Coarse thread
This International Standard specifies the characteristics of hexagon nuts with flange, with metric coarse threads from M5 to M20 inclusive, of product grade A for threads up to and including M16 and product grade B for threads above 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 261, ISO 898-2, ISO 965-2, ISO 3506-2.
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International Organization for Standardization [iso]
International Organization for Standardization [iso]