This standard BS ISO 10663:2012 Hexagon nuts with flange, style 2. Fine pitch thread is classified in these ICS categories:
21.060.20 Nuts
This International Standard specifies the characteristics of hexagon nuts with flange (style 2), and metric fine pitch thread with nominal thread diameters, D, from 8 mm to 20 mm, in product grade A for D ≤ 16 mm and product grade B for D > 16 mm.
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 724, ISO 898-2, ISO 965-2 and ISO 3506 2.