This standard BS EN ISO 8673:2023 Fasteners. Hexagon regular nuts (style 1), with fine pitch thread is classified in these ICS categories:
21.060.20 Nuts
This document specifies the characteristics of hexagon regular nuts (style 1), in steel and stainless steel, with metric fine pitch thread 8 mm to 39 mm, and with product grades A and B. NOTE For nuts with sizes D > 39 mm, see Annex A. If in certain cases other specifications are requested, property classes and stainless steel grades can be selected from ISO 898-2 or ISO 3506-2.
