This standard BS EN ISO 4033:2023 Fasteners. Hexagon high nuts (style 2) is classified in these ICS categories:
21.060.20 Nuts
This document specifies the characteristics of hexagon high nuts (style 2), in steel and stainless steel, with metric coarse pitch thread M5 to M39, and with product grades A and B. 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.