This standard BS EN ISO 888:2018 Fasteners. Bolts, screws and studs. Nominal lengths and thread lengths is classified in these ICS categories:
21.060.10 Bolts, screws, studs
ISO 888:2012 specifies lengths and thread lengths for bolts, screws and studs for use in appropriate product standards and other relevant documents, e.g. for parts per drawing. It applies to bolts, screws and studs with ISO metric screw thread according to ISO 68-1.