This standard BS ISO 10242-1:2011 Tools for pressing. Punch holder shanks is classified in these ICS categories:
25.120.10 Forging equipment. Presses. Shears
This part of ISO 10242 specifies the interchangeability dimensions and tolerances, in millimetres, of punch holder shanks with neck and flats, type A, intended for use in press tools.
It gives guidance on the materials, and specifies the hardness and designation of punch holder shanks in accordance with this part of ISO 10242.