This part of ISO11900 specifies the dimensions and tolerances, in millimetres, of ball-lock punch retainers, typeA (rectangular) and typeB (square), for light duty, and of their backing plates. The main use of ball-lock punch retainers and their backing plates is the retention of ball-lock punches, in accordance with ISO10071-1, when punching holes in steel sheets.
It gives material guidelines and hardness requirements, and specifies the designation of ball-lock punch retainers in accordance with this part of ISO11900.