ISO 10071:1991

Lays down interchangeability dimensions and tolerances in millimetres. Ball-lock punches are standardized in round, square, rectangular and oblong shapes, and dimension ranges are given for these shapes. It also gives materials and hardness as examples, and specifies the designation. The main use of punches defined in this standard is for punching holes in steel sheet. They may also be used for punching holes in other materials.