NF E63-112

<p>ISO 8020 specifies the basic dimensions and tolerances, in millimetres, of punches with cylindrical head and straight or reduced shank.</p> <p>Cylindrical head punches with reduced shank are standardized in round, oblong, square and rectangular shapes.</p> <p>This International Standard gives examples of materials and their hardness and specifies the designation of punches in accordance with this International Standard.</p> <p>These punches are available with shank diameters from 3 mm to 32 mm.</p> <p>The main use of the punches specified in ISO 8020 is for punching holes in steel sheet. They may also be used for punching in other materials.</p>