This American National Standard covers the design dimensions and tolerances for two, three and four guide post punch press tool all steel die sets referred to in the standard as STANDARD DIE SETS Included in the standard are back post, center post, diagonal post and rectangular two, three and four post all steel die sets, including three (or more) plate die sets. This standard is limited to die sets not exceeding die space dimensions of 630 by 400 millimeters. Plain and antifriction bearing components are included in this standard.