We are often asked about the correct way to calculate the diagonal dimension of a punch. In this diagram, you will see several formulas for calculating the diagonal dimension for a square punch, rectangular punch and hexagonal punch. When punching these shapes, you will often need to know what the diagonal dimension is to ensure that the punch size will not be larger than the punch body allowing it to fit through the bore opening of your coupling nut.

For more information about calculating the correct diagonal dimension of a punch, and other related topics, click here to visit one of our many reference pages on our website.

American Punch AppWe have an app for that! Visit Google Play or the Apple Store and search “American Punch” to download our Tonnage Calculator. Our free app features four calculators for determining the information necessary for accurately and safely punching holes in a variety of materials typically found in the structural steel and fabrication industries. Designed with the ironworker, machine operator, estimator or engineer in mind, these calculators offer a way to determine the required tonnage for punching mild steel and the proper die clearance. It also has a calculator for determining the correct diagonal measurement for square, rectangular and hex shapes. Even includes a measurement conversion calculator. All in one, easy-to-use app!