Punching Tonnage Calculator

Tonnage for Round Punches

The following form will help you calculate how much tonnage is needed to punch round holes through a given thickness of metal. There are some limitations that you should be aware of. If you do not need a flat slug you can lower the tonnage required by adding a shear cut to the punch. Maxium amount of shear will cut tonnage in half as long as you have enough stroke movement on the punch. All input into the form below should be placed in decimal equivalants. Following are thickness tolerances on galvanized steel. Note: for holes 5/16" or less, the material thickness can not exceed the diameter of the hole being punch.


Diameter of Hole:   
Inches (decimel equivalent)

Material Thickness:  

Inches (decimel equivalent)
Tonnage Required: