Punching capacities calculator (diameter)


POT. = (p x e x sT)/1000 TONNAGE = perimeter x thickness x strength Kgs. = mm. x mm. kg/mm2 Kgs. / 1000 = Tns. Please refer to the below drawing for more information about how to calculate the perimeter (p) of the most common shapes.


CAUTION: Never punch a diameter smaller than the material thickness

Select a shape and enter measurements:

Fill in two of the three first fields and get the result for the missing field.
Resistance is a compulsory field.
Example: for a given diameter, thickness and strength*, work out the tonnage.

Usual material strengths:

Low carbon steel38 kg./mm2
Mild steel45 kg./mm2
Stainless steel85 kg./mm2
Copper22 kg./mm2

Nevertheless, it is very important to apply the correct gap between punch and die:

Aluminum5 %
Copper7 %
Mild steel (ST37 to 42)10 %
Mild steel ST5212 %
Stainless steel15 %
% material thickness = gap
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