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Capacities based on 50,000 psi mild steel with no shear on punches and dies.
To obtain tonnage required for punching round holes in mild steel --- multiply as follows:
Diameter of Hole X 3.14 X Material Thickness X 25 =
Punching Pressure Require for One Hole
To obtain tonnage required for Rectangular holes in mild steel - Multiply:
Perimeter X Material Thickness X 25