Punch Press
Tonnage Calculation
The punching tonnage is calculated by using the following formula:
Length of the cut edge (mm) x Material Thickness (mm) x Tensile Strength (kg/mm 2 ) 1000
Example 1 Rectangle 50 x 10 in 2.0 mm Stainless Steel
Tonnage Required = (50 + 50 + 10 + 10) x (2.0) x (60) 1000
Tonnage Required = 14.4 Tonnes
Example 2 30mm Diameter in 1.5 mm Mild Steel Tonnage Required = (3.142 x 30) x (1.5) x (40) 1000
Tonnage Required = 5.7 Tonnes
Minimum Hole Diameter
As a general guideline, the following table shows the minimum diameter (mm) of a punched hole with regards to material thickness.
t = Material Thickness
Material Type
Minimum Hole Diameter
Mild Steel Aluminium
1.0 x t 1.0 x t 2.0 x t
Stainless Steel
It is possible to punch smaller hits, please contact Tooling Hotline for assistance.
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