This on-line calculator gives you the number of tons required to punch
round, oblong, square and rectangular shaped holes through mild steel
having tensile strength of 65,000 pounds per square inch. All tonnage
requirements are based on sharp punches. Dull or chipped punches will
increase the tonnage requirements.
Enter data into for the shape desired and then click on the "Calculate
Tonnage" button to view results in the "Tonnage Required"
field. This calculator will only accept fractional numbers in decimal
format only. For numbers less than 1 inch there must be a zero before
the decimal. If you are looking for another metal type other than Mild
Steel use the drop down menu labeled "Select a Metal Type".
The tonnage will be filled in automatically.