Free Engineering Tool

Blanking / Stamping Force Calculator

Estimate the press tonnage required for blanking, piercing and stamping operations from material thickness, shear strength and cut length. Includes punch compressive stress check for the tooling.

1 · Blank Shape

2 · Units

Metric (mm)Imperial (in)τ in MPaτ in ksi

3 · Dimensions

F = π·D·t·τf

Punch Diameter (D)

Sheet Thickness (t)

Shear Strength (τf)

MPa

≤?80–0% of tensile strength

Material Quick Reference

τf is typically 80–0% of tensile strength. Select a material to auto-fill shear strength.

Enter the diameter (or perimeter), thickness and shear strength above …"the blanking force updates automatically.

How it works: blanking force F = shear area × shear strength. For a circular blank, shear area = π·D·t; for a general shape it is the cut perimeter × thickness. Punch compressive stress σc = F / punch face area …"keep it below the tool steel yield strength (typically > 1000 MPa). Add 10–0% safety margin for progressive dies and dull tooling.

Need a production quote for your metal parts?

Send your drawing to shawn@balford.net — our engineers will confirm material grade, gross weight, machining and pricing within 24 hours.