Punch Press Force — Tonnage & Clearance
Calculate force and tonnage for punching holes in sheet metal. Force = Perimeter × Thickness × Shear Strength. Essential for press selection and tool design.
Why This Construction Metric Matters
Why: Undersized press damages tooling; oversized wastes capital. Clearance affects hole quality and tool life. Shear strength varies by material.
How: Perimeter from shape (πD round, 2(L+W) rect). Force = P × t × shear strength. Tonnage = Force / 2000 lbs. Clearance 3–8% of thickness.
- ●Mild steel ~45 ksi shear; stainless ~55–65 ksi.
- ●Clearance 3–8% of thickness; too tight = burrs.
- ●Add 1.5× safety factor for press selection.
- ●Stripping force ~10–20% of punch force.
Punch Force Calculator
Tonnage • Clearance • Press • Tool Sizing
Quick Examples — Click to Load
Round Hole in Steel
1" diameter hole in 0.125" mild steel
Square Hole Aluminum
2" square hole in 0.25" aluminum
Slot in Stainless
3" × 0.5" slot in 0.1875" stainless
Multiple Holes
10 × 0.5" holes in 0.1" steel
Heavy Gauge Punch
2" round hole in 1" thick steel
Precision Hole
0.25" round hole in 0.0625" titanium
Round Hole
Circular hole - most common shape
📏 Hole Dimensions
🔩 Material Properties
Mild Steel (A36)
Low carbon steel, most common
⚙️ Press & Safety
Planning estimates only. Verify with a licensed engineer or contractor before construction.
📐 Construction Industry Facts
Force = Perimeter × Thickness × Shear Strength.
— ASME
Tonnage = Force (lbs) / 2000.
— Industry
Clearance 3–8% of material thickness.
— Tool design
Use 1.5× safety factor for press selection.
— Best practice
What is a Punch Force Calculator?
Determines force required to punch holes in sheet metal. Essential for press tonnage selection, punch/die design, clearance calculation.
Press
Tonnage selection
Tool Sizing
Punch & die
Clearance
Die clearance
Safety
Safety factors
How to Calculate
When to Use
Sheet metal fabrication, stamping, fastener holes, design.
Why It Matters
Correct press tonnage, safe operation, proper tool sizing.
Where Applied
Metal fabrication, stamping, automotive, HVAC.
Formulas
P = πD (round) or 2(L+W) (rect). F = P × t × τ. Tonnage = F/2000.
Tips
- • Use 1.5× safety factor
- • Clearance 3–8% of thickness
Common Mistakes
- • Wrong shear strength for material
- • Forgetting to add safety factor
FAQs
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