Minimum Flange Length Chart
Minimum flange length depends on die opening, inside radius, material thickness and bend angle. Use the bend-deduction workflow before committing flat patterns.
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Why flange minimum matters
A short flange can fall into the die or miss the needed contact points, even if the flat length math is correct.
Flat length still uses bend deduction
flat length = sum outside flanges - sum bend deductions
Workflow
- Screen flange length against tooling.
- Calculate bend deduction.
- Check tonnage and V-die choice.
- Confirm with shop setup or sample bend.
Related pages
- Bend allowance calculator - neutral-axis arc length and flat-pattern inputs.
- Bend deduction calculator - flat length from outside mold-line dimensions.
- Box flat pattern calculator - tray blank size, bend lines and relief screen.
- Press brake tonnage calculator - forming force and V-die checks.