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Die Clearance

Die Clearances have a major effect on the stamping process and are expressed as a percentage of the work piece thickness.

Die Clearances within this presentation will be expressed in terms of total die clearances and will have to be divided by two if die clearances per side are required.

Die Clearance Guidelines

Note: For hole sizes less than 1.5 T, Die Clearances should be increased.

Material Properties

General

Shear Strength

PSI (kg/cm2)

Material Examples

General

Solid Punches Ejector Punches
Die % Clearance (Total) Burnish

(% T)

Die % Clearance (Total) Burnish

(% T)

Soft 5,000 (350) to 20,000 (1410) Aluminum 8 – 14% 50-70 15 – 18% 30-50
Mild 20,000 (1410) to 50,000 (3520) Cold Rolled Steel 8 – 14% 40-60 18 – 24% 20-40
Tough 50,000 (3520) to 80,000 (5620 Stainless Steel 8 – 14% 30-50 24 – 30% 10-30
Hard 80,000 (5620) to 140,000 (9840) Tempered Steel 8 – 14% 10-30 30 – 40% 5-20

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