Metalforming Tips Blog

Designing an Economical Blank for Precision Metal Stamping

close-up of car hinge and stamping parts

When designing metal blanks for precision metal stamping, there are a few guidelines to follow for the most economical results. Below, you’ll find some of these guidelines. These are tried-and-true best practices we’ve discovered in our over 90 years of metal stamping.

Guidelines for Blank Design

diagram of a stamped part

Minimum Practical Section Thickness

Minimum practical section should never be less than material thickness or .060. A minimum section must be one and one half times material thickness for high shear strength material for the most practical stamping.

Blank Corner Radii

Corners can be sharp if material thickness is 1/16 or less — over 1/16 allow corner radii (R) equal to 1/2 material thickness. See illustration above.

Practical Design for Economy Manufacture

Follow these guidelines for maximum economy:

W = .060 minimum for materials thinner than .060 wider if possible.

W1 = Never less than material thickness, wider if possible.

L = 5 x W is maximum depth, should be less if possible.

L1 = 5 x W is maximum length, should be less if possible.

If followed, all blank periphery can be included in the blanking die, eliminating secondary tooling and operations.

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