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The Process

Impact Extrusion:

"A part formed in a confining die from a metal slug, usually cold, by single stroke application of force through a punch causing the metal to flow around the punch and/or through an opening in the punch or die."

Aluminum Impacts Design Manual and Application Guide
Aluminum Association, 1988

Reverse Impacting

A blank of material (slug) is placed in a die cavity and struck by the punch forcing the material to flow outward back over the punch.

Forward Impacting

The "slug" or metal, flows through the orifice of a die by the forward force of the punch.

Combination Impacting

This process involves both reverse and forward impacting in one operation.

Standard Commercial Tolerances
Outside Diameter (inches)	O.D.	I.D.	Bottom Thickness	Outside Length
1	+/- .005	+/- .006	+/- .010	+/- .015
2	+/- .005	+/- .006	+/- .010	+/- .015
3	+/- .007	+/- .007	+/- .012	+/- .015
4	+/- .010	+/- .010	+/- .015	+/- .020
5	+/- .012	+/- .013	+/- .018	+/- .020
6	+/- .015	+/- .015	+/- .018	+/- .020
Other tolerances available upon request