The measure that the diameter decreased when going from blank to a cup. Also refers to the percentage decrease of a cross-sectional area, when discussing forging, extrusion, rolling or drawing. In general the term refers to a percentage decrease from an original shape to the re-shape.

A process that uses striking to improve alignment, surface condition, hardness and tolerances. Only used when parts are misaligned or forged incorrectly.

An operation in which a part is drawn in the opposite direction to which it was originally drawn.