Die Spring
A heavy-duty rectangular-wire spring color-coded by load class, used to power strippers and pads.
What it means on the floor
Die springs are compact, high-force compression springs wound from rectangular wire. They are color-coded under ISO 10243 by duty (light, medium, heavy, extra-heavy), which sets their load for a given size and deflection.
They power stripper plates, pressure pads, and pilots. Selecting the right spring balances required force against allowable deflection and fatigue life.
Category: Tooling
Applying the term
Interpret Die Spring in the context of the drawing, governing standard, and customer requirement in front of you — the same word can carry different limits in design, quality, and production documents. Check whether a stated value is nominal, minimum, maximum, or reference-only, and whether it applies before forming, after forming, or after heat treatment.