Undercut (noun)

Meaning A feature that prevents a part from being removed in a straight line from the mold.

Think of… A fishhook — a feature that catches and traps the part in the mould.

Etymology Literally a feature cut "under" another surface, creating an overhang.

DFM Meaning Often requires slides, lifters, or side actions in the mold.

Singular - This clip creates an undercut.

Plural - Eliminate unnecessary undercuts to reduce tooling cost.

Industry Example - The snap-fit introduces two undercuts that require side actions.

---

Part of the Glossary reference.