Fillet (noun)

Meaning A rounded transition between two intersecting surfaces.

Think of… A rounded corner — a smooth transition replacing a sharp inside edge.

Etymology From Old French filet, meaning a narrow band or rounded strip.

DFM Meaning Sharp corners are replaced with fillets to improve manufacturability and reduce stress concentration.

Singular - Add a fillet to this corner.

Plural - Increase the fillets around the mounting features.

Industry Example - A 2 mm fillet was added to improve plastic flow and reduce cracking.

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Part of the Glossary reference.