Symmetry

Limits how far a feature may be off-center relative to a datum center plane.

In the shop

Machine both sides from the same datum in one setup, and measure from the centre plane rather than from each face.

General shop guidance in our own words. The drawing and the standard it cites decide; verify on a sample part.

Related location tolerances

Coaxiality · Concentricity · Position

Ask about your drawing

Tell the advisor the feature, the tolerance on the drawing and the material. It answers with machining choices, brand-neutral.

Sources

Definition written in our own words and checked against keyence.com. Symbol and term names follow ISO 1101; we do not reproduce standard text. See the full index.