Straightness

Limits how far a line or axis may bow away from a perfectly straight line.

In the shop

On long, slender parts straightness is mostly a deflection and clamping problem. Support the part (steady rest or tailstock), keep the length-to-diameter ratio in check and take the finishing cut light.

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

Related form tolerances

Circularity · Cylindricity · Flatness

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.