Advisor / ISO GPS reference / Parallelism
Orientation tolerance · ISO 1101
Parallelism
Limits how far a line or plane may tilt away from being parallel to a datum.
In the shop
Machine the datum face first and take the second face in the same setup where possible. A second clamping breaks the relationship.
General shop guidance in our own words. The drawing and the standard it cites decide; verify on a sample part.
Related orientation tolerances
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.