Translations:TechDraw Geometric dimensioning and tolerancing/72/en
Type of control | Geometric characteristics | Symbol | Unicode character | Datum necessary | Notes |
---|---|---|---|---|---|
Form | Straightness | ||||
Form | Flatness | ||||
Form | Roundness | In older norms also called circularity. | |||
Form | Cylindricity | ||||
Form / Orientation / Location | Line profile | No datum necessary when used for form purpose | |||
Form / Orientation / Location | Surface profile | No datum necessary when used for form purpose | |||
Orientation | Parallelism | ||||
Orientation | Perpendicularity | ||||
Orientation | Angularity | ||||
Location | Position | No datum necessary when working with norm ISO 5458. | |||
Location | Concentricity / Coaxiality | Named concentricity when used for center points and coaxiality when used for median lines. In the norm ASME Y14.5 it was eliminated since the version from 2018. | |||
Location | Symmetry | In the norm ASME Y14.5 from 2018, the symmetry was eliminated. | |||
Run-out | Circular run-out | ||||
Run-out | Total run-out |