Part 1 utilizes four tolerance classes for varying levels of precision: : Highest precision. m (medium) : Standard workshop accuracy. c (coarse) : For less critical features. v (very coarse) : Lowest precision level. Permissible Deviations (ISO 2768-1)
| Length of Shorter Leg (mm) | Class f | Class m | Class c | Class v | | :--- | :--- | :--- | :--- | :--- | | | $\pm 1^\circ$ | $\pm 1^\circ$ | $\pm 1^\circ 30'$ | $\pm 3^\circ$ | | Over 10 up to 50 | $\pm 0^\circ 30'$ | $\pm 0^\circ 30'$ | $\pm 1^\circ$ | $\pm 2^\circ$ | | Over 50 up to 120 | $\pm 0^\circ 20'$ | $\pm 0^\circ 20'$ | $\pm 0^\circ 30'$ | $\pm 1^\circ$ | | Over 120 up to 400 | $\pm 0^\circ 10'$ | $\pm 0^\circ 10'$ | $\pm 0^\circ 20'$ | $\pm 0^\circ 30'$ | iso 2768 pdf
The tolerance value depends on the and the tolerance class . Part 1 utilizes four tolerance classes for varying
The standard is divided into two distinct parts that control different aspects of a part's geometry: v (very coarse) : Lowest precision level