General Tolerances for Circular Run-out
Runout is included in the general tolerances of ISO 2768-2:1989. It specifies how much a rotating or circular part can deviate from a perfect rotational movement when no separate tolerance is given.
General tolerances, for example, define the maximum allowed deviation of a hole’s centerline, a shaft, or a round surface so that the part functions as intended without requiring unnecessarily precise manufacturing. This is especially important for moving parts, where excessive runout could cause vibration, wear, or imbalance.
On drawings, runout is not marked separately when general tolerances are applied. It is sufficient to include a note such as ISO 2768-mK on the drawing, in which case the limits specified by the standard also apply to runout.
General Tolerance Table for Runout
| Tolerance Class | Runout Tolerance |
| H | 0.1 |
| K | 0.2 |
| L | 0.5 |
The values in the table are given in millimeters (mm)
