General Tolerances: Runout

Runout is included among the general tolerances specified in ISO 2768-2:1989. It indicates how much a rotating or circular component may deviate from perfect rotational motion when no separate tolerance is specified.

General tolerances limit the permissible deviation of features such as a hole centerline, shaft, or cylindrical surface, ensuring that the component functions as intended without unnecessarily strict manufacturing requirements. This is especially important for moving parts, where excessive runout could cause vibration, wear, or imbalance.

Runout does not need to be specified separately on a drawing when general tolerances are used. It is sufficient for the drawing to include a designation such as ISO 2768-mK, in which case the limits specified by the standard also apply to runout.

General Tolerance Table: Runout

Tolerance class	Runout tolerances
H	0.1
K	0.2
L	0.5

The values in the table are given in millimeters (mm).