The only way to check circular or total runout is to hold the part between centers positioned precisely on each end of the datum axis on each end of the part.

Circular Runout

A tolerance that limits the total variation a surface can have when rotated around a central axis, ensuring roundness and smooth operation of rotating parts.

Total Runout

A composite tolerance applied to a feature which controls both its form and its orientation to a datum axis.

Datum Axis

An imaginary line or surface referenced in manufacturing or inspection of parts and assemblies to ensure coordination and correctness of dimension and tolerance specifications.