refmanualEngineering, within reach.

Geometric requirements

Circular runout versus total runout

Circular runout addresses individual circular sections during rotation about the specified datum axis. Total runout addresses the designated surface over its required extent.

Sources and scope ↓

Define the setup

Identify the datum axis, controlled surface, probe direction and sampling coverage. A single indicator trace at one section does not establish total-runout compliance of an entire surface.

Do not decompose a reading into unrelated controls

The measured variation reflects the geometry and setup together. It cannot be reported as separate roundness, perpendicularity and concentricity errors merely by renaming the same number.

Do not rewrite an older callout

Older concentricity requirements are not automatically equivalent to runout. Resolve any change through the controlled drawing and governing edition.

Continue your task

Separate the datum feature, simulator and datum →Find the geometric control on your drawing →Plan a Gauge R&R study around the measurement task →

All tolerance and surface references →

Sources and review scope

Reviewed 23 October 2026. Arithmetic examples are labelled separately from source-table facts and standard scope.

KEYENCE — Run-out tolerance

Circular versus total runout, rotation about a datum axis and sampling coverage.

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Mitutoyo — Changes in ASME Y14.5-2018

PDF pp. 4, 12–16: removal of concentricity/symmetry from ASME 2018 and comparison with earlier editions. Manufacturer teaching, not the standard text.

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