TOTAL RUNOUT

RUNOUT

Controls all surface variation simultaneously relative to a datum axis

⚠ DATUM REQUIREDASME Y14.5-2018 §12.7

Total runout controls the combined variation of a surface across all cross-sections simultaneously as the part is rotated about a datum axis. It controls circularity, straightness, coaxiality, angularity, and taper all at once. It is more stringent than circular runout.

WHEN TO USE IT

Use total runout when the entire cylindrical surface must be controlled simultaneously — not just individual cross-sections. Common applications include precision spindles, crankshafts, camshafts, and any rotating component where overall surface quality relative to the rotation axis is critical.

COMMON MISTAKES

Omitting the datum axis reference — total runout always requires a datum

Using total runout when circular runout is sufficient — total runout is more restrictive and costly to achieve

Confusing total runout with cylindricity — cylindricity has no datum, total runout always does

Applying total runout to flat faces — for flat faces perpendicular to the axis, this is valid but must be intentional

IS YOUR CALLOUT CORRECT?

Check these before releasing your drawing.

Does the FCF include a datum axis reference?

Total runout always requires a datum axis.

Is the full surface — not just individual cross-sections — required to be controlled?

If individual cross-sections are sufficient, circular runout is less restrictive and easier to inspect.

Is the feature a surface of revolution relative to the datum axis?

Total runout applies to cylindrical surfaces or flat faces perpendicular to the datum axis.

RELATED SYMBOLS

OTHER RUNOUT CONTROLS

↗Circular Runout

Redprint checks total runout automatically

Redprint checks for missing datum references and verifies total runout is applied to appropriate features of revolution.

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