Runout controls how much a round feature may vary as it rotates around a datum axis. Use it for shafts, shoulders, bearing seats, pulleys, and other rotating features where circular variation relative to an axis affects fit, vibration, or sealing.

Runout GD&T annotation on a rotating feature relative to a datum axis

Faces Or Edges

Select a round face or circular edge that should be controlled during rotation about the datum axis.

Tolerance

Set the allowed circular runout in the current unit system.

Datums

Add the datum label or labels that define the rotation axis. Runout requires at least one datum reference.

Precision

Choose how many decimal places to display for the tolerance value.

Frame Position

Place the feature control frame near the selected round feature while keeping it clear of other annotations.

Frame Plane

Choose the display plane for the annotation. Use the plane that keeps the callout readable in the view where runout will be reviewed.

Leader Scale

Adjust the visual scale of the leader dot.

Font Size

Set the model-space height of the annotation text.

Are you interested in code?

Zoo Design Studio writes KCL behind the scenes. A Runout annotation uses gdt::runout with selected faces or edges, a tolerance, and datum references.

Want to find out more about the gdt::runout function? Check it out in our KCL docs.

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