| When in
Doubt - Use Runout!
Avoid specifying concentricity.
Concentricity requires deriving the median line of a feature.
All of the features shown below are concentric. Usually,
designs require that a feature be round as well as concentric
like example A. A better geometric control is usually circular
runout. Circular runout controls circularity (roundness) as
well as concentricity.
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