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When in Doubt - Use Runout
(In accordance with Y14.5M-1994 standard)

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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.

Back to Tips Tip added Jun 1997