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Concentricity is the condition where the axis of all cross-sectional elements of a surface of revolution are common to the axis of a datum feature. A concentricity tolerance specifies a cylindrical tolerance zone centered about the datum axis within which the axis of the controlled feature can be specified only on the RFS basic. Concentricity can also control variations in the parallel orientation of the controlled axis relative to the datum axis and the straightness of the controlled axis.


As long as the concentricity deviation is equal to or less than the specified concentricity tolerance, the part conforms to the specification at the measured cross-section. The part,of course, would have to be checked at all cross-sections in addition to being rotated about the datum axis to determine if it acceptable.



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