Concentricity is a very complex feature because it relies on measurements from derived median points as opposed to a surface or feature’s axis.Ĭoncentricity is a 3-Dimensional cylindrical tolerance zone that is defined by a datum axis where all the derived median points of a referenced cylindrical feature must fall within. * In the ISO Standards, MMC is allowed with concentricity and symmetry Drawing Callout:Ĭoncentricity, (called coaxiality in the ISO Standard), is a tolerance that controls the central derived median points of the referenced feature, to a datum axis. Relative to Datum: Yes MMC or LMC applicable: No* Learn more about changes to the 2018 ASME Y14.5 standard.
It is still commonly in use for those on previous versions of the standard. Note: Concentricity was removed from the 2018 ASME Y14.5 standard.
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