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Two circles sharing a centre in a tolerance frame.
Also known as: Coaxiality symbol
Concentricity controls the median points of a feature relative to a datum axis. It is notoriously difficult to inspect, and the 2018 revision of ASME Y14.5 removed it altogether in favour of position or runout.
Limits the deviation of a feature's median points from a datum axis.
Contexts: Technical drawing
Was removed from ASME Y14.5 in its 2018 revision because it is very difficult to verify, with position or runout recommended instead; it remains in ISO practice and on legacy drawings.
Contexts: Technical drawing
Two circles of different size sharing one centre, drawn in a rectangular frame.