Difference between Cylindercity & concentricity? GD & T Engineering Drawing Instruments

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Cylindricity measures how close the entire surface of a cylinder is to a true cylinder, while concentricity measures how close the center points of two circles or cylinders are to being perfectly aligned.

Cylindricity is a 3D form control that ensures the entire surface of a cylinder is within a specified tolerance zone.
Concentricity is a 2D form control that ensures the center points of two circles or cylinders are aligned within a specified tolerance zone.
Cylindricity is used to control the roundness and straightness of a cylinder, while concentricity is used to control the alignment of two circular features.
In GD&T, cylindricity is represented by a cylindrical tolerance zone around the true cylinder, while concentricity is represented by a circular tolerance zone around the center points of two features.

Difference between Cylindercity & concentricity? GD & T Engineering Drawing Instruments

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Difference between Cylindercity & concentricity? GD & T Engineering Drawing Instruments