CIRCULARITY

GD&T Symbol:                   

Relative to Datum:                          NO

MMC or LMC applicable:    NO

Circularity is Form type Tolerance.

Circularity tells about how close an part should be to the true circle.

It’s 2D Tolerance.

It is independent of datum.

Circularity controls the cross section of cylindrical part.

Drawing Callout:

Feature control frame with Circularity symbol can be indicated by leader arrow pointing to the surface.

Feature control frame does not contain datum box.

Tolerance Zone:

Entire referenced surface must lie between two concentric circles.