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Circularity roundness in GD&T

The circularity symbol is also called roundness some time. This symbol is used to describe the required roundness of an object.

Roundness is a condition of a surface or revolution where:-

1. For a cylinder or cone, all points of the surface intersected by any plane perpendicular to a common axis are equidistant from that axis.

2. For a sphere, all points of the surface intersected by a plane passing through a common center are equidistant from the center.

The following example showing the circularity specification of 0.2 is called out from the control box, it can be simply measure the roundness of the object, Allowable tolerance is 0.2

circularity in GD&T

 

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