![]() ![]() ![]() The difference between the radii of these two circles defines the permissible tolerance limit for the feature. The circle’s measurements must lie within the blue zone The tolerance zone consists of two concentric circles that lie on a plane that is perpendicular to the central axis of the part feature. The circularity callout defines a two-dimensional tolerance zone for the actual part surface. The aim is to set a limit to the desired accuracy of the circular feature in relation to a perfect circle. Also known as roundness, it control’s a feature’s circular nature such as the diameter of a cylindrical pin or a hole. The geometrical tolerance of circularity is one of the four types of form control, the others being straightness, flatness and cylindricity. VII Points to Remember What is Circularity? ![]()
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