Circularity tolerance must always be less than the size tolerance except for parts subject to free state variations.

Question

Quizplus · Accepted Answer

Circularity tolerance is a measure of how perfectly circular a feature or part is, whereas size tolerance is a measure of the allowable variation in size from the nominal or target size. Since circularity is a dimension related to the shape of the part, it makes sense that the circularity tolerance is always smaller than the size tolerance so that the part is not oversized or undersized due to its non-circular shape. However, in parts subject to free-state variations, where a part may change shape or size due to external factors, it may be acceptable for circularity tolerance to be equal to or greater than the size tolerance.

Circularity Tolerance Must Always Be Less Than the Size Tolerance