This standard describes the system of limits and fits for non-threaded mating. It establishes symbology, preferred basic sizes and tolerances, and preferred limits and fits.

This standard defines terms applying to fits between plain (non-threaded) cylindrical parts and recommends preferred sizes, allowances, tolerances, and fits for use wherever they are applicable.

This standard shows how to specify tolerances for metric dimensions without a designation. The fine and medium series are mostly for machined parts, and the coarse series for all types of dimensions.