Limits and fits

In mechanical engineering, limits and fits are a set of rules regarding the dimensions and tolerances of mating machined parts. Limits and Fits are given to a part's dimensions to gain the desired type of fit. This is seen most commonly in regulating shaft sizes with hole sizes.

Limits and Fits are standardized by the International Organization for Standardization (ISO) and the American National Standards Institute (ANSI). Tables are used to quickly calculate required tolerances for bolt holes, shafts, mating parts, and many similar scenarios.

Units for limits and fits are typically specified in thousandths of an inch or hundredths of a millimeter.

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