The free app, Fit Tolerance ISO, has been designed for use as a reference in the development of engineering tolerances for various kinds of bearings, such as ball bearings, roller bearings, linear bearings, and more. The app is based on ISO standards and has been developed to calculate the size of components and the tolerance between them, as well as the size of the holes in the components.

It is based on ANSI standards and works in accordance with ISO standards. It is designed to be used by engineers and designers in their daily work. It is also useful for anyone who needs to know the size of a component and the tolerance between them.