When producing components or products in quantity it is essential that a balance should be struck between the highest attainable accuracy and the cost of production. There is no particular merit in making components to a closer dimensional tolerance than is demanded by the functional requirements during the expected life of the part. The selection of the most appropriate tolerance usually depends on the experience of the designer, although he can obtain assistance from standards such as BS 1916:1953 which lists suitable tolerances for mating cylindrical parts over a wide range of sizes and applications.
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