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Fit (manufacturing) : ウィキペディア英語版 | Fit (manufacturing)
In precision mechanics, fit refers to the degree of 'looseness' with which an shaft is inserted into an orifice. This coupling is related to the tolerance or allowance of both parts dimensions. The shaft and the orifice must be of a similar diameter, otherwise there will not be a correct adjustment. With this in mind, measurements have been internationally standarised according to ISO regulation to ensure the interchangeability of items and their mass production. Tolerance values are designated with a capital letter in the case of orificies and lower case letters in the case of shafts. The lower the value the higher the machining costs, as a greater precision is required.
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