Tightness of Fit
The tightness of fit is controlled by amount of interference; the "allowance". Formulas exist to compute this allowance (planned difference from nominal size) that will result in various strengths of fit such as loose fit, light interference fit, and interference fit. The value of the allowance depends on which material is being used, how big the parts are, and what degree of tightness is desired. Such values have already been worked out in the past for many standard applications, and they are available to engineers in the form of tables, obviating the need for re-derivation. Thus if a loose fit is desired for a 10 mm (0.394 in) shaft made of 303 stainless steel, the engineer can look up the needed allowance in a reference book or computer program, rather than using a formula to calculate it.
Read more about this topic: Interference Fit
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