Class of Fit

It is important that mechanical parts with tolerances that allow for certain types of operation of the two parts. There are a number of systems that classify the dimensional tolerances between parts for different applications.

Clearance Fit

A fit that always enables clearance between the hole and shaft of a coupling.

Transition Fit

A fit between a hole and a shaft where both clearance and interference may occur in the coupling.

Interference Fit

A fit between a hole and a shaft where there is always some interference between the two.

See also: Allowance, Clearance Fit, Interference Fit, Tolerance, Transition Fit.

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Subjects: Mechanical Engineering

Tolerance and Fit - Selection of suitable fits of machine parts according to the international standard ISO 286, ANSI B4.1 and ISO 2768.