# Fit

A juncture of two parts where there are closely fitting machined surfaces; or the degree of contact between two mating surfaces such as a bearing bore and a shaft. Different applications require different fits. A slip fit is one in which there is a small amount of clearance between the two mating parts allowing them to slide together quite easily. An interference fit is one in which the actual sizes of the two mating parts overlap, requiring a certain amount of pressure to assemble. (Example: A shaft with a 7.994-mm diameter and a bearing with a 7.992-mm bore.)

*See also Grease Fitting; Press Fit (Macinery); Press Fit (Mechanical Seal); Rabbet Fit; Register Fit; Shrink Fit; Sliding Fit; Spline Fit; Zerk Fitting.*