The ISO 286 Standard uses an alphanumeric code (e.g., ) to define fits.
: The shaft is always larger than the hole, requiring force or thermal expansion/contraction for assembly. Fit Tolerance
In engineering, describes the relationship between two mating parts (typically a "hole" and a "shaft") and determines how tightly or loosely they fit together. This relationship is governed by tolerances , which are the allowable variations in dimensions to account for manufacturing imperfections. 1. The Three Main Types of Fits The ISO 286 Standard uses an alphanumeric code (e