The system of limits and fits is useful for determining tolerances of components that need to have a relationship or function with one another. For example, clearances fits ranging from loose to precision sliding fits. They are also useful for determining how much interference is required to lock or position two parts together.
While mostly useful for circular features. The system also applies to orthogonal or linear features such as slots and keys.
The system uses letters and numbers. The letters indicate the clearance while the number specifics the precision or tolerance. A capital letter refers to the hole size and lower-case letter refers to the shaft size.
Keys and keyways are used to transfer torque from shafts to holes or vise versa. As a general rule, the key is a tighter fit to the shaft so that the key remains on the shaft during assembly and removal.
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