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Correct fit ensures the ring with rotating load has an interference fit to prevent creep (ring rotation on the seat), while the non-rotating ring has a looser fit for easy mounting and to allow axial float if needed.

The most common case: the shaft rotates and the housing is stationary. The inner ring needs a tight fit on the shaft, and the outer ring gets a sliding or transition fit in the housing.

For rotating inner ring with normal loads: k5 for ball bearings, m5 for roller bearings. For heavy/shock loads, use m6 or n6. For light loads, j5 is sufficient.

A transition fit (j5, k5) may result in either slight clearance or slight interference. An interference fit (m5, n6, p6) always gives the shaft larger than the bore, requiring force or heating for assembly.

Use a loose housing fit (H7, G7) when the outer ring must be free to move axially (non-locating position), when the housing is split, or when the outer ring load is stationary.