The choice of tolerance level
and bearing with the shaft or bearing bore tolerance level and bearing accuracy. P0-level precision bearings with shaft tolerance class generally IT6 bearing hole is generally IT7 and. Rotation accuracy and smooth operation with higher requirements for the occasion(such as electric motors), should be selected axis is IT5 bearing hole for IT6.

The choice of the tolerance zone
The equivalent radial load P is divided into several cases of the "light" and "normal" and” heavy" load, rated with the bearing dynamic load rating C relationship:
≤ 0.12C heavy load, light load P ≤ 0.06C normal load 0.06C <0.12C <P
1) shaft tolerance zone
Shaft tolerances to install the bearings and angular contact bearings with reference to the corresponding tolerance zone table. Most cases, the axis and radial loads in the same direction, that is the occasion of the bearing inner ring relative to the load direction of rotation, generally should be selected transition or interference fit. Stationary axis and radial load the same direction, the bearing inner ring is stationary relative to the load direction occasions, the choice of transition, or a small clearance fit (too big the gap is not allowed).
2) the shell hole tolerance zone
The tolerance of the shell hole to install the bearings and angular contact bearings with reference to the corresponding tolerance zone table. Note

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