The clearance standards of ceramic bearings are the same as those of ordinary bearings, which are mainly divided into radial clearance and axial clearance. Radial clearance refers to the amount of movement of the other ring from one extreme position to the other extreme position relative to the fixed ring in the radial direction when one ring is fixed without load. Axial clearance refers to the amount of axial movement of one ring from one extreme position to another relative to the fixed ring when there is no load and one ring is fixed. The clearance standard of ceramic bearings is the same as that of ordinary bearings. The selection of clearance mainly considers the following aspects:

1. Influence of fit: The fit between the inner ring of the bearing and the shaft, and the fit between the outer ring and the housing hole will affect the size of the clearance. An interference fit will reduce the clearance, while a clearance fit will increase the clearance.

2. Influence of temperature: Bearings generate heat during operation, causing the internal temperature to rise, which in turn causes the shaft, bearing seat and bearing parts to expand, which also affects the size of the clearance.

3. Influence of load: When the bearing is under load, it will produce elastic deformation, thus affecting the size of the clearance. The specific clearance standard can be determined by referring to the relevant national standards or technical data provided by the manufacturer.

For example, C0 represents the standard clearance, while C2, C3, C4, C5, etc. represent clearance grades that are slightly smaller or larger than the standard clearance.