To meet the specific needs of different users, manufacturers typically provide different bearing accuracy levels. To standardize bearing accuracy grades, bearings are generally classified based on dimensional accuracy and rotational accuracy.

Dimensional Accuracy (items related to shaft and housing installation)

1. Permissible deviations of the inner diameter, outer diameter, width, and assembly width

2. Permissible deviations of the inner and outer diameters of the roller assembly

3. Permissible limits for chamfer dimensions

4. Permissible variation in width

Rotational Accuracy (items related to the runout of rotating bodies)

1. Permissible radial and axial runout of the inner and outer rings

2. Permissible lateral runout of the inner ring

3. Permissible variation in the inclination of the outer diameter

4. Permissible variation in the thickness of the thrust bearing raceway

5. Permissible deviation and variation of the tapered bore