Rolling precision points (main) dimension accuracy and rotation accuracy. Accuracy has been standardized, divided into 0, 6X level, six, five, four, two six grade.

In turn improve the accuracy from 0 from 0 for general use is sufficient, but in the conditions shown in Table 1 for the occasion or need to level 5 or higher accuracy.

Although the above level of accuracy based on ISO standards benchmarking, but the title is different in each country standards.

Dimensional accuracy (with the installation of the shaft and housing-related projects)

1, Bearing diameter, diameter, width and the width of the assembly tolerance

2, Within the group allows the roller diameter complex and the outer diameter complex deviation

3, Chamfer dimensions allowable threshold

4, The width of the allowable amount of fluctuation

Bearing rotation accuracy (with the rotating body beating-related projects)

1, The inner ring and outer ring allows radial and axial runout

2, The inner ring allows lateral runout

3, The outer diameter surface of the allowable amount of fluctuation inclination

4, The thickness of the thrust bearing raceway allowable amount of change

5, Tapered bore tolerances and allowable amount of fluctuation