Import bearings rolling the precision of the points (main) size accuracy and rotation precision. Precision grade already standardization, divided into class 0, 6 X, 6 class, level 5, 4 level, level 2 six level.

Precision from 0 level up in turn increase, for general purpose 0 level has enough, but used in table 1 shows condition or situation, need 5 level or higher precision.

The precision of the above level based on ISO stand

ard though set, but the call in the national standards in different.

Size accuracy (and shaft and shell installation related projects)

1, diameter, outer diameter, width and assembly of the width of the allowable deviation

2, the roller in the group and the diameter months-moons months-moons diameter deviation

3, FAG bearing down the size of the Angle limit value allowed

4, width of the amount allowed changes

Rotation precision (and beat the area related projects)

1, inner ring and outer ring the permission of the axial and radial beat

2, the permission of the inner circle transverse pumping

3, outer diameter gradient allows variations under surface

4, NSK bearing thrust the thickness of the groove is allowed to change
5, tapered hole deviation and allow the quantity change



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