The accuracy of bearings, in terms of both spatial and temporal dimensions, is divided into two types dimensional accuracy and rotational accuracy. In terms of spatial structure, there is inherent dimensional accuracy of the bearing. In time movement, accuracy during rotation is often more critical.

Dimensional accuracy (items related to the shaft and housing installation)
Allowable deviation of inner diameter, outer diameter, width, and assembly width
Permissible deviation of inner compound diameter and outer compound diameter of roller group
The permissible limit value of chamfer size
Permissible variation of width

Rotational accuracy (items related to the runout of the rotating body)
Permissible radial runout and axial runout of the inner and outer rings
Allowable lateral runout of the inner ring
The allowable variation of the outer diameter surface tilt
Allowable variation of the thickness of the thrust-bearing raceway
Allowable deviation and allowable variation of the tapered hole