JOJI double-direction thrust angular contact ball bearings are designed for bidirectional axial positioning of the spindle. These bearings are combined with NN 30 K or N 10 K series cylindrical roller bearings and installed in the same bearing seat hole. This bearing combination can simplify the processing of the bearing seat hole.

The nominal inner diameter and outer diameter of the double-direction thrust angular contact ball bearings are the same as those of the corresponding cylindrical roller bearings. However, the outer diameter tolerance of the seat ring is combined with the recommended bearing seat bore diameter and form and position tolerance (bearing seat tolerance under standard conditions) of the super-precision cylindrical roller bearing to provide an appropriate radial clearance in the bearing seat hole. If the outer ring is not axially pressed in the bearing seat, the clearance is sufficient to prevent the thrust bearing from being subjected to radial loads.