The main shaft bearing is a single row angular contact ball bearing, which includes solid inner and outer rings, solid window holders, and ball components. The main shaft bearing cannot be disassembled. Bearings have open and sealed designs.

The tolerance of shaft bearings is limited. It is particularly suitable for bearing arrangements that require extremely high guidance accuracy and high-speed applicability. It has been proven that it has become an ideal choice for the arrangement of spindle bearings in machine tools.