Four-point contact ball bearings are radial single row angular contact ball bearings with raceways that are designed to support two-directional axial loading.

Cross-roller type slewing bearings, their rollers are arranged at 90° to each other at intervals between the inner ring and the outer ring. They can simultaneously bear loads from all directions (such as axial, radial, overturning moment, etc.)

three-row cylindrical roller combined slewing bearing is mainly composed of an inner ring, an outer ring, three rows of rollers (two sets of axial and one set of radial rollers), a cage (spacer block), and has the characteristics of high load carrying capacity and good rigidity.