Slewing bearings (also known as rotary bearings) are large bearings capable of simultaneously withstanding axial force, radial force, and overturning moment. Often referred to as the "joints of machines," they have an extremely wide range of applications, primarily in construction machinery, lifting and transportation equipment, new energy equipment, medical equipment, shipbuilding and port machinery, and light industrial machinery, and are gradually expanding into high-end fields such as robotics and aerospace equipment.

Single-row four-point contact ball slewing bearings consist of two raceways, featuring a compact structure and light weight. The steel balls make four-point contact with the arc-shaped raceway, enabling them to simultaneously withstand axial force, radial force, and overturning moment. They are suitable for use in rotary conveyors, welding manipulators, small and medium-sized cranes, excavators, and other construction machinery.