Characteristic of structure, performance and application The single row four point contact ball slewing bearing is composed of two seat rings, which design in compact structure and light weight, steel ball contact with the circular raceway at four point, it can bear the axial force, radial force and the tilting moment at the same time. It can be used for slewing conveyer, welding manipulator, light & medium duty crane, excavator, and other construction can be change according to the user's application. 2. n-cpcan change to tapped hole,the diameter of tapped hole 3. The tangential tooth force in the form is the max tooth force,the nominal tangential tooth force is 1/2 of the max 4. "K" is addendum reduction coefficient.