Slewing ring bearing (slewving bearing), is a  bearing  that able to bear a  large axial load, radial load and overturning torque. slewving bearings are generally accompanied with installing hole inner gear ,outside gear, lubricants hole and sealing devices, which enable mainframe structural compact, guide reliable, and easy to maintain.Slewing bearings are combination structure include non- gear,outside gear, and four point comtact ball bearings, double row angular contact ball bearings, cross-cylindrical roller bearings, cross-Tapered Roller bearings and three rows cylindrical roller bearings and so on. In which, four point contact ball bearings have higher static load capacity; while cross-cylindrical roller bearings have higher dynamic load capacity; Cross-Tapered Roller Bearings through  PWC can support larger and higher rotation accuracy.
Slewing bearings widely used in lifting machinery,excavate machinery, construction machinery, port machinery, ships machinery, as well as precision radar missile launchers and large rotary device such as  missile launcher