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Slewing bearings (fig 1) are ball or cylindrical roller bearings which can accommodate axial, radial and moment loads acting either singly or in combination and in any direction. They are not mounted on a shaft and in a housing; the rings, which are simply bolted on the seat surface are available in one of three executions-without gears
-with an internal gear
-with an external gear.


Slewing bearings can perform both oscillating (slewing) movements as well as rotating movements.