A turret bearing or slewing ring bearing is a rotational rolling-element bearing or plain bearing that typically supports a heavy but slow-turning or slow-oscillating load, often a horizontal platform such as a conventional crane, a swing yarder, or the wind-facing platform of a horizontal-axis windmill. (To "slew" means to turn without change of place.)

Compared to other rolling-element bearings, slewing bearings are thin in section and are often made in diameters of a metre or more; the slewing bearings on the Falkirk Wheel are 4 metre diameter and fit over a 3.5 metre axle. Slewing bearings resemble oversize aircraft control surface bearings.
Slewing bearings often use two rows of rolling elements. They often use three race elements, such as an inner ring and two outer ring "halves" that clamp together axially.
Slewing bearings are often made with gear teeth integral with the inner or outer race, used to drive the platform relative to the base.
As for other bearings that reciprocate, rather than rotating continuously, lubrication can be difficult. The oil wedge built up in a continuously rotating bearing is disrupted by the stop start motion of slewing. Instead, a hydrostatic bearing with pumped oil flow may be used.

Features of Slewing bearings:

1.with excellent rotational accuracy

2. Installing simplifies operation

3. Bear large axial and radial loads

4.Significant savings in installation space

5. High speed capability is limited to changes .

6. Shaft length and reduce processing costs, the geometry of thermal expansion

7. Nylon spacer, low inertia, low starting torque, easy to control angle indexing

8. Optimization of preload, rigidity, high precision guide rollers running  

9. Carburizing steel provides excellent impact resistance and surface abrasion resistance

10. Simple but adequate lubrication