A slewing bearing or slewring is a rotational rolling-element bearing that typically supports Crane and Excavator Slewing Ring Bearing a heavy but slow-turning or slow-oscillating load, often a horizontal platform such as a conventional crane, a swing yarder.

Slewing rings are one of the most important parts of cranes.

The slewing ring provides the crane KOYO dac3055w Bearing with its possibility to rotate while lifting loads.