A slewing bearing or slewing ring 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. Slewing bearings with internal gear are often made with gear teeth integral with the inner or outer race, used to drive the platform relative to the base. We produce different slewing bearings with internal gear to meet your your various needs of the slewing ring bearing with internal gears.