Double-row ball bearing

  Technical Guide Slewing Bearings for Machine Tools A Complete Buyer's Guide What Is a Slewing Bearing? A slewing bearing (also called a slew ring or rotation bearing) is a large-diameter rolling-element bearing designed to support combined loads - axial, radial, and moment (tilting) loads - simultaneously, while allowing a rotating platform to turn smoothly relative to a fixed base. Unlike a standard ball bearing, which usually handles only one or two load types, a slewing bearing is built as a compact, self-contained rotation system. It typically integrates: An inner ring and outer ring, one of which is usually gear-cut (internal or external teeth) for drive engagement Rolling elements - balls or rollers - arranged in one or more rows between the rings Mounting holes for direc...