NJG design bearings, which comprise the heavy 23 dimension series, are intended for very heavily loaded, low-speed applications. These bearings have two integral flanges on the outer ring and one on the inner ring (fig. 2). NJG design bearings have a self-retaining roller complement. Therefore, the outer ring with the roller complement can be separated from the inner ring without having to take special precautions to prevent the rollers from falling out (fig. 3). This simplifies mounting and dismounting.