These bearings have a self-aligning nature that uses barrel-shaped rolling elements, with a spherical surface on which the raceway surface of the housing raceway washer (outer ring) is centered on the guide sleeve. They can bear high axial loads.As there are many sliding surfaces such as the roller end surfaces and the cage, oil lubrication must be used even in low-speed operation.These are thrust bearings using tapered rollers. The single-type bearings include those with and without ribs on the housing raceway washers, as well as the full complement roller type. Double-type bearings are mainly used to support axial loads such as those on rolling mill roll necks.