Thrust roller bearings are used to withstand axial and radial combined loads, but the radial load shall not exceed 55% of the axial load. Compared with other thrust roller bearings, this type of bearing has a lower friction coefficient, higher rotational speed, and has centering performance. Thrust cylindrical roller bearings are mainly used in heavy-duty machine tools, high-power marine gearboxes, oil drilling rigs, vertical motors, and other machinery. Thrust cylindrical roller bearings and thrust tapered roller bearings are suitable for low speed situations, with thrust tapered roller bearings having slightly higher speeds than thrust cylindrical roller bearings. Thrust cylindrical roller bearings are separable bearings that can only withstand unidirectional axial loads and slight impacts, and can limit the axial displacement of the shaft (or shell) in one direction. Therefore, they can be used for unidirectional axial positioning. But its load-bearing capacity is far greater than that of thrust ball bearings. When rolling, due to the different linear speeds at both ends of the roller, sliding of the roller on the ring raceway is inevitable. Therefore, the limit speed of this type of bearing is lower than that of thrust ball bearings, and it is usually only suitable for low-speed operation situations.