The rod of type 29000 bearing is asymmetric spherical roller, which can reduce the relative sliding of roller and raceway at work. Moreover, the roller is long and large in diameter, the number of rollers is large, and the load capacity is high. Oil lubrication is usually used, and grease lubrication can be used in some cases of low speed. In the design selection, should be preferred;

80000 type thrust cylindrical roller bearing, 90000 type thrust tapered roller bearing and AXK type thrust needle roller bearing can withstand unidirectional axial load, which is much larger than the axial load capacity of thrust ball bearing, and large rigidity, occupy small axial space.

Thrust cylindrical roller bearing and thrust tapered roller bearing are suitable for the occasion of low speed, the speed of thrust tapered roller bearing is slightly higher than that of thrust cylindrical roller bearing. Thrust cylindrical roller bearings are separated bearings, which can only bear unidirectional axial load and slight impact, and can limit the axial displacement of the shaft (or housing) in one direction, so they can be used for unidirectional axial positioning. But its carrying capacity is far greater than that of thrust ball bearings. When the roller rolls, the roller will inevitably slide on the raceway due to the different linear speeds at both ends of the roller. Therefore, the ultimate speed of this kind of bearing is lower than that of thrust ball bearing, and it is usually only suitable for low-speed operation occasions.

The standard design of thrust cylindrical roller bearings is made of wheeled metal solid cage, other types or materials can also be used according to user requirements. The thrust tapered roller bearing can only bear unidirectional axial load and can limit the unidirectional axial displacement of the bearing, so it can be used for unidirectional axial positioning. Compared with thrust cylindrical roller bearings, the bearing capacity is large, the relative sliding is small, but the limit speed is low