It is used to bear the sum of axial and radial load and main shaft load, 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 coefficient of friction, higher speed and self-aligning performance. The rod of the 29000 bearing is asymmetric spherical roller, which can reduce the relative sliding of the roller and the working raceway. The roller is long and large in diameter, the number of rollers is large, and the load capacity is high. Usually lubricated with oil. Grease can be used for individual low speed conditions.