Tapered roller, as the rolling elements in the bearing assembly, guided by the inner edge of a large file. Can bear radial load and axial load in one direction, load capacity. As a high load bearing capacity, an increase in the size of the rollers and roller number of HR series. With the same radial thrust bearing, generally opposed to the use of the two bearings.In this case, the axial direction can be adjusted according to the same or similar inner outer space, in order to obtain the set clearance. Because it is a separate, inner and outer rings, respectively disassembled. Since the contact angle of different sizes, sub-normal cone triangle, the angular cone, large cone triangle, the number of columns from the roller can be divided into two-row and four-row tapered roller bearings. Generally, the use of steel stamping cage.