This type of bearing can limit the axial displacement of the shaft and housing in one direction and withstand axial loads in one direction. Under the action of radial load, additional axial force will be generated, so it is generally used in pairs in the two supports of the shaft. The 31300 series tapered roller bearings have a large contact angle (27 °~30 °) and can withstand large axial loads. The contact angle of other series of bearings is between 10 ° and 18 °. If the contact state between the roller and the ring is appropriate, it can not only prevent abnormal edge loads on the contact surface, but also allow for tilting of the inner and outer rings caused by installation errors. The allowable tilt angle for tapered roller bearings is generally 0.0005 rad (1.5 ‘) for single row and back-to-back combinations, and 0.001 rad (3.5’) for face-to-face combinations.