Single row tapered roller bearings are able to harness both radial and axial forces. The axial load capacity depends on the degree of the contact angle. These parts are able to control the axial load in one direction only and that is wht they are assembled in pairs. The axial clearance or preload designated in these pairs of bearings is to be adjusted during assembly. The amount of the axial clearance or preload is determined according to the following criteria: operating conditions, the size and type of the roller beaings, and the specific requirements of the mating arrangements rigidity.