| Radial internal clearance, preload Internal clearance in a single angular contact spherical plain bearing is only obtained after mounting and is dependent on adjustment against a second bearing, which provides axial location in the opposite direction. Angular contact spherical plain bearings are generally mounted in pairs in a back-to-back or face-to-face arrangement; the bearings are adjusted against each other by axially displacing one bearing ring until a specific bearing load of 10 N/mm2 is obtained. The preload prevents some of the elastic and plastic deformations, which would occur under load and after a short period of operation. When adjusting bearings for the first time in a new arrangement, the specific bearing load of 10 N/mm2 is achieved when the fric-tional moment and the axial preload force lie in the ranges specified in Table ^ . Materials The inner and outer rings of SKF angular contact spherical plain bearings are made of through hardened and ground steel. The sliding surface of the inner ring is hard chromium plated and coated with a lithium base grease. The sliding layer of glass fibre reinforced plastic containing PTFE additives is injection moulded in the outer ring. |