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Bearing data

Dimension standardsBoundary dimensions:
ISO 12240-2:1998

Tolerances
ISO 12240-2:1998 (table 1)

Materials

Inner and outer rings: through-hardened and ground bearing steel
Inner ring sliding surface: hard chromium plated and coated with a lithium base grease

Sliding layer of fibre reinforced polymer, containing PTFE, is injection moulded onto the outer ring (fig. 1)

Permissible operating temperature range

-40 to +75 °C (-40 to +165 °F), for brief periods up to +110 °C (+230 °F);
reduced load carrying capacity at temperatures above +50 °C (+120 °F); 

For additional information, contact the SKF application engineering service.



Radial internal clearance, preload

The internal clearance of a single angular contact spherical plain bearing is only obtained after mounting and depends on the adjustment against a second bearing that provides axial location in the opposite direction. Angular contact spherical plain bearings are generally mounted as pairs in a back-to-back (fig. 2) or face-to-face arrangement (fig. 3). 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 deformations that typically occur under load and after a brief running-in period. When adjusting a new bearing arrangement for the first time, the specific bearing load of 10 N/mm2 is achieved when the frictional moment and the axial preload force are in the ranges listed in table 2.
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