Special operating conditions may require angular contact spherical plain bearings with a steel/ PTFE fabric or steel/steel sliding contact surface combination. These bearings are available on request.
Bearings with a maintenance-free steel/PTFE fabric sliding contact surface combination (fig. 1) should be used when lubricant-free operation is specified. These bearings can accommodate heavy loads, preferably in a constant direction.
Steel/steel bearings (fig. 2) are typically used in applications where operating temperatures or load frequencies are high, or where heavy or shock loads occur. To operate properly, steel/steel bearings must be provided with an adequate supply of lubricant. Depending on the operating conditions, the sliding surface of the outer ring may be equipped with various multi-groove patterns ("waffle" grooves, fig. 3; "diamond thread" grooves, fig. 4). For additional information, contact the SKF application engineering service.
Upon request, inch steel/steel angular contact spherical plain bearings are also available as double direction angular contact spherical plain bearings. Double direction bearings can be used instead of two angular contact bearings in a face-to face arrangement, or as a high capacity radial bearing. Double direction angular contact spherical plain bearings consist of two outer rings and a standard inner ring. SKF supplies these bearings with (GEZPR .. S series) or without (GEZP .. S series) a shim between the two outer rings. The shim simplifies installation and optimizes axial internal clearance within the bearing (fig. 5).