MIL-B-81820E, MILITARY SPECIFICATION: BEARINGS, PLAIN, SELF-ALIGNING, SELF-LUBRICATING, LOW SPEED OSCILLATION, GENERAL SPECIFICATION FOR (21-JUL-1986) [S/S BY SAE-AS81820]

MIL-B-81820E, MILITARY SPECIFICATION: BEARINGS, PLAIN, SELF-ALIGNING, SELF-LUBRICATING, LOW SPEED OSCILLATION, GENERAL SPECIFICATION FOR (21-JUL-1986) [S/S BY SAE-AS81820]., This specification covers plain spherical bearings which are self-aligning and self-lubricating by incorporating polytetrafluoroethylene (PTFE) in a liner between the ball and race (outer ring). PTFE is incorporated in a fabric or composite material bonded to the ID of the outer ring, or in a composite material molded into a pre-formed cavity between the inner and outer ring. These bearings are for use in the temperature range −65 deg F to +325 deg F (−54 deg C to +163 deg C.)