MIL-B-27497C, MILITARY SPECIFICATION: BEARING, JEWEL, SAPPHIRE OR RUBY, SYNTHETIC (27-APR-1978)

MIL-B-27497C, MILITARY SPECIFICATION: BEARING, JEWEL, SAPPHIRE OR RUBY, SYNTHETIC (27-APR-1978)., This specification covers jewel bearings furnished both in synthetic sapphire and ruby material produced by the Verneuil process.