A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6130-01-482-9096
NSN 5895-01-580-0080
NSN 5965-01-546-2939
NSN 5950-01-083-2951
NSN 5835-01-463-2334
NSN 5996-00-550-7606
NSN 5920-01-433-2261
NSN 5905-00-730-3965
NSN 6135-00-883-9024
NSN 5960-01-489-1510
NSN 2925-01-350-0200
NSN 5905-01-394-5961