A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5996-00-456-8705
NSN 6240-01-578-6227
NSN 6105-01-102-2432
NSN 6105-01-381-1088
NSN 5999-01-599-2860
NSN 2925-01-564-3847
NSN 5950-00-136-0329
NSN 5910-01-427-3819
NSN 6145-01-259-6439
NSN 5975-00-218-0414
NSN 7035-01-151-0265
NSN 2925-01-254-3068