A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6135-01-333-6737
NSN 7035-00-445-9657
NSN 5895-00-357-9463
NSN 5950-00-469-3103
NSN 5920-01-164-8260
NSN 5950-01-436-1517
NSN 5920-01-264-9964
NSN 6620-01-354-8472
NSN 6105-00-452-3855
NSN 6130-00-199-0514
NSN 5925-01-204-9441
NSN 5855-00-688-9954