A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5835-00-711-3371
NSN 5996-01-218-0522
NSN 5935-01-441-5771
NSN 5935-00-466-1792
NSN 6130-00-168-1229
NSN 6130-01-487-3758
NSN 5895-01-107-6436
NSN 5910-00-497-0856
NSN 6240-01-523-1541
NSN 6105-00-010-2386
NSN 7035-01-556-7412
NSN 6610-01-354-7963