A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5925-00-510-6922
NSN 5996-00-720-3064
NSN 6645-01-406-0688
NSN 5965-01-067-4946
NSN 5999-01-654-0619
NSN 5895-01-495-6145
NSN 2925-01-341-0457
NSN 5965-01-566-7184
NSN 5999-00-055-5146
NSN 6610-00-170-6715
NSN 6220-00-986-1428
NSN 5905-01-626-2362