A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5999-01-556-7931
NSN 6645-00-933-0529
NSN 5965-00-852-6258
NSN 5999-01-195-7571
NSN 6650-01-185-9067
NSN 6650-01-448-9639
NSN 6320-01-652-3806
NSN 6135-00-548-2765
NSN 6220-00-224-5402
NSN 5905-01-343-4561
NSN 5895-01-215-1059
NSN 5910-00-823-6310