A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6645-01-513-4782
NSN 6110-01-459-9022
NSN 7035-00-513-9764
NSN 6685-01-555-7938
NSN 5975-00-165-1089
NSN 5965-01-318-0758
NSN 2925-01-283-3576
NSN 5920-01-651-7453
NSN 5998-00-596-7177
NSN 5945-00-428-6353
NSN 6145-00-409-6844
NSN 6620-00-854-5024