A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6650-01-218-9337
NSN 5998-01-608-5048
NSN 6685-01-191-1539
NSN 6145-01-484-8735
NSN 5835-00-725-2087
NSN 5975-01-144-1309
NSN 5996-01-064-4868
NSN 6220-01-314-5896
NSN 5998-01-418-5661
NSN 6620-01-240-2401
NSN 5985-01-328-1750
NSN 6620-00-919-6710