A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5855-00-941-6412
NSN 6320-01-388-1067
NSN 7035-01-048-7122
NSN 5915-00-504-9416
NSN 5985-01-310-6121
NSN 5975-01-475-8781
NSN 6610-00-277-7206
NSN 6130-00-222-9206
NSN 6110-01-651-1913
NSN 4140-01-261-7953
NSN 6620-01-441-7896
NSN 5925-01-517-5466