A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5996-00-248-7061
NSN 5935-00-513-9606
NSN 5990-00-056-3177
NSN 6645-01-348-5722
NSN 5925-01-590-9058
NSN 5985-00-244-5147
NSN 6650-00-518-6318
NSN 6135-01-415-4124
NSN 5915-01-325-7772
NSN 5950-00-081-0461
NSN 5935-01-549-1203
NSN 4140-00-009-0233