A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5985-00-776-5005
NSN 5910-01-640-9865
NSN 5945-01-383-7088
NSN 5965-00-045-7156
NSN 6645-00-509-9008
NSN 5855-01-076-5202
NSN 6320-01-397-9995
NSN 5960-01-312-1262
NSN 6135-01-508-3784
NSN 6150-01-519-6396
NSN 5930-01-603-0254
NSN 6150-01-255-4760