A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5975-01-286-3117
NSN 6145-00-887-6395
NSN 6220-01-104-5604
NSN 5930-00-987-7113
NSN 5950-00-178-0362
NSN 6620-01-117-0834
NSN 6645-01-583-8153
NSN 6240-01-377-2560
NSN 5835-01-484-4698
NSN 2925-01-408-9485
NSN 5960-00-078-9500
NSN 6150-00-949-1984