A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5950-00-924-9993
NSN 5950-01-272-3895
NSN 5905-01-023-1732
NSN 6645-01-265-0648
NSN 5999-01-020-7641
NSN 6220-01-171-4738
NSN 6135-01-483-5269
NSN 6110-00-218-0967
NSN 5999-01-089-2133
NSN 5925-01-408-8765
NSN 2925-01-633-4048
NSN 5965-01-478-9375