A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5905-01-415-0869
NSN 5905-00-719-4545
NSN 5996-00-724-2021
NSN 5835-01-209-6410
NSN 6240-01-401-5340
NSN 5975-01-458-8793
NSN 6220-01-189-7990
NSN 5998-00-820-1988
NSN 5965-01-641-7342
NSN 2925-01-633-4048
NSN 5895-01-378-7697
NSN 5996-01-153-2359