A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5965-01-461-2850
NSN 6135-00-078-9931
NSN 6135-01-077-5705
NSN 5990-01-421-3325
NSN 6130-00-460-8705
NSN 5855-00-763-2155
NSN 5965-01-554-4929
NSN 5985-01-605-1950
NSN 6110-01-144-7006
NSN 5910-00-917-9325
NSN 5895-00-596-1729
NSN 6240-00-383-7668