A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5905-01-585-7464
NSN 5895-01-313-5572
NSN 6105-01-152-8496
NSN 5915-01-226-5880
NSN 5945-00-279-6554
NSN 5996-00-278-4441
NSN 6685-00-596-8765
NSN 5950-01-503-3625
NSN 6650-01-359-5385
NSN 5910-00-404-8824
NSN 5915-00-513-9701
NSN 5985-01-204-9040