A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5999-00-728-2086
NSN 5835-01-276-4621
NSN 6320-01-428-9205
NSN 6130-01-552-6395
NSN 5965-00-228-8336
NSN 6105-00-731-4341
NSN 6320-01-382-9676
NSN 5905-01-152-1874
NSN 5925-01-052-7670
NSN 6145-00-939-4973
NSN 5999-01-179-0704
NSN 5965-00-920-0455