A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 2925-01-201-3043
NSN 5895-00-397-7852
NSN 2925-01-022-8332
NSN 5855-00-631-4565
NSN 5950-00-278-4186
NSN 5975-01-483-1809
NSN 5925-01-604-8985
NSN 6320-01-052-2118
NSN 6650-01-615-4842
NSN 6105-01-056-5258
NSN 6110-01-025-9773
NSN 5965-01-320-0260