A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6620-01-586-4260
NSN 6645-01-100-3296
NSN 6110-00-269-2696
NSN 5835-01-245-8077
NSN 6145-01-360-5863
NSN 7035-01-296-4737
NSN 6130-00-240-9526
NSN 6150-01-581-9870
NSN 6620-00-212-6921
NSN 5905-01-618-3213
NSN 5930-01-447-7516
NSN 5975-01-158-5094