A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6130-01-015-9447
NSN 5960-01-425-1454
NSN 6130-00-052-6248
NSN 6150-00-253-6554
NSN 5925-01-146-9641
NSN 6620-01-618-9854
NSN 5985-01-445-9078
NSN 6130-00-833-7763
NSN 5999-01-224-6651
NSN 5905-01-523-7643
NSN 6135-00-307-6998
NSN 5999-01-201-9254