A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6145-01-357-6288
NSN 6620-01-369-5876
NSN 5950-01-447-2839
NSN 5910-00-146-5774
NSN 6240-01-100-1279
NSN 6135-01-556-7318
NSN 5960-01-295-8924
NSN 6130-01-153-2265
NSN 6240-01-277-7962
NSN 5945-00-947-0547
NSN 5895-01-258-5671
NSN 5905-01-069-3419