Our stock range includes disc springs to din 2093 and din 6796 specifications bearing preload disc springs medium and light duty serrated safety. All are 718 nickel a high strength corrosion resistant alloy that s also known as inconel. X12crni 17 7 to din 17 224 is a chrome nickel alloy commonly used for corrosion resistant disc springs the material gains its strength from cold rolling therefore its maximum thickness must be limited.