440C stainless steel balls render a great integral hardness, with a remarkable resistance to corrosion caused by water, steam, air as well as by gasoline, oil and alcohol. High degree of surface finish and very precise size tolerances make this type of stainless steel are the best for the usage in stainless steel high precision ball bearings, valves, ball pens and other stiff environment application.
440C steel is similar to 440 steel. It has a higher C chemical content, so the hardness is also higher than 420.
