Stainless Steel Balls, Type 440C Hardened. Type 440C Stainless Steel is widely used in antifriction bearings, in valves and in many other applications where high hardness and reasonable corrosion resistance are required. This material is …Precision Balls - Ball Products - Abbott Ball Company2018-3-1 · Abbott precision balls are available in grades 3 to grade 50, lap finished 300 series, 440C, 440CVM, 52100 Chrome, vacuum melt chrome balls and soft stainless steel grade 25 balls. Abbott conforms to ABMA standards, which dictate the specific parameters associated with the grade of a ball. Sphericity - the better the grade of ball the closer to ...Bal-tec - Bearing Steel for Steel BallsC/S - Chrome Steel, 52100, Chrome. All of the above are common ways of describing the most widely used material for the manufacture of precision steel balls. It is a through hardening, fine grain, Martensitic steel. Because of its high hardness and fine grain structure, this material can be finished to an extremely fine quality.