Diameters: 0.250mm - 200mm Chrome steel balls are widely used in high speed ball bearings, as well as, in a number of other industrial applications. Chrome steel balls have excellent surface quality, high hardness and high load bearing capacity, as a result of through hardening.International Equivalents for chrome steel balls: AISI 52100, EN31, JIS G4805 SUJ2, Wks 1.3505