Xcboying0808 (at) 163.com These balls are normally used in precision ball bearings and many industrial applications. The balls made of this kind of material feature excellent surface finish, considerable hardness and a high load carrying capacity, as well as excellent wear and deformation resistance. Chrome steel balls are through hardened in ord to achieve the maximum mechanical strength. Average hardness index: HRC 61-66 Diamerers:3.175—25.4mm, Precision grade: ISO 3290 G10-20-28-40-100-200- AFBMA G500/G1000