... : HRC 55--65 4) Complying with GB, ASTM, DIN, JIS standards 5)good surface Features:Size: 0.6mm Grades: G100 ... , Stainless steel, Copper, Aluminum Complying with GB, ASTM, DIN, JIS standards Use: hardware, bearings, guide sleeves, guide rails, grinding materials ... fatigue resistance in hardness, crushing load etc., can achieve the equivalent to bearing steel ball standard. However, its price is far ...