... : G100--G1000 3) Hardness: HRC 55--65 4) Complying with GB, ASTM, DIN, JIS standards 5)good surface Features:Size: ... Materials: Carbon steel, Chrome steel, Stainless steel, Copper, Aluminum Complying with GB, ASTM, DIN, JIS standards Use: hardware, bearings, guide sleeves, ... resistance in hardness, crushing load etc., can achieve the equivalent to bearing steel ball standard. However, its price is far ...