1,precision stamping metal parts with grinded surface 2,customized sureface treatment 3,High QC ... C26800), C37700 ( HPb59), C38500( HPb58), C27200(CuZn37), C28000(CuZn40)4. Bronze: C51000, C52100, C54400, etc5. Iron: 1213, 12L14,12156. Aluminum: ... shafts(axles, spline shafts, dart shafts),gears (pinions, wheels ) bearing, bearing seat, spring, connector, socket, bushing, push-button, etc.Surface ...