4)Hardness: Hrc 61--66
5) Producing standard:GB308-2002
6)Feature: Good wearing, excellent surface quality and high hardness.
1. General industry for automobile, motorcycle, bicycle manufacturing, special bearings & micro ¨C ball for the electronics industry..
2. High accuracy & low noise motor bearing& household appliance bearings3. High - speed, low noise special bearing4. Ball valves for liquid and gas etc.