... test 3.CNC Machining Center 4.Inspected by CMM 5. Ra1.0, Polish Ra0.4 Piston casting used for industrial clutch ... , Template parts, Railway fittings, ring flange , electromagnetic steel cover, piston, pressure plate, center plate, wear plate, cylinder, impeller, disc ... and stable in quality;3. Circumspect and satisfactory of service,4. Punctual delivery time; Currently material for other castings: ...