... CMM 5. Ra1.0, Polish Ra0.4 Piston casting used for industrial clutch and brakes.1. Material: ASTM ... products:Scaffold fittings, Template parts, Railway fittings, ring flange , electromagnetic steel cover, piston, pressure plate, center plate, wear plate, cylinder ... satisfactory of service,4. Punctual delivery time; Currently material for other castings: categoryExamplesCarbon steels 1020, 1030, 1040, ...