... Introduction of precision castings for aviation:1)Material: Grey Iron, Ductile Iron, Carbon steel, stainless steel, bronze, alloy ... steel2)Surface Finish: Zinc/nickel/chrome plating, hot galvanized, painting, polishing, sand blasting3)Available Service: Lost Wax casting ... 35e. Angle tolerance: ≤±0.5°f. Min. casting hole diameter: D ≥ Φ2g.Surface roughness Non- ...