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The CNC machining steel usually get good tolerance(even +/-0.002mm) and good surface performance(Ra 1.6). CNC machining（turning/3,4,5 axis milling/WEDM） mild steel and stainless steel. eg: Q235A/B,AISI 1010,AISI 1015,,AISI 1018,AISI 1020,AISI 1025,AISI 1040,AISI 1045,AISI 1050,AISI 304,AISI 4130,AISI 4140,SUS 201,SUS 301,SUS 303,SUS 304,SUS 316,SUS 316L,SUS 401,SUS 409,SUS 410,SUS 416,SUS 430,SUS 440. Finish options: Black Oxide,Cataphoresis,Passivation,Nickel Plating,ASTM B733 ELECTROLESS NICKEL,TYPE IV(MED PHOS),3.81um+-1.27um THICK,CLASS 5 HEAT TREAT.Powder Coating,Electrical insulation Powder Coating,Zinc Plating,ZN PLATED PER ASTM B633-13,SC1,TYPE II, TYPE II.etc.