... 11 main equipment used: automatic precision lathe and cncmachines, suitable for electric products, automatic 12 Free Samples CNC milling and turning ... secondary machiningHeat treatment: annealing, normalizing, tempering, nitriding, carbonitriding, carburizing, and induction hardening Surface treatment: plating, coating, phosphate, anodizing, and CVD/PVD platingOEM ...