1.Precision forged ball stud and housing 2.High-frequency treatment 3.Strictly quality ... , Machining, Rust Proof, Assembly, Tensile Test, InspectionEquipmentElectricity hydraulic die forging hammer, Friction press, Crankshaft press,Electric furnace,Roll forging machine, Metallographic ... tons of forging blank, 600000 pairs of tie rod and ball joint assembly ball joint(Professional Factory)