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High Quality Car Ball Joint Factory Manufacturer China High accuracy,High steering sensitivity,High safety. Spherical shell: We choose Fine finish forge #45 carbon steel; CNC lathe precision finishing; Fillet high-frequency treatment; HRC52-58 after thermal treatment. Bush: OEM quality Ball joint pin:Fine 40Cr steel cold forging; CNC lathe precision finishing; HRC52-58 after thermal treatment; Outter surface highly burnished. Ball cup: 4YS ball cup. Oil:MOS2. Work normally from -40°C to 120°C. Various Vehicle Models