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Using zinc alloy gravity casting inner core and 2μm micro-arc oxidation surface, the positioning accuracy of ±0.5° is maintained after 30,000 opening and closing tests, and the torque fluctuation in the temperature difference range from -40℃to 80℃ is less than or equal to 1.2N·m. Specially customized for medical sterile areas and coastal high salt spray scenes, IP55 protection grade and anti-biological corrosion coating achieve a balance of sensory delicacy and industrial-grade weather resistance.