Self-Closing Reinforced Hinge Iron Courtyard Door | Durable & Heavy-Duty Design

The self closing reinforced hinge iron courtyard door integrates mechanical automation with structural durability, ideal for applications requiring consistent closure. Engineered with hydraulic or spring loaded hinges, the door automatically returns to the closed position after opening, reducing the risk of unauthorized entry or weather exposure. The hinges are constructed from 316 stainless steel with double row ball bearings, capable of withstanding 500,000+ cycles while supporting door weights up to 400kg. Adjustable tension valves allow customization of closing speed (0.5–2m/s) and latching force, compliant with ADA standards for accessibility. The door panel features a 4mm thick hot rolled steel core, reinforced with horizontal channels for rigidity, and all joints are fully welded and ground smooth. Surface treatments include a zinc nickel alloy electroplate (12μm) followed by a polyester powder coat, achieving 1000+ hours of salt spray resistance. A built in anti slam mechanism prevents damage from abrupt closures, while a manual override lever enables temporary disablement of the self closing function. This door is popular in commercial complexes, institutional buildings, or residential properties where passive security and convenience are prioritized.