Round Corner UL Listed Stainless Steel 316 Silver Fire Proof Exterior Door Hinges-DDSS001-FR-4X3.5X3

1. Technical Specifications

Certification Standards: The product holds UL/cUL certification, meeting UL 10C requirements with a fire rating of 3 hours. Certification document number R38013 may be verified on the UL official website. It also complies with ANSI/BHMA A156.1 Grade 1 standards, having passed 2 million opening/closing cycles to ensure exceptional durability in outdoor environments. All certification documents are supplied with the goods for purchasers' project acceptance purposes.

Material Composition: Manufactured from 316 stainless steel, offering over 50% greater corrosion resistance than 304 stainless steel. Particularly suitable for coastal regions and highly polluted environments.

Dimensions: Standard 4-inch × 3.5-inch rounded corner design, 3.0mm thickness, R3mm corner radius. Load capacity: 100kg per hinge. Opening angle: 180 degrees. Surface features a satin stainless steel finish with a roughness of Ra0.4-0.6μm, ensuring aesthetic appeal and durability while providing anti-fingerprint properties.

2. Product Features

Exceptional Weather Resistance: Crafted from 316 stainless steel, this Exterior Door Hinge incorporates a unique molybdenum alloy composition delivering superior corrosion resistance. Particularly suited for coastal zones, industrial areas, and other highly corrosive environments, its service life exceeds that of standard Exterior Door Hinges by over 200%.

UL Certified Safety Assurance: The product holds UL 10C 3-hour fire rating certification, representing the highest safety standard in exterior door hinges. Each hinge bears a permanent UL mark, ensuring full traceability. Our certification advantage lies not only in meeting standard tests but also in verifying reliability under extreme conditions, providing double assurance for purchasers.

Intelligent Protection Design: Rounded corners enhance aesthetics while eliminating safety hazards from sharp edges. An integrated waterproof sealing system achieves IP54 protection, effectively preventing rain and dust ingress. A special self-lubricating bearing system ensures smooth operation across temperatures from -40°C to 80°C, adapting to diverse climatic conditions.

3. Application Scenarios

Commercial Building Main Entrances: These Exterior Door Hinges are ideally suited for main entrance door systems in premium office buildings and shopping centres. Their elegant silver satin finish seamlessly integrates with contemporary architectural aesthetics, while UL fire certification ensures safety in high-traffic areas. The 316 stainless steel construction offers weather resistance for frequent use and diverse climatic conditions.

Hotel & Resort Exterior Doors: Premium hotels and resorts require exterior doors that balance aesthetics with durability. Rounded edges prevent accidental scratches to guests, while corrosion resistance withstands salt spray in coastal environments. Fire-rated performance meets the hospitality industry's highest safety standards, delivering peace of mind.

Medical Facility Exits: Exterior door hinges for hospitals and healthcare centres demand reliability. 316 stainless steel's chemical resistance withstands disinfectant exposure, while fire safety ensures secure evacuation during emergencies. Silent operation maintains the tranquillity of clinical environments.

High-end Residential Communities: Exterior door systems in residential developments require long-lasting, durable hinges. The product's weather resistance ensures colour retention over extended use, while UL certification provides safety assurance. The rounded corners are particularly suited to family environments with children, enhancing usage safety.

5. Installation Guidelines

Preparation and inspection before installation: Before installation, please carefully check the model and certification mark of the Exterior Door Hinges to confirm that the product meets the project requirements. Measure the thickness of the door leaf and frame to ensure it matches the hinge size. Prepare stainless steel installation screws and professional installation tools, including torque screwdrivers, level gauges, and hole positioning templates. Clean the installation surface to ensure no oil stains or impurities, and prepare for installation.

Accurate positioning and installation: Use a dedicated positioning template to accurately mark the installation position, ensuring that all Exterior Door Hinges are installed at the same height. First, install the door frame section and tighten it with a torque screwdriver to a standard torque of 3.2N · m. When installing the door leaf, ensure that the hinges are perfectly aligned and use a spirit level to check the verticality. Pay attention to maintaining an appropriate gap between the door seams to ensure smooth opening and closing of the door leaf.

Debugging and final acceptance: After installation, conduct comprehensive functional testing. Open and close the door leaf multiple times to check if the Exterior Door Hinges runs smoothly and silently. Test the retention performance of the door leaf at different positions and adjust to ensure there is no self opening or closing phenomenon. Finally, conduct a fire seal inspection and use a gap gauge to confirm that all gaps comply with safety regulations. Complete installation records and provide user manuals for use and maintenance.