CE UL Fire Rated Door Hinge

A Flag Door Hinge is a heavy-duty lift-off hinge designed specifically for commercial and industrial door systems that require uncompromising durability and easy installation. With its distinctive flag-style structure, this hinge eliminates the need for full removal during door servicing, allowing the door leaf to be easily lifted off the frame—an innovative design that significantly increases efficiency for installation, routine maintenance, and replacement tasks. Our Flag Door Hinges, made of high-strength stainless steel, provide exceptional load-bearing capacity, superior corrosion resistance, and long-term structural reliability, meeting the stringent demands of continuous use in high-traffic, demanding environments. They are widely used in fire-rated doors, steel doors, aluminum doors, and PVC door systems, and are the preferred choice for commercial buildings, hospitals, hotels, office corridors, and industrial facilities. 

Technical Specifications

Product Images and Videos

Product Features & Advantages

• Flag Design for Easy Installation: The innovative flag-style hinge design separates the door-side and frame-side components, allowing installers to mount each part independently before final alignment. Compared with traditional butt hinges that require simultaneous positioning, this structure significantly simplifies on-site work and reduces installation time by approximately 30%. It is especially suitable for PVC and aluminium profiles, where frame thickness and internal reinforcement can vary. Contractors benefit from faster fitting on large projects, while DIY users can achieve accurate results with minimal experience.
• Multi-Grade Stainless Steel Durability: To meet different environmental demands, the hinge is available in SUS201, SUS304, and SUS316 stainless steel options. SUS201 is ideal for dry indoor environments where cost efficiency is a priority, such as bedrooms and offices. SUS304 offers enhanced corrosion resistance for humid areas like bathrooms and kitchens, ensuring stable performance over long-term use. For coastal, outdoor, or chemically exposed environments, SUS316 provides superior resistance to salt spray and aggressive atmospheres, effectively preventing rust, pitting, and surface degradation.
• Aesthetic Versatility: The hinge is offered in a range of finishes to suit different architectural styles and interior designs. SSS (Satin Stainless Steel) delivers a clean, modern appearance suitable for contemporary spaces. AB (Antique Brass) supports more traditional or classic interiors, while PVD black creates a bold, industrial aesthetic. All finishes are designed to coordinate seamlessly with Door Handles and Door Locksets, maintaining visual consistency across the entire door hardware system.

Application Scenarios

• Residential Interior & Balcony Doors: Flag door hinges are widely used in residential PVC and aluminum doors where precise alignment and smooth operation are essential. Their flag-style structure allows fast positioning and accurate door-to-frame adjustment, making them ideal for bedroom doors, balcony doors, and bathroom doors. Stable load-bearing performance ensures quiet, consistent operation during daily use, improving overall living comfort.
• Apartment & Condominium Projects: In large-scale apartment and condominium developments, installation efficiency and consistency are critical. Flag door hinges simplify on-site installation and significantly reduce adjustment time, helping contractors meet tight construction schedules. They are commonly applied to apartment entrance doors, internal functional doors, and shared-area doors, delivering long-term stability with minimal maintenance.
• Commercial Office Buildings: Office environments require door hardware that can withstand frequent opening and closing while maintaining smooth, silent movement. Flag door hinges are engineered for aluminum and PVC door systems used in offices, meeting rooms, and internal corridors. Their clean appearance complements modern architectural designs, while their durable construction ensures reliable performance in high-traffic areas.

Customization Options

• Material Selection: Buyers can select SUS201, SUS304, or SUS316 stainless steel based on environmental conditions, budget considerations, and performance requirements.
• Finish Customization: In addition to standard finishes, custom PVD colors such as bronze or gunmetal are available. Optional anti-fingerprint coatings help maintain a clean appearance in high-touch areas.
• Size Modifications: Custom dimensions can be developed for non-standard PVC or aluminium door profiles. 3D modeling support ensures precise fit and smooth integration into existing systems.
• OEM/ODM Services: Private-label branding and customized hinge designs, including functional enhancements such as integrated door stops, are available for project-specific or brand-driven requirements.

Production Process & Quality Control

1. Material Testing: All stainless steel materials undergo XRF analysis to verify chemical composition. Any impurities exceeding 0.01% are rejected to ensure consistent corrosion resistance and mechanical strength.
2. Precision Stamping & Machining: Hinge components are stamped and machined with tolerances controlled to ±0.01 mm, ensuring accurate fit and smooth interaction between moving parts.
3. Surface Finishing: SSS and PSS finishes are processed through a three-stage polishing procedure to achieve uniform texture and appearance. PVD coatings are bonded at temperatures up to 500°C, enhancing scratch resistance and color stability.
4. Performance Testing: Sample hinges are tested for over 50,000 operating cycles, 60 kg load-bearing capacity, and 240-hour salt spray resistance to validate durability under real-world conditions.
5. Final Inspection: Before packaging, each hinge undergoes a 100% visual and functional inspection to confirm dimensions, surface quality, and operational performance, ensuring only qualified products reach customers.