CE UL Fire Rated Door Hinge

UL Fire Rated Square Corner Heavy Duty Hinge - DDSS008-FR

Product Overview

As a heavy-duty solution in D&D HARDWARE’s fire-safe door hardware lineup, the UL Fire Rated Square Corner Heavy Duty Hinge (Model: DDSS008-FR) is engineered to combine exceptional strength, fire resistance, and structural stability for high-demand commercial and residential fire doors. Certified to UL10C standards with a 3-hour fire rating, this hinge undergoes rigorous testing to withstand extreme temperatures—providing critical evacuation time and minimizing fire spread in emergencies.

Its square corner design ensures a tight, stable fit with door frames, while the heavy-duty stainless steel construction (available in SUS201, 304, 316) delivers durability for high-traffic areas like hospital corridors, hotel lobbies, and office stairwells. Equipped with four ball bearings, it enables smooth, quiet door operation even under heavy door weight (up to 200lbs). As a professional door hinges manufacturer with over 18 years of expertise, D&D ensures this hinge seamlessly integrates with our door closers, panic exit devices, and door locksets, forming a complete, code-compliant fire-safety system—making it the ideal choice for buyers prioritizing long-term reliability and safety.

Product Images and Videos

Technical Specifications

• Model Number: DDSS008-FR
• Brand: D&D HARDWARE
• Type: UL Fire Rated Square Corner Heavy Duty Hinge
• Fire Certification: UL10C Fire Rated (3 Hours), UL File Number: R38013
• Material: Stainless Steel (SUS201, SUS304, SUS316 options)
• Bearing: Four Ball Bearings (for smooth, heavy-duty operation)
• Dimensions: 5.0"x4.0"x3.4mm, 5.0"x4.5"x3.4mm, 5.0"x4.0"x4.6mm, 5.0"x4.5"x4.6mm, 5.0"x5.0"x4.6mm, 5.0"x4.0"x4.8mm, 5.0"x4.5"x4.8mm, 5.0"x5.0"x4.8mm (length x width x thickness)
• Finish Options: SSS (Satin Stainless Steel), PSS (Polished Stainless Steel), AB (Antique Brass), AC (Antique Copper), PVD (Physical Vapor Deposition)
• Load-Bearing Capacity: Up to 200lbs (suitable for heavy fire doors and solid wood doors)
• Design Styles: Compatible with Modern, Traditional, Contemporary, and Industrial aesthetics
• Warranty: 5 Years Mechanical Warranty
• Place of Origin: Jiangmen, Guangdong, China
• Supply Capacity: 200,000 pieces per month
• After-sales Service: Online Technical Support
• Engineering Solutions: Graphic Design, 3D Model Design

Product Features & Advantages

• UL10C 3-Hour Fire Protection: Certified to UL10C standards (UL File No. R38013) to maintain structural integrity at 1700°F for 3 hours, meeting global fire codes (NFPA 80, EN 1634) and ensuring compliance for high-risk spaces like hospitals and schools.
• Square Corner Stability: Precision-machined square corners create a tight, gap-free fit with door frames—enhancing door stability, preventing fire/smoke penetration, and complementing the clean lines of modern door handles and door knobs.
• Four Ball Bearing System: Four integrated ball bearings reduce friction by 60% compared to standard hinges, enabling smooth door operation even for 200lbs heavy doors. This design also extends the hinge’s lifespan by minimizing wear (tested to 150,000 open/close cycles).
• Multi-Grade Stainless Steel Options: Choose SUS201 (cost-effective for dry indoor areas), SUS304 (corrosion-resistant for bathrooms/kitchens), or SUS316 (industrial-grade for outdoor/coastal applications)—ensuring optimal performance for any environment.
• Versatile Finish Selection: Finishes like SSS, PSS, AB, AC, and PVD match diverse interior/exterior designs (e.g., PVD black pairs with modern door locksets; AB complements traditional hotel decor).
• Heavy-Duty Durability: Thick-gauge stainless steel (3.4mm-4.8mm) resists bending and deformation, even under frequent heavy use—ideal for high-traffic areas like mall entryways and apartment staircases.
• System Compatibility: Works seamlessly with D&D’s door closers (for automatic fire-door closure), door seals (for enhanced fire resistance), and panic exit devices (for emergency egress)—simplifying one-stop door hardware sourcing.

How to Install the UL Fire Rated Square Corner Heavy Duty Hinge (Step-by-Step)

1. Prepare Tools & Materials: Gather a mortise chisel, hammer, drill (with masonry bit for concrete frames), screwdriver, measuring tape, pencil, and the DDSS008-FR hinge (include heavy-duty fire-rated screws). For full compliance, pair with D&D’s door seal.
2. Mark Hinge Positions: On the door edge and frame, measure and mark 3 hinge locations (7" from the top, 11" from the bottom, and centered) to evenly distribute weight. Use a square tool to ensure marks align with the door’s square corners—avoiding misalignment that could affect stability.
3. Cut Mortises: Use the mortise chisel to carve recesses (mortises) into the door and frame. The mortise depth must match the hinge leaf thickness (3.4mm-4.8mm) to ensure a flush fit—no凸起 (bulges) that could block door closure.
4. Secure Hinge Leaves: Place one hinge leaf into the frame mortise, drill pilot holes (to prevent wood splitting or concrete cracking), and fasten with heavy-duty screws (tighten to 25 ft-lbs torque for stability). Repeat to attach the second leaf to the door. Check alignment with a level tool.
5. Install Hinge Pin & Test: Align the door’s hinge leaf with the frame’s leaf, insert the hinge pin, and test the door swing. It should open/close smoothly without sticking. For fire safety, verify the door latches tightly with your door lockset and closes fully with a door closer.

Application Scenarios

This UL fire rated square corner heavy duty hinge is designed for environments requiring strength, fire safety, and durability. Key application scenarios include:

• Commercial Buildings: Office stairwells, mall entryways, and warehouse fire doors—supports heavy doors and pairs with panic exit devices for emergency egress.
• Hospitality & Residential: Hotels, villas, and high-rise apartments—finishes like AB/AC complement traditional decor, while SUS304/SUS316 options resist moisture in bathrooms/kitchens.
• Public Facilities: Hospitals, schools, and community halls—heavy-duty construction withstands frequent use, and UL certification meets public safety standards.
• Outdoor & Industrial: Outdoor gates, basement doors, and factory corridors—SUS316 option resists industrial fumes and weather exposure, while square corners ensure stable gate operation.

Value for Buyers: Choosing this hinge eliminates fire code violations, reduces maintenance costs (via 5-year warranty and durable design), and simplifies inventory (multi-material/finish options cover diverse projects). For distributors, its heavy-duty versatility expands market reach—from residential renovations to large-scale commercial projects—while UL certification builds trust with safety-focused clients.

Certifications and Compliance

• UL10C Fire Rating: Officially certified to UL10C standards (UL File No. R38013) for 3-hour fire resistance, meeting ANSI/BHMA A156.2 standards for heavy-duty door hinges.
• ISO 9001 Compliance: Manufactured under D&D’s ISO 9001-certified quality management system, ensuring consistent quality across every unit—critical for large projects like hotel renovations and school expansions.
• Global Fire Codes: Adheres to regional safety regulations,suitable for export to 60+ countries.
• SGS Factory Audited: Produced in an SGS-audited facility, verifying ethical manufacturing practices, reliable production capacity, and compliance with international labor standards.
• Corrosion Resistance Testing: SUS304/SUS316 variants pass 240-hour salt spray tests to ensure durability in harsh environments.

Customization Options

To meet diverse project needs, D&D offers flexible customization for the DDSS008-FR hinge:

• Material Customization: Upgrade/downgrade stainless steel grades (SUS201/SUS304/SUS316) based on budget and environment (e.g., SUS316 for coastal hotels, SUS201 for dry office spaces).
• Finish Customization: Add custom finishes (e.g., matte black PVD, brushed brass) to match specific design requirements (e.g., luxury hotels pairing with gold door handles).
• Size Modifications: Adjust dimensions (length, width, thickness) for extra-thick doors (e.g., 3" solid oak entry doors) or specialized applications (e.g., industrial machine room doors).
• Bearing Upgrades: Add self-lubricating bearings for maintenance-free operation in hard-to-reach areas (e.g., high ceiling warehouse doors).
• Packaging Customization: Opt for branded white boxes, color boxes, or bulk cartons with your logo—ideal for private-label projects or retail distribution (e.g., hardware stores).
• OEM/ODM Services: Collaborate with our engineering team for custom designs (e.g., extended hinge leaves for oversized doors) or private-label branding—supported by 3D model design to align with project specifications.

Production Process & Quality Control

D&D’s production process ensures every UL fire rated square corner heavy duty hinge meets the highest safety and quality standards. Key steps include:

1. Material Sourcing & Testing: Select SUS201/SUS304/SUS316 stainless steel and test for purity via spectroscopic analysis—ensuring compliance with fire-resistance and corrosion standards.
2. Precision Machining: Use CNC machines to cut hinge components (leaves, knuckles, square corners) to exact tolerances (±0.01mm). Four ball bearing grooves are milled to ensure smooth integration.
3. Heat Treatment: Harden hinge components at 1080°C in a controlled atmosphere furnace to enhance strength—critical for withstanding UL10C’s 3-hour fire test and 200lbs load capacity.
4. Surface Finishing: Apply finishes via electroplating (AB/AC), polishing (PSS), or PVD coating. Each hinge undergoes a finish adhesion test to ensure resistance to scratching and fading.
5. Performance Testing: Sample hinges are subjected to UL10C fire testing (3 hours at 1700°F), load-bearing tests (200lbs for 150,000 cycles), and corrosion testing (240-hour salt spray)—only passing samples proceed to mass production.
6. Final QC Inspection: A dedicated team inspects every hinge for dimensional accuracy, finish quality, and mechanical functionality. UL certification labels are applied only to hinges that meet all standards, then packaged for shipment.

Packaging & Logistics

• Packaging Options: Available in white boxes (1 piece per box) or carton packing (20 pieces per carton). Custom packaging (branded, project-specific) is available for bulk orders (1,000+ pieces).
• Selling Units: Sold per piece; bulk orders qualify for volume pricing and flexible delivery schedules (critical for time-sensitive projects like hospital expansions).
• Transportation Modes: Ocean, land, air, or express shipping—choose based on timeline (e.g., express for urgent repairs, ocean for cost-efficient bulk shipments to global distributors).
• Port Options: Ships from Jiangmen, Guangzhou, or Shenzhen ports—strategically located for fast access to global shipping routes (reduces transit time to Europe, Americas, and Southeast Asia).
• Incoterms: FOB, Express Delivery, CFR, CIF, EXW, FCA, DDP, DDU—select terms that align with your import policies (e.g., DDP for door-to-door delivery to construction sites).
• Payment Terms: L/C (Letter of Credit) or T/T (Telegraphic Transfer)—secure options for international transactions, with flexible terms (e.g., 30% advance, 70% balance before shipment) for long-term partners.