Safe Stainless Steel Door Hinge fire rated

UL Listed Fire Rated 2BB Full Mortise Hinge - DDSS001-FR

Product Overview

As a core part of D&D HARDWARE’s premium door hardware lineup, the UL Listed Fire Rated 2BB Full Mortise Hinge (Model: DDSS001-FR) is engineered to deliver unmatched safety, durability, and performance for fire doors in commercial and residential buildings. This hinge has successfully passed rigorous testing and certification by Underwriters Laboratories (UL), achieving a 3-hour fire rating—meeting the strictest global fire safety standards to slow fire spread and protect lives.

The "2BB" designation signifies two integrated ball bearings, which ensure ultra-smooth door operation and extend the hinge’s service life even with frequent use. Designed as a full mortise hinge (installed by recessing into the door and frame), it provides a seamless, secure fit that complements various door handles and door locksets. As a professional door hinges manufacturer with over 18 years of experience, D&D ensures this product integrates perfectly with our door closers and panic exit devices, forming a complete fire-safe door system.

Product Images and Videos

Technical Specifications

• Model Number: DDSS001-FR
• Brand: D&D HARDWARE
• Type: 2BB Full Mortise Hinge (2 ball bearings)
• Fire Rating: UL Listed 3 Hours Fire-Rated
• Material: Premium stainless steel (SUS304 as standard; SUS316 available for enhanced corrosion resistance)
• Dimensions: 4.0"x3.0"x3.0mm, 4.0"x3.5"x3.0mm, 4.0"x4.0"x3.0mm, 4.0"x4.0"x3.4mm (length x width x thickness)
• Design Style: Compatible with Modern, Industrial, and Contemporary 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

• UL 3-Hour Fire Safety Assurance: Undergoes UL’s rigorous fire testing to maintain structural integrity for 3 hours, ensuring compliance with global building codes and protecting against fire hazards—critical for high-risk areas like hospitals and schools.
• 2BB Ball Bearing Design: Two integrated ball bearings reduce friction between hinge components, enabling smooth door swings (even for heavy fire doors) and minimizing wear. This design extends the hinge’s lifespan by 50% compared to non-ball-bearing hinges.
• Full Mortise Installation: Recesses into the door and frame for a flush, secure fit that prevents tampering and enhances door stability. This design also complements the clean look of modern door handles and door knobs.
• Premium Stainless Steel Durability: Made with SUS304/SUS316 stainless steel to resist rust, corrosion, and deformation—suitable for humid environments like bathrooms or outdoor covered areas. It maintains performance even with daily heavy use.
• Seamless System Compatibility: Works in perfect harmony with D&D’s door closers, panic exit devices, and door seals to create a unified fire-safe door system. This eliminates compatibility issues and simplifies procurement for buyers.
• Versatile Size Options: Four standard size variants meet the needs of different door thicknesses and weights, reducing the need for custom modifications and speeding up installation.

How to Install the UL Listed 2BB Full Mortise Hinge (Step-by-Step)

1. Prepare Tools & Materials: Gather a mortise chisel, hammer, drill, screwdriver, measuring tape, pencil, and the DDSS001-FR hinge (ensure screws and hinge pins are included). For fire doors, pair with D&D’s door seals for full compliance.
2. Mark Mortise Locations: On the door edge and corresponding frame, measure and mark the hinge position (typically 7" from the top, 11" from the bottom, and centered for 3-hinge setups). Mark the mortise depth (matching the hinge leaf thickness).
3. Cut Mortises: Use the mortise chisel and hammer to carve recesses (mortises) into the door and frame, ensuring the depth is precise—hinge leaves must sit flush with the surface once installed.
4. Secure Hinge Leaves: Place one hinge leaf into the frame mortise, drill pilot holes, and fasten with screws. Repeat to attach the other leaf to the door mortise. Ensure leaves are aligned to avoid binding.
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. Verify the hinge pairs with your door closer for controlled movement.

Application Scenarios

This UL Listed 2BB Full Mortise Hinge is designed for fire doors in environments where safety, durability, and code compliance are critical. Key application scenarios include:

• Commercial Buildings: Offices, malls, and warehouses—paired with panic exit devices for emergency egress and door closers for automatic door control.
• Public Facilities: Hospitals and schools—resists heavy use, meets health/safety standards, and ensures fire compliance to protect occupants.
• Residential Spaces: Villas, apartments, and farmhouses—ideal for entry doors, bedrooms, and bathrooms (corrosion-resistant finish suits humid conditions).
• Outdoor & Semi-Outdoor Areas: Courtyards and covered entryways—stainless steel construction withstands weather exposure without rusting.

Value for Buyers: Choosing this hinge eliminates costly code violations, reduces maintenance costs (via 5-year warranty), and streamlines project timelines (compatible with D&D’s full door hardware range). It also enhances your end-product’s safety reputation, making your projects more competitive in global markets.

Certifications and Compliance

• UL Listing: Officially UL Listed with a 3-hour fire rating, meeting ANSI/BHMA standards for fire door components—recognized in North America, Europe, and Asia.
• ISO 9001 Compliance: Manufactured under D&D’s ISO 9001-certified quality management system, ensuring consistent performance and quality across every unit.
• Global Building Codes: Adheres to fire safety regulations in the U.S. (NFPA), EU (EN 1634), and Middle East (SASO)—suitable for export to 60+ countries D&D serves.
• SGS Factory Audited: Produced in an SGS-audited facility, verifying ethical manufacturing practices and reliable production capabilities.

Customization Options

To meet diverse project needs, D&D offers flexible customization for the DDSS001-FR hinge:

• Material Upgrades: Upgrade from SUS304 to SUS316 stainless steel for enhanced corrosion resistance (ideal for coastal areas or high-moisture environments like swimming pool facilities).
• Finish Customization: Choose from finishes like satin nickel, black, or polished chrome to match your door handles, door knobs, or door locksets.
• Size Modifications: Adjust dimensions beyond standard options (e.g., thicker gauge for extra-heavy fire doors) based on your specific door weight and thickness.
• Packaging Customization: Opt for branded white boxes, color boxes, or bulk cartons with your logo—ideal for private-label projects or retail distribution.
• OEM/ODM Services: Collaborate with our engineering team for custom hinge designs (e.g., modified ball bearing placement) or private-label branding—supported by 3D model design and graphic design services.

Production Process & Quality Control

D&D’s production process ensures every UL Listed 2BB Full Mortise Hinge meets the highest safety and quality standards. Key steps include:

1. Material Sourcing: Select high-grade SUS304/SUS316 stainless steel and test for purity to avoid defects that could compromise fire resistance.
2. Precision Machining: Use CNC machines to cut hinge components (leaves, knuckles, ball bearings) to exact specifications—ensuring 2BB ball bearings fit perfectly for smooth operation.
3. Mortise Groove Formation: Specialized tools carve precise mortise grooves into hinge leaves, ensuring seamless installation into doors and frames.
4. Heat Treatment: Harden hinge components at controlled temperatures to enhance strength and fire resistance—critical for meeting UL’s 3-hour rating.
5. Surface Finishing: Apply corrosion-resistant finishes (e.g., satin nickel) and test for adhesion to ensure long-term durability.
6. Fire & Performance Testing: Sample hinges undergo UL’s 3-hour fire test and load-bearing tests (up to 200lbs) to verify compliance. Ball bearing operation is tested for 100,000 cycles to ensure smoothness.
7. Final QC Inspection: Each hinge is inspected for dimensional accuracy, finish quality, and fire-rated components—only passing units are packaged for shipment.

Packaging & Logistics

• Packaging Options: Available in white boxes, color boxes, or carton packing—custom packaging with your branding is available upon request.
• Selling Units: Sold per piece; bulk orders (1,000+ pieces) qualify for volume pricing.
• Transportation Modes: Flexible options including ocean, land, air, and express shipping—choose based on your timeline and budget.
• Port Options: Ships from Jiangmen, Guangzhou, or Shenzhen ports—closest to our factory for cost-efficient and fast delivery.
• Incoterms: FOB, CFR, CIF, EXW, DDP, DDU, FCA, Express Delivery—select terms that align with your import requirements.
• Payment Terms: L/C (Letter of Credit) or T/T (Telegraphic Transfer)—secure payment options for international transactions.

After-Sales Support

• Warranty Service: 5-year mechanical warranty—covers manufacturing defects and performance issues. We replace or repair defective units free of charge.
• Online Technical Support: Our team provides 24/7 online support for installation guidance, troubleshooting, and compatibility questions (e.g., pairing with door closers or locksets).
• Engineering Solutions: Access to graphic design and 3D model design services to support project planning and integration with your door systems.
• Certification Documentation: We provide digital copies of UL certificates, ISO 9001 documents, and test reports for customs clearance and project compliance.