cUL Listed 4 Inch Double Ball Bearing Stainless Steel Canada Door Hinges-DDSS001-FR-4X3.5X3.0

Welcome to our cUL certified 4 inch stainless steel fire door hinge with double ball bearings, which is specially designed for the Canadian market. As a professional manufacturer of Fire Door Hinges, we deeply understand the strict requirements of the North American market for building safety accessories. This product has been strictly certified by cUL, conforms to UL 10C standard, and provides fire protection for up to 3 hours, so as to effectively prevent the fire from spreading in case of fire. The product is made of all 304 stainless steel and equipped with precision double ball bearing system, which not only has excellent fire resistance, but also ensures the smooth and silent opening experience of the door leaf. These Fire Door Hinges have been specially treated for corrosion protection, which can maintain excellent performance even in high humidity or cold environment. As a direct manufacturer, we can ensure the consistency of product quality and the stability of supply, and at the same time provide competitive prices. Choosing our Fire Door Hinges is to choose reliable safety guarantee and market access qualification for your fire door project. For further information, please contact us.

Product Overview

Packaging & Shipping

Certification and Standards: This product holds cUL certification, conforming to the Canadian standard CAN/ULC-S104 with a fire rating of 3 hours. It simultaneously meets the requirements of the UL 10C American standard, achieving dual compliance for the North American market. The certification number can be verified on the UL official website, ensuring purchasers receive fully compliant products.

Material and Process: Manufactured from 304 stainless steel with a nickel content exceeding 8%, delivering exceptional corrosion resistance. Precision-stamped and stress-relieved to ensure long-term dimensional stability. All raw materials are traceable, guaranteeing consistent quality.

Dimensions and Specifications: Standard 4-inch (101.6mm) × 4-inch dimensions, 3.5mm thickness. Reinforced bearing design enables load capacity up to 100kg per unit. 10mm diameter pins ensure stable support for heavy-duty door panels.

Surface Finish: Satin stainless steel treatment achieves surface roughness Ra0.4μm. This finish enhances aesthetics while effectively preventing fingerprint retention and improving corrosion resistance.

Operating Environment: Suitable for temperatures ranging from -40°C to 200°C, accommodating Canada's diverse climatic conditions. Withstands 2000 hours of salt spray testing, making it ideal for coastal regions. Compatible with both timber and steel fire doors, featuring installation holes conforming to North American standards.

Dual Certification Assurance: These Fire Door Hinges hold both cUL and UL certifications, serving as essential credentials for accessing the North American market. Compared to products with single certification, our hinges enable buyers to access both US and Canadian markets simultaneously, significantly expanding market opportunities. Each hinge bears engraved certification marks for full traceability.

Superior Bearing System: Features precision dual ball bearings, each preloaded for smooth operation. Compared to traditional single-bearing designs, the dual-bearing structure extends service life by over three times, making it particularly suitable for high-traffic commercial environments. Sealed bearings prevent dust ingress, further extending maintenance intervals.

Comprehensive Quality Assurance: We implement end-to-end quality control from raw materials to finished products. Every batch undergoes 100% opening/closing tests, salt spray tests, and load-bearing tests. We offer a five-year warranty, significantly exceeding the industry standard of two years. This quality commitment provides purchasers with peace of mind and minimises after-sales issues.

Pre-installation preparation: Verify that the door leaf and frame dimensions are compatible. Check that the pre-cut mortise depth and size match the Fire Door Hinges specifications. Prepare installation tools, including a spirit level, electric drill, screwdriver, and matching stainless steel screws. We recommend using our dedicated installation screws to ensure optimal performance.

Precise Positioning: Determine the number of hinges required based on door weight, typically 3-4 Fire Door Hinges per door. Use a spirit level to ensure all mounting points align vertically. Position the top hinge 15cm from the door top, the bottom hinge 20cm from the door bottom, with intermediate hinges evenly spaced. Mark drilling positions accurately.

Fitting Hinge Leaves: Secure each hinge leaf separately to the door leaf and frame, utilising all mounting holes for stability. Ensure bearing holes face correctly and all hinges open in the same direction. Begin installation from the top for easier adjustment.

Hanging the Door Leaf: Lift the door leaf and align the hinges on the door leaf with those on the frame. Insert the top pin first, followed sequentially by the remaining pins. Maintain the door leaf's balance during insertion to prevent damage to the hinge bearings.

Adjustment and Testing: Verify the door leaf is vertical and operates smoothly. Fine-tune the door leaf's position by adjusting the tension of the fine-adjustment screws. Test the door leaf's holding performance at any position to ensure it does not swing open or shut unassisted.

Final Inspection: Confirm all screws are securely fastened and conduct multiple opening/closing tests. Verify the seal integrity when the door is closed, ensuring the fire seal is uniformly compressed. Advise the user on key maintenance points, including regular checks of screw tightness.

Reduce compliance risks: Our Fire Door Hinges provide complete certification documents to help buyers easily pass building acceptance and avoid project delays or fines caused by product certification issues. This saves the purchaser a lot of time and potential legal costs, ensuring the smooth progress of the project.

Enhancing product competitiveness: Using high-quality Fire Door Hinges can significantly improve the market competitiveness of buyers' final products. Excellent user experience and reliable security performance have become important selling points, helping buyers obtain more orders in the high-end market and achieve product premium.

Reduce after-sales costs: The excellent durability and reliability of the product can significantly reduce after-sales maintenance costs. The 10-year warranty period reduces the worries of buyers, and the low failure rate under long-term use also saves buyers a lot of labor costs and maintenance expenses.