UL Listed SS201 Fire Rated Butt Hinge Manufacturer for Interior Door-DDSS001-FR-4X3.5X3

Technical Specifications

1. Model and Certification: This product model is DDSS001-FR. Its most critical qualification is dual UL/cUL certification, having rigorously passed UL 10C standard testing to achieve a 3-hour fire rating. This official certification serves as the key basis for purchasers to assess whether the product meets project entry thresholds and local fire regulations, providing ironclad proof of your project's compliance.

2. Dimensions and Materials: The product features precise dimensions of 4 inches x 3.5 inches (approximately 102mm x 89mm), with a leaf thickness of 3.0mm, ensuring robustness and load-bearing capacity. The primary material is SS201 stainless steel, offering an excellent balance of strength, malleability, and corrosion resistance. This makes it highly suitable for manufacturing fire door hinges subjected to high usage frequency, guaranteeing long-term stability.

3. Surface Finish and Details: The surface undergoes SSS (Stainless Steel Smooth) processing, involving polishing of the stainless steel body. This not only imparts a clean, contemporary appearance that seamlessly integrates with door panels and frames, but crucially, the smooth surface effectively minimises dust and contaminant accumulation, facilitates easy cleaning, and further enhances corrosion resistance and wear resilience.

Product Features 

1. Authoritative Certification, Safety and Reliability: The core strength of this UL Listed Hinge lies in its indisputable certification credentials. We are not merely manufacturers but guardians of quality. Each hinge is rigorously produced and tested according to the UL 10C standard protocol, ensuring structural integrity and functionality even under extreme high-temperature conditions. This fundamentally distinguishes it from many uncertified or ambiguously certified products, providing purchasers with legally binding safety assurance for their projects and eliminating potential concerns.

2. Premium Materials, Exceptional Durability: We eschew ordinary carbon steel, opting instead for SS201 stainless steel as our raw material. Compared to the cheaper alternatives competitors may employ, our hinges possess inherent rust and corrosion resistance. This significantly extends product lifespan while minimising issues like sagging doors, squeaking, or sticking caused by hinge corrosion. This translates to a more enduring and stable user experience for your end customers, substantially lowering long-term maintenance costs.

3. Precision Engineering, Superior Performance: As a specialist manufacturer, we pursue excellence in craftsmanship. The hinge's bearing system undergoes precise calculation and machining, ensuring smooth, silent door operation without noise. High-precision machining guarantees a perfect fit upon installation, preventing unnecessary friction or gaps between door leaf and frame. This dedication to detail ensures the fire door's overall seal integrity and smoke containment performance, underscoring our commitment to uncompromising product quality.

How to Use & Install

Step 1: Inspection and preparation: Before installation, please first confirm that the received product model DDSS001-FR is consistent with the order, and check whether there is UL certification mark. Counting the required quantity, usually 3-4 hinges need to be installed on each door. Prepare installation tools, including screwdriver, electric drill, matching screws (usually self-provided) and spirit level. Ensure that the dimensions of the door leaf and the door frame of the fire door match, and the position of the pre-slot is consistent with the size of the hinge blade, which is the basis for ensuring smooth installation.

Step 2: Positioning and fixing: Put the hinge blades into the pre-slots of the door sash and the door frame respectively. Using a spirit level to ensure that the hinge axis is completely vertical is very important for whether the door leaf can be opened and closed naturally and straightly. First, preliminarily fix a few screws with a manual screwdriver to ensure the correct position. The accuracy of this step directly affects the final use effect and aesthetics of the door body, so be sure to proofread it carefully.

Step 3: Final fastening and debugging: After confirming that all hinges are located accurately and the door leaf switch is smooth, use an electric drill to tighten all screws thoroughly to ensure that the hinges are closely attached to the wood or metal frame without any looseness. After installation, repeatedly open and close the door leaf several times to check whether it runs smoothly, without jamming and noise. This UL Listed Hinge is designed to provide stable and reliable performance, and the correct installation can maximize its performance.

Step 4: Final inspection: After the installation, the final inspection shall be carried out. Make sure that the gap between the door leaf and the door frame is even and meets the requirements of the fire sealing strip when the door leaf is properly closed. Remind the end user that it is strictly forbidden to disassemble or replace any parts on the hinge without permission, otherwise it may affect its fire rating and safety. This hinge is specially designed for fire doors. It does not need special maintenance, so it can be kept clean.

Value Proposition

1. Improve the project quality and brand reputation: purchasing our UL Listed Hinge with official endorsement can directly improve the safety and quality level of the fire doors or the whole building project you produce. You can take UL certification as the core selling point of your products and show your customers (such as developers and construction companies) that you attach great importance to safety and compliance commitment. This greatly enhances your brand professionalism and market reputation, helps you stand out in the bidding, wins the trust of more high-end projects and customers, and thus creates higher commercial value.

2. Ensure the stability of the supply chain and reduce the comprehensive cost: As a direct manufacturer, we can provide stable production capacity and competitive prices, ensure that you can obtain continuous and reliable supply, and avoid project risks caused by supply chain interruption. At the same time, this hinge has excellent durability and low failure rate, which can significantly reduce the future after-sales maintenance problems and related costs of your products. Purchase once and benefit for life, which not only reduces your comprehensive cost of ownership, but also saves you precious time and energy, so that you can concentrate more on the development of your core business.

UL Listed Hinge