Hinge Supplier UL SUS304 Full Mortise Fire Door Hinges Types internal-DDSS001-FR-4X3.5X3

Hinge Supplier UL SUS304 Full Mortise Fire Door Hinges Types internal-DDSS001-FR-4X3.5X3

As a specialist manufacturer of door hinges, we supply UL-certified SUS304 mortise fire-rated door hinges specifically engineered for interior door systems. This door hinges internal product holds dual UL/cUL certification under file number R38013, complying with UL 10C standards and achieving a 3-hour fire rating. Crafted from premium SUS304 stainless steel, it delivers reliable fire safety assurance within indoor environments. We prioritise the structural integrity and longevity of our internal door hinges. Each product undergoes rigorous quality inspection to guarantee suitability for diverse interior door applications. Designed with specific installation requirements and usage characteristics in mind, this internal door hinge solution delivers stable performance and dependable safety for purchasers. For further information, please contact us.

Product Overview

Packaging & Shipping

Specifications

Certification and standard: the product has passed the UL/cUL certification, which meets the requirements of UL 10C standard, and the fire protection level reaches 3 hours. The authentication document number R38013 can be inquired and verified in UL official website. At the same time, the products meet the ANSI/BHMA A156.1 Grade 1 standard to ensure high performance and reliability. All authentication documents are provided with the goods, which is convenient for buyers to check and accept.

Material and technology: made of SUS304 stainless steel, with 8-10.5% nickel and 18-20% chromium. The precision stamping process is adopted, and the dimensional tolerance is controlled within ±0.1mm to ensure the consistency of product quality.

Size and performance: the standard size is 4 inches ×3.5 inches, and the thickness is 3.0mm. Pin design, groove depth of 12mm, strong load-bearing capacity. The surface is treated with satin stainless steel, which is suitable for various indoor environments.

Product Features

High-quality material guarantee: this door hinges internal is made of SUS304 stainless steel, and its nickel and chromium content is better than that of ordinary stainless steel, and its corrosion resistance is improved by 40%. Especially suitable for indoor humid environment, such as bathrooms, kitchens and other places, to ensure that long-term use does not rust.

Precision structure design: adopt full-bolt structure, and the gap between bolt and shaft sleeve is controlled within 0.1mm to ensure smooth operation. After opening and closing test, there is no wear, and the service life far exceeds the industry standard.

Convenient installation and maintenance: Modular design reduces installation time by 40%. All accessories can be replaced separately, reducing maintenance costs. Clear installation instruction marks improve the installation accuracy by 50%, and even non-professionals can complete the installation quickly.

Application Scenarios

High-end Residential Projects: This door hinges internal is ideally suited for interior door systems in premium residences. Its elegant satin finish seamlessly integrates with contemporary home décor, while fire-resistant properties provide occupants with enhanced safety. The silent operation ensures a tranquil and comfortable living environment.

Office Building Partitioning: Fire-rated doors in commercial environments require reliable internal door hinges. Certified for three-hour fire resistance, this product ensures secure compartmentalisation within office spaces. Its durable construction withstands high-frequency daily use, minimising maintenance requirements.

Hotel Room Systems: Hotel interior doors demand both aesthetics and functionality. The contemporary design of these internal door hinges elevates room standards, while silent operation ensures undisturbed guest rest. Fire-resistant properties comply with hotel safety regulations.

Installation Guidelines

Pre-installation checks: Verify door leaf and frame thicknesses meet installation requirements for these internal door hinges. Confirm pre-cut slot dimensions match specifications, using specialised templates to mark installation positions. Prepare appropriate installation tools and accessories.

Precise Slot Positioning: Employ professional slot-cutting tools to achieve a depth of 12±0.2mm with vertical, smooth walls. Clean the slot area, removing wood shavings and debris to ensure a clean, flat mounting surface.

Hinge Installation: First install the frame-side hinges, securing them with the supplied screws. When fitting the door-side hinges, ensure perfect alignment with the frame. Use a spirit level to verify installation accuracy, confirming all internal door hinges lie on the same horizontal plane.

Adjustment and Testing: Conduct opening/closing tests post-installation to verify smooth operation. Adjust hinge tension for seamless door closure. Test fire-sealing performance to confirm compliance with safety standards.

Final Acceptance: Perform comprehensive checks to confirm all screws are securely fastened. Complete the installation record form and provide usage/maintenance instructions. Ensure users understand product features and precautions.

Value Proposition

Cost Reduction: Premium internal door hinges minimise replacement frequency, lowering maintenance expenses. Extended service life reduces total cost of ownership by 30%, delivering significant economic benefits to purchasers.

Efficiency Enhancement: Standardised design shortens installation time by 40%, accelerating project schedules. Modular construction simplifies maintenance procedures, reducing labour costs and boosting overall operational efficiency.

Quality Enhancement: UL-certified internal door hinges elevate the product's overall quality rating. Superior performance enhances user experience, elevating project quality perception and market competitiveness.

Supply Assurance: As the manufacturer, we guarantee consistent product quality and reliable supply capacity. A comprehensive after-sales service system provides purchasers with end-to-end technical support, mitigating project risks.