Adjustable Spring Hinge, 3-1/2 Inches, 5/8" Radius Corner, Satin Nickel by Stone Harbor Hardware Upgrade your door functionality with the Stone Harbor Hardware Adjustable Spring Hinge, a premium-quality, 3-1/2-inch door mount hinge designed for durability, precision, and seamless integration into both residential and commercial spaces. Featuring a 5/8-inch radius corner and a sleek satin nickel finish, this spring hinge combines modern aesthetics with robust performance, making it ideal for use on fire-rated doors, hotel room entrances, apartment interior doors, and other high-traffic applications. Crafted from heavy-duty steel, the hinge is built to withstand repeated use while maintaining smooth operation and reliable self-closing action. Engineered to meet strict safety standards, this UL-rated spring hinge complies with the NFPA80 standard for 3-hour fire doors, making it a trusted choice for code-compliant installations. While a single hinge can enhance performance, a minimum of two UL-rated spring hinges are required per fire door to meet full compliance. The adjustable tension design allows for customized door closing speed, eliminating slams and ensuring quiet, controlled closure every time. Whether you're replacing outdated hardware or installing in a new build, this hinge delivers both form and function without the need for bulky overhead closers. Measuring 3.5 inches in length and width, the compact yet sturdy design fits standard door cutouts with ease. The satin nickel finish not only resists corrosion and wear but also coordinates perfectly with other Stone Harbor Hardware products, ensuring a consistent, polished look across all fixtures. Installation is simple and efficient ? all necessary mounting hardware is included, featuring #10 x 1? wood screws and 1/2? machine screws, so no additional components are required. The package arrives ready to install, saving time and effort on the job site. Features - Adjustable spring tension for customizable door closing speed - Designed for use on fire doors, hotel doors, and apartment interior doors - UL rated and meets NFPA80 standard for 3-hour fire door compliance (minimum two hinges required per door) - Durable steel construction ensures long-term reliability and performance - 3-1/2 inches x 3-1/2 inches size with 5/8-inch radius corners for a clean, modern fit - Satin nickel finish resists corrosion and matches other Stone Harbor Hardware products - Includes all mounting hardware: #10 x 1? wood screws and 1/2? machine screws - Door mount type for easy installation on standard door frames - Sold individually for flexible purchasing and replacement - Ideal alternative to bulky overhead door closers Specifications - Brand Name: Stone Harbor Hardware - Product Type: Spring Hinge - Finish Type: Satin Nickel - Primary Material: Steel - Color: Nickel - Mounting Type: Door Mount - Hinge Size: 3.5 inches - Corner Radius: 5/8 inch - Product Dimensions: 3.5 inches L x 3.5 inches W - Item Weight: 0.63 lbs - Package Dimensions: 4.9 inches L x 2.6 inches W x 1 inch H - Number of Items: 1 - Unit Count: 1.0 Count - Suggested Users: Unisex-Adult - Manufacturer: Stone Harbor Hardware Product Application The Stone Harbor Hardware Adjustable Spring Hinge is an intelligent, space-saving solution for doors requiring automatic closure without the need for overhead mechanisms. Its precision engineering and UL/NFPA80 compliance make it especially suitable for use in multi-family housing, hotels, office buildings, and other settings where fire safety and consistent performance are essential. The adjustable spring mechanism allows installers to fine-tune the closing force, adapting to door weight and usage patterns. With its high-quality satin nickel finish and durable build, this hinge not only performs reliably but also enhances the visual appeal of any door it's installed on. Whether used for new construction or renovation projects, this spring hinge offers a professional-grade upgrade that combines safety, convenience, and lasting value.