Door Hinge 4", Full-Mortise, Steel, Satin Brass, National Hardware N830-225 (6-PACK) The National Hardware N830-225 4-inch full-mortise door hinge is a heavy-duty, satin brass-finished hinge engineered for smooth, long-lasting performance on interior residential doors. Constructed from heavy-gauge cold-rolled steel with a corrosion-resistant satin brass plating, it delivers superior strength and enduring aesthetics for high-traffic applications. The five-knuckle full-mortise design ensures even weight distribution and stable door alignment, while the 5/8-inch radius round corners provide a refined, flush fit within standard door and frame mortises. A non-rising, removable pin simplifies installation and removal without requiring complete disassembly, and all eight screw holes are precision countersunk for a clean, flush mount with no protruding heads. Features - Heavy-gauge cold-rolled steel construction resists bending, warping, and fatigue under repeated use - Satin brass finish offers elegant, low-luster appearance that resists tarnishing and fingerprints - Five-knuckle full-mortise design distributes weight evenly for smooth, quiet operation - 5/8-inch radius rounded corners ensure seamless fit in standard mortise cutouts - Non-rising, removable pin allows easy door removal for painting, cleaning, or replacement ? no disassembly of hinges required - Eight countersunk screw holes for secure, flush mounting with standard wood screws (included) - Rated for 50?55 lb door weight capacity ? ideal for standard interior doors up to 1-3/4 in thickness - No spring mechanism or self-closing feature ? designed for manual, controlled operation - Corrosion-resistant plating suitable for indoor environments including bathrooms and kitchens - Compatible with most standard interior door applications ? residential homes, apartments, offices Specifications - Brand Name: National Hardware - Model Name: National Hardware N830-225 - Product Type: Door Hinge - Material: Steel with Satin Brass Finish - Finish: Satin Brass - Hinge Type: Full Mortise - Length: 4 in - Height: 0.50 in - Width: 5.00 in (overall profile) - Corner Radius: 5/8 in - Number of Knuckles: 5 - Number of Mounting Holes: 8 - Pin Type: Non-Rising, Removable - Self-Closing: No - Spring Return: No - Weight Capacity: 50 lb (safe working load: 55 lb) - Mounting Type: Full-Mortise - Hardware Included: Yes (wood screws) - Each Weight: 0.505 lb - Packaging: Bagged - Country of Origin: China - UPC: 886780009651 - GTIN: 00886780009651 - ECCN: EAR99 - Nomenclature: N830225 HINGE DR 4" RC S BR - Manufacturer: National Mfg Sales Co. Product Application The National Hardware N830-225 satin brass hinge is used by cabinetmakers, homebuilders, and remodeling contractors installing interior doors in residential homes, apartments, and light commercial spaces. Ideal for bedroom, bathroom, closet, and entry doors, it delivers both functional reliability and refined visual appeal ? blending seamlessly with brass hardware, trim, and fixtures for a cohesive, high-end look. Its removable pin and full-mortise design make it ideal for both new construction and retrofit applications, allowing for easy door removal during finishing or maintenance. Professionals and homeowners choose it for its durability, smooth operation, and timeless finish ? delivering the quiet confidence that doors will hang true, close quietly, and maintain their beauty for years.