{"product_id":"national-marker-n830403-square-door-hinge-4-in-satin-brass-3-pack","title":"National Marker N830403 Square Door Hinge 4 in Satin Brass 3-pack","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe NATIONAL MARKER N830403 is a 4-inch square corner door hinge finished in satin brass, sold in a 3-pack. Built from heavy-gauge cold-rolled steel, this full mortise hinge delivers structural strength suited to residential and light commercial door installations. The 5-knuckle design provides smooth, stable operation across the full arc of door swing. Countersunk screw holes allow fasteners to sit flush with the hinge leaf, and a removable pin simplifies door hanging and removal without disturbing the frame-side leaf. Licensed trade carpenters, finish contractors, and maintenance technicians are the primary installers.\u003c\/p\u003e\u003cp\u003eThis hinge is designed for standard interior and exterior door applications requiring a 4-inch square corner, full mortise hinge. The satin brass finish suits residential entry doors, interior passage doors, and light commercial doors where a clean, finished appearance is required. The 3-pack format is practical for single-door installations, which typically require 3 hinges per door leaf.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eHeavy-gauge cold-rolled steel construction for added load strength\u003c\/li\u003e\n\u003cli\u003eFull mortise, 5-knuckle design for smooth and stable door swing\u003c\/li\u003e\n\u003cli\u003eSquare corners for compatibility with standard mortise router templates\u003c\/li\u003e\n\u003cli\u003eCountersunk screw holes allow flush fastener seating\u003c\/li\u003e\n\u003cli\u003eRemovable pin simplifies door installation and removal\u003c\/li\u003e\n\u003cli\u003eSatin brass finish provides a clean appearance on finished doors\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or new-installation hinge for standard 4-inch full mortise square corner door applications in residential and light commercial construction.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by finish carpenters or licensed contractors using a router or chisel to cut the mortise pocket in both the door edge and the door frame. Ensure the door is fully supported and blocked during hinge installation to prevent movement. Countersink pilot holes before driving screws to avoid splitting the door stile or frame. The removable pin allows the door to be lifted free of the frame without removing the hinge leaves from either surface.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHinge Size\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorner Style\u003c\/strong\u003e: Square\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKnuckle Count\u003c\/strong\u003e: 5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHinge Type\u003c\/strong\u003e: Full Mortise\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Heavy-gauge cold-rolled steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Satin Brass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePin Type\u003c\/strong\u003e: Removable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 3-pack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Weight\u003c\/strong\u003e: 1.714 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: NATIONAL MARKER\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: N830403\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"NATIONAL MARKER","offers":[{"title":"Default Title","offer_id":51343028158770,"sku":"N830403","price":26.17,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/310550686.jpg?v=1782014305","url":"https:\/\/voomisupply.com\/products\/national-marker-n830403-square-door-hinge-4-in-satin-brass-3-pack","provider":"Voomi Supply","version":"1.0","type":"link"}