Soss 218US4 Heavy Duty Invisible Hinge Satin Brass

Product Description

The SOSS 218US4 is a heavy-duty invisible hinge designed for 1-3/4 inch doors in both residential and light commercial applications. When the door is closed, the hinge is completely concealed within the door and jamb, leaving a clean, uninterrupted surface with no exposed hardware. The 218US4 measures 1-1/8 inches in width and 4-5/8 inches in length and ships in a satin brass finish. At 2.05 pounds, it is built for durability in high-use door installations. Carpenters, millwork specialists, and finish contractors are the primary tradespeople who specify and install this type of hinge.

This hinge is suited for interior and exterior door applications where a clean architectural appearance is required. It is commonly used in high-end residential builds, hospitality projects, and commercial interiors where exposed butt hinges are not acceptable. The satin brass finish coordinates with matching door hardware in warm-toned or traditional design schemes. It is sized specifically for 1-3/4 inch thick doors, which is the standard thickness for most interior and many exterior residential door slabs.

Key Features

• Fully concealed when door is closed — no visible hinge hardware on either face
• Sized for standard 1-3/4 inch door thickness
• Heavy-duty construction rated for demanding door applications
• Satin brass finish for a warm, traditional aesthetic
• Compact footprint: 1-1/8 inches wide by 4-5/8 inches long
• Sold individually (each) — verify quantity needed per door before ordering

Compatibility

Designed as an OEM-style replacement or new-installation invisible hinge for 1-3/4 inch thick door slabs requiring a heavy-duty concealed hinge solution.

Installation Notes

Installation requires precise mortise routing into both the door edge and the door jamb using a router and a manufacturer-specified template or jig — freehand routing is not recommended. The hinge mechanism must be fully seated in the mortise before the door is hung; misalignment during seating can cause binding or prevent the hinge from folding properly. Power should be off to any electrified door hardware in the frame before beginning work. Follow local building codes for door hardware installation in fire-rated assemblies when applicable.