Soss 218US19 Heavy Duty Invisible Hinge Black Finish

Product Description

The SOSS / UIP ALLEGION 218US19 is a heavy-duty invisible hinge designed for 1.75-inch doors, engineered to remain completely concealed when the door is closed. The hinge measures approximately 1.125 inches wide by 4.625 inches long, providing a clean, hardware-free appearance on both door and frame faces. Finished in black, it suits interior and specialty door installations where aesthetics and structural integrity are both priorities. Licensed carpenters, finish carpenters, and door hardware installers work with this product in applications where standard butt hinges would compromise the design intent of the door assembly.

The 218US19 is intended for use on 1.75-inch thick doors in residential and light commercial settings. It is a drop-in replacement style invisible hinge suited to applications where a flush, seamless door face is required, such as feature walls, flush-panel doors, concealed cabinetry doors, and specialty architectural doors. Install location requires precise mortising into both the door edge and the door frame jamb to achieve proper alignment and full concealment.

Key Features

• Fully invisible when door is closed, leaving no exposed hinge hardware on door or frame face
• Heavy-duty construction rated for 1.75-inch door thickness
• Black finish for use in dark-frame or contrast architectural applications
• Compact form factor at approximately 1.125 inches x 4.625 inches for precise mortise fitting
• Sold individually, allowing quantity selection matched to door weight and height requirements

Compatibility

Designed as an OEM-style invisible hinge replacement for 1.75-inch thick interior and specialty doors requiring concealed hardware.

Installation Notes

Installation is performed by a licensed carpenter or door hardware specialist using a router and mortise template sized to the 218US19 footprint. Power down any electronic door hardware before beginning work, and verify door and frame dimensions before mortising, as cuts cannot be reversed. Follow applicable local building codes for door hardware installation in commercial occupancies. Each leaf must be mortised flush with the door edge and jamb face to achieve full concealment and correct swing geometry.