Soss 212US4 Invisible Hinge Satin Brass Medium Duty

Product Description

The SOSS / UIP ALLEGION 212US4 is a medium duty invisible hinge designed for interior doors with a 1-1/8 inch door thickness. When installed, the hinge is completely concealed within the door and frame, leaving no exposed hardware on the face of the door. This creates a clean, uninterrupted surface on both the door and the jamb. The 212US4 ships in a satin brass finish and is sold individually. Installers should verify door prep dimensions before ordering, as invisible hinges require precise mortising into both the door edge and the door frame jamb.

This hinge is suited for residential and light commercial interior door applications where a flush, hardware-free appearance is required. Common installations include passage doors, interior architectural doors, and specialty millwork applications where traditional butt hinges or surface-mounted hardware would interrupt the visual profile of the door. The medium duty rating makes it appropriate for standard interior door weights and frequencies of use.

Key Features

• Fully concealed design — no visible hardware when door is closed or open
• Medium duty rating suited for standard interior door weights
• Satin brass finish for consistent appearance in architectural applications
• Designed for doors with 1-1/8 inch thickness
• Sold individually — order quantity is one hinge per unit

Compatibility

Designed as an OEM-style replacement or new-installation invisible hinge for interior doors with a 1-1/8 inch door thickness requiring a fully concealed hinge solution.

Installation Notes

Invisible hinges require precise routing or mortising into both the door edge and the door frame jamb — a router with a hinge template is strongly recommended. This work is typically performed by a finish carpenter or millwork installer. Always confirm door thickness and hinge mortise dimensions before installation to ensure a flush fit. Follow all applicable local building codes for door hardware installation.