Soss 218ICUS3 Invisible Spring Hinge Bright Brass 1-3/4 in Doors

Product Description

The SOSS UIP ALLEGION 218ICUS3 is a heavy-duty invisible spring hinge designed for 1-3/4 inch doors. It mounts fully concealed within the door edge and jamb, leaving no hinge hardware visible when the door is closed or open. The spring mechanism provides automatic self-closing action without the need for a separate closer. Measuring 1-1/8 inches wide by 4-5/8 inches in length, it ships in a Bright Brass finish. This hinge is typically installed by carpenters, finish contractors, or millwork specialists working on commercial or high-end residential door applications.

The 218ICUS3 is suited for use on interior doors with a 1-3/4 inch door thickness. Its invisible design makes it a preferred choice for architectural applications where exposed hinges would detract from the finished appearance, such as feature doors, cabinet doors, and privacy rooms. The self-closing spring action makes it appropriate for hallways, offices, and commercial spaces requiring passive door closure compliance. Sold individually as a single unit.

Key Features

• Fully concealed installation — no hinge hardware visible when door is closed
• Built-in spring mechanism provides automatic self-closing action
• Heavy-duty construction rated for 1-3/4 inch door thickness
• Bright Brass finish for architectural compatibility
• Compact form factor: 1-1/8 inches wide by 4-5/8 inches long
• Sold as a single unit (EA)

Compatibility

Designed as an OEM-style replacement or new-installation invisible spring hinge for 1-3/4 inch interior doors requiring a concealed hinge solution.

Installation Notes

Installation requires precise mortise routing into both the door edge and the door jamb; a router with a properly sized bit and a hinge mortising jig is strongly recommended. Power down any electric strike or access control hardware associated with the door before beginning work. Follow the door manufacturer and local building code requirements for hinge quantity per door leaf based on door height and weight. Do not overtighten the pivot pins, as this can affect spring tension and self-closing performance.