Soss 418US15 Invisible Hinge Fire Rated Alloy Steel Satin Nickel

Product Description

The SOSS UIP ALLEGION 418US15 is a heavy-duty, fire-rated invisible hinge designed for 1-3/4 inch thick door applications. Constructed from alloy steel with a satin nickel finish, this hinge installs fully concealed within the door and frame, leaving no exposed hardware when the door is closed. The result is a clean, uninterrupted door face suitable for architectural and commercial installations where aesthetics and code compliance both matter. Licensed contractors and finish carpenters install this hinge on fire-rated door assemblies where concealed hardware is specified. The hinge measures 1-1/8 inches wide by 4-39/64 inches in length and weighs 2.5 pounds per unit.

The 418US15 is suited for residential and light commercial door installations where fire-rated hardware is required by code. Its invisible design makes it a common choice for high-end interior doors, hotel corridors, office suites, and any application where surface-mounted hinges are architecturally undesirable. The satin nickel finish coordinates with standard hardware finishes across door locksets and pulls. This hinge is sold individually and is intended for use on 1-3/4 inch doors meeting fire-rated assembly requirements.

Key Features

• Fully concealed installation — no hinge visible when door is closed
• Fire-rated construction for code-compliant door assemblies
• Heavy-duty alloy steel body for long-term cycle durability
• Satin nickel finish for a clean, neutral appearance
• Designed specifically for 1-3/4 inch door thickness
• Sold individually — order quantity of one each

Compatibility

Designed as an OEM-style replacement or new-installation invisible hinge for 1-3/4 inch fire-rated door assemblies requiring concealed hardware.

Installation Notes

Installation requires precise mortising into both the door edge and the door frame; a router and hinge mortise template are standard tools for this work. Power to any access-controlled or electrified door hardware must be shut off before beginning installation. Fire-rated door assemblies must be installed in accordance with the door and hardware manufacturer listings and applicable fire codes — do not modify the door or frame in ways that void the fire rating. This work is typically performed by a licensed carpenter, door installer, or general contractor familiar with fire-rated assembly requirements.