Soss 218 IC Invisible Closer 1-3/4" Minimum Door Closer

The SOSS 218IC is an invisible spring closer, a hinge and a self-closing door closer in one, completely hidden from both sides when the door is closed. SOSS pioneered the invisible hinge, a concealed hinge that mortises fully into the door and frame so no barrel or knuckle shows on either face. The 218IC takes that a step further by building a spring closer into the invisible hinge, so the door closes itself automatically with nothing visible doing the work. There's no surface closer, no exposed arm, no visible hinge, just a clean door that swings shut on its own. It's sized for doors 1-3/4" thick minimum and suits full-sized entry doors in wood or metal.

What an invisible self-closing hinge does

This is worth understanding, because the 218IC replaces two visible pieces of hardware at once. Normally a self-closing door needs hinges plus a separate door closer (a surface-mounted body and arm, or a concealed overhead closer), and all of that shows. The SOSS 218IC combines both functions in a single concealed unit: it carries the door like a hinge and pulls it shut like a closer, while staying completely out of sight when the door is closed. For high-end residential, architectural, and design-driven commercial interiors where exposed hardware would spoil the look, that invisible self-closing action is exactly the appeal. It's why designers reach for SOSS spring closers on feature doors, hidden doors, and clean modern openings.

The closer is a true spring closer, so the self-closing force comes from an internal spring rather than a hydraulic body, keeping the whole assembly compact enough to conceal.

Adjustable, 180 degrees, installs in door or jamb

The 218IC is built to be practical, not just good-looking. The closure rate is completely adjustable with an Allen wrench after installation, and you adjust it without removing the spring closer, so you can fine-tune how fast or slow the door closes once it's hung. The hinge opens a full 180 degrees and is a single-action hinge, swinging one direction like a standard door. Installation is flexible: it can be mortised into the door itself or into the door jamb, whichever your application calls for. Wood mounting screws are included.

SOSS 218IC specifications

• Type: Invisible spring closer (self-closing invisible hinge). Hinge and door closer combined.

• Visibility: Completely concealed from both sides when the door is closed.

• Closing: Spring closer with closure rate fully adjustable by Allen wrench after installation (no removal needed).

• Swing: Opens a full 180 degrees. Single action.

• Application: Full-sized entry doors, wood or metal.

• Minimum material thickness: 1-3/4".

• Mounting: Inside the door or inside the door jamb.

• Screws: Wood screws included.

• Model: 218IC.

Why choose the SOSS 218IC

SOSS has been the name in invisible hinges for over a century, and the 218IC is its self-closing version, the choice when you want a door to close itself with zero visible hardware. You get a concealed hinge and a concealed closer in one mortised unit, an adjustable closing speed you can dial in after hanging the door, full 180-degree swing, and installation flexibility into either the door or the jamb. For architects, designers, and builders working on hidden doors, premium entries, and minimalist interiors, the 218IC delivers self-closing function without breaking the clean look.

One thing to confirm before ordering: the 218IC requires a minimum door thickness of 1-3/4", and it's the spring-closer version. If you want the invisible hinge without the self-closing function, that's the standard SOSS 218, if you need a fire-rated invisible hinge, that's the 218FR, and for 2" minimum doors, the 220IC is the closer version. Verify your door thickness and how many hinges your door weight and height require.

Order the SOSS 218IC from American Locksets

We stock the full SOSS invisible hinge line from authorized distribution, so every hinge ships with the manufacturer warranty. Compare models and sizes in the invisible hinges category, or browse all door hinges.