SOSS 418SSIC Invisible Closer ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$642.00
$507.82
SOSS 418SSIC Invisible Closer Hinge, 316 Stainless Steel with Fire Rating

SOSS 418SSIC Invisible Closer Hinge, 316 Stainless Steel with Fire Rating

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Model: 418SSICUS32D

In Stock (leaves warehouse same day if ordered before 3pm ET)

$642.00
$507.82
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SOSS 418SSIC Invisible Closer Hinge, 316 Stainless Steel with Fire Rating

The SOSS 418SSIC Invisible Closer Hinge is engineered for doors 1-3/4" thick and constructed of complete 316 stainless steel for exceptional corrosion resistance and durability. This single action hinge opens a full 180° while remaining totally invisible from either side of the door when closed. The closure rate is completely adjustable with an allen wrench after installation, without requiring removal of the closer, and installation can be completed inside the door itself or inside the door jamb. Underwriters Laboratories labeled, the 418SSIC carries fire ratings of 20/90/180 Minute depending on door construction and material.

Key Features

  • Door Thickness Compatibility: Designed for doors that are 1-3/4" thick, suitable for full-sized entry, metal, and wood applications.
  • Product Size: Hinge measures 4-39/64" for accurate door and frame preparation.
  • Fire Rating: UL labeled for use on hollow metal, sheet metal, tin clad, and steel composite fire doors and frames rated up to and including three hours; wood core doors and frames rated up to 20 minutes; and wood/plastic composite doors with Georgia Pacific FSI or FSII banding rated up to and including 90 minutes.
  • Heavy-Duty Construction: Complete 316 stainless steel materials provide long-term strength and corrosion resistance for demanding commercial environments.
  • Adjustable Closure Rate: Closure speed can be fine-tuned with an allen wrench after installation without removing the closer from the door.
  • Full 180° Swing: Single action hinge design allows the door to open a complete 180 degrees.
  • Invisible Design: Totally concealed from either side of the door when closed, preserving clean sightlines.
  • Hardware Included: Wood and machine screws are included for straightforward installation.

Certifications & Compliance

  • Underwriters Laboratories (UL) Labeled
  • Fire Rating: 20/90/180 Minute

Technical Specifications

  • Subcategory: Hinges and Pivots
  • Product Group: Door Hinges and Pivots
  • Product Subgroup: Spring Hinges
  • Commercial/Residential: Commercial
  • Duty Level: Heavy Duty
  • Electronic: No
  • Corner Type: Radius
  • Series: 418 Series
  • Product Function: Spring Hinges
  • Product Finish: US32D - Satin Stainless Steel
  • Product Size: 4-39/64"
  • Product Category: Door Hinges and Pivots
  • Department: Door Hardware
  • Application: Full Sized Entry, Metal, Wood
  • Min. Material Thickness: 1-3/4″
  • Fire Rating: 20/90/180 Minute
  • Power Transfer: No
  • Closer: Yes
  • Counter Bored Screw Holes: No
  • Screws Included: Wood and Machine
  • Packaging: 1 / Box = 1 Each
  • Packages Per Container: 1 Each
  • Price Per: Each

Typical Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings
  • Fire-Rated Door Assemblies

Why SOSS 418 Series?

SOSS 418 Series invisible closer hinges deliver professional-grade reliability through complete 316 stainless steel construction and Underwriters Laboratories fire door labeling up to 180 minutes depending on application. Engineered for demanding commercial applications where concealed hardware, adjustable closure performance, and fire-rated compliance are essential.

Product Specs

Subcategory:
Hinges and Pivots
Product Group:
Door Hinges and Pivots
Product Type:
Invisible Hinges
Product Subgroup:
Spring Hinges
Commercial/Residential:
Commercial
Duty Level:
Heavy Duty
Electronic:
No
Corner Type:
Radius
Series:
418 Series
Product Function:
Spring Hinges
Product Finish:
US32D - Satin Stainless Steel
Product Size:
4-39/64"
Product Category:
Door Hinges and Pivots
Product Substrate:
Stainless Steel
Department:
Door Hardware

SOSS 418SSICUS32D – Frequently Asked Questions

1) Can I use the SOSS 418SSIC on a fire rated door?
Yes, and the rating depends on what the door is made of. The 418SSIC is UL labeled for hollow metal, sheet metal, tin clad, and steel composite fire doors and frames rated up to and including three hours; wood core doors and frames up to 20 minutes; and wood/plastic composite doors with Georgia Pacific FSI or FSII banding up to and including 90 minutes. Match the rating to your door construction before you spec it into a labeled assembly.
2) Does the SOSS 418SSIC replace a separate door closer, or do I still need one?
It replaces the surface closer on that opening. The 418SSIC is an invisible hinge with the closer built into the hinge body, so you get self-closing action with nothing mounted on the door face or head. Closing speed is adjusted with an allen wrench after the hinge is installed, without pulling the closer out of the door.
3) How much door and frame prep does the SOSS 418SSIC need, and does it mortise into the door or the jamb?
The hinge body measures 4-39/64 inches, and that is the pocket dimension you rout for. Installation can be made inside the door itself or inside the door jamb, so you have a choice depending on which leaf you would rather cut. Corners are radius, not square, so a router template gives you the profile without hand chiseling. SOSS publishes a hinge location detail, a cased jamb detail, and an open clearance detail for laying the prep out.
4) Is 316 stainless the right hinge material for a coastal or wash-down opening?
That is exactly where it earns its place. The 418SSIC is complete 316 stainless steel, the grade specified for corrosion resistance in salt air, pool rooms, and cleanable healthcare or food-service environments, and it is finished US32D satin stainless. Plated steel invisible hinges will not hold up the same way in those conditions.
5) Do I have to specify handing when ordering the SOSS 418SSIC?
SOSS publishes a handing diagram for the 218IC/418 style invisible closer hinges, so confirm the swing of the opening against that diagram before you order. The 418SSIC is a single action hinge, meaning the door swings one direction only, up to a full 180 degrees.
6) Will the door still open a full 180 degrees with an invisible closer hinge?
Yes. The 418SSIC swings a full 180 degrees and is totally concealed from both sides of the door when it is closed, so you keep the flush sightline architects ask for without giving up swing. SOSS publishes an open clearance detail worth checking if the door swings back against a wall or adjacent trim.
7) Are screws included with the SOSS 418SSIC, and is it sold as a pair or singly?
Both wood and machine screws ship with it, so the hinge covers a wood door or a hollow metal frame without a separate fastener order. It is packaged and priced one per box, each, not as a pair. Order the quantity your door schedule calls for per leaf.
8) Does the SOSS 418SSIC support electrified hardware or power transfer to the door?
No. The 418SSIC is a mechanical invisible closer hinge with no electrical function and no power transfer through the hinge. If you need to run power to an electrified lock or exit device, plan on a separate electric power transfer or door loop.
9) Is the 418SSIC heavy duty enough for a high traffic commercial entry?
It is rated commercial, heavy duty, and intended for full sized entry doors in metal or wood. Typical uses are office buildings, schools, healthcare, retail, government buildings, and multi-tenant residential, including fire rated assemblies.
How fast can I get the SOSS 418SSICUS32D delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the SOSS 418SSICUS32D come with a warranty?
Absolutely. The SOSS 418SSICUS32D is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the SOSS 418SSICUS32D?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the SOSS 418SSICUS32D from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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