SOSS 418IC Invisible Closer Hi...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$534.69
$419.57
SOSS 418IC Invisible Closer Hinge with Fire Rating for 1-3/4" Doors

SOSS 418IC Invisible Closer Hinge with Fire Rating for 1-3/4" Doors

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Model: 418ICUS26D
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$534.69
$419.57
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SOSS 418IC Invisible Closer Hinge with Fire Rating for 1-3/4" Doors

The SOSS 418IC Invisible Closer Hinge is engineered for most door types with a 1-3/4" minimum thickness, combining a fully concealed hinge with an integrated door closer that remains totally invisible from either side when the door is closed. Constructed of alloy steel materials, this heavy-duty hinge from the 418 Series opens a full 180° as a single-action hinge and features a closure rate that is completely adjustable with an allen wrench after installation, with no need to remove the closer. Underwriters Laboratories has labeled the model #418IC for use on hollow metal, sheet metal, tin clad, and steel composite swinging fire doors and frames rated up to and including three hours, on wood core doors and frames rated up to 20 minutes, and on wood/plastic composite doors constructed with Georgia Pacific FSI or FSII banding rated up to and including 90 minutes.

Key Features

  • Minimum Material Thickness: Designed for doors with 1-3/4" minimum thickness for reliable fit and operation.
  • Product Size: Measures 4-39/64" for standard invisible hinge preparation.
  • Heavy-Duty Alloy Steel Construction: Built from alloy steel materials for long-term durability in commercial applications.
  • Totally Invisible Design: The hinge and integrated closer remain completely hidden from either side when the door is closed, preserving clean door aesthetics.
  • Adjustable Closure Rate: Closure speed can be fine-tuned with an allen wrench after installation without removing the closer.
  • Full 180° Single-Action Operation: Allows the door to swing a complete 180 degrees for flexible use.
  • Flexible Installation: Can be installed either inside the door itself or inside the door jamb.
  • 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 rated up to 20 minutes, and wood/plastic composite doors with Georgia Pacific FSI or FSII banding rated up to and including 90 minutes.
  • Screws Included: Wood and machine screws are included for installation.

Certifications & Compliance

  • Underwriters Laboratories (UL) Labeled
  • Fire Rating: 20/90/180 Minute per application per manufacturer specifications

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 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
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why SOSS 418IC?

SOSS 418IC hinges are built from alloy steel for heavy-duty commercial performance and carry Underwriters Laboratories fire door labeling for demanding life-safety applications. With a fully concealed closer, adjustable closure rate, and full 180° single-action operation, the 418IC delivers professional-grade reliability for entry doors requiring both smooth operation and fire-rated protection.

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 Size:
4-39/64"
Product Category:
Door Hinges and Pivots
Product Substrate:
Alloy Steel
Department:
Door Hardware

SOSS 418ICUS26D – Frequently Asked Questions

1) Can I use the SOSS 418IC on a fire rated door, and what rating does it carry?
Yes, and the label depends on what the door is made of. UL labeled the 418IC for hollow metal, sheet metal, tin clad and steel composite swinging fire doors and frames rated up to and including three hours; for wood core doors and frames up to 20 minutes; and for wood/plastic composite doors built with Georgia Pacific FSI or FSII banding up to and including 90 minutes. So a 3 hour opening has to be a metal or steel composite door, not a wood core one.
2) Do I need a separate door closer if I install SOSS 418IC hinges?
No separate closer is required. The 418IC is a hinge with the closer built into it, so there is no overhead arm, no surface mounted body, and nothing visible from either side when the door is shut. That is the whole reason to spec it: openings where an architect or owner does not want closer hardware on the face of the door. If you need hold-open or delayed action, that is a job for a conventional surface closer instead.
3) What size mortise pocket does the SOSS 418IC need?
The 418IC is a 4-39/64 inch hinge and drops into the standard invisible hinge preparation for that size. If the doors were already routed for a 418 series invisible hinge, the pocket is the same one. SOSS publishes a hinge location drawing for setting the layout on a new prep.
4) Is the SOSS 418IC handed, and how do I order the right hand?
Handing matters on a concealed closer hinge, because the closer has to drive the door in the direction it actually swings. SOSS publishes a handing diagram for the 418IC and 218IC to work out the hand from the door's swing before you order.
5) How do you adjust the closing speed on a SOSS 418IC concealed closer hinge?
With an allen wrench, after the hinge is installed, and without pulling the closer out of the door. That matters on a fleet of doors, since a maintenance tech can retune a door that slams or fails to latch on a walk-through instead of scheduling a removal.
6) Does the SOSS 418IC mortise into the door or into the frame?
Either one. The 418IC can go in a pocket routed in the door leaf itself or in the jamb, which gives you an out when the door edge is congested with a lock case, an exit device, or an electric transfer. SOSS publishes a cased jamb detail and a hinge location detail for laying out the pocket, plus an open clearance detail for checking swing.
7) Does the SOSS 418IC swing a full 180 degrees?
It does, as a single action hinge, so the door lays back flat against the wall. Check the swing against the open clearance drawing SOSS publishes before you commit the pocket location, since a concealed hinge's clearance behaviour is set by where the pocket lands. Single action means one direction only, so it is not a double acting hinge for a swing-both-ways opening.
8) Do SOSS 418IC hinges come with screws, and how many are in a box?
Both wood and machine screws ship with the hinge, so you are covered on a wood leaf into a hollow metal frame without a second trip. Packaging is one hinge per box, priced each, so a door needing three hinges is three line items, not one.
9) Can the SOSS 418IC be electrified for an access control door?
No. The 418IC is a mechanical hinge with a mechanical closer, with no electronic option and no power transfer through it. If you need to run power to a lock in the door leaf, plan on an electric power transfer device or a separate electric hinge in the same opening, and use the 418IC for the closing function only.
10) Can I swap a SOSS 418IC into doors already prepped for plain SOSS 418 invisible hinges?
The 418IC uses the standard invisible hinge preparation at 4-39/64 inches, the same 418 series size, so the pocket geometry is the family standard. Before you order, check the open clearance and hinge location drawings against your existing routs, since the closer version has to sit where its handing and swing allow.
11) What is a SOSS 418IC hinge made of, and will it hold up on a high traffic commercial door?
Alloy steel, rated heavy duty and specified for commercial rather than residential use. It is used on entry doors in offices, schools, healthcare, retail, industrial buildings, multi-tenant residential and government facilities. The corners are radius rather than square, which is what a standard invisible hinge router jig cuts.
How fast can I get the SOSS 418ICUS26D 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 418ICUS26D come with a warranty?
Absolutely. The SOSS 418ICUS26D 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 418ICUS26D?
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 418ICUS26D from ZenSupply?
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