SOSS 218IC Invisible Spring Cl...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$216.94
$165.00
SOSS 218IC Invisible Spring Closer Hinge 7" - 626 Satin Chrome, 1-3/4" Minimum Door Thickness

SOSS 218IC Invisible Spring Closer Hinge - 7" Heavy Duty, 1-3/4" Minimum Door Thickness

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Model: 218ICUS26D
From the 218 Series Collection
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$216.94
$165.00
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SOSS 218IC Invisible Spring Closer Hinge

The SOSS 218IC is a 7" heavy-duty invisible spring closer hinge for doors with a minimum material thickness of 1-3/4". Constructed of zinc and steel with nylon links, it remains completely invisible from either side when the door is closed. UL labeled for use on hollow metal, sheet metal, tin clad, steel composite, and wood core swinging fire doors and frames with a 20-minute fire rating.

Key Features

  • Invisible When Closed: Fully concealed from both sides; can be installed inside the door or inside the door jamb.
  • 180-Degree Single-Action Operation: Opens a full 180 degrees as a single-action hinge.
  • Adjustable Closure Rate: Closure speed is adjustable with an allen wrench after installation without removing the closer.
  • Heavy-Duty Construction: Zinc and steel body with nylon links for added strength in demanding commercial use.
  • Hardware Included: Wood and machine screws included.

Certifications and Compliance

  • Underwriters Laboratories (UL) Labeled
  • 20-Minute Fire Rating on qualifying door and frame assemblies

Technical Specifications

  • Size: 7"
  • Min. Material Thickness: 1-3/4"
  • Material: Zinc and Steel with Nylon Links
  • Corner Type: Radius
  • Duty Level: Heavy Duty
  • Application: Full Sized Entry, Metal, Wood
  • Fire Rating: 20 Minute
  • Compatible Door Types: Hollow metal, sheet metal, tin clad, steel composite, wood core swinging fire doors and frames
  • Electronic: No
  • Power Transfer: No
  • Counter Bored Screw Holes: No
  • Screws Included: Wood and Machine
  • Commercial/Residential: Commercial
  • Sold As: Each

Typical Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Product Specs

Subcategory:
Hinges and Pivots
Product Group:
Door Hinges and Pivots
Product Subgroup:
Spring Hinges
Product Type:
Spring Hinges
Commercial/Residential:
Commercial
Duty Level:
Heavy Duty
Electronic:
No
Corner Type:
Radius
Series:
218 Series
Collection:
218 Series
Product Function:
Spring Hinges
Product Size:
7"
Product Category:
Door Hinges and Pivots
Product Substrate:
Zinc and Steel
Department:
Door Hardware

SOSS 218ICUS26D – Frequently Asked Questions

1) Does the SOSS 218IC close the door by itself, or do I still need a surface closer?
The 218IC is a self-closing hinge, so it does the closing job without a surface closer hanging off the door face. The spring closer is built into the hinge body and stays out of sight from both sides once the door is shut. Closing speed is set with an allen wrench after the hinge is installed, so you can dial it in on site without pulling the closer back out of the mortise.
2) Is the SOSS 218IC hinge approved for a fire rated door?
UL labeled, and the label covers 20 minute swinging fire doors and frames: hollow metal, sheet metal, tin clad, steel composite, or wood core. That is the extent of the listing, so a 45, 60, or 90 minute opening is outside what the 218IC is labeled for. On a 20 minute assembly it is a self-closing hinge, which is the piece a fire door needs to latch itself.
3) What can be used instead of the SOSS 218IC when the opening does not require a concealed hinge?
The SOSS 218IC is a 7 inch invisible spring closer hinge that stays hidden from either side when the door is closed and can be installed inside the door itself or inside the door jamb. Where concealment is not part of the requirement, a full mortise spring hinge does the same self-closing work with visible leaves. The Hager 1250 is a full mortise spring hinge in standard weight steel construction, and the McKinney 1502 is a square corner full mortise standard weight spring hinge measuring 4-1/2 inches by 4-1/2 inches. Both of those are medium duty, while the 218IC is heavy duty and is built for doors with a 1-3/4 inch minimum material thickness.
4) Can a SOSS 218IC be mortised into the jamb instead of the door?
Either one. The 218IC can be routed into the door leaf or into the door jamb, and it stays completely concealed whichever side you cut. That flexibility matters on retrofits where the door has existing prep you don't want to enlarge, or where the jamb is easier to machine. SOSS publishes a cased jamb detail and a hinge location drawing for the 218IC to lay out the cut.
5) Invisible hinge or a standard spring butt hinge for a self-closing door?
It comes down to the look and the existing prep. The SOSS 218IC disappears entirely when the door is closed, which is why it gets specified where nothing should show on the face or edge, but it requires routing a pocket in the door or jamb and a 1-3/4 inch minimum thickness. A conventional full mortise spring hinge, like the Hager 1250 or the McKinney 1502, shows its leaves and barrel at the edge but drops into a standard hinge pocket, so it is the faster swap when you're replacing hinges already hung on the opening.
6) Is the SOSS 218IC sold as a pair or one at a time?
One at a time. The 218IC ships one to a box, priced each, so an opening taking more than one invisible hinge means ordering that quantity. Worth checking against how you're used to buying: the Emtek 95013 spring hinge, for instance, is packaged as a pair, so a quantity of one there is two hinges.
7) Can I run power through the SOSS 218IC for an electric strike or maglock?
No. The 218IC has no power transfer and is not an electrified hinge, so there's no path through it for door loop wiring. If the opening has an electric strike, a maglock, or a request-to-exit device on the leaf, plan a separate electric power transfer or door loop for the wire run and use the 218IC purely for hanging and closing the door.
8) How do you adjust the closing speed on a SOSS 218IC after it is installed?
With an allen wrench, and the closer stays in the door. The closure rate on the 218IC is fully adjustable in place, so if a door is slamming or hanging open after the building settles or the weatherstrip is changed, maintenance can retune it without unscrewing the hinge or pulling it out of the mortise. That is the practical difference from a fixed-tension spring butt hinge that has to be re-tensioned with a pin.
9) Is a Deltana double action spring hinge a substitute for the SOSS 218IC?
They hang doors that swing differently. The Deltana DASHS is a double action saloon hinge sold each in 4 inch, 5 inch and 6 inch heights, and the Deltana DASH95 is a double action spring hinge with solid brass cover plates; double action means the door swings through the frame in both directions. The SOSS 218IC is a single action invisible spring closer hinge that opens a full 180 degrees in one direction and returns the door to the closed position. If the opening is a one-way swing door with a stop, the double action hinges will not work in its place.
10) How does the duty rating of the SOSS 218IC compare with other spring hinges for a high traffic door?
The SOSS 218IC is rated heavy duty, built from zinc and steel with nylon links. The common full mortise alternatives are rated medium duty: the Hager 1150, 1250, 1251 and 1252 full mortise spring hinges, the McKinney 1502, the Orca Hardware 4014, 4040 and 4058 Series spring hinges, the BEST 2060R and RD2060R, and the Design Hardware UL spring hinge are all medium duty. For a stairwell or corridor door that cycles constantly, that difference in duty rating is the spec to check first.
11) Can a Pemko spring loaded continuous hinge take the place of the SOSS 218IC on a full sized entry door?
Those are built for a different opening. The Pemko Markar FM400 Series and FM900 Series are spring loaded continuous hinges with 80 lb load capacity for toilet partitions, the Pemko FS402 Series is a spring loaded continuous hinge for toilet partitions with the same 80 lb load capacity, and the Pemko Markar FS902 Series is the 80 lb capacity version in 304 stainless steel. The SOSS 218IC is a 7 inch heavy duty invisible spring closer hinge for full sized entry doors with a 1-3/4 inch minimum material thickness, UL labeled for use on hollow metal, sheet metal, tin clad, steel composite or wood core swinging fire doors and frames with a 20 minute fire rating. For a partition door, the Pemko continuous hinges apply; for a rated or full sized entry door, they do not.
12) Which spring hinges have radius corners like the SOSS 218IC?
The SOSS 218IC uses a radius corner type. Among other self-closing hinges, the Hager 1251 is a full mortise spring hinge with 1/4 inch round corners and the Hager 1252 is the same full mortise spring hinge with 5/8 inch round corners, both in standard weight steel. Orca Hardware offers a 4 by 4 inch spring hinge with a 1/4 inch radius corner in the 4014 Series and a 4 by 4 inch spring hinge with a 5/8 inch radius corner in the 4058 Series, plus an SPR4058 Series version of the 5/8 inch radius hinge with a Z hole pattern. The Deltana DSH35R4 is a single action spring hinge at 3-1/2 by 3-1/2 inches with a 1/4 inch radius in steel, and the BEST RD2060R is a plain bearing spring hinge with a removable pin in a radius corner, standard weight. Radius corners come in two common sizes, so confirm whether the existing prep is 1/4 inch or 5/8 inch before ordering.
13) What other self-closing hinges carry a UL listing besides the SOSS 218IC?
The SOSS 218IC is Underwriters Laboratories labeled for use on hollow metal, sheet metal, tin clad, steel composite or wood core swinging fire doors and frames with a 20 minute fire rating. The Emtek 95013 is a UL listed spring hinge in plated steel, sold as a pair, measuring 3-1/2 by 3-1/2 inches with square corners. Design Hardware also builds a UL spring hinge in medium duty. Match the label to what the door assembly on the drawing calls for, since a UL listing on the hinge and a fire rating on the assembly are stated separately.
14) Does the finish on a SOSS 218IC matter if the hinge is hidden?
Only when the door is open, since the 218IC vanishes from both sides once the door is shut. Standing in a doorway you see the hinge body in the reveal, so most people match it to the lever and closer trim on the opening. Six finishes are offered: 606 satin brass, 613L oil rubbed bronze lacquered, 619 satin nickel, 622 matte black, 625 bright chrome, and 626 satin chrome.
15) What fasteners come with the SOSS 218IC, and do I need anything else to hang the door?
Both wood and machine screws are in the box, which covers the wood and metal openings the 218IC is specified for. The screw holes are not counterbored, and the corners are radius. Beyond the hinges themselves and the router work to cut the pocket in the door or jamb, no separate closer or arm is needed, since the closing mechanism is inside the hinge.
16) How far does a SOSS 218IC let the door swing, and how much clearance does the opening need?
A full 180 degrees, as a single action hinge, so the door can lay back against the wall where the opening allows it. Invisible hinges swing on a linkage rather than a fixed barrel, so the leaf moves away from the jamb as it opens and the reveal behaves differently from a butt hinge. SOSS publishes an open clearance detail and a 90 degree open drawing for the 218IC, and those are what to lay out against before cutting, especially where the door opens into a return wall or a tight corner.
17) Is there a self-closing hinge with a removable pin as an alternative to the SOSS 218IC?
Yes. The BEST 2060R is a plain bearing spring hinge with a removable pin in square corners, standard weight, and the BEST RD2060R is the same plain bearing spring hinge with a removable pin in a radius corner, standard weight; both are medium duty. A removable pin lets the door leaf be lifted off the frame leaf during turnover work. The SOSS 218IC works differently, since it is a 7 inch invisible hinge routed into the door or the jamb and concealed from both sides when the door is closed.
18) How does the 7 inch size of the SOSS 218IC line up against other spring hinge sizes?
The SOSS 218IC is a 7 inch invisible hinge, and that 7 inches is the length of the hinge body mortised into the door or the jamb rather than a leaf dimension. The mortise spring hinges are called out by leaf size instead: the McKinney 1502 is 4-1/2 by 4-1/2 inches, the Orca Hardware 4040, 4014 and 4058 Series hinges are 4 by 4 inches, and the Deltana DSH35R4 and Emtek 95013 are 3-1/2 by 3-1/2 inches. The Deltana DASHS is offered in 4 inch, 5 inch and 6 inch heights. Size the replacement to the prep already cut in the door, not to the number on the hinge you are replacing.
19) Do spring hinges from other brands come as singles or pairs when cross referencing the SOSS 218IC?
It varies by brand, so count carefully when building a door schedule. The Emtek 95013 UL listed spring hinge is sold as a pair, the Deltana DASHS double action saloon hinge is sold each, and the SOSS 218IC is packaged one per box, one each. A schedule written in pieces and filled with pairs, or the reverse, is the usual source of a short shipment on a multi-door job.
How fast can I get the SOSS 218ICUS26D 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 218ICUS26D come with a warranty?
Absolutely. The SOSS 218ICUS26D 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 218ICUS26D?
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
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