SOSS 216 Series 4-5/8" Invisib...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$65.76
$57.48
SOSS 216 Series 4-5/8" Invisible Hinge for 1-3/8" to 1-3/4" Doors

SOSS 216 Series 4-5/8" Invisible Hinge for 1-3/8" to 1-3/4" Doors

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Model: 216US26D
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$65.76
$57.48
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SOSS 216 Series 4-5/8" Invisible Hinge for 1-3/8" to 1-3/4" Doors

The SOSS 216 Series 4-5/8" Invisible Hinge is engineered for full-size entry doors in wood or metal applications ranging from 1-3/8" to 1-3/4" thick. When closed, the hinge is completely concealed within the door and frame - no exposed barrel, no visible hardware. Built from zinc and steel for heavy-duty commercial-grade performance, this radius corner hinge opens a full 180° as a single-action unit, making it the go-to choice for high-end residential, commercial, and institutional installations where a flush fit and clean aesthetic are required.

Key Features

  • Hinge Size and Door Thickness Range: 4-5/8" hinge size supports doors from 1-3/8" minimum to 1-3/4" maximum material thickness.
  • Heavy-Duty Construction: Zinc and steel construction rated for heavy-duty commercial applications.
  • Fully Concealed Design: Completely invisible when the door is closed, with no exposed hinge barrel.
  • Full 180° Operation: Single-action operation allows the door to swing a full 180 degrees.
  • Wood and Metal Compatibility: Suitable for full-sized entry applications in both wood and metal door and frame assemblies.
  • Radius Corner Type: Radius corner design provides a clean, precise mortise fit.
  • Finish Options: Available in 10 standard finishes, with 24 Karat Gold available by special order.
  • Hardware Included: Wood and machine screws included for installation flexibility.

Technical Specifications

  • Hinge Size: 4-5/8"
  • Min. Material Thickness: 1-3/8"
  • Max. Material Thickness: 1-3/4"
  • Application: Full Sized Entry, Metal, Wood
  • Material: Zinc and Steel
  • Corner Type: Radius
  • Duty Level: Heavy Duty
  • Screws Included: Wood and Machine
  • Packaging: 1 Each per Box
  • Price Per: Each

Typical Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings
  • High-End Residential Entry Doors

Why SOSS 216?

SOSS 216 Series hinges deliver professional-grade reliability with heavy-duty zinc and steel construction designed for full-sized entry doors in both wood and metal applications. The fully concealed radius corner design ensures a clean mortise fit, while full 180° single-action operation supports dependable performance in demanding commercial, institutional, and residential installations.

Product Specs

Subcategory:
Hinges and Pivots
Commercial/Residential:
Commercial
Product Group:
Door Hinges and Pivots
Product Type:
Hinges and Pivots
Product Subgroup:
Invisible Hinges
Duty Level:
Heavy Duty
Electronic:
No
Corner Type:
Radius
Series:
216 Series
Product Function:
Invisible Hinges
Product Size:
4-5/8"
Product Category:
Door Hinges and Pivots
Product Substrate:
Zinc and Steel
Department:
Door Hardware

SOSS 216US26D – Frequently Asked Questions

1) Will the SOSS 216 invisible hinge work on a 1-3/4 inch door?
Yes. The 4-5/8 inch 216 covers material from 1-3/8 inches minimum up to 1-3/4 inches maximum, so a standard 1-3/4 commercial door is right at the top of its range and a lighter 1-3/8 interior door is at the bottom. Both the door and the frame have to fall in that range, since the hinge mortises into each. A door thicker than 1-3/4 is outside what the 216 at this size handles.
2) Can I put SOSS 216 invisible hinges on a door that already has butt hinges?
Not as a straight swap. A butt hinge sits in a shallow rectangular mortise on the door edge with its barrel standing proud of the edge. The 216 is fully concealed, which means a deeper pocket routed into the door edge and a matching pocket in the frame. The existing butt prep is the wrong shape and depth for it, so a retrofit means plugging and re-machining both the door and the jamb. In practice the 216 goes in on new doors, new frames, or a full door replacement, not as a hinge-for-hinge change on an existing opening.
3) Does the SOSS 216 invisible hinge work on hollow metal doors and frames, or wood only?
Both. The 216 is built for full sized entry applications in wood and in metal, and it ships with wood screws and machine screws in the box so the right fastener is there either way, machine screws into tapped metal and wood screws into a wood door or jamb. The pocket still has to be mortised into the door edge and into the frame in both cases.
4) Can the SOSS 216 be ordered with an electric power transfer for a card reader or electrified lock?
No. The 216 is a mechanical hinge with no electronic option, so there is no wire path through the hinge. If the opening has an electric strike, electrified lever or maglock, power has to get across the gap some other way, typically an electric power transfer mortised into the door edge and frame, or a surface door loop. Plan that prep at the same time as the hinge pockets, because both land in the same edge of the door.
5) Is any part of a SOSS 216 hinge visible when the door is closed?
Nothing shows. With the door shut the whole hinge is buried in the pockets in the door edge and the jamb, so there is no knuckle, no barrel and no plate on either face of the door. The finish you pick only comes into view on the door edge once the door swings open, which is why it gets specified on flush panel and high end entry doors where a standard hinge would interrupt the face.
6) Are SOSS 216 hinges sold each or by the pair, and do I need to buy screws separately?
Each. The 216 comes one per box and is priced each, with wood screws and machine screws already in the box, so nothing extra is needed to fasten it. Count the hinges per door and order that quantity, a three hinge door is three of them, and remember the hinges on a single opening should all be the same finish code.
7) Is the SOSS 216 invisible hinge strong enough for a commercial entry door?
It is a heavy duty, commercial grade hinge in zinc and steel, sized for full sized entry doors rather than cabinet or light passage work. That is the class it is built in, which is why it turns up on office buildings, schools, healthcare, retail and multi tenant residential entries. For any opening, weigh the door and set the hinge count accordingly, the same as you would with butt hinges.
8) What is the SOSS part number for the 216 hinge in satin chrome?
216US26D. SOSS carries the finish in the model number using the old US code, so the satin brass 606 version is 216US4 and satin chrome 626 is 216US26D. When you are ordering or matching an existing door, quote the 216 base number plus the finish code rather than the finish name, since brass and bronze descriptions vary between suppliers.
9) When should I specify an invisible hinge instead of a standard hinge on a commercial door?
Go invisible when the look of the door edge and face matters and you can control the door prep. The 216 disappears completely when the door is closed, opens a full 180 degrees, and is heavy duty for full sized entry doors in wood or metal, so it suits executive suites, lobbies, healthcare and high end residential entries. Stay with a butt or continuous hinge when you are replacing hardware on doors that are already hung and prepped, when the door is thinner than 1-3/8 or thicker than 1-3/4 inches, or when you need power transfer through the hinge, none of which the 216 handles.
10) What finishes can I get the SOSS 216 invisible hinge in?
Ten standard finishes: UNP unplated, 605 bright brass, 606 satin brass, 609 antique brass, 613L oil rubbed bronze lacquered, 618 bright nickel, 619 satin nickel, 622 matte black, 625 bright chrome and 626 satin chrome. 24 karat gold is available as a special order. Since the hinge is hidden with the door closed, the finish only reads on the door edge when the door is open, so match it to the lockset and edge hardware rather than worrying about the face of the door.
11) Does the SOSS 216 need square corner mortises or can the pockets be routed?
Radius corner. The 216 is a radius corner hinge, so the rounded corners a router bit naturally leaves in the pocket match the hinge and there is no chisel work to square them out. That speeds up prep when you are doing a run of doors, but it also means a square corner pocket cut for a different hinge is not the right prep for this one.
12) Is there a self closing version of the SOSS 216 invisible hinge?
Yes, the 216IC is the self closing variant of the 216 and SOSS publishes a separate drawing for it. If the opening needs the door to return on its own without a surface closer hanging on the face, that is the model to specify. If you are ordering the standard 216 and the door still has to close itself, budget for a separate closer.
13) Will a SOSS 216 invisible hinge install in a cased or rabbeted jamb?
SOSS covers cased jamb conditions for the 216 with its own installation detail, alongside the hinge location drawing that sets where the pockets go on the door and frame. Pull both before machining, because the jamb condition changes where the frame pocket sits relative to the stop, and a pocket cut off the detail is not something you fix after the door is hung.
How fast can I get the SOSS 216US26D 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 216US26D come with a warranty?
Absolutely. The SOSS 216US26D 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 216US26D?
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 216US26D from ZenSupply?
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