SOSS 218 Series Invisible Hing...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$70.86
$62.32
SOSS SOSS 218 Series Invisible Hinge 4-5/8" (1-3/4" Minimum Door Thickness) 218

SOSS 218 Series Invisible Hinge 4-5/8" with 20 Minute UL Fire Rating

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Model: 218US26D
From the 218 Series Collection
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$70.86
$62.32
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SOSS 218 Series Invisible Hinge 4-5/8" with 20 Minute UL Fire Rating

The SOSS 218 Series Invisible Hinge is a full size door style hinge measuring 4-5/8" and designed for wood or metal applications with a minimum door thickness of 1-3/4" to 2". Constructed of zinc and steel with nylon links for added strength and durability, this hinge opens a full 180° as a single action hinge. The model #218 now carries a 20 Minute UL Fire rating, making it suitable for hollow metal, sheet metal, tin clad, steel composite, or wood core swinging type fire doors and frames.

Key Features

  • Minimum Material Thickness: Designed for doors 1-3/4" thick, supporting full size entry applications in metal and wood.
  • Product Size: 4-5/8" hinge size delivers a flush fit and compact profile for superior appearance.
  • Heavy-Duty Construction: Made of zinc and steel materials with nylon links that add strength and durability for long-term reliability.
  • Full 180° Operation: Single action hinge design opens a full 180° for smooth, unobstructed door movement.
  • Fire-Rated Performance: 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 rating.
  • Fire Door Hinge Requirements: Use at least one fire-rated hinge for every 20" of door height or portion thereof, or one hinge for every 60 lbs. or fraction thereof, whichever demands more hinges.
  • Hardware Included: Wood and machine screws are included for versatile installation on multiple substrate types.
  • Invisible Design: Flush fit and compact size make this hinge ideal for applications requiring smooth operation and minimal visibility when the door is closed.

Certifications & Compliance

  • UL Listed, 20 Minute Fire Rating

Technical Specifications

  • Subcategory: Hinges and Pivots
  • Commercial/Residential: Commercial
  • Product Group: Door Hinges and Pivots
  • Product Type: Hinges and Pivots
  • Duty Level: Heavy Duty
  • Electronic: No
  • Corner Type: Radius
  • Series: 218 Series
  • Collection: 218 Series
  • Product Size: 4-5/8"
  • Product Category: Door Hinges and Pivots
  • Department: Door Hardware
  • Application: Full Sized Entry, Metal, Wood
  • Min. Material Thickness: 1-3/4″
  • Fire Rating: 20 Minutes
  • Power Transfer: No
  • Closer: No
  • 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 218?

SOSS 218 Series hinges combine zinc and steel construction with nylon links to deliver dependable strength and smooth, full 180° operation. With a 20 Minute UL Fire rating, this hinge is engineered for demanding commercial applications where fire door compliance, flush appearance, and compact size are essential.

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:
218 Series
Collection:
218 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 218US26D – Frequently Asked Questions

1) What door thickness does this invisible hinge require?
This hinge requires a minimum 1-3/4 inch door thickness. Standard residential doors at 1-3/8 inch will not work with this heavy-duty invisible hinge.
2) How much weight can this 4-5/8 inch invisible hinge support?
This industrial-grade invisible hinge supports heavy commercial doors. Check manufacturer specifications for exact weight ratings based on your door material and size.
3) Does this hinge work with left and right hand doors?
Yes, this invisible hinge adjusts for both left and right hand door applications. The concealed design works with standard handing configurations.
4) What does the US26D finish look like?
US26D is satin chrome finish. It provides a brushed, non-reflective appearance that resists fingerprints and matches other satin chrome hardware.
5) Where are invisible hinges typically used?
Invisible hinges work best on heavy commercial doors, security doors, and high-end architectural applications where concealed hardware is required for clean aesthetics.
6) How many invisible hinges do I need per door?
Most heavy doors require 2-3 invisible hinges depending on door weight and height. Consult manufacturer guidelines for your specific door specifications.
7) What tools are needed for invisible hinge installation?
Installation requires precise mortising tools, drill bits, chisels, and routing equipment. Follow manufacturer templates exactly for proper alignment and operation.
8) Can this hinge be field adjusted after installation?
Some adjustment is possible but limited compared to standard hinges. Precise initial installation is critical for proper long-term operation.
9) Do invisible hinges require special maintenance?
Clean periodically with mild soap and water. Lubricate pivot points annually with light machine oil. Avoid harsh cleaners that can damage the satin chrome finish.
10) Are there other sizes available in the 218 series?
The 218 series includes multiple sizes for different door applications. Check our hinges section for other invisible hinge options.
11) What door frame preparation is required?
Both door and frame require precise mortising to manufacturer specifications. Frame must be plumb and square for proper hinge operation and door alignment.
How fast can I get the SOSS 218US26D 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 218US26D come with a warranty?
Absolutely. The SOSS 218US26D 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 218US26D?
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 218US26D 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.

Product Reviews

  • 5
    Great Price & Quality

    Posted by Ashley Feldman on Jul 21st 2025

    Such quick shipping! Most affordable for a concealed hinge!

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