SOSS 420 Series Invisible Hing...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$341.96
$270.67
SOSS SOSS 420 Series 4-1/2" Invisible Hinge (1-3/4" Minimum Door Thickness) 420

SOSS 420 Series Invisible Hinge with 3-Hour Fire Rating for 2" Minimum Metal Doors

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Model: 420US26D
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$341.96
$270.67
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SOSS 420 Series Invisible Hinge with 3-Hour Fire Rating for 2" Minimum Metal Doors

The SOSS 420 Series Invisible Hinge is a full size, 4-1/2" x 4-1/2" single action hinge engineered for metal applications with a minimum material thickness of 2". Constructed of alloy steel, the model #420 opens a full 180° and is Underwriters Laboratories labeled for use on hollow metal, sheet metal, tin clad, and steel composite swinging type fire doors and frames rated up to and including 3 hours (180 minutes), as well as wood core doors and frames rated up to 20 minutes. Designed for full sized entry applications in both metal and wood door construction, this heavy duty hinge delivers a flush fit, compact profile, and smooth operation for demanding commercial installations.

Key Features

  • Full Size Profile: 4-1/2" x 4-1/2" product size suited for full sized entry door applications.
  • Minimum Material Thickness: Designed for metal applications that are 2" thick, ensuring proper fit and function.
  • Fire Rating: UL labeled for use on hollow metal, sheet metal, tin clad, and steel composite swinging type fire doors and frames rated up to and including 3 hours (180 minutes), and wood core doors and frames rated up to 20 minutes.
  • Heavy Duty Alloy Steel Construction: Built from alloy steel for superior appearance and long-term durability in commercial environments.
  • Full 180° Single Action Operation: Opens a full 180° for smooth, reliable single action swinging performance.
  • Invisible Flush Fit Design: Compact, concealed hinge design provides a clean flush appearance where visible hardware is undesirable.
  • Machine Screws Included: Ships complete with machine screws for straightforward installation.
  • Fire-Rated Hinge Application Guidance: 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 calculation demands more hinges.

Certifications & Compliance

  • Underwriters Laboratories (UL) Labeled
  • Fire Rated up to 3 Hours (180 Minutes) on Metal Doors and Frames
  • Fire Rated up to 20 Minutes on Wood Core Doors and Frames

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: Square
  • Series: 420 Series
  • Product Size: 4-1/2" x 4-1/2"
  • Product Category: Door Hinges and Pivots
  • Department: Door Hardware
  • Application: Full Sized Entry, Metal, Wood
  • Min. Material Thickness: 2″
  • Fire Rating: 180 Minutes
  • Power Transfer: No
  • Closer: No
  • Counter Bored Screw Holes: No
  • Screws Included: 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 420?

SOSS 420 Series invisible hinges deliver professional-grade reliability with heavy duty alloy steel construction and a UL label supporting fire ratings up to 3 hours on metal doors and frames. Engineered for demanding commercial applications where a flush fit, compact size, and smooth 180° single action operation are essential, this hinge is a dependable choice for full sized entry doors in both metal and wood construction.

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:
Square
Series:
420 Series
Product Function:
Invisible Hinges
Product Size:
4-1/2"
Product Category:
Door Hinges and Pivots
Product Substrate:
Alloy Steel
Department:
Door Hardware

SOSS 420US26D – Frequently Asked Questions

How fast can I get the SOSS 420US26D 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 420US26D come with a warranty?
Absolutely. The SOSS 420US26D 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 420US26D?
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 420US26D 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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