SOSS 418 Series Invisible Hing...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$308.28
$238.00
SOSS SOSS 418 Series 4-5/8" Invisible Hinge (1-3/4" Minimum Door Thickness) 418

SOSS 418 Series Invisible Hinge, 4-5/8" Full Mortise Door Hinge for 1-3/4" Minimum Thickness Doors

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Model: 418US26D
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$308.28
$238.00
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SOSS 418 Series Invisible Hinge, 4-5/8" Full Mortise Door Hinge for 1-3/4" Minimum Thickness Doors

The SOSS 418 Series Invisible Hinge is a full-size, 4-5/8" door style hinge engineered for wood or metal door applications with a minimum material thickness of 1-3/4". Constructed of alloy steel, this hinge delivers a flush, concealed fit with compact size and smooth single-action operation, opening a full 180°. The model #418 carries an Underwriters Laboratories fire rating up to and including 3 hours (180 minutes) on hollow metal, sheet metal, tin clad, and steel composite swinging fire doors and frames, plus additional ratings for wood core and wood/plastic composite door and frame constructions.

Key Features

  • Full Size Application: Designed for wood or metal doors with 1-3/4" minimum material thickness for reliable full-size entry door installations.
  • Compact 4-5/8" Profile: Product size of 4-5/8" delivers a flush, invisible fit with compact dimensions and smooth operation.
  • Heavy-Duty Alloy Steel Construction: Built from alloy steel to provide superior appearance and durability in demanding commercial applications.
  • 180° Single-Action Operation: Opens a full 180° as a single action hinge for versatile door swing requirements.
  • Fire Rated Performance: UL labeled for use on hollow metal, sheet metal, tin clad, and steel composite fire doors and frames rated up to and including 3 hours; wood core doors and frames up to 20 minutes; and wood/plastic composite doors and frames constructed with Georgia Pacific FS 1 or FS 2 banding rated up to and including 90 minutes.
  • Hardware Included: Wood and machine screws are included for straightforward installation.
  • Fire Door Hinge Spacing 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 and including 3 hours on hollow metal, sheet metal, tin clad, and steel composite doors/frames
  • Fire Rated up to 20 minutes on wood core doors and frames
  • Fire Rated up to and including 90 minutes on wood/plastic composite doors and frames (Georgia Pacific FS 1 or FS 2 banding)

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: 418 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: 90 / 180 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 418?

SOSS 418 Series hinges combine alloy steel construction with a fire-rated design tested for use up to 3 hours on metal doors and frames, delivering the flush, invisible appearance and smooth 180° single-action operation that full-size entry doors demand. Engineered for commercial-grade wood and metal door applications where durability, compact fit, and code-compliant fire performance 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:
418 Series
Product Function:
Invisible Hinges
Product Size:
4-5/8"
Product Category:
Door Hinges and Pivots
Product Substrate:
Alloy Steel
Department:
Door Hardware

SOSS 418US26D – Frequently Asked Questions

1) What is the minimum door thickness required for the SOSS 416 invisible hinge?
The SOSS 416 requires a minimum door thickness of 1-3/8 inches. This measurement applies to both the door and frame material where the hinge will be mortised.
2) What door weight capacity does the SOSS 416 support?
Each SOSS 416 hinge supports up to 95 pounds. For heavier doors, use multiple hinges spaced according to manufacturer specifications.
3) Is the SOSS 416 handed for left or right swing doors?
The SOSS 416 is non-handed and works with both left-hand and right-hand swing doors. The same hinge can be installed for inswing or outswing applications.
4) What finish options are available for the SOSS 416?
The SOSS 416 comes in multiple finishes including satin stainless steel, bright stainless steel, and oil-rubbed bronze. Check product specifications for available finish options.
5) Where are invisible hinges typically used?
Invisible hinges are ideal for high-end residential doors, commercial applications, and architectural projects where visible hardware disrupts the design. Common uses include entry doors, interior doors, and cabinet applications.
6) What tools are needed to install the SOSS 416?
Installation requires a drill, router or chisel for mortising, measuring tools, and the manufacturer's template. Use the provided template for precise placement and mortise dimensions.
7) How deep must the mortise be cut for the SOSS 416?
Follow the manufacturer's template for exact mortise depth specifications. Precise mortising is critical for proper operation and door alignment with invisible hinges.
8) Can the SOSS 416 be adjusted after installation?
Limited adjustment is possible through the mounting screws. For major adjustments, the mortise may need modification. Proper initial installation reduces the need for later adjustments.
9) What door materials work with the SOSS 416?
The SOSS 416 works with solid wood, engineered wood, and composite doors that meet the minimum thickness requirement. Verify material density can support the mortise without compromising door integrity.
10) Are there other SOSS invisible hinge models for different applications?
SOSS offers multiple invisible hinge models with different weight capacities and dimensions. Browse our hinges section for other SOSS models and invisible hinge options.
11) What maintenance do invisible hinges require?
Periodically lubricate pivot points with light machine oil. Keep mortise areas clean of debris. Check mounting screws annually in high-use applications.
How fast can I get the SOSS 418US26D 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 418US26D come with a warranty?
Absolutely. The SOSS 418US26D 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 418US26D?
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 418US26D 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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