SOSS 418IC Invisible Closer Hinge with Fire Rating for 1-3/4" Doors

SOSS 418IC Invisible Closer Hinge with Fire Rating for 1-3/4" Doors

The SOSS 418IC Invisible Closer Hinge is engineered for most door types with a 1-3/4" minimum thickness, combining a fully concealed hinge with an integrated door closer that remains totally invisible from either side when the door is closed. Constructed of alloy steel materials, this heavy-duty hinge from the 418 Series opens a full 180° as a single-action hinge and features a closure rate that is completely adjustable with an allen wrench after installation, with no need to remove the closer. Underwriters Laboratories has labeled the model #418IC for use on hollow metal, sheet metal, tin clad, and steel composite swinging fire doors and frames rated up to and including three hours, on wood core doors and frames rated up to 20 minutes, and on wood/plastic composite doors constructed with Georgia Pacific FSI or FSII banding rated up to and including 90 minutes.

Key Features

• Minimum Material Thickness: Designed for doors with 1-3/4" minimum thickness for reliable fit and operation.
• Product Size: Measures 4-39/64" for standard invisible hinge preparation.
• Heavy-Duty Alloy Steel Construction: Built from alloy steel materials for long-term durability in commercial applications.
• Totally Invisible Design: The hinge and integrated closer remain completely hidden from either side when the door is closed, preserving clean door aesthetics.
• Adjustable Closure Rate: Closure speed can be fine-tuned with an allen wrench after installation without removing the closer.
• Full 180° Single-Action Operation: Allows the door to swing a complete 180 degrees for flexible use.
• Flexible Installation: Can be installed either inside the door itself or inside the door jamb.
• Fire Rating: UL labeled for use on hollow metal, sheet metal, tin clad, and steel composite fire doors and frames rated up to and including three hours, wood core doors rated up to 20 minutes, and wood/plastic composite doors with Georgia Pacific FSI or FSII banding rated up to and including 90 minutes.
• Screws Included: Wood and machine screws are included for installation.

Certifications & Compliance

• Underwriters Laboratories (UL) Labeled
• Fire Rating: 20/90/180 Minute per application per manufacturer specifications

Technical Specifications

• Subcategory: Hinges and Pivots
• Product Group: Door Hinges and Pivots
• Product Subgroup: Spring Hinges
• Commercial/Residential: Commercial
• Duty Level: Heavy Duty
• Electronic: No
• Corner Type: Radius
• Series: 418 Series
• Product Function: Spring Hinges
• Product Size: 4-39/64"
• Product Category: Door Hinges and Pivots
• Department: Door Hardware
• Application: Full Sized Entry, Metal, Wood
• Min. Material Thickness: 1-3/4″
• Fire Rating: 20/90/180 Minute
• Power Transfer: No
• Closer: Yes
• 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 418IC?

SOSS 418IC hinges are built from alloy steel for heavy-duty commercial performance and carry Underwriters Laboratories fire door labeling for demanding life-safety applications. With a fully concealed closer, adjustable closure rate, and full 180° single-action operation, the 418IC delivers professional-grade reliability for entry doors requiring both smooth operation and fire-rated protection.