SOSS 418SSIC Invisible Closer Hinge, 316 Stainless Steel with Fire Rating
The SOSS 418SSIC Invisible Closer Hinge is engineered for doors 1-3/4" thick and constructed of complete 316 stainless steel for exceptional corrosion resistance and durability. This single action hinge opens a full 180° while remaining totally invisible from either side of the door when closed. The closure rate is completely adjustable with an allen wrench after installation, without requiring removal of the closer, and installation can be completed inside the door itself or inside the door jamb. Underwriters Laboratories labeled, the 418SSIC carries fire ratings of 20/90/180 Minute depending on door construction and material.
Key Features
- Door Thickness Compatibility: Designed for doors that are 1-3/4" thick, suitable for full-sized entry, metal, and wood applications.
- Product Size: Hinge measures 4-39/64" for accurate door and frame preparation.
- 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 and frames rated up to 20 minutes; and wood/plastic composite doors with Georgia Pacific FSI or FSII banding rated up to and including 90 minutes.
- Heavy-Duty Construction: Complete 316 stainless steel materials provide long-term strength and corrosion resistance for demanding commercial environments.
- Adjustable Closure Rate: Closure speed can be fine-tuned with an allen wrench after installation without removing the closer from the door.
- Full 180° Swing: Single action hinge design allows the door to open a complete 180 degrees.
- Invisible Design: Totally concealed from either side of the door when closed, preserving clean sightlines.
- Hardware Included: Wood and machine screws are included for straightforward installation.
Certifications & Compliance
- Underwriters Laboratories (UL) Labeled
- Fire Rating: 20/90/180 Minute
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 Finish: US32D - Satin Stainless Steel
- 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
- Multi-Tenant Residential Properties
- Government and Municipal Buildings
- Fire-Rated Door Assemblies
Why SOSS 418 Series?
SOSS 418 Series invisible closer hinges deliver professional-grade reliability through complete 316 stainless steel construction and Underwriters Laboratories fire door labeling up to 180 minutes depending on application. Engineered for demanding commercial applications where concealed hardware, adjustable closure performance, and fire-rated compliance are essential.
Manufacturer Resources
Product Specs
- Subcategory:
- Hinges and Pivots
- Product Group:
- Door Hinges and Pivots
- Product Type:
- Invisible Hinges
- Product Subgroup:
- Spring Hinges
- Commercial/Residential:
- Commercial
- Duty Level:
- Heavy Duty
- Electronic:
- No
- Corner Type:
- Radius
- Series:
- 418 Series
- Product Function:
- Spring Hinges
- Product Finish:
- US32D - Satin Stainless Steel
- Product Size:
- 4-39/64"
- Product Category:
- Door Hinges and Pivots
- Product Substrate:
- Stainless Steel
- Department:
- Door Hardware