SOSS 220SS Series 5-1/2" Invisible Hinge with 316 Stainless Steel Construction

SOSS 220SS Series 5-1/2" Invisible Hinge with 316 Stainless Steel Construction

The SOSS 220SS Invisible Hinge is engineered for wood or metal door applications with a 2" minimum material thickness, delivering a flush-fit, fully concealed hinge solution for full-sized entry doors. Constructed of complete 316 stainless steel, this 5-1/2" hinge is built for corrosion resistance, smooth single-action operation, and a full 180° opening range. The 220SS carries an Underwriters Laboratories label, supporting 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 rated up to 20 minutes, and wood/plastic composite doors and frames built with Georgia Pacific FS 1 or FS 2 banding rated up to and including 90 minutes.

Key Features

• Compact Concealed Design: 5-1/2" invisible hinge sized for doors and frames with a 2" minimum material thickness, ideal for exterior, full-sized entry applications in metal or wood.
• Full Range of Motion: Opens a full 180° as a single action hinge, providing smooth, reliable operation.
• Corrosion-Resistant Construction: Made of complete 316 stainless steel for long-term durability in demanding commercial environments.
• 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/frames rated up to 20 minutes, and wood/plastic composite doors/frames 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 installation flexibility across substrates.
• Application-Specific Hinge Count 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 requires more hinges.
• Heavy Duty Rated: Designed for commercial applications demanding dependable, long-service hardware performance.

Certifications & Compliance

• Underwriters Laboratories (UL) Labeled
• Fire Rated up to 3 Hours (Hollow Metal, Sheet Metal, Tin Clad, Steel Composite Doors/Frames)
• Fire Rated up to 20 Minutes (Wood Core Doors/Frames)
• Fire Rated up to 90 Minutes (Wood/Plastic Composite Doors/Frames with Georgia Pacific FS 1 or FS 2 Banding)

Technical Specifications

• Subcategory: Hinges and Pivots
• Product Group: Door Hinges and Pivots
• Product Subgroup: Concealed Hinges
• Commercial/Residential: Commercial
• Duty Level: Heavy Duty
• Electronic: No
• Corner Type: Radius
• Series: 220 Series
• Collection: 220 Series
• Product Size: 5-1/2"
• Product Category: Door Hinges and Pivots
• Department: Door Hardware
• Application: Exterior, Full Sized Entry, Metal, Wood
• Min. Material Thickness: 2″
• 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 220 Series?

SOSS 220 Series invisible hinges deliver professional-grade reliability with complete 316 stainless steel construction, offering corrosion resistance and smooth single-action operation rated for full 180° use. Backed by Underwriters Laboratories fire-door labeling across metal, wood core, and wood/plastic composite applications, the 220SS is engineered for demanding commercial installations where dependable, flush-fit hardware performance is essential.