Overview
The Hager BB1279 US26D door hinge is a commercial-grade, full mortise hinge engineered for reliable performance in institutional and commercial applications. This 4.5″ x 4.5″ hinge features a five-knuckle design with dual ball bearings, making it ideal for medium-weight doors that experience regular use without extreme traffic demands.
Key Features
- Full mortise construction: both leaves mortised into door and frame
- Five-knuckle design with two ball bearings for smooth, durable operation
- Non-rising removable pin with button tip and plug for easy maintenance
- US26D satin chrome finish for corrosion resistance and professional appearance
- ANSI A8112 certified, UL listed for commercial and institutional use
- Steel construction with steel removable pin (ANSI A8112 standard weight)
Technical Specifications
- Height: 4.5 inches (4-1/2″)
- Width: 4.5 inches (4-1/2″)
- Finish: US26D (satin chrome)
- Knuckles: 5
- Bearing Type: Ball bearing (two bearings)
- Material: Steel with steel removable pin
- Pin Style: Non-rising removable with button tip
- Mounting Type: Full mortise (114 mm x 114 mm)
- Corner Style: Square corners
- Weight Class: Standard weight
- Certifications: ANSI A8112, UL listed
- Quantity Per Box: 3 units
- Quantity in This Lot: 2 units
Typical Applications
The BB1279 US26D is specified for use on medium-weight doors or doors requiring medium-frequency service in commercial and institutional settings. Common applications include office building entrances, institutional facilities, healthcare facilities, and other commercial openings where durability and low-maintenance operation are required. The ball bearing design ensures smooth swing action even with regular door closer use.
Compatibility & Replacements
Compatible With
- Standard hollow metal and wood door frames with mortise cut-outs
- Doors 1-3/8″ to 2-1/8″ thick (standard commercial door thickness)
- Standard wood and machine screw fastening
- Door closers and electromechanical locking devices (with proper bearing specification)
Replaces / Drop-In Replacement For
- Hager 1279 series hinges in equivalent size and finish
- Other ball bearing full mortise hinges with equivalent 4.5″ x 4.5″ dimensions and ANSI A8112 specification
Works With
- Standard commercial door hardware systems
- ADA-compliant door installations
- Electric hinge modifications (EMN, ETW, ETM options available from Hager)
- Commercial door closer systems requiring ball bearing hinges
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