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Hager BB1279 4-1/2" x 4-1/2" Full Mortise Ball Bearing Hinge
The Hager BB1279 is a commercial-grade Full Mortise Ball Bearing Hinge engineered for performance and architectural consistency. Designed for 1-3/4" thick doors, this 4.5" x 4.5" steel hinge is the industry standard for medium-weight doors in offices, schools, and retail spaces. Equipped with two precision ball bearings, the Hager BB1279 ensures a smooth, silent swing while preventing the common door sagging associated with high-traffic or heavier door leaves.
Engineered for Longevity and Smooth Operation
The BB1279 series is built to handle the mechanical stresses of modern commercial openings, especially those equipped with door closers.
- Dual Ball Bearings: Features two internal ball bearings that distribute vertical and lateral loads evenly, reducing friction and extending the life of the hinge and the door frame.
- High-Quality Steel Construction: Crafted from durable steel with a matching steel pin, providing a rigid pivot point for hollow metal and solid core wood doors.
- Non-Rising Removable Pin: Includes a button tip and plug design that keeps the pin securely seated during use but allows for easy removal when maintenance or door adjustments are required.
- Universal Fastener Pack: Every hinge is furnished standard with all wood screws (1-1/4" x 12 FPHW) and all machine screws (1/2" 12-24 FPHM) for seamless installation on any frame type.
Technical Specifications
| Feature | Details |
| Model | Hager BB1279 |
| Hinge Type | Full Mortise / Ball Bearing |
| Dimensions | 4-1/2" x 4-1/2" (114 mm x 114 mm) |
| Metal Thickness | .134 Gauge (Standard Weight) |
| Material | Steel with Steel Pin |
| Bearing Count | 2 Ball Bearings |
| ANSI Standard | Meets ANSI A8112 |
| Door Thickness | Standard 1-3/4" (44 mm) |
| Knuckles | 5-Knuckle Design |
| Pricing | Priced and Sold as "Each" |
Why Choose the Hager BB1279?
For contractors and facility managers, the Hager BB1279 represents a high-intent hardware choice that addresses both mechanical reliability and building code compliance. While plain bearing hinges are suitable for light use, the BB1279 ball bearing design is highly recommended for doors with closers to prevent premature wear. Its .134 gauge thickness provides the structural heft needed for 4-1/2" templates, making it a perfect drop-in replacement for existing commercial hardware.
Ideal Applications:
- Commercial Office Suites: Ensuring a smooth, high-end feel for entry and suite doors.
- Educational Facilities: Durable enough for medium-frequency hallway and classroom use.
- Retail Storefronts: Providing a reliable pivot for heavy wood or metal interior doors.
- Doors with Closers: Absorbing the force of automatic closing devices to maintain door alignment.
| General - US Finishes | US26D - Satin Chrome or US26 - Polished Chrome or L1 - Black or US15 - Satin Nickel or US3 - Polished Brass or US4 - Satin Brass or US10 - Satin Bronze or US10A - Oil Rubbed Bronze or US10B - Oil Rubbed Bronze or USP - Prime Painted |
| Brand | Hager |
| Hinge Height | 4.5" Hi |
| Hinge Width | 4.5" Wi |
| Hinge Grade/Thickness | Standard Wt .119 to .146 |
| Hinge Type | Full Mortise |
| Hinge Options | Ball Bearing |
| Base Material | Steel |
| Hinge Corners | Square |
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