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Hager BB1279 4.0" x 4.0" Full Mortise - Ball Bearing Hinge, Steel with Plated Finish
The Hager BB1279 4" x 4" is a professional-grade Full Mortise Ball Bearing Hinge designed for medium-weight doors in commercial and high-end residential settings. Engineered for 1-3/4" thick doors, this steel hinge features two precision ball bearings that significantly reduce friction, providing a smooth, silent swing even on doors equipped with automatic closers. Meeting the rigorous ANSI A8112 standard, the BB1279 is a reliable solution for openings requiring medium-frequency service and architectural durability.
Engineered for Smooth Operation and Fire Safety
Unlike plain bearing hinges, the Hager BB1279 is purpose-built to handle the vertical and lateral loads of modern commercial doors.
- Dual Ball Bearings: Equipped with two internal ball bearings that prevent metal-on-metal wear, ensuring the door remains easy to operate over thousands of cycles.
- Fire-Rated Compliance: This hinge complies with NFPA80 requirements, making it suitable for use on UL Fire Rated door assemblies (3-hour fire rating for hollow metal doors).
- Non-Rising Removable Pin: Features a specialized pin with a button tip and plug that stays seated during use but is easily removable for maintenance or door hanging.
- Plated Finishes: Available in a variety of architectural finishes to match your existing hardware, providing a professional and consistent aesthetic throughout your facility.
Technical Specifications
Feature | Details |
| Model | Hager BB1279 |
| Hinge Type | Full Mortise / Ball Bearing |
| Dimensions | 4.0" x 4.0" (102 mm x 102 mm) |
| Metal Thickness | .129 Gauge (Standard Weight) |
| Material | Steel with Steel Pin |
| Bearing Count | 2 Ball Bearings |
| ANSI Standard | ANSI A8112 |
| Door Thickness | Standard 1-3/4" (44 mm) |
| Knuckles | 5-Knuckle Design |
| Corners | Square Corners |
Hardware & Mounting Details
| Component | Fastener Type |
| Wood Screws | 1-1/4" x 12 FPHW (All included) |
| Machine Screws | 1/2" 12-24 FPHM (All included) |
| Packaging | Sold individually with complete fastener pack |
Why Choose the Hager BB1279?
For contractors and facility managers, the Hager BB1279 is a high-intent hardware choice that addresses both mechanical performance and life-safety codes. Its ball-bearing construction is required for doors with closers, as it prevents the accelerated wear caused by the tension of the closing arm. Whether you are installing new hollow metal doors or retrofitting wood doors in an office complex, Hager’s legacy of American-engineered quality ensures your hardware will perform reliably year after year.
Ideal Applications:
- Commercial Office Doors: Providing a smooth, professional feel for suite entries.
- UL Fire Rated Openings: Meeting building codes for fire-safety compliance.
- Doors with Closers: Preventing hinge binding and door sagging under tension.
- School and Healthcare Facilities: Durable enough for medium-frequency public use.
| General - US Finishes | US26D - Satin Chrome or US15 - Satin Nickel or US10B - Oil Rubbed Bronze |
| Brand | Hager |
| Hinge Height | 4.0" Hi |
| Hinge Width | 4.0" 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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