Hager BB1279 Full Mortise Ball...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$22.42
$9.51
Hager Hager BB1279 Full Mortise Ball Bearing Hinge, Standard Weight, Steel, 5 Knuckle, 8 - Gauge Wires HAG-BB1279

Hager BB1279 Full Mortise Ball Bearing Hinge with 5 Knuckle Design

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Model: BB1279-4.5X4.5-US26D
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Hager BB1279 Full Mortise Ball Bearing Hinge with 5 Knuckle Design

Commercial-Grade Full Mortise Hinge Solution

The Hager BB1279 Full Mortise Ball Bearing Hinge delivers professional-grade performance for medium weight doors requiring medium frequency service. This 5-knuckle hinge features dual ball bearings and steel construction with steel pin for reliable operation. ANSI A8112 certified and NFPA80 compliant for fire rated door assemblies, ensuring code compliance in commercial applications.

Professional Features & Benefits

  • Dual Ball Bearing Design: Two ball bearings provide smooth operation and extended service life for medium duty applications.
  • 5-Knuckle Construction: Five knuckle design offers enhanced strength and stability for commercial door installations.
  • Non-Rising Removable Pin: Features button tip and plug design for easy maintenance and service access when needed.
  • Steel Construction: Steel leaves with steel pin provide durability and strength for demanding commercial environments.
  • Fire Rating Compliance: Meets NFPA80 requirements for use on fire rated door assemblies ensuring life safety code compliance.
  • ANSI Certification: ANSI A8112 certified for quality assurance and specification compliance in commercial projects.
  • Reversible Hole Pattern: Available with reversible hole pattern option for flexible installation requirements.
  • Multiple Finish Options: Available in USP, US3, US4, US10, US10A, US10B, and US26D finishes to match project specifications.
  • Two ball bearings. Non-rising removable pin with button tip and plug.

Technical Specifications

  • ANSI/BHMA: ANSIA8112
  • Applications: For use on medium weight doors or doors requiring medium frequency service.
  • Bearing Type: Ball Bearing
  • Certifications: ANSI A8112
  • Commercial/Residential: Commercial
  • Duty Level: Medium Duty
  • Electric Modifications: EMN (Electric Monitor Only), ETW (Electric Through-Wire Only), ETM (Electric Through-Wire with Monitoring), Quick Connect
  • Electronic: No
  • Features: Two ball bearings. Non-rising removable pin with button tip and plug.
  • Finishes: USP, US3, US4, US10, US10A, US10B, US26D
  • Fire Rating: Complies with NFPA80 requirements for use on fire rated door assemblies.
  • Knuckles: Features: Two ball bearings. Non-rising removable pin with button tip and plug.
  • Material: Steel with Steel Pin.
  • Notes: Available with reversible hole pattern.
  • Options: 3-1/2" x 3-1/2" (89 mm x 89 mm) available with reversible hole pattern.
  • Series: BB1279
  • Subcategory: Full Mortise Hinges

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness, stile width, and handing as applicable to this product.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces.
  3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions.
  4. Install all mounting hardware and secure the device to door and frame per manufacturer torque specifications.
  5. Adjust operational components for proper alignment, latching, and smooth operation throughout the full range of motion.
  6. Test device operation to verify proper function and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Fire Rating Compliance

This hinge complies with NFPA80 requirements for use on fire rated door assemblies, making it suitable for applications where fire safety codes require certified hardware components for life safety compliance.

Why Choose Hager Quality?

Hager commercial hinges are manufactured in accordance with ANSI/BHMA A156.1 standards, delivering professional-grade reliability with steel construction and dual ball bearing design. ANSI A8112 certification and NFPA80 fire rating compliance ensure dependable performance in demanding commercial applications where code compliance and operational reliability are essential.

Full mortise commercial hinge engineered to meet or exceed ANSI standards for door weight, frequency of use, and finish durability.

Product Specs

Subcategory:
Full Mortise Hinges
Knuckles:
5
Product Group:
Door Hinges and Pivots
Product Subgroup:
Full Mortise Hinges
Product Type:
Full Mortise Hinges
Features:
Two ball bearings. Non-rising removable pin with button tip and plug.
ANSI/BHMA:
ANSI A8112
Series:
BB1279
Duty Level:
Medium Duty
Bearing Type:
Ball Bearing
Commercial/Residential:
Commercial
Electronic:
No
Product Category:
Door Hinges and Pivots
Product Substrate:
Steel
Department:
Door Hardware

Hager BB1279-4.5X4.5-US26D – Frequently Asked Questions

1) Can the Hager BB1279 be used on a fire rated door assembly?
Yes. The BB1279 complies with NFPA80 requirements for use on fire rated door assemblies, and it is built steel leaf with a steel pin, which is what a labeled opening calls for. It carries the ANSI A8112 designation, so a specifier can write that code directly on the hardware schedule and a plan reviewer can match it. Ball bearing construction with two bearings is also what a fire door with a closer on it needs, since the closer loads every hinge on the leaf.
2) I need to run power through the door for an electrified lock. Does the Hager BB1279 come as an electric hinge?
It does, and you have to call the modification out when you order. Four are offered: EMN, electric monitor only, which reports door position back to the panel; ETW, electric through wire only, which carries power across the gap to an electrified lock or exit device; ETM, through wire with monitoring, which does both on one hinge; and Quick Connect. One electric hinge per leaf is normal, with the rest of the hinges standard. Hager publishes separate installation instructions for the electric versions. If you want a ready made through wire hinge instead, the ACSI 5BB1 is a 4-1/2 x 4-1/2 five knuckle ball bearing full mortise hinge with concealed electric through wire, 4 wire at 28ga.
3) Is the pin on the Hager BB1279 removable, and is that a problem on an exterior out-swinging door?
The pin is a non-rising removable pin with a button tip and plug, so it pulls out for service. On an in-swinging door the barrel is on the secure side and that is fine. On an out-swinging exterior door the barrel sits outside, and a removable pin there means someone can drive the pin and lift the leaf off. For those openings specify a hinge with a non-removable pin feature, usually a set screw in the barrel that seats against the pin, or a security stud that keys the two leaves together when the door is closed. It is a change to how you order the hinge, not something you add in the field.
4) What size Hager BB1279 hinge do I need for a standard 1-3/4 inch commercial door?
The BB1279 runs in eleven sizes: 3-1/2 x 3-1/2, 4 x 3-1/2, 4 x 4, 4-1/2 x 4, 4-1/2 x 4-1/2, 5 x 4, 5 x 4-1/2, 5 x 5, 6 x 4-1/2, 6 x 5 and 6 x 6. Sizes read height first, then open width. For a 1-3/4 inch door up to about 36 inches wide, 4-1/2 x 4-1/2 is the usual commercial pick. Go taller (5 inch or 6 inch) as the leaf gets wider or heavier, since height is what spreads the load. Go wider only when you need extra throw, meaning a thicker door or deep frame trim that the door has to clear when it swings back. Hager also publishes a hinge size option chart for working this out.
5) Will a Hager BB1279 drop into the existing hinge prep when I replace worn hinges on a commercial door?
In most cases yes, if you match the size. The BB1279 is a full mortise hinge, meaning both leaves mortise into the door edge and the frame rabbet, and it is offered in 4-1/2 x 4-1/2, which is the size the majority of commercial openings were prepped for. Pull one of the old hinges, measure it open and flat (height by full open width), and order the matching size. The one thing to check before you order is the corner: the leaf corners and the existing mortise have to agree, square to square or radius to radius, or the new leaf will not sit in the pocket. Equivalent replacements in the same 4-1/2 x 4-1/2 five knuckle full mortise pattern include the McKinney TCA2314 and TCA2317 and the Don-Jo BB74545.
6) The door is heavier than a medium duty hinge should carry - what heavy weight hinge do I use instead of the Hager BB1279?
The Hager BB1279 is rated medium duty and is intended for medium weight doors or doors requiring medium frequency service, so a heavy or high-frequency leaf calls for a different part. The McKinney TCA3386 is the closest heavy weight match in the same format: a square corner 5 knuckle full mortise hinge at 4-1/2 by 4-1/2, heavy weight, heavy duty. The CB199 full mortise concealed bearing heavy weight hinge is a heavy duty option if the specification allows a concealed bearing, and the BEST CB223 is a stainless steel concealed bearing heavy weight hinge, though it is pivot reinforced and built for beveled edge doors, which is a different prep.
7) What is the closest equivalent to the Hager BB1279 in a 4-1/2 inch by 4-1/2 inch steel five knuckle ball bearing hinge?
The Hager BB1279 is a full mortise ball bearing hinge with a 5 knuckle design, steel leaves and a steel pin, rated medium duty, and it is offered in a 4-1/2 inch by 4-1/2 inch size. The nearest same-format parts at that size are the Don-Jo BB74545, a steel square corner 5-knuckle full mortise ball bearing hinge at 4-1/2 by 4-1/2 in standard duty, and the McKinney TCA2314 and TCA2317, square corner 5 knuckle full mortise hinges at 4-1/2 by 4-1/2, both standard duty. All three keep the five knuckle full mortise format, so the swap comes down to confirming corner style and hole pattern against the frame prep you already have.
8) Is a swing clear hinge like the BEST CB248 a substitute for the Hager BB1279?
No - they do the same mortise job but produce a different opening. The Hager BB1279 is a standard full mortise ball bearing hinge, medium duty, and the door leaf stays within the opening when the door swings. The BEST CB248 is a full mortise concealed bearing swing clear hinge for square edge doors, also medium duty; swing clear geometry carries the door out of the opening so the leaf no longer eats into the clear width, which is why it gets specified on corridors and patient room doors where clear width is being chased. Order the CB248 only when clear width is the reason; on an ordinary opening it changes how the door sits against the stop.
9) What finishes does the Hager BB1279 hinge come in, and can I match the hinges already on my other doors?
Twelve finishes are offered on the BB1279: 600 primed for painting, 605 bright brass, 606 satin brass, 612 satin bronze, 613 satin bronze oil-rubbed, 619 satin nickel, 625 bright chrome, 626 satin chrome, H2H mechanical galvanized, L1 flat black, LS Luma Sheen and US10A antique bronze. If you are matching a fleet of existing openings, read the number stamped on an existing hinge leaf or on the lock and order the same one; 626 satin chrome and 630 stainless hardware are the two most common in commercial buildings, and 626 is the match here. For painted hollow metal frames, 600 comes primed so it finishes with the frame. H2H mechanical galvanized is the one to use where the opening sees weather.
10) Ball bearing or concealed bearing hinge, which one should I be buying?
It comes down to what you want visible in the barrel. The BB1279 is a ball bearing hinge with two bearings sitting between the knuckles, so you see the bearing races in the barrel; that is the standard commercial build and it is what most schedules call for. A concealed bearing hinge hides the bearing inside the knuckle for an unbroken barrel, which architects specify on visible openings in lobbies and public spaces. At the same medium duty level, the BEST 1900R is a steel full mortise concealed bearing standard weight hinge with a removable pin, and the Stanley Security CB1960R is a concealed bearing standard weight full mortise hinge. Load capacity is not the deciding factor between them; appearance and the spec are.
11) Is a steel Hager BB1279 hinge alright on an exterior door, or do I need stainless?
The BB1279 is steel with a steel pin, so on a covered exterior opening in a dry climate it will hold up, and the H2H mechanical galvanized finish is the one to order for weather exposure. Where the door sees salt air, pool chemicals, or regular washdown, steel is the wrong base metal and plating will not save it. Go to a solid corrosion resistant hinge instead: the Don-Jo BB94545 is a stainless steel full mortise ball bearing hinge, 4-1/2 x 4-1/2 square corner, and the Don-Jo BB84545 is the brass version of the same size in satin chrome.
12) I need more clear opening width in a hospital corridor. Will a BB1279 get the door out of the way?
It will not. The BB1279 is a conventional full mortise hinge, so the open door leaf still sits in the opening and eats roughly the thickness of the door plus the trim off your clear width. When a wheelchair or a gurney has to pass, use a swing clear hinge, which carries the leaf clear of the opening at 90 degrees and gives you back that width. The BEST CB248 is a steel full mortise concealed bearing swing clear hinge for square edge doors at the same medium duty level. Swing clear hinges are prepped differently from standard hinges, so decide before the frames are ordered.
13) The specification calls for a concealed bearing hinge - what takes the place of the Hager BB1279?
The Hager BB1279 carries two ball bearings with a non-rising removable pin with button tip and plug, so the bearings are part of the knuckle stack rather than concealed. For a concealed bearing hinge at the same medium duty rating, the BEST 1900R is a steel full mortise concealed bearing standard weight hinge with a removable pin, and the Stanley Security CB1960R is a full mortise concealed bearing standard weight hinge, both medium duty. If the same opening also needs heavy weight, the CB199 is the concealed bearing heavy duty version.
14) I need power transfer through the hinge - do I order the Hager BB1279 with an electric option or buy a different hinge?
Both routes exist. The Hager BB1279 can be ordered with electric modifications: EMN for monitoring only, ETW for through-wire only, ETM for through-wire with monitoring, and Quick Connect. If you would rather buy a hinge already built as a through-wire, the ACSI 5BB1 is a 5 knuckle ball bearing full mortise hinge at 4-1/2 by 4-1/2 with concealed electric through-wire in a 4 wire, 28 gauge configuration. The practical difference is scope: the ACSI part is a fixed 4 wire through-wire, while the BB1279 electric range includes a monitor-only version for door position monitoring without running power to the lock.
15) Does the Hager BB1279 come with a reversible hole pattern?
A reversible hole pattern is offered on the BB1279, and it is called out specifically on the 3-1/2 x 3-1/2 size (89 mm x 89 mm). That matters on a retrofit: a reversible pattern lets the same hinge leaf serve a left hand or right hand opening without the screw holes landing off the existing prep, so one part covers both hands on a building where the doors run both ways. Ask for it by name when you order; it is a pattern option, not the default drilling.
16) The hinges already on the building are satin chrome - can I stay with the Hager BB1279 or do I need a different brand to match?
The Hager BB1279 is offered in 626 Satin Chrome, so it matches without changing brands. Its finish range also covers 600 primed for painting, 605 bright brass, 606 satin brass, 612 satin bronze, 613 satin bronze oil-rubbed, 619 satin nickel, 625 bright chrome, H2H mechanical galvanized, L1 flat black, LS Luma Sheen and US10A antique bronze, which is what makes it workable when one property has several finish schedules running at once. If part of the order has to come from elsewhere in satin chrome, the Don-Jo BB74540 at 4-1/2 by 4 and the Don-Jo BB84545 brass at 4-1/2 by 4-1/2 are both offered in that finish.
How fast can I get the Hager BB1279-4.5X4.5-US26D delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Hager BB1279-4.5X4.5-US26D come with a warranty?
Absolutely. The Hager BB1279-4.5X4.5-US26D is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Hager BB1279-4.5X4.5-US26D?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Hager BB1279-4.5X4.5-US26D from ZenSupply?
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Product Reviews

  • 5
    Hager Hinges

    Posted by Troy Smith on May 7th 2025

    Zen has a wide variety of hardware at a good price with quick shipping. The hinge is exactly what was needed.

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