Name: Don-Jo BB84545 Full Mortise Ball Bearing Hinge 4-1/2" x 4-1/2" Brass in Satin Chrome
Brand: Don-Jo
SKU: BB84545-626
Price: 71.9 USD
Availability: InStock

Product Overview
FAQs

Don-Jo BB84545 Full Mortise Ball Bearing Hinge 4-1/2" x 4-1/2" — Brass, Satin Chrome Finish

The Don-Jo BB84545 is a full mortise ball bearing hinge measuring 4-1/2" x 4-1/2", crafted from brass material and finished in Satin Chrome (626). Designed for medium weight doors with average frequency use, this commercial-grade hinge features a 5-knuckle construction with square corners and a 0.134 gauge for dependable, long-lasting performance. ANSI A2112 template compliance ensures straightforward installation on standard door preparations. A non-removable pin (NRP) option is also available — simply specify NRP as a prefix when ordering.

Key Features

Full Mortise Design: Engineered for clean, flush installation in standard mortise door and frame preparations for a professional finish.
4-1/2" x 4-1/2" Size: Ideal sizing for medium weight commercial doors, providing balanced support and smooth operation.
Ball Bearing Construction: Precision ball bearings deliver smooth, quiet operation and extended service life under average frequency use conditions.
Brass Material with Satin Chrome Finish (626): Durable brass construction with a Satin Chrome finish offers corrosion resistance and a refined aesthetic suited to commercial environments.
5-Knuckle Configuration: Five-knuckle design provides enhanced strength and stability for demanding commercial door applications.
0.134 Gauge: Standard duty gauge construction delivers reliable performance for medium weight door applications.
ANSI A2112 Template Compliance: Meets ANSI A2112 template standards for compatibility with industry-standard door preparations and simplified installation.
Non-Removable Pin Option: Available with a non-removable pin (NRP) for added security — specify NRP as a prefix when ordering.
Square Corners: Classic square corner style for compatibility with standard commercial door and frame preparations.

Certifications & Compliance

ANSI A2112 Template Compliant
Commercial Grade Application

Technical Specifications

Subcategory: Hinges
Product Group: Door Hinges and Pivots
Product Subgroup: Full Mortise Hinges
Product Type: Full Mortise Hinges
Commercial/Residential: Commercial
Corner Style: Square corners
Duty Level: Standard Duty
Knuckles: 5
Product Size: 4.5" x 4.5"
Product Category: Door Hinges and Pivots
Department: Door Hardware

Typical Applications

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

Why Don-Jo BB84545?

Don-Jo full mortise ball bearing hinges are built to commercial standards, combining brass construction with precision ball bearing technology for smooth, reliable door operation. The BB84545 meets ANSI A2112 template requirements and is available with a non-removable pin option, making it a versatile and security-conscious choice for professional door hardware installations where consistent performance is essential.

Manufacturer Resources

DON-JO Hinges

Product Specs

Subcategory:: Hinges
Product Group:: Door Hinges and Pivots
Product Subgroup:: Full Mortise Hinges
Product Type:: Full Mortise Hinges
Bearing Type:: Ball Bearing
Commercial/Residential:: Commercial
Corner Style:: Square corners
Duty Level:: Standard Duty
Knuckles:: 5
Product Model:: BB84545
Product Size:: 4.5" x 4.5"
Product Category:: Door Hinges and Pivots
Product Substrate:: Brass
Department:: Door Hardware

Don-Jo BB84545-626 – Frequently Asked Questions

1) Will a Don-Jo BB84545 hinge drop into an existing 4-1/2 x 4-1/2 square corner mortise on a commercial door and frame?

Yes, in the ordinary case. The BB84545 is a full mortise hinge at 4-1/2 inches by 4-1/2 inches with square corners, cut to the ANSI A2112 template, so it lands in a standard square corner commercial prep without rework. Two things to check on the door you are pulling from: that the existing leaf is square corner and not radius, and that the existing size really is 4-1/2 square rather than 4 x 4 or a wide throw leaf. If the old hinge has rounded corners the mortise will not accept a square corner leaf without chisel work.

2) Is the Don-Jo BB84545 ball bearing hinge heavy enough for a solid core commercial door on a closer?

The BB84545 is a standard duty hinge at 0.134 gauge, built for medium weight doors in average frequency openings. That covers most solid core wood and hollow metal office, classroom, and tenant doors on a normal closer. Where it is the wrong choice is a heavy door, a high traffic entrance cycling all day, or a lead lined or oversized leaf. For those, go heavy weight: the McKinney TCA3386 is a heavy weight 4-1/2 by 4-1/2 square corner 5 knuckle full mortise hinge, and the Stanley Security CB199 is a heavy weight full mortise concealed bearing hinge.

3) Do I need to order the Don-Jo BB84545 with NRP for an out-swinging exterior door?

Yes. On any door that swings out, the pin is on the unsecured side and can be driven out, so specify the non-removable pin version. The BB84545 is ordered two ways: standard, or NRP, which is called out as a prefix on the model. Inswinging interior doors do not need it. If your building standard is NRP on all exterior and stair doors, order the NRP version for those openings and standard for the rest, they are otherwise the same hinge.

4) I need power transfer to an electric lock through the hinge. Can the Don-Jo BB84545 do that?

No. The BB84545 is a mechanical hinge with no wire path through the barrel, so it cannot carry power to an electrified lock or exit device. For that opening use an electric through-wire hinge, such as the ACSI 5BB1, a 5 knuckle ball bearing full mortise hinge in the same 4-1/2 by 4-1/2 size with a concealed 4 wire 28 gauge through-wire. You typically use one through-wire hinge per door and standard hinges in the remaining positions, so the BB84545 still fills the other two.

5) My door needs to clear the frame for a wheelchair. Is the BB84545 the right hinge?

No, a standard butt hinge will not gain you clearance. The BB84545 mortises flush and leaves the door sitting in the opening, so the frame stop and the door thickness still eat into the clear width. To swing the door completely clear of the opening you need a swing clear hinge: the BEST CB248 is a full mortise concealed bearing swing clear hinge for square edge doors, and the Hager 1260 is a heavy duty full mortise swing clear hinge with a 5 knuckle plain bearing. Those are the ones that recover the couple of inches on a tight corridor door.

6) I am standardizing hinges across a building. Can the BB84545 replace mixed McKinney hinges we already have?

On like-for-like openings, yes. The BB84545 is a standard duty 4-1/2 by 4-1/2 square corner 5 knuckle full mortise hinge cut to ANSI A2112, which is the same size, corner, and knuckle count as the McKinney TCA2314 and TCA2317, both standard duty square corner 5 knuckle full mortise hinges at 4-1/2 by 4-1/2. That means the existing mortises take it. The one place to stop is a door already running a heavy weight hinge, like the McKinney TCA3386, since dropping to standard duty on a heavy leaf will show up as sag.

7) What is a direct equivalent to the Don-Jo BB84545 4-1/2 x 4-1/2 square corner hinge from another manufacturer?

The McKinney TCA2314 is the closest like-for-like: a square corner, 5 knuckle full mortise hinge in 4-1/2 by 4-1/2, rated standard duty, the same duty level the BB84545 carries. The McKinney TCA2317 is the same square corner, 5 knuckle, 4-1/2 by 4-1/2 standard duty configuration as well, so both drop into the same door and frame prep the Don-Jo does. Confirm the finish you need on whichever one you specify, since the Don-Jo is a brass hinge in Satin Chrome.

8) The door is heavier than standard weight - what hinge should I use instead of the BB84545?

Step up to a heavy weight hinge. The McKinney TCA3386 is a square corner, 5 knuckle full mortise hinge in the same 4-1/2 by 4-1/2 size but rated heavy duty, so it keeps the existing door and frame prep. If the opening needs pivot reinforcement, the Stanley Security CB199 is a full mortise concealed bearing heavy weight hinge, and the BEST CB223 is a stainless steel concealed bearing heavy weight pivot reinforced hinge for beveled edge doors. The BB84545 itself is a standard duty ball bearing hinge sized for medium weight commercial doors.

9) I need the door leaf to clear the opening for ADA width or a gurney - is the BB84545 the right hinge?

No, that calls for a swing clear hinge, which throws the door fully out of the opening when it swings. The BEST CB248 is a full mortise concealed bearing swing clear hinge for square edge doors, rated medium duty, and the Hager 1260 is a full mortise swing clear hinge with a 5 knuckle plain bearing design, rated heavy duty. The BB84545 is a conventional full mortise ball bearing hinge, so the leaf stays in the opening when the door is open.

10) The door has to clear trim or swing back against a wall - will the BB84545 give me enough throw?

Not on its own. The BB84545 is a 4-1/2 by 4-1/2 full mortise hinge, a standard throw. When the door has to clear projecting trim or swing further clear of the jamb, use a wide throw hinge: the Hager WTBB1168 is a 4-1/2 by 6 inch full mortise ball bearing wide throw hinge, heavy weight with 5 knuckles. The extra leaf width is what buys the clearance, and it also changes the frame leaf prep, so verify the frame before you order it.

11) What is the difference between a ball bearing hinge like the Don-Jo BB84545 and a plain bearing hinge?

Bearings are what keep the hinge quiet and square under a closer. The BB84545 carries ball bearings between the knuckles, which take the vertical load and let the door swing without the knuckle-on-knuckle wear that makes a door squeak and sag. Plain bearing hinges have no bearing race, they run metal on metal, and they belong on light doors with no closer, interior passage, closets, and residential work. Plain bearing options include the Hager 1279, a medium duty 5 knuckle full mortise commercial hinge, and the Hager 1541 for residential. If the door has a closer on it, stay with a bearing hinge.

12) Does the Don-Jo BB84545 hinge need to be handed, and will one part number work on both left and right doors?

No handing to specify. A full mortise butt hinge with a 5 knuckle barrel is symmetrical, so the same BB84545 goes on a left hand or right hand door, and the same hinge works whether the door swings in or out. That is why you can buy them by the box for a building and sort them at the openings. Handing only becomes a factor on hinges with a swing clear or beveled leaf, not on a standard square corner butt.

13) Will the Satin Chrome finish on the Don-Jo BB84545 match my 626 lever and closer hardware?

Yes. The BB84545 is finished 626 satin chrome, the same BHMA finish code specified on most commercial lever sets, exit devices, and cylinders, so it matches a building already standardized on 626. The base metal underneath is brass rather than steel. Satin chrome is the only finish this model is built in, so if an opening in your building is specified 630 satin stainless or 613 oil rubbed, you need a different hinge for that door.

14) How many BB84545 hinges do I need per door, and what else do I have to order to hang the door?

Three hinges per leaf is the standard count on a commercial door up to 7 feet 6 inches tall, four if the door runs taller. The BB84545 is a full mortise hinge, so both leaves mortise in, one into the door edge and one into the frame rabbet, and no separate pivot set or reinforcing is involved. Order by the opening: three per door for a typical 7 foot leaf, and match the NRP or standard choice across all hinges on the same door so the opening is consistent.

15) My door has to clear a deep trim or the wall behind it. Can I use a 4-1/2 x 4-1/2 hinge like the BB84545?

Only if the door sits in a normal frame. At 4-1/2 by 4-1/2 the leaves are square, which sets the door back at a standard throw and does not push it away from the frame face. If the door must swing past deep casing, a raised base, or a return wall, you need a wide throw hinge with a longer leaf: the Hager WTBB1168 is a 4-1/2 by 6 inch full mortise ball bearing wide throw hinge, heavy weight, 5 knuckles. Measure the obstruction before ordering, a wide throw leaf also needs a wider mortise in the frame.

16) What is a simpler alternative to a ball bearing hinge like the BB84545 on a low traffic door?

A plain bearing hinge covers a low frequency opening. The Hager 1279 is a full mortise plain bearing commercial hinge with 5 knuckles, rated medium duty, and the Hager 1541 is a full mortise plain bearing residential hinge in stainless steel with a 5 knuckle design. Both differ from the BB84545 in the bearing itself: the Don-Jo is a ball bearing hinge, which is what carries it through average frequency commercial use. Match the size and finish before you swap, and note the 1541 is a residential hinge rather than a commercial one.

17) My door has a beveled edge - can I use the BB84545?

The BB84545 is a square corner full mortise hinge, and the peers built specifically for edge condition call it out. The BEST CB223 is a stainless steel concealed bearing heavy weight pivot reinforced hinge for beveled edge doors, while the BEST FBB212 is a steel ball bearing heavy weight pivot reinforced hinge for square edge doors and the BEST CB248 swing clear hinge is also for square edge doors. Check the leaf edge condition on the door you are hanging and pick the hinge built for it.

18) Which hinges should I standardize on across a facility that already runs Don-Jo BB84545 hinges?

For openings that match, stay with the 4-1/2 by 4-1/2 square corner, 5 knuckle, standard duty ball bearing pattern the BB84545 sets; the McKinney TCA2314 and TCA2317 are square corner 5 knuckle full mortise hinges in the same 4-1/2 by 4-1/2 size and standard duty rating. Then hold two exceptions in the same size family: the McKinney TCA3386 in heavy duty for the heavier leaves, and the ACSI 5BB1, a 4-1/2 by 4-1/2 ball bearing full mortise hinge with concealed electric through-wire, for the electrified openings. That keeps one door prep across the building.

19) Is a brass hinge like the Don-Jo BB84545 OK for a healthcare or coastal building where steel hinges corrode?

Brass holds up where plated steel does not. The BB84545 is brass under the 626 satin chrome finish, which is a better base metal than steel for humid interiors, wash-down corridors, and buildings near salt air, and it is built as a commercial grade hinge for offices, schools, healthcare, retail, industrial, multi-tenant residential, and government work. For a fully exposed exterior opening taking direct weather, stainless is the tougher call, and the BEST CB223 is a stainless steel concealed bearing heavy weight pivot reinforced hinge for beveled edge doors.

How fast can I get the Don-Jo BB84545-626 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 Don-Jo BB84545-626 come with a warranty?

Absolutely. The Don-Jo BB84545-626 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 Don-Jo BB84545-626?

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 Don-Jo BB84545-626 from ZenSupply?

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Don-Jo BB84545 Full Mortise Ball Bearing Hinge 4-1/2" x 4-1/2" Brass in Satin Chrome

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