Don-Jo BB74540 Full Mortise Ba...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$38.06
$33.42
Don-Jo BB74540 Full Mortise Ball Bearing Hinge 4-1/2" x 4" in Satin Chrome

Don-Jo BB74540 Full Mortise Ball Bearing Hinge 4-1/2" x 4" in Satin Chrome

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Model: BB74540-652

In Stock (leaves warehouse same day if ordered before 3pm ET)

$38.06
$33.42
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Don-Jo BB74540 Full Mortise Ball Bearing Hinge 4-1/2" x 4" in Satin Chrome

The Don-Jo BB74540 is a full mortise ball bearing hinge measuring 4-1/2" x 4" and finished in Satin Chrome (Finish 652), engineered for medium weight doors in commercial applications. Constructed from steel at a 0.134 gauge, this hinge features a 5-knuckle design with square corners and is built to ANSI A8112 template standards for reliable, code-compliant installation. Designed for average frequency use, the BB74540 delivers consistent, smooth operation in standard duty commercial door applications.

Key Features

  • Full Mortise Design: Full mortise installation provides a clean, flush fit within the door and frame for a professional appearance and secure mounting.
  • Hinge Size: 4-1/2" x 4" dimensions are suited for medium weight commercial doors requiring reliable, balanced support.
  • Ball Bearing Construction: Ball bearing pivot points deliver smooth, consistent operation and reduced wear over the life of the hinge.
  • Steel Construction at 0.134 Gauge: Heavy-gauge steel body provides structural integrity and durability for standard duty commercial use.
  • 5-Knuckle Configuration: Five-knuckle design enhances strength and stability throughout the full range of door swing.
  • Square Corner Style: Square corners ensure compatibility with standard commercial door and frame preparations for straightforward installation.
  • ANSI A8112 Template Compliance: Manufactured to ANSI A8112 template specifications for consistent hole patterns and broad compatibility with commercial door hardware.
  • Satin Chrome Finish (652): Satin Chrome finish offers a clean, contemporary aesthetic with corrosion resistance suitable for commercial environments.

Certifications & Compliance

  • ANSI A8112 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"
  • 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 BB74540?

Don-Jo full mortise ball bearing hinges are built to ANSI A8112 template standards using 0.134 gauge steel construction, ensuring consistent performance and compatibility across a wide range of commercial door applications. The BB74540's ball bearing design and 5-knuckle configuration deliver smooth, dependable operation for medium weight doors in standard duty commercial environments where reliable, long-lasting hardware 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:
BB74540
Product Size:
4.5" x 4"
Product Category:
Door Hinges and Pivots
Product Substrate:
Steel
Department:
Door Hardware

Don-Jo BB74540-652 – Frequently Asked Questions

1) Is a 4-1/2 x 4 hinge the same as the 4-1/2 x 4-1/2 hinges on my other doors?
No. The BB74540 measures 4-1/2 x 4 inches, meaning the leaves are 4 inches across the open pair rather than 4-1/2. The 4-1/2 inch dimension is the height, so it matches the same hinge backset and screw pattern height, but the narrower leaf gives less clearance for the door to swing past trim. If you are matching a building already standardized on 4-1/2 x 4-1/2, order that size instead. Squared 4-1/2 x 4-1/2 options we carry include the McKinney TCA2314 and TCA2317 in standard weight.
2) Is the Don-Jo BB74540 heavy enough for a solid core or hollow metal door with a closer?
The BB74540 is a standard duty hinge built for medium weight doors, using 0.134 gauge steel with five knuckles. That covers ordinary commercial openings, office doors, classroom doors, tenant entries. For a heavy or oversized door, a high-abuse opening, or a heavy exterior door on a closer, step up to heavy weight, for example the McKinney TCA3386 in 4-1/2 by 4-1/2 or the Stanley Security CB199.
3) Can I use a plain bearing hinge instead of a ball bearing hinge on a commercial door?
They are not the same part. The Don-Jo BB74540 uses ball bearing pivot points, which is what carries frequent-cycle commercial traffic without the knuckle wearing. Hager's plain bearing hinges are the simpler alternative: 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 hinge with stainless steel construction and a 5 knuckle design built for residential use. A plain bearing hinge has no bearing race between the knuckles, so it suits low-cycle openings such as closets, interior apartment doors, and utility rooms. On an entry, corridor, or restroom door that swings all day, the ball bearing BB74540 is the one specified.
4) The door has to clear a deep trim casing when it swings back - is a standard 4-1/2 x 4 hinge enough?
No. When the door must swing clear of deep casing, applied molding, or a projecting frame, you need extra throw, and that comes from a wider hinge leaf rather than a taller one. The Hager WTBB1168 is a 4-1/2 by 6 inch full mortise ball bearing wide throw hinge, heavy weight, with 5 knuckles - the 6 inch width pushes the door further off the frame as it opens. The Don-Jo BB74540 is a 4-1/2 by 4 inch full mortise ball bearing hinge with 5 knuckles, which is the standard width for a door that swings back against a flush frame. Measure the projection of the obstruction before ordering; a wide throw hinge also needs a wider mortise on both the door and frame leaf.
5) I need to run power through the door for an electric lock - can I use a Don-Jo BB74540?
No. The BB74540 is a mechanical full mortise ball bearing hinge with no wiring path through the barrel. For a powered latch, electric strike at the door, or a request-to-exit switch in the lock, use an electric through-wire hinge: the ACSI 5BB1 is a 5 knuckle ball bearing full mortise hinge, 4-1/2 by 4-1/2 inches, with a concealed electric through-wire carrying 4 wires at 28 gauge, from the 1100 Series. Typical practice is one through-wire hinge per opening with the remaining hinges mechanical, so a BB74540 can still carry the other positions if the leaf sizes are matched - the ACSI hinge is 4-1/2 by 4-1/2 while the BB74540 is 4-1/2 by 4.
6) What is the closest equivalent to a Don-Jo BB74540 ball bearing hinge from McKinney?
The McKinney TCA2314 is the nearest match. It is a square corner, 5 knuckle full mortise hinge in standard duty, measuring 4-1/2 by 4-1/2 inches. The Don-Jo BB74540 is also a 5 knuckle square corner full mortise hinge rated standard duty, but its leaf size is 4-1/2 by 4 inches. Confirm the door leaf width before swapping - a 4-1/2 by 4-1/2 hinge needs a deeper mortise on the frame leaf than a 4-1/2 by 4 does, so an existing BB74540 prep will not accept the TCA2314 without rework. McKinney also offers the TCA2317 in the same square corner, 5 knuckle, standard duty, 4-1/2 by 4-1/2 configuration.
7) The door is sagging and the hinges keep wearing out - what heavier hinge should replace a standard duty ball bearing hinge?
Step up to a heavy weight hinge. The McKinney TCA3386 is a square corner, 5 knuckle full mortise hinge at 4-1/2 by 4-1/2 inches rated heavy duty, which keeps the same square corner full mortise prep family. 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 Don-Jo BB74540 is a standard duty ball bearing hinge at 4-1/2 by 4 inches, sized for medium weight doors, so on a high traffic or oversized leaf the heavy weight bodies carry more load. Match the door edge first: the CB223 is prepped for beveled edge doors, not square edge.
8) How many hinges do I need per door with the Don-Jo BB74540?
Standard practice is three hinges for a door up to 7 feet 6 inches, and one more for each additional 30 inches of height. The BB74540 is sold as a single hinge in 4-1/2 x 4 inch, so order three per typical commercial opening. All three carry the same square corner ANSI A8112 prep, so they are interchangeable top to bottom on the door.
9) Does the BB74540 hinge have to be ordered left hand or right hand?
No handing to specify. A full mortise butt hinge like the BB74540 is symmetrical, so the same hinge works on a left hand or right hand door. You just flip it. Handing only becomes a factor on hinges with a directional feature, and this one has none.
10) Will Satin Chrome 652 hinges match the 626 satin chrome lever sets already on my doors?
They read as a match. The BB74540 is finished Satin Chrome, finish number 652, which is the satin chrome plated finish applied over steel, while 626 is satin chrome over brass or bronze and is the common designation on locksets and levers. Side by side on the same opening the color is the standard pairing you see specified across commercial buildings.
11) Is the Don-Jo BB74540 steel or stainless steel, and can I use it on an exterior door?
Steel, at 0.134 gauge, with a Satin Chrome plated finish that gives corrosion resistance for commercial interiors and protected exteriors. For a fully exposed exterior door, a coastal site, a pool room, or a wash-down area, plated steel is the wrong substrate and you want stainless, for example the BEST CB223 in stainless steel or the Hager 1541 in stainless.
12) Can I standardize a whole building on the BB74540 across offices, classrooms, and tenant doors?
That is what it is built for. The BB74540 is a commercial hinge on the ANSI A8112 template, so the hole pattern is consistent from door to door and one part number covers the openings. Where you will have to break from it: doors needing full clear width for accessibility, doors carrying an electrified lock, heavy or oversized doors, and doors that must swing past deep trim. Everything else on a medium weight standard duty opening takes the same hinge.
13) What is the difference between a concealed bearing hinge and the Don-Jo BB74540 ball bearing hinge?
Both are full mortise commercial hinges; the difference is whether the bearing is visible in the knuckle stack. The Don-Jo BB74540 is a ball bearing hinge in steel with a 5 knuckle barrel, so the bearing races show as bands between the knuckles. Concealed bearing hinges hide the bearing inside the barrel for a smooth uninterrupted knuckle line: the BEST 1900R is a steel full mortise concealed bearing standard weight hinge with a removable pin, rated medium duty, and the Stanley Security CB1960R is a full mortise concealed bearing standard weight hinge, also medium duty. Function is comparable on a standard weight opening; architects specify concealed bearing when the exposed bearing bands are not wanted on a visible door.
14) My door has a beveled edge - will a square corner full mortise hinge work?
Match the hinge to the door edge, not just the leaf size. The BEST CB223 is a stainless steel concealed bearing heavy weight pivot reinforced hinge specified for beveled edge doors, while the BEST CB248 swing clear hinge and the BEST FBB212 ball bearing pivot reinforced hinge are both specified for square edge doors. The Don-Jo BB74540 is a full mortise ball bearing hinge with square corners at 4-1/2 by 4 inches, built to ANSI A8112 template for standard commercial door and frame preparations. Check the existing door edge before ordering - a hinge prepped for one edge condition will not sit flush on the other.
15) What is a pivot reinforced hinge and do I need one instead of a standard ball bearing hinge?
A pivot reinforced hinge adds a reinforcing element at the pivot point so the hinge resists the leverage of a heavy or high-abuse door better than a conventional barrel alone. The BEST FBB212 is a steel ball bearing pivot reinforced hinge for square edge doors, rated standard duty, and the BEST CB223 is a stainless steel concealed bearing pivot reinforced hinge, heavy duty, for beveled edge doors. The Don-Jo BB74540 is a conventional full mortise ball bearing hinge in steel, 4-1/2 by 4 inches, standard duty, for medium weight commercial doors. Choose by the door: pivot reinforced belongs on wide, heavy, or heavily abused leaves such as stairwell and dock doors, and you must specify square edge or beveled edge to match the door.
16) Which hinges use stainless steel instead of steel for a wet or coastal environment?
Two in the comparable range are stainless. The BEST CB223 is a stainless steel concealed bearing heavy weight pivot reinforced hinge for beveled edge doors, and the Hager 1541 is a full mortise plain bearing hinge with stainless steel construction and a 5 knuckle design, built for residential openings. The Don-Jo BB74540 is a steel full mortise ball bearing hinge in Satin Chrome finish 652 with square corners. For pool rooms, kitchens, car washes, and salt-air exteriors, a stainless body resists corrosion at the knuckle better than a plated steel body; for dry interior commercial openings the steel BB74540 is the usual specification.
17) Which of these hinges has a removable pin, and does the Don-Jo BB74540 pin come out?
The BEST 1900R is named as a steel full mortise concealed bearing standard weight hinge with a removable pin, rated medium duty. A removable pin lets the door be lifted off without unscrewing the leaves, which is how maintenance crews pull doors for painting, glass replacement, or moving furniture through a corridor. The Don-Jo BB74540 is a 5 knuckle steel ball bearing full mortise hinge at 4-1/2 by 4 inches. If pulling doors quickly matters on your property - apartment turns, hotel rooms, hospital rooms - specify the pin type when you order, because on an out-swinging exterior door a removable pin also has a security consequence.
18) I am standardizing hinges across a whole building - which of these are the same standard duty class as the Don-Jo BB74540?
Three peers share the standard duty rating: the McKinney TCA2314 and McKinney TCA2317, both square corner 5 knuckle full mortise hinges at 4-1/2 by 4-1/2 inches, and the BEST FBB212 steel ball bearing pivot reinforced hinge for square edge doors. The Don-Jo BB74540 is standard duty as well, a commercial full mortise ball bearing hinge with 5 knuckles, square corners, steel body at 4-1/2 by 4 inches, built to the ANSI A8112 template. For a facility standard, hold the leaf size constant across the building or you will be cutting two different frame preps; the BB74540 at 4-1/2 by 4 and the McKinney pair at 4-1/2 by 4-1/2 are not interchangeable in the same prep.
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Does the Don-Jo BB74540-652 come with a warranty?
Absolutely. The Don-Jo BB74540-652 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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