McKinney T4A3786 Square Corner...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$33.89
$30.24
McKinney T4A3786 Square Corner 5 Knuckle Ball Bearing Full Mortise Hinge, Heavy Weight

McKinney T4A3786 Square Corner 5 Knuckle Ball Bearing Full Mortise Hinge, Heavy Weight

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Model: T4A3786-4.5X4.5-26D
$33.89
$30.24
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$33.89
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McKinney Hinge T4A3786 Overview
 

McKinney is ASSA ABLOY’s line of high quality architectural hinges for commercial use. McKinney joined the ASSA ABLOY family of products in 1996. Under the ASSA ABLOY banner, we have greatly expanded the research and development, and manufacturing capabilities of this product line to have the most impact on improving custom hinge manufacturing.

Full Mortise Hinges
Full mortise hinges come in a variety of metals, finishes, sizes, and weights to meet all your load bearing and security applications. They include two, three, and five knuckle styles, swing clear hinges, wide throw hinges, anchor hinges, electric hinges, institutional hinges, and pivots.


The most common application is a flush door/frame/wall condition using a hollow metal frame with a standard hollow metal or wood door which is flush or 1/16" inset from the face of the frame, with a wall which is either flush (or inset from the
face of the frame. Recommended to hang door for 180Ëš swing: Full Mortise Hinge. The same hinge could be used with a wood or aluminum frame provided the door/frame/wall conditions are flush.

Five Knuckle Heavy Weight Full Mortise Series

  • Heavy weight hinges should be used on all extra heavy doors or those exposed to high frequency use
  • T4A3386- Stainless steel base or available in brass base material polished
  • T4A3786- Steel base material
  • For Beveled Edge, where doors are beveled on hinge side, specify T4A4386 or T4A4786
 
RESOURCES & DOWNLOADS

McKinney Full Line Catalog

Manufacturer Resources

Product Specs

Subcategory:
Full Mortise Hinges
Knuckles:
5
Corner Style:
Square Corners
Product Group:
Door Hinges and Pivots
Product Subgroup:
Full Mortise Hinges
Product Type:
Hinges
Features:
Heavy Weight Hinges Should be Used on All Extra Heavy Doors or those Exposed to High Frequency Use
Duty Level:
Heavy Duty
Bearing Type:
Ball Bearing
Commercial/Residential:
Commercial
Tags:
mckinney t4a3786
Product Model:
T4A3786
Product Category:
Door Hinges and Pivots
Product Substrate:
Steel
Department:
Door Hardware

McKinney T4A3786-4.5X4.5-26D – Frequently Asked Questions

1) Will a McKinney T4A3786 hinge work on a hollow metal frame with a hollow metal or wood door?
That is exactly the condition McKinney builds the T4A3786 for. It is a full mortise hinge, so both leaves mortise in: one into the door edge, one into the frame rabbet. McKinney describes the common application as a flush door/frame/wall condition using a hollow metal frame with a standard hollow metal or wood door, with the door flush or 1/16 inch inset from the face of the frame. The same hinge works with a wood or aluminum frame as long as the door, frame and wall conditions are flush. Full mortise is also what McKinney recommends when you need to hang the door for a 180 degree swing.
2) My door mortise has rounded corners. Can I use the McKinney T4A3786?
No, not without recutting. The T4A3786 has square corners, which is the standard prep on hollow metal frames and factory-machined commercial doors. If your existing hinge pockets are radiused, you need a radius corner hinge or you will be chiseling out the corners of every pocket. Orca Hardware's 4 x 4 x 1/4 inch radius corner commercial hinge covers a 1/4 inch radius prep, and Delaney's 4 x 4 exterior residential hinge covers a 5/8 inch radius. Both of those are plain bearing rather than ball bearing, so they are not a like-for-like swap on a high traffic opening. Pull one existing hinge and look at the corner before you order.
3) Do I need the steel T4A3786 or the stainless T4A3386 for an exterior or wash-down opening?
The T4A3786 is the steel base version of McKinney's five knuckle heavy weight full mortise hinge. Where the opening sees weather, chlorides or frequent cleaning, McKinney offers the same hinge as the T4A3386 with a stainless steel base, or with a polished brass base material. The two carry the same square corner, ball bearing, heavy weight construction, so the choice is base material, not performance class. For interior commercial openings the steel base T4A3786 is the normal specification.
4) My doors are beveled on the hinge edge. Is the T4A3786 the right McKinney hinge?
No. For doors beveled on the hinge side, McKinney specifies the T4A4386 or T4A4786 instead. The T4A3786 is the square edge version. Same five knuckle heavy weight ball bearing family, different part number for the beveled application, so ordering the wrong one leaves you with a leaf that does not sit right against the door edge.
5) Do I actually need a heavy weight hinge, or is a standard commercial ball bearing hinge enough?
Heavy weight is for extra heavy doors and openings that see high frequency use. Think a solid core or lead-lined door, a large fire door, a school corridor or a hospital entrance that cycles all day. The T4A3786 is rated heavy duty for that service. On an ordinary interior office or storeroom door on a normal cycle count, a medium duty hinge does the job: Orca Hardware's 4-1/2 x 4-1/2 square corner ball bearing commercial hinge is the direct medium duty equivalent in the same size and corner style, and Ives' 3CB1 three knuckle concealed bearing full mortise hinge is another medium duty option. Where the door is heavy or the traffic is constant, do not downshift, that is where a lighter hinge sags and the door starts dragging.
6) I need to run power through the hinge to an electrified lock. Will the McKinney T4A3786 do that?
It will not. The T4A3786 is a mechanical five knuckle ball bearing hinge with no wire path through the barrel. For power transfer to an electrified lock, exit device or strike on the door leaf, you need an electric hinge in one of the hinge positions. Command Access ETH-BB68 is a five knuckle heavy duty steel base energy transfer hinge, which is the closest match to the T4A3786's weight class. If you also need door position monitoring back to the panel, the Command Access ETM-BB68 adds an integrated door position switch. BEST's CECB179-12C is a steel full mortise concealed bearing electrified hinge with a 12-wire quick connect, rated medium duty. Typical practice is one electric hinge plus mechanical hinges like the T4A3786 in the remaining positions.
7) This is an outswinging exterior door. Can I get the McKinney T4A3786 with a non-removable pin?
Yes, NRP is an option on the T4A3786. On an outswing door the hinge barrel sits on the unsecured side, so a standard pin can be driven out and the door lifted off regardless of what lock is on it. The non-removable pin adds a set screw in the barrel that seats against the pin once the door is closed, so it can only be backed out with the door open. Order it that way for any exterior outswing opening, and for interior doors protecting cash, records or drug storage. Hager's BB1168 is another heavy duty full mortise ball bearing hinge supplied with a non-removable pin if you need a second source.
8) What is the closest cross-brand equivalent to the McKinney T4A3786 heavy weight ball bearing hinge?
The T4A3786 is a heavy duty, five knuckle, ball bearing full mortise hinge with square corners on a steel base, offered in 4.5 x 4.5, 5 x 4.5, and 5 x 5 inch sizes. Don-Jo HWBB74545 is a heavy weight full mortise ball bearing hinge in 4-1/2 by 4-1/2 inch satin chrome, and Don-Jo HWBB75045 is the same heavy weight full mortise ball bearing pattern in 5 by 4-1/2 inch steel with a satin chrome finish, so a two-size opening schedule can be covered by the pair. Hager BB1168 is another heavy duty full mortise ball bearing hinge, distinguished by being furnished with a non-removable pin.
9) The frames are prepped with radius corner hinge pockets - which hinges fit instead of a square corner hinge?
The McKinney T4A3786 has square corners, so it needs a square corner prep. Orca Hardware COM4014 is a 4 by 4 inch hinge with a 1/4 inch radius corner in plain bearing at medium duty, and Orca Hardware COM3514 is the 3-1/2 by 3-1/2 inch version of that 1/4 inch radius plain bearing pattern. For a 5/8 inch radius prep, Deltana DE44R5TA is a 4 by 4 inch, 5/8 inch radius steel security hinge sold as a pair. Confirm the radius on the existing prep before ordering, since a 1/4 inch corner and a 5/8 inch corner are not interchangeable.
10) Should I use a five knuckle ball bearing hinge or a concealed bearing hinge on a commercial door?
Five knuckle ball bearing, like the T4A3786, puts the bearings in visible races between the knuckles. The bearings carry the load, the barrel shows five knuckles, and it is the long standing architectural look on hollow metal openings. Concealed bearing hides the bearing inside the barrel for a smoother, cleaner barrel line, usually with three knuckles. Ives makes both: the 3CB1HW is a steel heavy weight concealed bearing full mortise hinge with three knuckles, and the 3CB1 is the medium duty version. Function on the door is the same. Pick on the barrel appearance you want and, more importantly, on matching whatever is already hanging on the other openings in the building.
11) Do all three sizes of the McKinney T4A3786 come in the same finishes?
Every finish is offered in all three sizes, so you can standardize a building on one finish and still order 4-1/2 x 4-1/2, 5 x 4-1/2 and 5 x 5 to suit each opening. Nine finishes: 600 primed for painting, 605 bright brass, 606 satin brass, 612 satin bronze, 613 satin bronze oil-rubbed, 625 bright chrome, 626 satin chrome, US10A antique bronze, and BSP black suede powder. 626 satin chrome and 630 grade stainless looks are the usual commercial defaults, and 600 is the one to order when the hinges get painted out with the frame.
12) I have 3-1/2 inch square corner hinges on residential doors. Will the McKinney T4A3786 replace them?
No. The T4A3786 starts at 4-1/2 x 4-1/2, so it will not drop into a 3-1/2 inch mortise without cutting the pockets longer in both the door and the jamb. For a 3-1/2 inch square corner prep where you still want ball bearings, Emtek's 94013 is a heavy duty ball bearing hinge in 3-1/2 x 3-1/2 with square corners, plated steel, sold as a pair. Schlage Residential's S3P1010 is a 3-1/2 x 3-1/2 square corner plain bearing mortise hinge in a pack of three, and Delaney's 3-1/2 x 3-1/2 steel residential hinges cover the same prep with a 5/8 inch radius rather than square. Save the McKinney for the commercial openings that are already prepped 4-1/2 or 5 inch.
13) Is the McKinney T4A3786 handed, or does the same hinge work on left and right hand doors?
The T4A3786 is a standard five knuckle full mortise butt hinge, so it is non-handed. The same hinge hangs a left hand or right hand door, you just flip it. Handing only becomes an ordering decision on hinges with directional features, such as Stanley's three knuckle concealed conductor architectural hinge, which is catalogued left-handed as a specific part. For the T4A3786 all you need to specify is size, finish, and whether you want the non-removable pin.
14) Which square corner hinges are plain bearing rather than ball bearing, and where does that difference matter?
Plain bearing hinges run knuckle on knuckle with no bearing race. Ives 1010RP is a steel plain bearing residential hinge with square corners sold as a set of 3 at medium duty, Schlage Residential S3P1010 is a 3.5 by 3.5 inch square corner plain bearing mortise hinge in a pack of 3 at medium duty, and Orca Hardware COM4040 is a 4 by 4 inch square corner plain bearing commercial hinge at medium duty. The McKinney T4A3786 is a ball bearing hinge in the heavy duty class, which is the distinction to check when a spec sheet calls out bearing type on a high frequency door.
15) The specification calls for a concealed bearing hinge rather than a visible ball bearing knuckle - what heavy duty options cover that?
Ives 3CB1HW is a steel heavy weight concealed bearing full mortise hinge with 3 knuckles, rated heavy duty with a concealed bearing, so the bearing does not show between the knuckles. BEST CB1969R is a concealed bearing heavy weight pivot-reinforced hinge, also heavy duty. Both differ from the McKinney T4A3786, which is a five knuckle hinge with ball bearings between the knuckles.
16) The door has to self close - can a spring hinge be used in place of the McKinney T4A3786?
Yes, if closing force is the requirement. Stanley Security 2060R is a full mortise spring hinge with square corners in 4.5 by 4.5 inch on a ferrous steel base, rated heavy duty, so it shares the full mortise square corner 4-1/2 inch footprint the T4A3786 uses in its 4.5 x 4.5 size. The T4A3786 is a ball bearing hinge and provides no closing force, so the door would rely on a separate closer.
17) Is a heavy weight commercial hinge the right hinge for a detention or holding cell door?
Detention openings use a different family of hinge. BEST BB855 is a heavy-duty steel double weight concealed ball bearing prison hinge in the Detention Hardware line, and Stanley Security BB855 is a double weight prison hinge furnished with no holes and not swaged in 5 by 6 inch, which lets the frame shop drill and weld to the detention frame. Hager 990 STEEL is a full surface prison hinge, 3 by 4 inch with a welded tip at heavy duty. The McKinney T4A3786 is a commercial heavy duty full mortise hinge intended for the flush door, frame, and wall condition described for standard hollow metal and wood doors.
18) How does the Stanley FBB191 compare with the McKinney T4A3786 as a five knuckle full mortise hinge?
Stanley Security FBB191 is a 5-knuckle full mortise standard weight hinge in 4.5 by 4.5 inch. The McKinney T4A3786 is also a five knuckle full mortise hinge and shares the 4.5 x 4.5 size, with square corners on a steel base, and it sits in the heavy duty class that McKinney calls for on extra heavy doors or those exposed to high frequency use. The choice comes down to standard weight versus heavy weight for the door leaf and cycle rate at that opening.
19) We also need door position monitoring at the hinge - which hinge does that?
Command Access ETM-BB68 is an energy transfer monitor hinge with an integrated door position switch, heavy duty, in the ETM 5 Series, so it carries power to the door and reports door position on one hinge. Command Access ETM-CB70 is the 3 knuckle steel base version with door position sensing at medium duty in the ETM 3 Series. The McKinney T4A3786 is a mechanical five knuckle ball bearing hinge with no switch or conductors, so monitoring would come from a separate device.
20) The frame will not take a full mortise leaf, or the door swings both directions - what hinge or pivot is used instead?
Hager 1129 is a half mortise plain bearing commercial hinge, 4-1/2 inch standard weight steel at heavy duty, which mortises into the door and applies to the face of the frame. For a door that swings both ways, BEST DAP-3 is a heavy duty double acting pivot for commercial interior doors. Both address conditions the McKinney T4A3786 does not, since it is a full mortise hinge recommended for hanging a door on a 180 degree swing in a flush door, frame, and wall condition.
21) Are the Delaney and Deltana square hinges sold in pairs a substitute for a commercial heavy weight hinge?
They are built for different service. Delaney RH45xx is a 4 by 4 inch bulk exterior residential hinge with a 5/8 inch radius sold as a pair, Delaney RH35xx is the 3-1/2 by 3-1/2 inch bulk steel interior residential hinge, and Deltana DSB35 is a 3-1/2 by 3-1/2 inch square residential hinge sold as a pair. The McKinney T4A3786 is a commercial heavy duty ball bearing hinge in 4.5 x 4.5, 5 x 4.5, and 5 x 5 inch with square corners, so both the corner treatment and the leaf sizes differ from the residential pairs above.
22) Can I hang a door that swings both directions on McKinney T4A3786 hinges?
No. Full mortise butt hinges like the T4A3786 swing one way only, up to a 180 degree swing on a flush condition, which is what McKinney recommends the full mortise hinge for. A door that has to push open in both directions needs a double acting pivot instead: BEST's DAP-3 is a heavy duty double acting pivot for commercial interior doors. Kitchen pass-throughs, stockroom doors and traffic doors all fall in that category, and no butt hinge will do it.
23) We standardize on satin chrome across a building - which heavy weight ball bearing hinges match that finish?
The McKinney T4A3786 is offered in 626 satin chrome in 4.5 x 4.5, 5 x 4.5, and 5 x 5 inch, so one finish covers all three leaf sizes on a mixed opening schedule. On the Don-Jo side, HWBB84545 is a heavy weight full mortise ball bearing hinge, 4-1/2 by 4-1/2 inch in satin chrome, and HWBB85045 is the 5 by 4-1/2 inch brass hinge in satin chrome, both rated heavy duty. Confirm the finish code on the existing hinges before mixing brands, since satin chrome over steel and over brass are different base materials under the same plating.
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Does the McKinney T4A3786-4.5X4.5-26D come with a warranty?
Absolutely. The McKinney T4A3786-4.5X4.5-26D is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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