McKinney T4A3786 Square Corner Heavy Weight Full Mortise Hinge with ElectroLynx Quick Connect Concealed Circuit

The T4A3786 comes in 4-wire, 8-wire and 12-wire ElectroLynx versions, and the wire count has to cover every circuit crossing the door. Each circuit is rated 4 amps continuous at 24 volts AC or DC on 28 gauge multi-strand wire. QC4 and QC8 both use a single 8 position connector; QC12 uses an 8 position plus a 4 position connector, so plan for two plug points at the frame end. Count what you're feeding: an electric strike or solenoid latch retraction alone usually lives inside 4 wires, while request-to-exit, latch monitoring and lock status together push you to 8 or 12.

For the 4-wire and 8-wire versions, yes. The restriction is on QC12 combined with the Magnetic Monitoring (MM) option, which is not recommended for wood or solid core doors. The ElectroLynx circuit can be paired with MM on most full mortise hinges, but if you need door position monitoring on a wood or solid core leaf, take the 12-wire and MM combination off the order and use a lower wire count instead.

The ElectroLynx wires are coordinated to work with other ASSA ABLOY Group brands electro-mechanical hardware, so the quick connect plugs mate rather than requiring you to splice at the hinge. The concealed plug connectors carry power from the incoming source through to the electrified hardware, which is what removes the separate or exposed wiring and the junction box in the door edge. Brass eyelets protect the wire where it passes through the leaf. For hardware outside that group, you're matching the 8 position (and on QC12, additional 4 position) connector at both ends.

The BEST CECB179-12C is the lighter-duty answer: a steel full mortise concealed bearing electrified hinge with 12-wire quick connect, rated medium duty. The McKinney T4A3786 is a heavy weight hinge, and heavy weight hinges should be used on all extra heavy doors or those exposed to high frequency use - on a standard interior door at ordinary traffic that capacity is not being used. Both carry a 12-wire circuit, so the wire count the access control panel needs is covered either way.

Only on the non-electrified positions. The Don-Jo HWBB84545 is a heavy weight full mortise ball bearing hinge, 4-1/2 by 4-1/2, in satin chrome - the same heavy duty class and the same leaf size as the T4A3786's 4.5 x 4.5 satin chrome 626 build, but it carries no concealed circuit. The McKinney's whole purpose is the ElectroLynx concealed plug connectors that transfer power from the incoming source through to the electrified hardware. Electric hinges go in the center position on the door, so a common approach is the electrified hinge at center with plain heavy weight hinges such as the HWBB84545 top and bottom.

The Command Access ETH-BB68 Energy Transfer Hinge is the nearest peer: it is a 5 knuckle heavy duty steel base energy transfer hinge, matching the T4A3786's 5 knuckle count and heavy duty build while carrying power through the hinge to electrified door hardware. The difference is the connector ecosystem - the McKinney uses ElectroLynx quick connect plugs whose wires are coordinated to work with other ASSA ABLOY Group brands electro-mechanical hardware, so if the lock or exit device on the opening is an ASSA ABLOY product already prepped for ElectroLynx, the T4A3786 plugs straight in. On a mixed-brand opening the ETH-BB68 is the equivalent swap.

The Command Access ETM-BB68 Energy Transfer Monitor Hinge builds an integrated door position switch into a heavy duty energy transfer hinge, so one hinge handles both power transfer and position sensing. The McKinney T4A3786 route to the same result is the Magnetic Monitoring option, which can be used in conjunction with most full mortise hinges - with the caveat that a QC12 hinge combined with MM is not recommended for wood or solid core doors. If the leaf is wood or solid core and 12 wires are required, the ETM-BB68 is the alternative that keeps monitoring on the hinge.

They overlap but they are not interchangeable. The Stanley Security CECB1900R54L is a three knuckle concealed bearing concealed conductor architectural hinge, steel full mortise, standard weight, 4-1/2 by 4-1/2, square corner, left-handed, 4-wire. The McKinney T4A3786 is a 5 knuckle heavy weight steel full mortise hinge with square corners, offered in 4-wire, 8-wire and 12-wire ElectroLynx configurations in 4.5 x 4.5 and 5 x 4.5. So the Stanley is a standard weight three knuckle hinge specified left-handed at 4 wires, while the McKinney is a heavy weight five knuckle hinge that also covers 8 and 12 wire circuits and a 5 inch leaf height. Match knuckle count, weight class and wire count before treating one as a drop-in for the other.

That's exactly what it's for. The T4A3786 is a heavy weight, heavy duty full mortise hinge, and McKinney's guidance is that heavy weight hinges should be used on all extra heavy doors or those exposed to high frequency use. It's steel, commercial rated, with a 5 knuckle ball bearing barrel and square corners. On a stairwell, entry vestibule or corridor door running an electrified lock all day, the heavy weight version is the one to spec over a standard weight electric hinge.

Two sizes, 4-1/2 x 4-1/2 inches and 5 x 4-1/2 inches, both in 626 satin chrome, and every wire count (4, 8 and 12) is offered in each size. The 5 x 4-1/2 is the one to take when the door has heavy trim or a wide stop and you need the extra leaf width for clearance; 4-1/2 x 4-1/2 is the common commercial size. Because the electric hinge sits in the center position, order the size that matches the existing hinges on that leaf so the mortises line up.

Both fastener types are covered: 1/2 inch x #12-24 machine screws for the hollow metal frame side, and 1-1/4 inch x #12 wood screws for a wood door or wood frame. So a hollow metal frame with a wood door is handled out of the box. What is not in the hinge box is the low voltage wiring run in the frame, the power supply, and the electrified lock or strike it feeds.

Not for this one. The T4A3786 is a 5 knuckle full mortise hinge, and McKinney handing applies to two knuckle hinges. Some electrified hinges do come handed, for instance the Stanley Security CECB1900R54L three knuckle concealed bearing conductor hinge is catalogued left-handed, so if you're cross-shopping, check the hand on that one. The T4A3786 you order by size, wire count and finish.

Yes, and that's the standard call on any outswing opening where the hinge barrel is on the secure side. NRP is offered as an option on the T4A3786, and it keeps the pin from being driven out to lift the door off. On an access controlled exterior or stairwell door, where the whole point of the electric hinge is that the lock stays powered, leaving the pin removable defeats the opening.

They do the same job, get low voltage across the gap without an exposed loop, and differ in build and monitoring. The T4A3786 is a heavy duty 5 knuckle steel hinge with the ElectroLynx quick connect plug. The Command Access ETH-BB68 is also a heavy duty 5 knuckle steel base energy transfer hinge; the ETH-CB70 is the 3 knuckle standard weight version if the door is lighter. If you also need door position sensing built into the same hinge, the Command Access ETM-BB68 has an integrated door position switch, whereas on the McKinney side monitoring is a separate MM option on the hinge.

The Don-Jo HWBB85045 is a heavy weight full mortise ball bearing hinge in 5 by 4-1/2, brass, satin chrome finish, which lines up with the T4A3786's 5 x 4.5 satin chrome 626 size. Don-Jo also lists the HWBB75045 in the same 5 by 4-1/2 heavy weight steel with satin chrome finish. Both are heavy duty like the McKinney, and neither carries a circuit - they fill the non-electrified positions on the same opening.

Not for the electrified position. The Ives 3CB1HW is a steel heavy weight concealed bearing full mortise hinge with 3 knuckles, heavy duty, so it matches the T4A3786 on substrate, weight class and full mortise prep - but it is a 3 knuckle concealed bearing hinge with no conductor, where the McKinney is a 5 knuckle hinge carrying an ElectroLynx concealed circuit for 4 amp continuous at 24 volts AC or DC per circuit. If the opening needs power to an electrified lock or strike, the 3CB1HW cannot deliver it.

Both can get you there. The McKinney T4A3786 offers NRP non-removable pin as an option, and the Hager BB1168 is a non-removable pin full mortise ball bearing heavy duty hinge as its standard configuration. The deciding factor is the circuit: if the opening also needs power carried to electrified hardware, the T4A3786 with the NRP option covers security and power in one hinge; if it is a plain out-swing door with no electrified lock, the BB1168 does the security-pin job without the wiring.

No - they solve a different opening. The Deltana CSB45N is a 4-1/2 by 4-1/2 square hinge sold in pairs with non-removable pin, and the Emtek 94013 is a heavy duty ball bearing hinge pair at 3-1/2 by 3-1/2 with square corners in plated steel. Both share the square corner profile with the T4A3786, but the McKinney is a commercial heavy duty steel hinge carrying an ElectroLynx concealed circuit for electrified door hardware. Square corners alone do not make a substitute; on an access-controlled commercial opening the conductor is the requirement.

For a detention opening the purpose-built options are the BEST BB855 heavy-duty steel double weight concealed ball bearing prison hinge, the Stanley Security double weight prison hinge furnished no holes and not swaged at 5 by 6, and the Hager 990 STEEL full surface prison hinge 3 by 4 with welded tip, heavy duty. The McKinney T4A3786 is a heavy duty commercial full mortise hinge whose distinguishing feature is the ElectroLynx concealed circuit - it belongs on an access-controlled commercial opening rather than a double weight detention frame. Where a secured opening needs power to the lock, plan the transfer separately from the detention hinge.