McKinney TA2731 Full Mortise Hinge, 2-Knuckle, Standard Weight, 4-1/2" by 4", Square Corner

The TA2731 is a full mortise, standard weight steel hinge sized 4-1/2 x 4 inches, made for the flush door, frame and wall application. Both leaves mortise in, so the door edge and the frame rabbet both need to be prepped for a 4-1/2 inch leaf height and a 4 inch open width. It is a commercial hinge with ball bearings, intended for standard weight, medium frequency doors or doors carrying a closer. Heavier or high traffic openings should move to a heavy weight hinge instead.

Yes, handing is an order decision on the TA2731. It ships left hand or right hand, and unlike a five knuckle hinge you cannot flip a two knuckle hinge to suit the other swing. Determine the hand at the opening before ordering, and keep every hinge in the set the same hand.

Order the TA2731 with the NRP non-removable pin option. That is the normal call on any out-swinging exterior or corridor door where the barrel is on the unsecured side. McKinney also builds a safety stud version, where a stud on one leaf interlocks into the other so the door cannot be removed even if the pin comes out, and a non-removable door (NRD) option that set screws one hinge per set.

Standard weight is the right call here. The TA2731 is specifically recommended for standard weight, medium frequency doors and for doors with closing devices, and the ball bearings are what handle the added load a closer puts on the top hinge. Where you should step up is a high frequency opening or a genuinely heavy door: a main entrance, a stairwell in a busy building, or a lead lined or heavy timber leaf. For those, a heavy weight ball bearing hinge such as the Don-Jo HWBB74545 in 4-1/2 x 4-1/2 or the Ives 3CB1HW is the correct class of hinge.

Square corners only. The TA2731 leaf is square cut, so it needs a square corner mortise, which is what routed hollow metal frames and machine prepped commercial doors normally have. A door already cut for a radius corner hinge leaves a visible gap at the corners of the mortise. For a radius prep, a hinge cut to that radius is the correct part, such as the Orca Hardware 4014 Series in 4 x 4 with a 1/4 inch radius corner.

No. The TA2731 is a 4-1/2 x 4 inch commercial hinge and will not drop into a 3-1/2 inch residential mortise, which is a different leaf height and a different screw pattern. Replacing one means recutting both the door edge and the jamb. For a like for like residential swap, stay with a 3-1/2 inch hinge such as the Deltana DSB35 or the Schlage Residential S3P1010 in 3.5 x 3.5 square corner.

The TA2731 is offered with an Electrolynx quick connect concealed circuit in QC4, QC8, or QC12 wire counts, so it can carry power to the door. If the door needs a different base hinge, the Command Access ETH-CB70 is a 3 knuckle standard weight steel energy transfer hinge rated medium duty, and the BEST CECB179-12C is a steel full mortise concealed bearing electrified hinge with a 12 wire quick connect, also medium duty. For a heavier opening the Command Access ETH-BB68 is a 5 knuckle heavy duty steel energy transfer hinge. Match the wire count to the device you are powering.

The TA2731 is a standard duty two knuckle hinge recommended for standard weight, medium frequency doors or doors with closing devices. For a heavier or higher traffic opening, step up to a heavy duty full mortise ball bearing hinge: the Don-Jo HWBB74545 is a heavy weight full mortise ball bearing hinge at 4-1/2 inch by 4-1/2 inch, and the Ives 3CB1HW is a heavy weight steel concealed bearing full mortise hinge with 3 knuckles. Both carry a heavy duty rating where the TA2731 is standard duty.

The TA2731 can be ordered with the NRP non-removable pin option, and it also offers a non-removable door set screw option and a safety stud option that interlocks the two leaves so the door cannot be removed even if the pin is pulled. Among other brands, the Hager BB1168 is a non-removable pin full mortise ball bearing hinge rated heavy duty, and the Deltana CSB45N is a 4-1/2 inch by 4-1/2 inch square hinge pair supplied with a non-removable pin. The Deltana DE44R5TA is a 4 inch by 4 inch security hinge pair in steel with a 5/8 inch radius corner, so it needs a radius prep rather than the square corner prep the TA2731 uses.

No - they mount differently. The TA2731 is a full mortise hinge, mortised into both the door and the frame. The Hager 1129 is a half mortise plain bearing commercial hinge, 4-1/2 inch standard weight steel, rated heavy duty, which mortises into the door and surface mounts to the frame. Half mortise is used on channel iron or metal frames that cannot take a mortise. Same for full surface: the Hager 990 STEEL is a full surface prison hinge, 3 inch by 4 inch with a welded tip, heavy duty, and surface mounts on both sides. Neither drops into a TA2731 prep.

The TA2731 is a standard hinge and is recommended for doors with closing devices, meaning a separate closer does the work. If you want the closing action in the hinge itself, the Stanley Security 2060R is a full mortise spring hinge with square corners at 4-1/2 inch by 4-1/2 inch on a ferrous steel base, rated heavy duty. It shares the square corner and full mortise prep style of the TA2731 but is a half inch wider on the leaf, so confirm the frame mortise width before swapping.

The TA2731 has square corners and needs a square corner prep. For a radius prep, the Orca Hardware 4014 Series is a 4 inch by 4 inch plain bearing commercial hinge with a 1/4 inch radius corner, and the 3514 Series is the same 1/4 inch radius in 3-1/2 inch by 3-1/2 inch, both medium duty. On the residential side the Delaney 4 inch by 4 inch bulk exterior hinges use a 5/8 inch radius. Radius corners come in different radii, so match the 1/4 inch or 5/8 inch to what is cut in the door.

They are both square corner commercial ball bearing hinges, but not the same size. The Delaney CH401X is a 4 inch by 4 inch commercial ball bearing hinge with square corners, while the TA2731 is 4-1/2 inch by 4 inch - a half inch taller leaf. A 4 by 4 will not fill a mortise cut for a 4-1/2 inch hinge, so measure the existing cutout on the door edge before substituting.

A two knuckle hinge shows one clean joint line rather than a stack of five barrels, which is why it gets specified where the architect wants a plain finished look at the door edge. Function is the same full mortise ball bearing action. The trade off is handing: the TA2731 is ordered left or right hand, where a five knuckle hinge such as the Stanley Security FBB191 in 4-1/2 x 4-1/2 is non-handed and can go on either swing. If you are stocking hinges for a building and want one part number to cover every door, a five knuckle is the easier item to carry.

Yes. The TA2731 is recommended to hang a door for a 180 degree swing, which is what the 4 inch open width buys you on a 4-1/2 inch hinge: enough throw to clear the trim and let the door lay back. Check your own casing depth, since a deep trim or a wall mounted stop can stop the leaf short regardless of the hinge.

Both are covered. The TA2731 is furnished with 1/2 inch #12-24 machine screws for the metal frame or metal door leaf, and 1-1/4 inch #12 wood screws for a wood door. Standard practice on a hollow metal frame is machine screws into the tapped hinge reinforcement, and wood screws into the wood door stile.

McKinney offers magnetic monitoring on this two knuckle line, and the design permits field replacement of the magnet and the switch, which matters when a sensor fails years into service and you do not want to pull the door. If you would rather combine power transfer and position sensing in one part from a single source, the Command Access ETM-CB70 is a 3 knuckle medium duty energy transfer monitor hinge with door position sensing, and the ETM-BB68 is the heavy duty version.

Ball bearings sit between the knuckles and carry the door's weight on rolling elements, so the hinge keeps turning freely under a closer and on a door that cycles all day. A plain bearing hinge is metal riding on metal, fine on a light, low traffic interior door but it starts to bind and squeak once you add weight or frequency. The TA2731 is ball bearing. Plain bearing peers in the same commercial size range include the Orca Hardware 4040 Series in 4 x 4 square corner and the Hager 1129 half mortise hinge.

Only one hinge in the set carries the wiring. Order the QC4, QC8, or QC12 Electrolynx circuit on a single hinge, normally the center or top one, and hang the rest of the opening on plain TA2731 hinges of the same size, hand, and finish. Same logic applies to the NRD option, which is one set screwed hinge per set. Ordering every hinge electrified is money spent on transfers you cannot use.

The TA2731 is steel with a chrome plated finish, which is built for interior and protected commercial openings. In a wet, chlorinated, or salt air environment, plated steel is the wrong base material and the correct call is the stainless steel version of the same two knuckle design, the TA3331. Same standard weight two knuckle geometry, stainless base, minus the decorative tip options which are steel only.

The TA2731 is a commercial hinge. For interior residential work, the Delaney 3-1/2 inch by 3-1/2 inch bulk steel residential hinges ship as a pair with a 5/8 inch radius corner, and the Deltana DSB35 is a 3-1/2 inch by 3-1/2 inch square hinge sold as a residential pair. The Emtek 91013 is another residential option, a plain bearing pair at 3-1/2 inch by 3-1/2 inch with square corners in plated steel. All three are smaller leaf sizes than the 4-1/2 inch by 4 inch TA2731 and are prepped for residential jambs, not commercial hollow metal frames.

The TA2731 has a two knuckle design for a clean finished look and is commonly used in flush door, frame and wall applications. The Hager 920 is the closest peer on knuckle count: a full mortise concealed plain bearing hinge with 2 knuckle steel construction, rated medium duty with a concealed bearing. The difference to weigh is the bearing - the TA2731 is a ball bearing hinge, which is what makes it suitable for doors with closing devices.

They serve a different opening. The TA2731 is a standard duty commercial hinge for standard weight, medium frequency doors. Detention hinges are a separate class: the BEST BB855 is a heavy duty steel double weight concealed ball bearing prison hinge in the Detention Hardware series, and the Stanley Security BB855 is a double weight prison hinge at 5 inch by 6 inch furnished with no holes and not swaged. The Stanley in particular arrives undrilled and unswaged, so it is not a drop-in for a prepped commercial door the way the TA2731 is.

They are not interchangeable hardware. The TA2731 is a full mortise hinge that mounts on the edge of the door and the frame rebate, recommended to hang a door for a 180 degree swing. A pivot carries the door top and bottom instead: the BEST DAP-3 is a heavy duty double acting pivot for commercial interior doors, and the BEST CB1969R is a concealed bearing heavy weight pivot-reinforced hinge, both heavy duty. Double acting means the door swings both directions, which a mortise hinge like the TA2731 does not do.

The TA2731 is a two knuckle ball bearing standard duty hinge in steel, with a clean finished two knuckle look. A five knuckle standard weight peer is the Stanley Security FBB191, a 5 knuckle full mortise standard weight hinge at 4-1/2 inch by 4-1/2 inch, rated heavy duty. Five knuckle is the more common architectural profile and the FBB191 is a half inch wider on the leaf; two knuckle gives the flush appearance the TA2731 is built around. Pick one profile and hold it across the building so the doors read the same.

The TA2731 is ordered by hand, left hand or right hand, in 625 bright chrome or 626 satin chrome. Some peers are handed the same way - the Stanley Security CECB1900R54L is a three knuckle concealed bearing concealed conductor architectural hinge, steel full mortise, standard weight, 4-1/2 inch by 4-1/2 inch, square corner, left-handed, 4-wire, so the hand is fixed in the part number. Others, such as the Deltana CSB45N 4-1/2 inch by 4-1/2 inch square hinge pair, are sold as a non-handed pair. Confirm the hand of the opening before cross-referencing so you do not order a fixed-hand part for the wrong swing.

The TA2731 is 4-1/2 inch by 4 inch. Where the door is prepped for a 5 inch leaf, the Don-Jo HWBB75045 is a heavy weight full mortise ball bearing hinge at 5 inch by 4-1/2 inch in steel with a satin chrome finish, and the HWBB85045 is the same 5 inch by 4-1/2 inch size in brass with a satin chrome finish. Both are heavy duty. Satin chrome corresponds to the 626 finish the TA2731 is offered in, so the openings will match visually.

They are built for different service. The TA2731 is a commercial standard duty ball bearing hinge at 4-1/2 inch by 4 inch. The Emtek 94013 is a heavy duty ball bearing hinge pair at 3-1/2 inch by 3-1/2 inch with square corners in plated steel, and the Schlage Residential S3P1010 is a 3-1/2 inch by 3-1/2 inch square corner plain bearing mortise hinge sold in packs of three, rated medium duty. Both are 3-1/2 inch leaves, an inch shorter than the TA2731, and will not fill a commercial door and hollow metal frame prep.

Two chrome finishes: 625 bright chrome and 626 satin chrome. 626 is the one that matches the vast majority of commercial lever and closer hardware in a building, so it is the safer choice when you are matching existing openings. 625 is the polished version and reads much brighter next to satin trim.

Yes, and this is one of the reasons the TA2731 gets specified on visible openings. Flat, round, grooved, and lined decorative tips are offered on the TA2731 steel version. Those tip options do not carry over to the TA3331 stainless steel model.