Keedex K-BXMOR1 Weldable Gate Box for Mortise Locks, Schlage L Series, Sargent 7800/8200, Yale 4600, 8600, 8700

The box is the weldable housing only. It is a steel or aluminum weld-in pocket that lets a mortise lock body be installed in a gate or frame that has no stile to mortise. You order the mortise lockset, the trim, and the cylinder separately, and the box has to match the lock you picked, which for the K-BXMOR1 means a 2-3/4 inch backset mortise body such as the Schlage L Series, Sargent 7800 or 8200, or Yale 4600, 8600 or 8700.

The box measures 4-5/8 inches W x 8-1/8 inches H x 1-3/4 inches D, so the tube frame or gate member has to accept an 8-1/8 inch tall pocket and carry 1-3/4 inches of depth behind the face. On a narrow tube gate that depth is the number that kills the job more often than the height, so check the tube dimension before you cut.

Three substrates are offered: 14 gauge steel, 10 gauge steel, and .125 aluminum. Match the box to the gate you are welding it into. 10 gauge is the heavier steel and is the pick for a heavy exterior or vandal-exposed gate; 14 gauge steel is the standard weight. The .125 aluminum version exists so you can weld into an aluminum gate frame without dissimilar-metal welding, which is the deciding factor rather than strength.

No. This one is cut for mortise lock bodies only, and a cylindrical lockset needs a bored 2-1/8 inch cross bore through a face rather than a rectangular mortise pocket. If the hardware you are installing on the gate is a cylindrical leverset, you need a Keedex weldable box made for cylindrical locks instead, not the K-BXMOR1.

No. The K-BXMOR1 is machined for a 2-3/4 inch backset, so the cylinder and spindle holes line up with a 2-3/4 backset mortise body. A 2-3/8 backset lock will not register with the prep. 2-3/8 is the common residential bored-lock backset; commercial mortise bodies like the Schlage L Series are 2-3/4, which is what this box is set up for.

Commercial. The box is a commercial-grade weld-in housing, offered in 14 gauge steel, 10 gauge steel, or .125 aluminum, all of which are welded permanently into the gate frame rather than fastened. For a high-traffic apartment or campus pedestrian gate, the 10 gauge steel version gives you the most material at the face where a lock gets abused.

Yes, the Yale 8700 is one of the mortise bodies the K-BXMOR1 is made to take, along with Yale 4600 and 8600, Sargent 7800 and 8200, and the Schlage L Series. Pull the lock, weld the new box into the gate, and drop the same body back in. Just confirm the existing lock is a 2-3/4 backset, since that is the prep in this box.

Within limits, yes. The K-BXMOR1 accepts Schlage L Series, Sargent 7800 and 8200, and Yale 4600, 8600 and 8700 mortise bodies, so a facility running any mix of those three brands can stock one box for all its gates. Anything outside that group, or any lock that is not a 2-3/4 backset mortise body, needs a different box.

It welds in. There is no bolt-on option, which is why the substrate choice matters: pick 14 or 10 gauge steel to weld into a steel gate, and the .125 aluminum version to weld into an aluminum frame. Plan on a fabricator or a welder on site, plus finishing and paint after the box is set, since the box is not a finished trim piece.