Keedex K-BXMOR-SGT4874 Weldable Sargent Mortise Deadbolt Gate Box

A gate box is the steel enclosure you weld into a hollow metal gate or frame to house a mortise lock body, because a gate stile has no pocket to mortise into. The Keedex K-BXMOR-SGT4874 is built for a Sargent mortise deadbolt, so it gives you a machined, correctly sized cavity plus the mounting surface the lock needs on an ornamental or tube-steel gate. It's a commercial-duty part in 14 gauge steel.

The box measures 4-1/2 inches W x 4-7/8 inches H x 1-3/4 inches D, so the stile has to give you at least that footprint on the face and 1-3/4 inches of clear depth behind it. On tube steel that means checking the tube is deep enough front to back before you cut, since the box protrudes into the gate cavity rather than sitting on the surface.

2-3/4 inch backset. That's the distance from the gate edge to the cylinder centerline once the box is welded in, and it's the standard commercial mortise backset, so a Sargent mortise deadbolt and its trim line up where they're supposed to. If your existing trim or escutcheon was cut for a 2-3/8 inch backset, the holes won't carry over.

No. This box is cut for a Sargent mortise deadbolt, and the cylinder, thumbturn, and armored front cutouts are specific to that lock's case. Keedex builds gate boxes per lock manufacturer, so if you're installing a different brand of mortise lock you need the gate box made for that brand rather than adapting this one.

No. The K-BXMOR-SGT4874 is the weldable steel housing only. You supply the Sargent mortise deadbolt body, the cylinder, the thumbturn or second cylinder, and the strike or keeper on the receiving post. Budget the lock and cylinder as separate line items when you're pricing the gate.

Not this one. The K-BXMOR-SGT4874 is a weld-in box, so installation means cutting the opening in the gate stile and welding the box in place. If nobody on the crew welds, that's a fabricator or gate shop call, not a job for a lock install kit. Plan on painting the welds afterward since the box ships as bare 14 gauge steel.

Yes, and that's the reason to use this box. Because it takes a Sargent mortise deadbolt at a 2-3/4 inch backset, the gate runs the same lock and the same cylinder keyway as the Sargent mortise hardware inside the building, so the gate falls on the existing masterkey system instead of needing a separate padlock key.

14 gauge steel is the substrate here, and it's the weight Keedex uses for weld-in commercial gate boxes. Once it's welded into the gate frame the assembly is as strong as the weld and the surrounding tube, so the box isn't the weak point. Bare steel takes paint or powder coat after welding, which is how you handle corrosion on an exterior gate.