Keedex K-BXMOR8155F Mortise Lock Box Offset Mortise Lock Box No Trim/no Cylinder Hole Mortise Prep Offset

It's a weld-on gate box that houses a mortise lock on a gate or a frame with no place to mortise a lock. The K-BXMOR8155F is prepped for a mortise lock body only, with no trim holes and no cylinder hole cut, so the installer drills the cylinder and trim locations to match the specific lock and the hardware going on it. Pick this one when the gate is offset hung.

The box measures 8 x 15-1/2 x 1-3/4 inches. That 1-3/4 inch depth is the number that decides it: the box has to clear the gate stile and whatever is behind it once welded on, and the 15-1/2 inch run needs a straight, unobstructed length of frame. Measure the stile face before ordering, because there is no way to trim a welded steel or aluminum box down.

Offset hung means the pivot sits inboard of the gate edge, so the lock box and the lock prep are positioned for that geometry. The K-BXMOR8155F is the offset hung version. If your gate or door is center hung, the prep location won't line up and you want the center hung box in the same family instead. Confirm how the leaf pivots before you pick between them.

Two materials: 14 gauge steel or .125 aluminum. Steel is the choice when the box is being welded to a steel gate frame and will be painted or powder coated. Aluminum matches an aluminum storefront or aluminum gate frame, both for welding compatibility and to avoid dissimilar metal corrosion outdoors. Match the box to the frame you're welding it onto, not to preference.

No lock, no cylinder, no trim. The box is the housing only, prepped for a mortise lock body. You order the mortise lock, the cylinder, and the lever or thumbturn trim separately, and you drill the cylinder and trim holes on site to suit whichever lock you're fitting. Budget for that drilling time on the job.

Because the cylinder and trim locations vary by lock manufacturer. A pre-cut box only works if your mortise lock matches the cut pattern it was made for. The K-BXMOR8155F ships with the mortise pocket prepped and everything else solid, so a locksmith can lay out the cylinder, thumbturn, and lever holes for whatever mortise body the job specifies. If you're standardizing a property on one lock and want less field work, a pre-cut box is the faster route.

Yes, provided every gate is offset hung and every stile can take the 8 x 15-1/2 x 1-3/4 inch box. Because the box is blank for cylinder and trim, you can fit the same mortise lock and keyway across all of them and key the whole run alike. Any center hung leaves in the run need the center hung box instead.