Keedex K-BXDBL234-2D Double Lock Box Hole 234BS/218 2 Inch Wide 14 Gauge Steel

The K-BXDBL234-2D is a weld-on steel lock box that houses a cylindrical lockset on a gate or a tubular metal frame that has no room to mount a lock directly. It's punched for a 2-1/8 inch cylindrical bore with a 2-3/8 inch backset, so a standard commercial knob or lever set drops straight into it. The box gives you a flat mounting surface and covers the lock body, which is what you need on ornamental iron and chain link frame gates where the stile is a tube.

Yes, provided it's a 2-1/8 inch bore, 2-3/8 inch backset cylindrical lock. That is the standard bore and the shorter of the two common commercial backsets, so most knob and lever sets prepped for it will mount. A lock ordered at the 2-3/4 inch backset will not line up, and neither will a mortise lock, which needs a pocket rather than a bored hole.

The box is the housing only. You order the cylindrical lockset separately, in a 2-1/8 inch bore with a 2-3/8 inch backset, plus whatever strike or keeper you're using on the receiving post. Nothing about the box restricts which brand of cylindrical lock you put in it as long as the bore and backset match.

Double refers to the box being bored on both faces, so a cylindrical lockset can be operated from either side of the gate rather than from one face only. It's the version to order when you need key or lever access from both the street side and the yard side of the same gate.

14 gauge steel throughout, and it's specified as commercial rather than residential duty. That's a heavy enough wall for a perimeter gate that gets pulled, kicked, and slammed daily. The box ships as bare steel, so it wants paint or powder coat after welding for outdoor service.

A hollow tube gate frame has nothing to clamp a cylindrical lock to, and drilling it leaves the lock body hanging in the tube with no backing. That's what the box solves: it welds to the frame and gives the 2-1/8 inch bore a 14 gauge steel wall on each side for the lock to bear against. If you're mounting into a solid wood or a prepped hollow metal door, you don't need a box at all. If it's an iron or chain link frame gate, you do.

Since the box takes an ordinary 2-1/8 inch bore, 2-3/8 inch backset cylindrical lockset, you can put the same brand and keyway you already run inside the building on the gate, and key it into the existing system. That's the practical reason to use a box rather than a padlock and hasp on a property where one key needs to open everything.