Asec Double Door Rebate Kit for Asec 50mm Deadlocks

French doors and rebated double doors are a popular choice — they look great and let plenty of light through — but they come with a specific fitting challenge that catches out even experienced installers. The two door leaves overlap at the meeting edge, creating a stepped rebate of typically 13mm. A standard mortice deadlock faceplate is designed for a flat single door edge, which means without the right adapter, the bolt and faceplate simply won't line up correctly with the doorframe strike. That's exactly the problem this kit solves.

The ASEC Double Door Rebate Kit is the purpose-made adapter that allows the ASEC 50mm Deadlock to be correctly fitted to rebated double doors. It bridges that 13mm step between the door leaves, repositioning the faceplate so the bolt travels in the right direction and engages the keep cleanly and securely. The end result is a lock that operates exactly as it should — smooth, solid, and properly aligned — rather than the binding, misaligned mechanism you'd get without it.

The kit features countersunk screw holes for a flush, professional finish once installed. There's no proud hardware, no visible gaps, and no indication that anything other than a standard installation has taken place. Everything needed to fit it is in the box — all fixings are included, so there's nothing extra to source on the day.

Available in Polished Brass and Stainless Steel, both options make it easy to match the existing finish of the lock and surrounding door furniture. Whether you're a locksmith working through a French door job on a period property, a joiner fitting out a new build, or a homeowner who's realised mid-installation that the standard kit isn't going to cut it, this is a small but genuinely essential piece of hardware.

Don't overlook it. Trying to fit a mortice deadlock to a rebated door without the correct rebate kit is one of those jobs that looks achievable right up until the point where it clearly isn't — and ordering the fix afterwards costs far more time than the kit itself.