Fitting Front Door Lock
Usually the backset measures 2 3 8 inches or 2 3 4 inches.
Fitting front door lock. The key to success is getting the hole for the cylinder in the right position. The distance between the edge of the door and the center of the lock hole. For front doors it is best to fit two locks a mortice deadlock about halfway up and a night latch one third of the way down the door. A 5 lever mortice deadlock conforming to bs3621 will have the british standard kitemark engraved on the faceplate of the lock and operates the same way as a standard 5 lever mortice deadlock.
Take care with the marking out and drilling to ensure excellent results. If you don t get this precise the lock may not fit properly. 5 lever mortice deadlock conforming to bs3621 more secure type of front door lock back door lock. However if you only fit one lock make it an automatically dead locking night latch.
Before purchasing a lock measure your door s backset cross bore and thickness to ensure you find the right fit. Where the door is self closing the latch has an angled or rounded edge and is sprung so that it automatically locks when the door is closed.