As a guide the height of your lock should be about 1 metre high step 2 using your measurement mark out both the top and bottom of the latch step 3 measure and mark out a vertical central line.
How to fit a mortice lock to an external door.
Chisel away a small amount of wood at a time to open the drill holes into a clean rectangular hole to fit your lock.
To prepare the mortice slot for the lock start by marking the centre of the thickness of the door.
Unless you fit a bs 3621 night latch will require an additional lock fitted to your door to improve security such as a mortice lock.
Chisel a recess for the faceplate.
A mortise lock in a very strong special locking system fitted to the inside of a door.
This will be your guide when drilling.
The body of the lock can be used as a template which you should hold against the correct position on the door and mark with a pencil draw around it carefully always keeping it central to the mark that you made.
Step 1 measure where the lock will fit on the door.
Fit the lock and check the positions of the door handle spindle and key hole adjust these if necessary.
Using a sharp chisel cut out the rectangular recess on the edge of the door to take the front plate of the lock.
To use a mortise lock your door must be thick enough to accommodate it.
Here are six things you need to know about mortise locks for residential door security.
Fit the lock back in the door so that the front plate is flush with the edge check the positions of the holes for the key hole and door handle spindle from both sides of the door if necessary remove the lock and adjust the size and or position of the holes so that they line up with the appropriate parts of the mortice lock body.
When the mortice lock space is chiselled out insert the lock and outline the faceplate with a marking knife.
The minimum door width is 45mm or 1 75 inches.
Difference between rim locks and mortice locks the difference between a rim lock and a mortice lock is that a rim lock is fitted on the surface of the door whilst a mortice lock is fitted in the door edge.