Installing a Mortise Set in a Door

A man opens a door.
  • 1-2 hours
  • Intermediate
  • 0-1,000
What You'll Need
Tape measure
Mortise lockset
Mortise lock template
Hole saw

The cylindrical lock set is the most common type of lock set that is used in doors, but a mortise set is much stronger and secures the door with a higher level of security. The mortise set fits in a pocket in the door. Making this pocket for the lockset in the door can be a difficult process. However, using the mortise template, it can be done easily. With a template, the installation process is fairly simple and can be completed in one day.

Step 1 - Measure and Prepare

After unpacking the lock set, check which template is provided with it. This will give you the measurement of the pocket that you have to make in the door. Next, plan where you want to place the lock. It is better if you place the lock approximately 40 inches above the ground. Use a pencil to mark the spot and then set the template tool on the edge of the door. If there is an existing lock present on the door then make sure you place the template on the spot to cover the existing mark on the door.

Step 2 - Make the Pocket

Tighten the clamps and make sure all the clips are properly attached once you have set up the template tool on the edge of the door. This template will act as a guide for making the pocket properly. The pocket should be about 1/8 inch deeper than the lockset. If you have set the template tool properly then you would not have any problem with this. Use the router for making the pocket and be careful that the template is not getting displaced while making the pocket.

Step 3 - Lock Trim and Relief Pocket

Use the router to make a pocket for the lock trim on the edge of the door. The dimension of this pocket will be the same as the latch plate. This pocket will allow the latch plate to fit so the pocket must be made with the correct thickness and dimension. The relief pockets are built on either side of the mortise lock pocket. The pocket is about 3/8 inches deep and it is best to use hammer and chisel for making this pocket.

Step 4 - Install the Lock

Now use the paper lock temple and use the hole-saw for making holes following the paper template. Install the lock set inside the pocket and screw it to the edge of the door. You can connect the trim on either side of the lock as needed. After connecting the trim, properly align the connecting rods and then fix the trim using screws.

Step 5 - Finish Installation

On the exterior side, screw the cylinder on the lock body. Chisel out a space in the frame for the strike plate and then check to system to make sure it works.