How to Install a Security Door Lock

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Woodie's DIY will show you how to install a security door lock.

How to do it

Step 1

Before starting, be sure to read your lock’s specific installation instructions as measurements can vary.

Step 2

Select a position for the door lock and use a pencil to mark the exact measurements, as per manufacturers instructions, from the edge of the door.

Step 3

Before drilling remember to put on your safety glasses. Using a 32mm Flat Wood drill bit, drill a hole through the door.

Step 4

Drilling on both sides will stop the wood splitting on the door. When you see the bit emerging from the other side of the door, stop and drill in from that side also.

Step 5

With the key removed, insert the cylinder through the brass ring and place it in the hole.

Step 6

Hold the fixing plate against the inside of the door with the flat connecting bar protruding through the central hole of the fixing plate.

Step 7

Mount the fixing plate to the door 3mm from the edge with wood screws.

Step 8

Remove the cylinder and position the lock on the fixing plate. Mark around the forend lip.

Step 9

Prepare the edge of the door, using a hammer and chisel, to accept the forend lip.

Step 10

The forend lip in the lock should finish flush with the door.

Step 11

Reposition the cylinder and mark the connecting bar where it should be cut. The connecting bar should protrude through the door by the amount indicated in the manufacturer’s instructions.

Step 12

You can use two sets of pliers instead of a hacksaw to cut the connecting bar, simply grip the bar just above the required mark with one pliers and bend the remaining bar clean off with the other.

Step 13

Secure the cylinder to the fixing plate using flat ended connecting screws. They should be inserted through the holes in the centre of the fixing plate. For doors less than 54mm thick, you may need to shorten the connecting screws to make sure that they fit through on to the fixing plate.

Step 14

Before fitting the lock case, ensure that the notch on the rotatable cap follower is aligned with the arrow on the cap.

Step 15

Place the lock case over the fixing plate, making sure that the flat connecting bar is inside the slot on the lock case (a small piece of card may be required to manipulate the connecting bar to assist this action).

Step 16

Push the lock case down firmly onto the fixing plate making sure its flush with the edge of the door. Secure the lock case to the fixing plate using two small screws.