Tubular latches are used on internal doors and are opened by either turning a knob or by using a lever handle.

Tubular latches come in several different sizes, mainly- 63mm (2 1/2 inch), 76mm (3 inch) and 95mm (3 3/4 inch) The longer Tubular latches are used when there is a small distance between the door furniture and the door casing, for example when fitting door knobs you need a longer tubular latch than you do with a Lever as you have to grab the knob to open it to open the door.

Here we are fitting a new door and so the striker plate for the tubular latch is already fitted to the door casing.

Here we have marked where the Latch needs to be in order for the door to close correctly.

The two lines are where the top and bottom of the tubular latch need to be. Then a line is drawn down the centre of the door and the centre of the two lines is marked, this is the drilling mark.

Here you can see that the latch is aligned with the marks on the edge of the door.

Obtain a wood drill which is the correct size for your tubular latch and wrap some red tape on the drill so that it marks the correct depth to drill for the tubular latch.

The drill must be kept square to the door, if the drill is not square to the door then the drill bit can exit at the side of the door and can ruin it.

Drill the hole to the correct depth on a medium speed.

Ensure that all wood chips and dust are removed from the hole and then position the tubular latch and draw around it.

Remove the latch and you are left with a pattern to follow. You will notice that I have also marked the screw holes as these are often proud of the latch and require countersinking. Carefully cut around the marked are using a sharp knife, such as a stanley knife.

Now remove the wood to the correct depth using a sharp wood chisel.