Measuring the existing night latch

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kashifmehmood

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Hello,

I have seen instructions on the web that one has to measure the night latch from the center of the hole to the door edge. That will be either 40mm or 60mm.

Mine is set-up slightly different (pictures attached). Can anyone please advise how to go about measuring this the right way?

Thank you. View media item 73445 View media item 73444
 
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From the outside the measurement you need is the centre of the cylinder to the doors edge. 40mm and 60mm are the most common but other sizes can be found.
DC
 
What you are showing is a Union drawback rim lock.
Imagine you have just come home and are outside, you put the key in the cylinder and turn. You step inside and close the door, you are now looking at the backset. The cylinder has a piece on it that comes through the door to pull back the lock and the latch.
Now with the door open the measurement you want is from the door edge to the centre of the cylinder (where you put the key in).
I said it would be 40mm or 60mm having looked at the specifications it will be 50mm or 60mm.
DC
 
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You are measuring the wrong side.
You need to be looking at the other side of the door. The measurement you need is from the edge of the door to the centre of the external cylinder.
The picture is now allowing me to identify the lock as a 50mm.
Check that on the outside: edge of door to the centre (where the key goes in) of the lock cylinder.
DC
 
I am struggling to find a 50mm night latch which complies with BS3621. Can you recommend any website / trader?

Thanks.
 
Ok. I see where you are going, you wish to bring the door up to meet your insurance specification without doing too much (or any) carpentry.
unfortunately there is not a rim lock with a 50mm backset that meets BS 3621.
My best advice is to add in a mortice lock lower down the door ie Union (ex Chubb) 3G114e and keep your cylinder where it is.
DC
 
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