internal door lock sizing

[Adsibob]

I am fitting a door handle to a door which comes with a 60mm "strong latch".  This means that once the latch will be fitted, the centre of the threaded mortice spindle bar on which the handle is mounted is 60mm from the edge of the door. I would like a mortice lock which once fitted will have a keyhole that is in line with the spindle bar. What size mortice lock do i need?

[Temp]

If I've understood correctly you want one with a 60mm backset (backset is measured from edge of door to centre of keyhole/spindle). Dimension "B"...

 

https://www.locksonline.co.uk/community/how-to-measure-door-locks-the-complete-guide.html

 

[Adsibob]

Very helpful this @Temp thank you. The trouble is I'm now trying to find a simple 2 lever mortice lock with a 60mm backset. Even upgrading to 3 lever doesn't open up many more choices.

[Temp]

So you're trying to use seperate latch and lock on same door? Can you switch the handle onto a combined unit?

Edited February 24, 2022 by Temp

[PeterW]

@Adsibob why are the numbers of levers relevant to you ..?? 

[Adsibob]

26 minutes ago, Temp said:

So you're trying to use seperate latch and lock on same door? Can you switch the handle onto a combined unit?

Yeah, that’s probably going to be easier, just annoying because I spent a bit of money on Corston to get everything matching everything, to the extent that my latch plates match my sockets and switches and handles. But I’m a bit OCD like that.

[Adsibob]

5 minutes ago, PeterW said:

@Adsibob why are the numbers of levers relevant to you ..?? 

Levers are irrelevant. It’s just to keep my kids out of my bedroom.

[PeterW]

So a standard 3 lever will be fine but your issue is 60mm is the euro standard that’s why you will struggle. If you go with 57mm then you have lots more options and you should be able to work with the 3mm difference 

[Adsibob]

2 minutes ago, PeterW said:

So a standard 3 lever will be fine but your issue is 60mm is the euro standard that’s why you will struggle. If you go with 57mm then you have lots more options and you should be able to work with the 3mm difference 

Thanks. What’s the standard size the other side of 60mm? Is there a 62mm or 63mm standard?

[Adsibob]

I also need a fireproof sash latch with a rather large backset of at least 90mm, but preferably closer to 100mm. Any ideas? The largest I can find is this one, but the biggest backset it comes in is 82mm:

 

https://www.locksonline.co.uk/Locks/Mortice-Locks-/Fire-Rated-Mortice-Locks-For-Fire-Doors/Imperial-G5000-5-Lever-Mortice-Sashlock.html