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As a novice, I was wondering how I should find the correct replacement for a mortise lock. I wish to change it to one with a thumbturn deadbolt. This is what it currently looks like and measures:

current door lock

Will I be able to replace it with a lock similar to this:

ideal door lock
source: GJohns.co.uk - Euro Cylinder Sash Lock - Key / Thumbturn

Key (no pun intended) point being the thumbturn deadbolt.

From what I could research on merchant websites, all the euro cylinders seem too long for my door thickness. Case in point the cylinder in the second image measures as such:

ideal door lock cylinder measures
source: GJohns.co.uk - Euro Cylinder Sash Lock - Key / Thumbturn

So, in conclusion,

  • Is there any way I could replace it with the lock above?
  • What would be the ideal cylinder width for my door?
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    I think the proper term is "thumbturn" not thumbscrew. (I've edited your question accordingly.) – Daniel Griscom Feb 2 '17 at 2:43
  • @DanielGriscom much appreciated. I was incorrectly using them interchangeably. – bPratik Feb 2 '17 at 2:46
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    I think you meant to refer to the door thickness in comparison to the length of the cylinder unit. I went ahead and edited this correction into your posting. – Michael Karas Feb 2 '17 at 6:13
  • Good catch @MichaelKaras! Wonder how I could have been passing through a 5cm wide door! =) – bPratik Feb 13 '17 at 10:28
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    Did you get the lock swapped out? That one could work, but it may have needed another escutcheon for the key side.... – Jack Oct 29 '17 at 23:36

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