Lock cylinder protrusion

[Jupiter01]

How much should the lock cylinder protrude on either end please? I appreciate that a compromise may be required based on available sizes but is there a best practice?

 

[Burnerman]

Keep the cylinder flush with the handle plate wherever possible......it saves the lock being 'bumped' i.e smacked with a hammer. All sizes are available, but not always from the sheds, I've found.
John

 

[SFK]

As Burnerman says, as flat as possible outside or someone can snap it.

Inside looks best if flat but does not matter if it protrudes (as I had to do on one door could only match out side measurement, but not both outside and inside).
I use handlestore.com to get Euro locks (not cheapest, but have all the sizes for both sides - except for one of my doors)

 

[Jupiter01]

Thanks guys. This was a great help.

 

[crank39]

Seeing as the cylinder sizes come in 5mm increments if you have one that protrudes 5mm then its easy you just buy the next size down, however due to the location of the lock mech within the door sometimes the cylinder only protrudes 2.5mm so if you were to buy the next size down it wouldn't extend through the handle at all, it would sit below the surface.......which is wrong, I think this is the question you were asking and wanted an answer to, my answer is flush is best IF the cylinder size allows, if it protrudes 2.5mm then that is borderline fine, you'd struggle to get mole grips to bite on 2.5mm, a proper snapper like mine needs even more than 5mm protrusion to get a grip, cylinders that don't reach the handle or if you can see a gap and into the handle is just plain wrong

 

[JohnD]

you can get armoured cylinder guards, usually a flat piece of painted or plated steel that fits on the outside of the door encasing the end of the cylinder, fixed with steel screws to a similar plate on the inside. They are very resistant to cylinder snapping, and can also be used on a wooden door without multipoint, to spread the load of a force attack.

Some also have a hole for the handle, if there is one, as well as the keyhole or cylinder.

Sometimes sold under the "kickstop" brand or as "lock guards"

If the cylinder end is concealed in a common plastic or pressed aluminium handle or shroud, it is easily broken away to grab the end of the cylinder