If someone left a key on the inside of a lever tumbler lock, is it realistically possible for someone arriving from the outside with a correct key to push the inside key out and unlock the door? What if the person were ‘careful’ to ensure the inside key was vertical? : Locksmith


With pin tumbler locks, no. They have two completely separate cylinders in North America, and two separate plugs in the same cylinder in Europe (typically). There are no connections between both save for the meshing of cams and such. That means that a key inserted inside does not even reach the tip of where the outside key goes.

In North America, leaving a key inside does not usually prevent someone from using a key outside. I have a double cylinder deadbolt on my house door and typically always leave a key in the inside cylinder and it does not affect the operation of the outside cylinder. If I had the inside key on a heavy ring of keys, maybe, but I doubt.

In Europe (with profile cylinders), leaving a key inside, if it is turned, will prevent the outside cylinder from operating because the cam will not be lined up correctly to permit the outside plug to work.

If you’re talking about the rather inexpensive mortise locks that use a bit key, those share the same mechanism for inside and outside, and it can be done provided the inside key is in the neutral position. If the inside key has been turned, then you must turn it back to neutral before pushing it in further to make room for the outside key. These locks don’t have the keyhole in the lever, but on the door usually below the lever (or knob).



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Converting Tumbler Lock To Keypad?


Converting Tumbler Lock To Keypad?

Hey Locksmiths,

Curious question. Is it possible to convert a tumbler lock like this to a keypad system?

edit: after more research, it looks like an electronic cam lock is what I'm after

https://preview.redd.it/ccmt3kxp9hw41.jpg?width=1500&format=pjpg&auto=webp&s=3568d804edc9e36aa0c2c9aca4cfc251d42b9621

https://preview.redd.it/bry29kxp9hw41.png?width=266&format=png&auto=webp&s=6ad2b3f208c4b9de1d0e2e826ac00644e7c72875

submitted by /u/Kegath
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