YC2100 Double-Entry Lock Cylinder, YC2100 DB 40X50 NI

Good quality Yale lock, Easy and quick to install. Works great with the Nuki Smart Lock Pro (5th Generation). this was the may reason for buying this lock as it has the emergency function so the lock can operate with a key in Both ends of the lock at the same time. Not the most secure lock but a good price. Comes with plenty of keys, 5 to be exact but if you use it with a smart lock the keys will hardly ever be used, saying that they go into the lock easily.

This seems a high quality lock with the emergency function that allows it to be opened with a key from outside, with a key inserted inside. Other similar barrels from other makers are available but only at multiples of the price paid. Key is inserted horizontally and is a little more fiddly than a traditional Yale, but this seems common to the competition. 5 keys supplied a bonus. Fitted easily. Limited barrel lengths available however.

great product and can always rely on decent quality with Yale... comes with five keys which is very useful... double entry lock perfect, easy to install

Very handy when keys left on the inside, works well. Can be a little fiddly to get the key in

Fits well, easy install

Purchased cheaper brands which gave up so went for a quality product. Works well, insurance companies rated, allows two keys to be used so if someone has left the key in the lock you can still use a key to get in and won’t be left outside knocking on the door.

After buying my locks this is the only one that was working perfectly with smart locks. Specially the Aqara U200. Highly recommended.

Keys are a bit figity to get in to the lock but love the lock due to having being able to open the door from the outside whilst a key is in the lock on the inside