Just like single door locks you will also require to use the key to lock the door.
Single vs double cylinder door lock.
Single sided deadbolts have a knob on the inside that is used to unlock and lock them from the inside.
Double cylinder locks is the number of cylinders.
The single cylinder deadbolt is the most common.
A thumb turn opens it from the inside.
Single cylinder locks are more common than double cylinder.
It ensures more security as unlocking from one.
There is no thumb turn mechanism on a double cylinder lock.
Without a button lock mechanism intruders cannot unlock the door manually.
These locks require a key to lock or unlock the door both from the outside and the inside making them a little safer in one regard.
For example if there s a window on or nearby the door think of sidelight windows next to a door for example someone could break the window reach in and turn the deadbolt of a single keyed lock.
Instead the door is locked or unlocked using a thumb turn style lever.
A single cylinder has a keyed entry on one side while a double cylinder has keyed entries on both sides.
The two main reasons for this are efficiency and economy.
One important disadvantage is the extra safety concern.
It is found on front or back exterior doors and requires a key to open it from outside.
As already mentioned single cylinder locks are more common than double cylinder.
On the other hand single sided deadbolts require key to unlock from the outside only.
It means that you will need to use the key to unlock the door no matter which side you are on.
A key is required for locking and unlocking from both the exterior and the interior of the property.
A double cylinder deadbolt has no thumb turn.
Telling the difference between a single cylinder and double cylinder deadbolt is a simple task even for the untrained eye.
Double cylinder locks are an extra layer of protection for home and business security.
This prevents intruders from entering and exiting easily.
The number of cylinders inside a lock translates to the number of keyed entries on the door.
Single cylinder deadbolts are the commonest type in most homes.
Double cylinder locks contain two cylinders.
Single and double cylinder deadbolts and door locks single cylinder deadbolts and handlesets are operated with a key from the outside but do not require a key for locking or unlocking from the interior of the property.
Double cylinder deadbolts are locks that require a key to open from both the inside and outside.
Replacing single cylinder locks with double cylinder models may reduce successful break ins by 50 or more.
Double cylinder door locks.
The difference is that you need to lock the door from both inside and outside with the key.
A single cylinder deadbolt has a slot for a key on one side while the other side features a knob or turning mechanism of some sort usually a thumb turn that looks like a simple lever that turns much like a key would.
