What is a Deadbolt Lock?

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 What is a deadbolt lock? What are the different types available? Here we take a deeper look.


Deadbolt lock definition 

A deadbolt lock is a lock bolt that is moved by turning a key or an access control system without the use of a spring. Deadbolt locks are heavier and thicker than your standard spring latch. Normally made from steel or brass they are not rounded or angled at the end of the lock. A deadbolt lock can be a cost-effective way to improve your home security. 


How does a deadbolt lock work?

Because deadbolt locks operate without the use of a spring, simply turning a key retracts or extends the bolt into the strike plate on the door frame.

As they’re not spring-operated, this makes them much harder to be jimmied open with a crowbar or other device. Thanks to the strong locking mechanism, deadbolts offer an extra layer of resistance and strength compared to other locking mechanisms.

There are three types of deadbolt lock:


Euro Cylinder And Turn

The euro/turn deadbolt is the most common form of deadbolt lock and is the simplest mechanism.

It’s opened from the exterior side with a key, which will retract the bolt from the door. There’s no key required to open from the interior side - it’s opened with a thumb turn mechanism.

As it doesn’t require a key to be opened from the inside, a single cylinder deadbolt shouldn’t be placed on a door with breakable glass panes near the lock, or a large letter plate – an intruder could simply reach in and open the door. Our winter security tips offer some easy ways you can protect your home from intruders during the winter months.


Double Cylinder

A double cylinder deadbolt, on the other hand, is opened with a key on both sides of the door.

This provides that extra layer of security if there are glass panes close to the doorknob, as it wouldn’t be possible to open the door without a key, even on the inside.

However, it’s worth remembering that double cylinder locks can act as a fire hazard. In case of emergency, the key must be found in order to exit the door. For more information on fire safety read our fire door requirements blog.  


5 Lever BS3621

British standard 5 lever deadlocks conforming to BS3621 are the most secure option. These are insurance approved locks operated by a key from both sides.

These are often found being used in addition to a Yale type night latch on a timber front door.

Deadbolt locks are a simple and affordable way to improve your home security. Of course, they’re not the only measure you should take. Contact us today for further advice.