Locksmiths: jargon-buster

Auto locksmiths
If you get locked out of your car, auto locksmiths can cut a new car key and re-activate your vehicle's central locking system.

Auxiliary lock
An auxiliary lock is the name given to any additional lock that locksmiths fit to a door that has an existing lock already fitted.

Bitting
The bitting is the part of the key that actually engages and activates the lock. Bittings are often represented by a code, which shows locksmiths how to cut the key.

Cylinder lock
A cylinder lock is made with a cylinder that locksmiths can easily unscrew when rekeying.

Impressioning
This is a method locksmiths use to make new keys for a lock, without having to take the lock apart.

Key blank
A key blank is a key that has not yet been cut. Locksmiths typically stock blanks for duplicating keys.

Lock picking
Lock picking is the act of unlocking a lock by analysing and manipulating the components of the lock device, without the original key. Although lock-picking is associated with criminals, it is an essential skill for locksmiths.

Mortise lock
A mortise lock is one that requires a pocket—the mortise—to be cut into the door or piece of furniture in which the lock is to be fitted.

Plug
The plug is the part of the lock that you put the key into, and which turns to operate the lock.

Re-keying
When locksmiths rekey (change) a lock, they replace the tumblers in the lock cylinder. The lock will then require a different key to operate. This is a good idea if you have just moved in to a property or lost a set of keys.

Tumblers
These are the parts inside a lock (key lock or safe lock) that have to be aligned to precise positions in order for the lock to operate.

Warded lock
A warded lock, also called a "ward lock", is a type of lock that uses a set of wards, or obstructions, to prevent the lock from opening unless the correct key is inserted. This is one of the most ancient lock designs still in modern use.

Locksmith tips:

• Make sure the locksmiths you call are members of the British Locksmiths Association.
• Ask the locksmiths for a quote over the phone and check whether you will have to pay a call-out charge.