This particular type of cylinder lock is key operated externally and has an internal knob, called a thumbturn. Different styles are available, depending on the manufacturer. The internal thumbturn mechanism will enable you to easily lock and unlock the door from inside, if required, while allowing access from outside with the key. This prevents accidental lockouts caused by the key being left in the back of the door, and allows for emergency exit.
FAQ Categories Archives: Choosing Door Hardware
You should always change the locks on your new home, not only to comply with your insurance requirements but for the safety of you and your family. Do you know if you have been given all the keys to your new property? Is it worth the risk? With any type of security it is normally a one off payment, once your secure your secure. It is not like a car which you have to service and MOT every year.
A multi-point locking system is generally found on PVC doors but are also found on wooden, composite and aluminium doors and comprise of a minimum of three locking points that all lock simultaneously by lifting the handle and/or turning the key and if they are a main entrance, then for insurance purposes you will need a lock cylinder with at least five pins.
Different insurance companies have different requirements regarding French windows / double back doors. Some ask just for a 5 lever British Standard BS3621 mortice lock fitted to the first opening door (leaf), either a sashlock or a deadlock. A sashlock is a lock which has a latch as well as a bolt and works with a pair of handles and a key from both sides. A deadlock is just a bolt and is key operated from both sides. On the second opening door (leaf) they ask for key operated bolts fitted at the top and bottom of the door. Other insurance companies require you to have key operated bolts at the top and bottom of both doors as well as any lock, 2 or 3 lever deadlock or sashlock normally in the middle of the door. Lastly your insurance company may require you to have both a 5 lever British Standard BS3621 mortice lock and key operated bolts fitted top and bottom of both doors (leafs).
Different insurance companies have different requirements regarding back doors. Some ask just for a 5 lever British Standard BS3621 mortice lock, either a sashlock or a deadlock. A sashlock is a lock which has a latch as well as a bolt and works with a pair of handles and a key from both sides. A deadlock is just a bolt and is key operated from both sides. Other insurance companies require you to have key operated bolts at the top and bottom of the door as well as any lock, 2 or 3 lever deadlock or sashlock normally in the middle of the door. Lastly your insurance company may require you to have both a 5 lever British Standard BS3621 mortice lock and key operated bolts.
Most PVC doors are fitted with a multi-point locking system. This is a lock that when you lift the handles up, throws locking devices from the lock mechanism in the door into strike plates situated on the frame. You also need to turn the key in the cylinder to fully lock the door which also prevents the handles from moving and unlocking the lock.
Traditionally on a wooden front door you would have a rim lock/ Nightlatch, often referred to as a Yale lock, which is normally fitted around shoulder height for convenience opening the door and latches shut when you close the door. You should also have a 5 lever British Standard BS3621 mortice deadlock, often referred of as a Chubb lock, ideally fitted on the lower third of the door. You need a 5 lever British Standard BS3621 deadlock for your own safety and to comply with your contents insurance policy.
A 5 lever British Standard BS3621 mortice deadlock is a lock which is required by insurance companies to be fitted to all external wooden doors. It is morticed, cut into, the edge of the door and is operated by a key from both sides. The deadbolt, which is thrown by the key, engages into a strike plate which is fitted to the door frame. There are certain features a deadlock has to have to be a British Standard deadlock. They must have at least 5 levers, levers are what the key has to move up in order for you to throw the bolt, lock or unlock the lock. There must also be a curtain, bolt thrower, which protects the levers from being manipulated and the lock being picked open. The bolt must have some form of hardening, some locks have hardened pins running through the bolt whilst some manufacturers make the entire bolt hardened, meaning you can not cut through the bolt with a hacksaw. The bolt which is thrown by the key and engages into the strike plate must be of a certain size and length. A deadlock must also have hardened plates attached to the body of the deadlock to prevent anyone drilling through the door into the lock with a standard drill bit. Lastly the strike plate, which is fitted to the door frame and the bolt engages into, must be a boxed strike plate and of a certain size.
A mortice deadlock is a lock which is morticed, cut into, the small edge of a door and is operated with a key from both sides. When the key has been turned to lock the lock a bolt is thrown which can not be pushed back into the lock, you need a key to unlock the lock. There are many different manufacturers of mortice deadlocks each making numerous styles and quality of deadlocks like Yale mortice deadlocks, Ingersoll mortice deadlocks, Era mortice deadlocks, Banham mortice deadlocks, union mortice deadlocks, Asec mortice deadlocks, Legge mortice deadlocks to name just a few. For internal doors you generally have a 2 or 3 lever deadlock fitted as internal doors are often thinner than an external front door. For external doors you should have a 5 lever British Standard BS3621 insurance approved deadlock fitted as these need to be higher security to prevent a burglary.
Chubb was a manufacturer of locks. The Chubb brand has recently been incorporated with Yale locks and Union locks as they are all owned by the same company, Assa Abloy. Chubb made rim locks, deadlocks, window locks and other secondary security products like key operated locks, door chains etc. People often call a mortice deadlock a Chubb lock. A mortice deadlock is a lock which is morticed, cut into, the edge of the door and is operated by a key from both sides. When you turn the key to lock the lock a deadbolt is thrown and engages in the strike plate which is fitted to the door frame. Once the bolt has been thrown it can not be pushed back into the lock with your finger unlike a latch.