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.
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