A British Standard 5 Lever Deadlock is a mortice lock that conforms to British Standard BS3621. It has a deadbolt only which is operated by key. BS Deadlocks are specified by Insurance Companies and also recommended by the police for use on front doors.
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British Standard BS3621:2007 locks should be fitted to all external doors to comply with insurers requirements. To meet BS3621:2007, a must (in addition to other requirements):
Have at least 1000 key differs
Have at least 5 levers (with anti-picking features such as false notching)
Have a bolt with a minimum throw of 20mm
Feature anti drill plates on both sides of the lock
