Deadlock door8/2/2023 If the cylinder has the British Standard Kitemark visible on the inner edge of the door, then the cylinder has passed PAS3621. These extra locking points make it harder for opportunist thieves to pry open the door from the top or bottom. The locking system will have a minimum of 3 locking points and sometimes up to 7 points. Multipoint locking systems have multiple locking points along the length of the lock that will lock into the door frame when closed. Multipoint locking systems are great if you want to add an extra layer of protection to your exterior doors. A mortice deadlock not conforming to BS3621 standards means the lock might have only passed the manufacturers security tests and not the BSI Group’s testing. They also come in a wider variety of designs than traditional cylinder locks do.
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