From a bs 3621 2007 mortice lock union strongbolt has a unique chamfered bolt design which increases the performance of the lock under side load attack.
5 lever mortice sash lock bs3621.
The best most secure 5 mortice lock is a lock that is kitemarked to british standard bs 3621.
Bs3621 is a lock standard by british standards institute bsi for thief resistant locks bs 3621 locks are found on some front and back doors in the home and it s a good way to check that your security is up to standard.
In addition the hardened steel pins within the bolt construction provide resistance from sawing and the shape of the bolt also provides little opportunity for destructive tools to make.
This is why some insurance companies require door locks are fitted to bs 3621 british standard.
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A kitemarked british standard lock ensures the mortice lock has been tested against burglary techniques such as drilling.