Mortice Deadlocks

A mortice deadlock is the highest-security standard lock for a timber front door - a key-operated bolt that shoots positively into the door frame with no spring action and cannot be retracted without the correct key. At the DIY Hardware Store, our mortice deadlocks cover the BS 3621-rated and standard versions used across UK residential security applications, in the case sizes and backsets suited to standard timber door thicknesses.

Unlike a latch (which springs back and can sometimes be slipped), a deadlock bolt is a rigid rectangular bolt that is positively driven into and retracted from the striking plate by key operation only - it cannot move unless the correct key is turned. BS 3621 rated deadlocks meet the minimum security standard required by most UK home insurers for front door security, incorporating anti-pick, anti-drill, and anti-saw features that resist common forced entry techniques.

Available in 2-lever (basic security) and 5-lever (BS 3621 rated, insurance compliant) formats, in the standard 65mm and 76mm case sizes and 45mm or 57mm backsets for different door thicknesses. Browse the range at the DIY Hardware Store.

  • Rigid deadbolt - key operation only, no spring retraction
  • BS 3621 rated 5-lever versions meet insurance requirements
  • Anti-pick, anti-drill, and anti-saw security features
  • Standard 65mm and 76mm case sizes available
  • 45mm and 57mm backsets for different door thicknesses
  • Essential security fitting for UK residential front doors