The ATK 3 Star Diamond Cylinder

Upgrade your Endurance® Door to the highest rated security cylinder.

UK’s highest accredited lock range.

Introducing the ATK 3 Star Diamond Cylinder.

Upgrade your Endurance® Door to the highest rated security cylinder.

ATK is a euro cylinder with the Master Locksmith Association's highest rating - SS312 Sold Secure Diamond, TS007 3 star rating, British Kitemark and Secured by Design accreditations.

The patented locking cam system of the ATK lock is proven in the market to effectively combat against lock snapping and forced entry methods of attack.

All sizes have the TS007 3 star British Kitemark.


The ATK 3 Star Diamond Cylinder comes with optional “Click Secure” Thumbturn. Featuring a positive click turn action for total security and Document Q compliance.

What is Document Q compliance?

Document Q is an approved government document which specifies the level of security required for doors and windows in new builds. The new update applies only to work started after October 1 2015. Projects with planning permission submitted before October 1 2015 are also exempt providing the work is started on site before October 1 2016. For more information see our blog post.

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  • British Kitemark Standard
  • Secured by Design Accredited
  • Patented Snap Secure Technology
  • Pick, Drill & Bump Resistant
  • Advanced pick resistance with anti-drill pins

Available in sizes from 30-60mm in 5mm increments for both internal and external parts of the cylinder.