ERA Fortress British Standard Deadlock BS3621:2004 High Security Mortice Lock The new High Security Fortress Lock range reinforces ERAs position as the UKs largest producer of mortice locks. The new Fortress range fully complies with both the European (BS EN 12209) and British (BS3621:2007) standards. Further recommendation from the police-endorsed Secured by Design programme guarantees insurance companies exacting criteria is not only met but exceeded. Available in sashlock and deadlock versions, with hardened steel plates to defend against drilling and two hardened steel plates in the deadlock to resist hacksawing. All the locks come complete with full fitting instructions.