Recommended for office, industrial, commercial and public environments.


ASSA dp 4400 series is a high security cylinder on patented security level, recommended for all types of mechanical locking systems. Within each master key system is it possible to specify high- and medium security cylinders as well as auxiliary cylinders and padlocks. Therefore Assa dp series is the ideal solution for all types of operations and buildings.

The CLIQ Off-line function can be added to the cylinders to provide a higher level of flexibility and security where so required, for instance perimeter protection and other important spaces where the security requirements are higher. If on-line functionality with instant and direct changes in required, the Twintronic functionality offers optimal security and flexibility to the protection of your premises.


  • dp 4400 series fulfils the requirements according to EN1303,  security grade 6.
  • Protection against physical attack
  • Protection against picking.
  • The double performance technology with scrambled combinations on both blocking elements offers optimal protection against manipulation


The Assa dp technology is protected by national and international patents against copying of keys, unauthorised use of key blanks and also cylinder components. Assa dp platform is developed with double independently working blocking mechanisms for protection against physical attack, picking and manipulation.

Different cylinder shapes (i.e. Scandinavian, Euro profile & Mortise etc.) and functions can be combined within the same locking system for mechanical, off-line and on-line cylinders.

The patented technology within the dp platform allows for creating unique parallel system solutions considering key combinations and cylinder performance. This gives the dp platform the possibility for use in both unique custom made solutions as well as traditional master key system configuration.

The dp-technology is developed for and allows for easy upgrading of CLIQ, RFID and other future technologies. Assa dp uses force controlled horizontal blocking elements for increased operational security and usage in aggressive environments where risk of freezing and condensation is high. Using force controlled horizontal blocking elements also reduces the friction and minimises the wear and tear of the keys and cylinder components.

ASSA dp 4400 can be combined with ASSA dp 2400 series for doors where the security demands does not require approved locking.

dp 4400 serien (.pdf, 552 kB)

Published 16 Jul 2008



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