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Locking system DUplus with 3D key sections

DUplus is the innovative advancement of the proven DU system, based on the tried-and-tested double undercut principle. In DUplus, the undercut is interrupted, clearly visible on the key profile – a key feature for technical protection against unauthorised key duplication.

Inside the cylinder, four additional pins verify the shape and position of the interrupted undercut, providing a four-way profile check that significantly increases the overall security level.

The system was developed for demanding property applications and meets the highest requirements in terms of security, flexibility, and system integration. DUplus supports complex master key systems, is compatible with electronic locking solutions, and available in a variety of finishes and profiles. Whether for new construction or modernisation – DUplus is your long-term, future-proof  solution for secure access control.

CES Schließsystem DU für den Objektbau

System description

  • Patent protection expected up to 2043
  • Hardened steel plug and housing pins (as additional protection against
    drilling)
  • At least one housing pin and all core pins are made of hardened steel (as additional drilling protection)
  • Anti-scanning feature with specially designed housing pins to effectively protect against picking-tools
  • Guiding groove ensures positive transfer of key torque
  • Strong nickel silver key designed to suit armoured escutcheons




  • Extremely varied, legally and technically protected profile
  • Large family of profiles to suit the most complex multi-site master key
    systems
  • Also available in British and Scandinavian housing profiles (UK oval)
  • With security card
  • Available in a wide range of factory controlled in-house finishes
  • Modular version available
  • Fully compatible with CES electronic locking solutions

Locking elements

Interrogation element for the undercut

High level of copy protection 
CES Schließsystem DU für den Objektbau mit doppelter Sicherheitsabfrage

Inside the cylinder, four additional pins check the undercut and its interruption. Working in combination, these features significantly increase the overall security level.

Lateral encoding

                                                                 Increased safety made visible               
CES Schließsystem DU für den Objektbau mit seitlicher Codierung

Up to four horizontally positioned control pins are integrated as additional security-relevant features.

Anti-drilling, anti-pulling protection

Additional security
CES Schließsystem DU für den Objektbau mit Bohr- und Ziehschutz

The optional drilling and pulling protection provides increased resistance against the forced removal of the cylinder.

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