[Translate to International:] Webbanner 4KS Bürogebäude und Schlüssel

4KS - The Stable Locking System from EVVA

More robust. Stronger. More secure.

You can always rely on 4KS. Thanks to its high level of resilience, the system also locks and unlocks in the toughest conditions. Even after years, it works like it did on the first day. This makes 4KS your first choice for the toughest conditions – at high altitudes or in production facilities subject to high amounts of dirt. What's more, 4KS also offers extensive upgrade opportunities which enables the implementation of highly complex master key systems.

The benefits of 4KS at a glance

  • Resilient and extremely durable
  • For highly complex master key systems
  • Springless technology
  • Patent protection until 2037 at the latest
    according to EP3426865. For country-specific patent protection, see worldwide.espacenet.com


[Translate to International:] Universität Wien, AT
The access system for highly complex master key systems

4KS is ideal for master key systems with a complex structure and a large number of different user groups. Such as universities, shopping centres, retail chains and industrial companies. In cooperation with qualified partners, EVVA has been providing security technology for a hundred years.

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4KS. For the toughest conditions
The 4KS system consists of a few individual parts and is springless, therefore maintenance-free and extremely durable even in continuous use. Whether high up on the mountain or in production facilities with high levels of dirt, 4KS is made for the toughest jobs.
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Smooth-action key
Thanks to the curves, the key is also extremely easy to insert and turns easily and quietly in the cylinder.
[Translate to International:] Hinten-rechts-oben (HRO)
Double cylinder
are suitable for interior and exterior doors and can be equipped with numerous versions and options.
[Translate to International:] Vorne-links-oben (VLO)
Half cylinder
suitable for barriers, key switches, lifts and numerous other situations.
[Translate to International:] Vorne-links-oben (VLO)
Furniture cylinders
make sure that important documents are securely archived.
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efficiently integrate external objects into the access system
[Translate to International:] Vorne-links-oben (VLO)
Switch cylinders
as machine switch or on control panels for electronic systems
[Translate to International:] Vorne-links-oben (VLO)
Cam locks
for mailbox systems and for secure storage in showcases and display cabinets.
[Translate to International:] Hinten-rechts-oben (HRO)
Thumbturn cylinder
allows convenient opening and closing without keys.
[Translate to International:] Vorne-links-oben (VLO)
Switch cylinder
operate control elements such as those in lift systems.
[Translate to International:] 4KS-Schnittzylinder
4KS. One system, many details

In contrast to other master key systems, the locking elements in 4KS cylinders slide along the curve key cuts on the key. A total of 12 springless, solid locking pins are brought into a specific position via positive control of the 6 key curves and scanned by 2 control bars. The key's overlapping curve key cut makes it virtually tamper-proof.

[Translate to International:] 4KS-Designschlüssel mit Farbpunkten
Practical, handy and appealing

MCS keys are available in many different colours. The colour coding helps to easily distinguish between keys.

[Translate to International:] Sicherungskarte freigestellt
All-round protection

Copy keys, additional cylinders and lock charts are available from authorised EVVA Partners only upon providing proof of legitimacy, i.e. the EVVA security card.

[Translate to International:] Bohrer vor Zylinder
Benefit from the security features

The reliable technology of the 4KS cylinder offers lasting protection against illegal opening methods.

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