• Resilient and extremely durable
• Springless technology.
• Overlapping curve system
• Patent protection until 2037
• The access system for highly complex master key systems

You can always rely on 4KS. Thanks to its high levels of resistance the system also locks and unlocks in the toughest conditions. Even after years, it works like 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.

And not just that. 4KS also offers extensive expansion capabilities, which enables the implementation of highly complex master key systems. 4KS is ideal for locking 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. 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, massive locking pins are brought into a specific position via positive control of the 6 key curves and scanned by 2 control bars. As a result of the key‘s overlapping curve key cut it is virtually tamper-proof.

Copy keys, additional cylinders and lock charts are available from authorised EVVA Partners but only with corresponding proof of legitimacy, the EVVA security card. The reliable technologies of the 4KS cylinder provide sustainable protection against illegal opening methods. It offers excellent burglary protection with plug pulling, drilling and breakaway protection and a comprehensive range of cylinders, so that even the garden shed can be secured with a 4KS padlock, and all cylinders can be integrated into a master key system. This has the benefit that: One key locks everything.