4KS represents the consistent development of our tried and tested curve system. 4KS is even more robust, stronger and more secure. Its new design stabilises the key, making it more compact and ergonomic. Thanks to the new drilling protection 4KS complies with the strictest security category as per EN-1303:2015. Which features have remained? 4KS remains the reliable system suitable for the toughest conditions.

In contrast to other master key systems, the locking elements in 4KS cylinders slide along the curve key cuts on the key. It is no longer necessary to apply force against the spring resistance. A total of 12 springless, solid sliders are brought into a specific position via positive control of the six key curves and scanned by two control bars. A bottom bar in the plug controls the additional coding of the key. The 4KS key is scanned a total of four times. That means three times more scans than with conventional pin systems and therefore offers maximum security.

As a reversible key with unique rounded tip, the 4KS key is particularly easy to use. The high-quality nickel-silver alloy of the key, the anti-friction coating of all locking elements and the springless technology of the 4KS key guarantee high wear resistance even in the toughest conditions. The special features of the 4KS key is the overlapping curve key cuts. It practically rules out key manipulation within the master key system. The additional coding also provides highest security.

Patent protection

All EVVA products are only available at authorised EVVA Partners. EVVA is authorised to take legal action against any kind of patent infringements. 4KS has a maximum patent protection until 2036.