Gerda PRO System cylinder (WKM4) 55g/30 nickel, class 6 D, box

GERDA Pro System Anti-Snap Cylinder ? Unparalleled Door Security

The GERDA Pro System anti-snap cylinder is a high-security lock cylinder designed for mortise locks, offering superior protection against intruders. This anti-bumping and anti-drilling cylinder safeguards your home with exceptional reliability. The GERDA WKM4 cylinder, tested by the Institute of Precision Mechanics in Warsaw according to PN-EN 1303:2015-07, boasts a superior classification: 1 6 0 B 0 C 6 D. This GERDA Pro System cylinder is approved for use in fire and smoke-proof doors. GERDA Pro System door cylinders are available in: satin nickel, brass and versions with a knob, thumb turn (WKM4), and a gear (WKM4Z).

• Cylinder classification according to PN-EN 1303: 2015-07: 1 6 0 B 0 C 6 D


• Certificate issued by the Institute of Precision Mechanics


• Exceptional mechanism durability ? 6 pins, exceeding 100,000 cycles


• Over 2,700,000 key code combinations


• Highest security rating ? 6


• Highest burglary resistance ? Class C (high) according to KT/402/IMP/2014


• Exceptional corrosion and temperature resistance -20/+80 degrees Celsius ? Class C (highest)


• Attack resistance: Class D ? highest (5/10 min. drill resistance, resistance to mechanical attack)


• Recommended for fire doors


• Anti-drilling protection (internal cylinder protected by a hardened steel plate)


• Anti-picking protection (two additional upper latches)


• Anti-picking pins to prevent unauthorized opening using bumping methods


• Additional anti-snap security bar


• New double-diameter pins


• Includes 5 high-security keys, a code card, screw, and elegant packaging.

How to choose the right cylinder size?

Watch the video below.

Valued Customers, Please Choose Wisely

We are committed to your satisfaction and the highest security standards. Therefore, all our certified cylinder locks are packaged in sealed boxes to guarantee their pristine condition and full functionality.

Due to the product's nature, we cannot accept returns of opened or damaged packaging, as these products cannot be resold.

Please carefully review the technical specifications and precisely measure your door dimensions before purchasing. If you have any questions or concerns, our team is available and happy to assist you in selecting the right product.

Thank you for your understanding and we invite you to explore our range of products.