Gerda PRO System cylinder (WKM4) 35/40 satin nickel, class 6 D, box

GERDA Pro System Anti-Burglary Cylinder ? Uncompromising Door Security

The GERDA Pro System anti-burglary cylinder is a high-security locking solution designed for mortise locks, providing superior protection against intruders. This anti-bumping and anti-drilling cylinder safeguards your home with exceptional reliability. The GERDA WKM4 cylinder has been rigorously tested by the Institute of Precision Mechanics in Warsaw, meeting the requirements of PN-EN 1303:2015-07 and achieving a classification of: 1 6 0 B 0 C 6 D. The GERDA Pro System cylinder is approved for use in fire and smoke-resistant doors. GERDA Pro System door cylinders are available in: satin nickel, brass finishes, and with a knob, thumbturn (WKM4), or gear (WKM4Z).

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


• Certified by the Institute of Precision Mechanics


• Exceptional mechanism durability ? 6 pins, over 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


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


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


• Recommended for fire doors


• Anti-drilling protection (inner cylinder secured with a hardened steel plate)


• Anti-picking protection (two additional upper latches)


• Anti-picking pins to prevent unauthorized opening via bumping


• Additional anti-burglary bar


• New double-diameter pins


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

How to choose the right cylinder size?

Watch the video below.

Valued Customers, Please Choose Carefully

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

Due to the product's nature, please note that we cannot accept returns of opened or damaged packages as we cannot re-introduce such products back into circulation.

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

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