Gerda PRO System cylinder (WKM4) 30/50 brass, class 6 D, box

GERDA Pro System Anti-Burglary Cylinder ? Unparalleled Door Security

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

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


• Certificate issued by the Institute of Precision Mechanics


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


• Over 2,700,000 key code combinations


• Highest security class ? 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)


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


• Recommended for fire-resistant doors


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


• Anti-picking protection (two additional top latches)


• Anti-bumping pins to prevent unauthorized entry via bumping methods


• Additional anti-burglary bar


• New double-diameter pins


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

How to choose the right cylinder size?

Watch the video below.

Valued Customers, Please Make Informed Purchases

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

Due to the nature of the product, we cannot accept returns of opened or damaged packaging as we cannot resell such items.

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

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