Gerda PRO System cylinder (WKM4) 30/40 brass, class 6 D, box

GERDA Pro System Anti-Burglary Cylinder ? Unmatched Door Security

The GERDA Pro System anti-burglary cylinder is a high-security lock insert 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 PN-EN 1303:2015-07 standard and achieving a 1 6 0 B 0 C 6 D classification. 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 and brass finishes, and with knob, thumbturn (WKM4), and gear (WKM4Z) options.

• Cylinder classification according to PN-EN 1303:2015-07 standard: 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


• 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-resistant doors


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


• Anti-picking protection (two additional upper latches)


• Anti-picking pins to prevent bumping


• Additional anti-burglary bar


• New double-diameter pins


• Includes 5 high-security keys, code card, 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 safety standards. Therefore, all our certified cylinder locks are packaged in sealed boxes to guarantee their pristine condition and full functionality.

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

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. We invite you to explore our range of products.