Gerda PRO System (WKM4) cylinder insert 40/50 satin nickel, class 6 D, box

GERDA Pro System Anti-Burglary Cylinder ? Unmatched Door Protection

The GERDA Pro System anti-burglary cylinder is a complementary security measure 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 has been tested by the Institute of Precision Mechanics in Warsaw according to the PN-EN 1303:2015-07 standard, achieving a classification of 1 6 0 B 0 C 6 D. The 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


• 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 unwanted opening via bumping


• Additional anti-burglary pin


• New dual-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 safety standards. Therefore, all certified cylinder locks are packaged in sealed boxes, guaranteeing their undamaged condition and full functionality.

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

Please carefully review the technical specifications and accurately 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.