Gerda PRO System cylinder (WKM4) 40/50 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 that works with mortise locks, offering superior protection against intruders. This anti-bumping and anti-drilling cylinder safeguards your home. The GERDA WKM4 cylinder has been tested by the Institute of Precision Mechanics in Warsaw according to PN-EN 1303:2015-07, 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 and brass finishes, and with a knob, thumb turn (WKM4), or 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, 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)


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


• Recommended for fire-rated doors


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


• Anti-picking protection (two additional upper latches)


• Anti-picking pins preventing unwanted opening via bumping


• Additional anti-burglary bolt


• 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 Choose Wisely

We are committed to your satisfaction and the highest safety standards. 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 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 choosing the right product.

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