Gerda PRO System cylinder (WKM4) 35/50 brass, class 6 D, box

GERDA Pro System Anti-Burglary Cylinder ? Unrivaled Door Protection

The GERDA Pro System anti-burglary cylinder is a high-security door lock insert designed for mortise locks. This anti-bumping and anti-drilling cylinder provides superior protection against intruders, safeguarding 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 1 6 0 B 0 C 6 D classification. The GERDA Pro System cylinder is approved for use in fire and smoke-proof doors. GERDA Pro System 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


• 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 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)


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


• Recommended for fire doors


• Anti-drilling protection (inner 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 bar


• New double-diameter pins


• Includes 5 high-security keys, code card, screw, and attractive 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. All of our certified cylinder locks are packaged in sealed boxes to guarantee their integrity and full functionality.

Due to the nature of this product, please note that 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 to assist you in selecting the right product.

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