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

GERDA Pro System Anti-Burglary Cylinder ? Superior Door Protection for Every Home

The GERDA Pro System anti-burglary cylinder is a complementary security solution for mortise locks, offering superior protection against intruders. This anti-bumping and anti-drilling cylinder safeguards your home with advanced security features. The GERDA WKM4 cylinder has been rigorously tested by the Institute of Precision Mechanics in Warsaw, achieving a rating of 1 6 0 B 0 C 6 D according to the PN-EN 1303:2015-07 standard. 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, thumb turn (WKM4), and gear (WKM4Z) options.

• 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 (inner cylinder protected by a hardened steel plate)


• Anti-picking protection (two additional top latches)


• Anti-drill pins to prevent unwanted opening via bumping


• 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 Choose Carefully

We are committed to your satisfaction and the highest safety standards. All our 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 are unable to 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 and we invite you to explore our product range.