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

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

The GERDA Pro System anti-burglary cylinder is a high-security lock cylinder designed for mortise locks, offering unparalleled protection for your home. This anti-bumping and anti-drilling cylinder effectively deters intruders. The GERDA WKM4 cylinder is rigorously 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 locking pins, exceeding 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, superior mechanical attack resistance)


• Recommended for fire-resistant doors


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


• Anti-picking protection (two additional upper latches)


• Anti-picking pins to prevent unauthorized opening via bumping


• Additional anti-burglary pin


• New double-diameter pins


• Includes 5 high-security keys, key code card, screw, and elegant packaging.

How to choose the right cylinder size?

Watch the video below.

Valued Customers, Please Make Informed Purchases

We are committed to your satisfaction and the highest security standards. All our certified cylinder locks are packaged in sealed boxes to guarantee their integrity and full functionality.

Due to the nature of the product, we cannot accept returns of opened or damaged packages, as these products cannot be resold.

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 range of products.