Gerda PRO System cylinder (WKM4Z) 40g/30 tooth satin nickel, box

GERDA Pro System Anti-Burglary Cylinder ? Unrivaled Door Security

The GERDA Pro System anti-burglary cylinder is a high-security lock insert designed for mortise locks, providing superior protection for your home. This anti-bumping and anti-drilling cylinder effectively deters intruders. The GERDA WKM4 cylinder has been tested by the Institute of Precision Mechanics in Warsaw, in accordance with 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 and smoke-resistant doors. GERDA Pro System door cylinders are available in: satin nickel and brass finishes, and with a knob, thumbturn (WKM4), and a 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


• Highest corrosion and temperature resistance -20/+80 degrees Celsius ? Class C (highest)


• Resistance to attack: Class D ? highest (5/10 min. drilling 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-bumping pins to prevent unwanted opening by bumping


• Additional anti-burglary bolt


• New double-diameter pins


• Includes 5 high-security keys, a key code card, screw, and attractive 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. Therefore, all certified cylinder locks are packaged in sealed boxes to guarantee their undamaged condition and full functionality.

Due to the product's nature, we cannot accept returns of opened or damaged packaging, as these products cannot be re-sold.

Please carefully review the technical specifications and precisely measure your door before purchasing. If you have any questions or concerns, our team is available to assist you in choosing the right product.

Thank you for your understanding and we invite you to explore our range.