Gerda PRO System cylinder (WKM4) 35/35 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 system for mortise locks, offering superior protection against intruders. This anti-bumping and anti-drilling cylinder safeguards your home with exceptional reliability. The GERDA WKM4 cylinder has been tested by the Institute of Precision Mechanics in Warsaw, in accordance with 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-proof 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: 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)


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


• Recommended for fire-resistant doors


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


• Anti-picking protection (two additional upper latches)


• Anti-bumping pins to prevent unauthorized opening using the bumping method


• 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 Make Informed Purchases

We are committed to your satisfaction and the highest safety standards. Therefore, 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 packaging, as we cannot re-introduce such products into our sales cycle.

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 offerings.