Gerda PRO System WKM4 Cylinder Lock 40/40 Brass Class 6D Anti-Drill Fire Approved

Product Overview

Gerda PRO System (WKM4) 40/40 brass cylinder is an anti-burglary lock insert designed for use with mortise locks in residential and commercial doors. It is tested to PN-EN 1303:2015-07 and certified by the Institute of Precision Mechanics in Warsaw, achieving classification 1 6 0 B 0 C 6 D and high break-in resistance. This model is approved for installation in fire-rated and smoke-control doors, working reliably across temperatures from -20°C to +80°C.

Distinct from standard cylinders, the WKM4 provides anti-bumping and anti-drill protection via hardened internal plates and pins. This feature reduces risk for facility managers and property owners by satisfying fire and security regulations without additional modification. Particularly well-suited for bulk procurement in mixed-use developments, security upgrades, or fire safety retrofit projects.

Key Features

• Anti-bumping protection ? internal pins prevent unauthorized opening by bumping methods


• Certified burglary resistance ? class C (KT/402/IMP/2014) for high security applications


• Anti-drill hardened plate ? internal steel plate shields against drilling attacks (class D, 5/10 min. drill resistance)


• PN-EN 1303:2015-07 certified ? meets European standards for cylinder locks in safety-critical doors


• Fire and smoke door approval ? permitted for use in fire-rated and smoke-control doors according to national regulations


• High durability ? rated for over 100,000 operating cycles, minimizing maintenance intervals


• 2,700,000 key code combinations ? advanced key design minimizes risk of key duplication

Technical Specifications

• Lock Type: Cylinder insert for mortise locks


• Length: 40/40 mm


• Material: Brass


• Classification: 1 6 0 B 0 C 6 D (PN-EN 1303:2015-07)


• Certification: Institute of Precision Mechanics Warsaw


• Resistance Class: C (burglary), D (drill/mechanical attack)


• Durability: Over 100,000 cycles


• Key Code Combinations: Over 2,700,000


• Operating Temperature: -20°C to +80°C


• Fire Door Compatibility: Approved for fire-rated and smoke-control doors

Applications

Used in residential and commercial buildings requiring enhanced door security, including apartment blocks, offices, shops, and public facilities. Compatible with fire protection doors, smoke-control doors, and projects with strict security requirements. Suitable for bulk installation in new developments, refurbishment of access points, and for regulated environments where national or EU safety certifications are required.

Packaging & Shipping

Each unit is supplied in a sealed, tamper-proof box with 5 drilled keys, coding card, fixing screw, and installation accessories. Packaging ensures product integrity and is suitable for secure bulk shipping.