ASSA ABLOY One System Main Lock 72/55/20/235 EN 12209 Fire Rated Anti-Manipulation

Product Overview

The Assa Abloy One System main lock 72/55/20/235 is engineered for fire-rated doors and meets EN 12209 requirements for security and durability. Typically installed in commercial and institutional buildings, it features a 9x9 mm spindle hole for compatibility with standard lever handles. The stainless steel lock faceplate resists corrosion, while mounting holes incorporate special notches designed to prevent screw loosening under heavy use.

A key differentiator is its anti-manipulation latch design, which increases door security by resisting forced entry or tampering?a critical factor for procurement in applications requiring fire and access control compliance. This SKU is particularly suited for facility managers and OEM buyers specifying high-cycle locks in environments such as offices, hotels, healthcare, and public buildings.

Key Features

• EN 12209 certified ? compliance with European fire and security standards for hardware


• Cycle-tested to 1,000,000 operations ? supports extended life in high-traffic doors


• Stainless steel faceplate ? corrosion-resistant for long-term reliability and clean appearance


• Anti-manipulation latch ? enhances resistance to forced entry and lock tampering


• Universal handing ? can be installed on left- or right-handed doors without modification


• Special notched mounting holes ? prevents screw loosening from vibration or frequent use


• 9x9 mm spindle hole ? compatible with standard lever handles for seamless integration

Technical Specifications

• Backset: 55 mm


• Spindle Hole: 9x9 mm


• Lock Case Size: 72/55/20/235 mm


• Faceplate Material: Stainless Steel


• Certification: EN 12209


• Test Cycles: 1,000,000


• Handing: Universal (left/right)

Applications

Designed for fire-rated internal and external doors in office buildings, hotels, hospitals, and public institutions. Compatible with specification projects requiring EN 12209 certified locks and high-cycle durability. Suited to OEM, bulk installation, and environments where resistance to tampering and forced entry is essential.

Packaging & Shipping

Standard export packaging. Each lock unit includes mounting screws, installation instructions, and certification documentation.