About European Standard EN 1303:2005

The security of any door application is a combination of many factors, including door construction and the physical environment surrounding the door. However, the cylinder is probably the most vulnerable element in the assembly and is therefore subject to severe requirements of resistance to physical attack and other aspects of security such as key control.

EN 1303 is the European Standard which establishes assessment and test criteria for each cylinder to quantify its resistance to physical attack, durability and key security.

EN 1303 classifies cylinders for locks using an 8 digit coding system. Features include durability, fire resistance, key related security, and attack resistance. The resulting 8 digit code can be used to directly compare the performance of one cylinder range against another.