What makes a lock cylinder truly secure?
Last updated: 22 April 2026
When we talk about door security, we often think of the lock, the key or even the door itself. But there is one crucial component that often goes unnoticed: the lock cylinder.
At TESA ASSA ABLOY, we know that this is where a crucial part of effective security comes into play. The cylinder is not just the part into which the key is inserted: it is the heart of the locking system and the first line of defence against attempts at tampering, extraction, breaking or unauthorised duplication.
That is why, when we talk about a truly secure cylinder, we do not focus on a single feature. We consider a range of factors that must all work together: certification, protection against lock-picking techniques, physical resistance, key-copying control, adaptability to different locking systems, and durability. This is the approach we take when developing our solutions at TESA ASSA ABLOY.
When manipulation fails, force takes over
In addition to techniques such as bumping or lock picking, a cylinder can also be subjected to attacks such as extraction, breaking, twisting or drilling. In the face of such attacks, it is not enough for it to function properly under normal conditions: it must be able to continue providing protection precisely when someone attempts to force it open.
At TESA ASSA ABLOY, we approach security with this requirement in mind. That is why we have developed a wide range of solutions designed to withstand real-world attacks and provide reliable protection even when the cylinder is subjected to a direct break-in attempt.
Good security should also be long-lasting
True security isn't just measured at the time of installation. It's also measured over time.
A high-quality lock cylinder must maintain its performance and level of security after thousands of opening and closing cycles. That is why durability and resistance to repeated use are key factors when assessing its reliability. At TESA, we work with solutions developed to meet the demands of intensive use, with cylinders capable of withstanding between 100,000 and 200,000 cycles, depending on the model and the application for which they are designed.
This is important because security should not be seen as a one-off measure, but rather as a form of protection that must be maintained in everyday life, whether at home, in the community or in a commercial building.
Choose wisely to protect better
Choosing a lock cylinder should not simply be a matter of selecting a component that opens and closes a door. It is a decision that directly affects the level of security, access control and the long-term reliability of the system.
At TESA ASSA ABLOY, we develop solutions designed to meet a wide range of needs, from residential properties to communal spaces and commercial projects. And as not all installations have the same requirements, we also place great importance on providing expert advice.
To this end, we have a network of distributors in whom we have complete confidence, ready to assess each individual case and help find the option that best suits each customer’s needs. Using our distributor map, any customer can easily locate their nearest outlet and receive support from a specialist.
Because a truly secure lock cylinder isn’t just one that locks a door. It’s one that meets the specific requirements of each installation, enables access control and continues to provide protection over time.