How do you choose the right security cylinder for each type of door?
Last updated: 2 March 2026
Choosing a security cylinder is often the most crucial decision we make to protect our home or business. Although hidden beneath an elegant exterior, the cylinder is the heart of the lock – the first and last line of defence against any attempted break-in. However, in a market saturated with options, knowing how to choose the right model for each type of door and level of risk can be a real challenge.
At TESA ASSA ABLOY, we have spent decades perfecting this key component of security. We understand that the door to a detached house does not present the same challenges as the entrance to an office building, which is why choosing a lock cylinder should not be left to chance, but rather based on strategic analysis and technical expertise.
The Silent Vulnerability: Why the Choice Is Critical
Historically, many homes and businesses have relied on standard locks, designed more for functionality than for strength. This reliance is shattered the moment a burglar uses simple, quick methods of attack, such as bumping, picking or drilling. The lock, which should be impenetrable, becomes the most vulnerable part of the door.
The key to thwarting these techniques lies in the physical and technological strength of the cylinder. When faced with an attempted break-in, the quality and certifications of the cylinder make all the difference between a door that is opened in seconds and one that holds out long enough to deter the intruder. At TESA ASSA ABLOY, we are committed to designing cylinders that thwart these techniques, safeguarding what matters most.
The Architecture of Resistance: Essential Functions of a Good Cylinder
When choosing a security cylinder, we don’t just look at the metal; we assess a design built to withstand attack. At TESA ASSA ABLOY, we have incorporated multiple layers of protection that are specifically designed to counter the most common burglary techniques.
Protection against bumping is essential, as it is a silent technique that uses a specially modified key. Our high-security cylinders, such as the TK100 model, incorporate internal components specifically designed to thwart this attack, rendering the bumping key ineffective.
Equally important is resistance to breaking and extraction. Many intruders force or extract the cylinder to render the lock inoperable. Our security cylinders are manufactured from high-density materials and often feature steel reinforcement bars or modular designs that break at controlled points to protect the internal mechanism.
Finally, protection against drill attacks is achieved by incorporating pins and cores made from extremely hard materials, such as carbide, which wear down the attacker’s drill bits, thereby thwarting destructive intrusion. These components are featured in solutions such as the TK100 from TESA ASSA ABLOY.
A Level of Security for Every Need: The Environment Matters
The crucial question is not just how secure a lock cylinder is, but how secure it needs to be for its specific environment. A main entrance door with direct exposure to the street does not require the same level of protection as an internal office door.
For environments requiring maximum security, such as isolated homes, shops with valuable stock or main entrance doors in residential complexes, we recommend cylinders with high-level European certifications (such as the EN 1303 standard). These cylinders are designed to withstand multiple simultaneous attacks.
For secondary or interior doors that require robust access control but not the highest level of resistance to forced entry, there are cylinders with advanced key control features, taking us to the next level of security.
Key Management: Logical and Physical Security
Beyond physical resistance, a lock cylinder’s security also depends on control over the duplication of its keys. A lock cylinder that allows keys to be copied freely at any hardware store loses much of its security value.
At TESA ASSA ABLOY, we use proprietary and controlled key systems, such as the TK100 and TX80 cylinders, to prevent unauthorised duplication. Keys can only be duplicated upon presentation of the ownership card and through our official channels, ensuring maximum protection against fraudulent duplication.
How We Manage Key Copies
At TESA ASSA ABLOY, we operate two distinct policies to ensure maximum protection:
- Factory Cut Systems: copies are made exclusively in-house, allowing us to monitor every duplicate from the outset. We use this system for our TK100, TX80 and T70 cylinders, amongst others. In addition, we use the Keymanager digital tool, which helps us to manage and record all copies easily, keeping track of who requests them and when they are made.
- Systems with Controlled Distribution: in this case, keys can only be duplicated at authorised dealers, ensuring that every duplicate key is genuine and properly registered. This system is featured in models such as the ST6, TX7P and ST8.
In this way, we ensure that every customer retains complete control over their keys and can choose the option that best suits their home, business or building.
Adapting to the Environment: Large-Scale Projects with TESA ASSA ABLOY
The need for a cylinder system that combines maximum physical strength with highly complex master keying becomes evident in large-scale infrastructure projects. TESA ASSA ABLOY has a proven track record in installing millions of master-keyed cylinders in critical projects around the world, demonstrating an unrivalled ability to manage thousands of access points using hierarchical systems offering the highest level of security.
An example of this scale can be seen in institutional and corporate buildings where thousands of users (maintenance staff, security personnel, managers) gain access to specific areas using the minimum number of keys, thanks to solutions based on high-security cylinders such as the TK100 and the TX80, as well as other models used in master key systems such as the TK6, the TD60 and the TD5.
This combination provides physical security against unauthorised access, strict control over key duplication and optimised operational management, making it suitable for medium- and large-scale projects.
Your peace of mind starts with the lock
A Connected Future: Beyond Metal
The future of the security cylinder is not limited solely to the strength of the metal. The evolution lies in connectivity and intelligence, integrating solutions that expand the possibilities of access control. In this regard, at TESA ASSA ABLOY we develop technologies such as eCLIQ and SMARTair, which allow us to combine the mechanical robustness of our high-end cylinders with the flexibility of electronic and intelligent access control, creating hybrid systems that offer the best of both worlds.
At TESA, we continue to innovate so that our cylinders are not only robust, but also form part of a comprehensive security ecosystem capable of adapting to the security challenges posed by both the digital and physical worlds. Choosing the right cylinder is the first major step towards uncompromising security.
FAQs
The future of security is already on your doorstep
Every building, every door and every environment requires a specific level of security. At TESA ASSA ABLOY, we help you identify the most effective cylinder and master key system for your premises.
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