Choosing the correct euro cylinder size is just as important as choosing a high-security lock. Even the best anti-snap cylinder can be less effective if it has been fitted incorrectly or is the wrong length for the door.

One of the most common installation mistakes is allowing the cylinder to protrude too far beyond the door handle. While the lock may still operate normally, excessive projection creates an exposed gripping point that can make the cylinder more vulnerable to lock snapping and other forms of forced entry.

Why Cylinder Projection Is Important

The euro cylinder should fit the door and handle combination correctly, with as little projection as possible beyond the external handle.

If the cylinder extends noticeably past the handle backplate, it becomes easier for an intruder to grip the exposed section using specialist tools. This can significantly reduce the effectiveness of the lock, particularly if it is an older standard cylinder.

As a general guide, the external face of the cylinder should sit flush with the handle or protrude by no more than 3mm. Anything beyond this may increase the risk of attack and should be assessed. Internal projection is less critical, but the cylinder should still be correctly sized for smooth operation.

A High-Security Lock Still Needs Correct Installation

Many homeowners concentrate on buying a recognised lock brand but overlook the importance of correct fitting.

Even a 3 Star anti-snap euro cylinder can offer reduced protection if it is too long for the door. Correct sizing allows the security features built into the cylinder to perform as intended and removes unnecessary exposed areas that could be exploited.

The right installation combines:

• The correct cylinder length.
• Minimal external projection.
• A secure, correctly fitted handle.
• Smooth operation without binding.
• Proper door alignment.

All of these factors work together to maximise the security of your door.

Signs Your Euro Cylinder May Be the Wrong Size

You should consider checking your lock if:

• The cylinder sticks out well beyond the external handle.
• The lock was replaced without measuring the original correctly.
• New handles have been fitted that are thicker or thinner than the originals.
• The door has been upgraded but the existing cylinder was reused.
• You are unsure whether the lock was fitted correctly.

A simple measurement can determine whether the cylinder is the correct size for your door.

Improve Security with the Right Cylinder

If your existing cylinder projects too far, replacing it with the correct size is often a quick and inexpensive security upgrade. It's also an ideal opportunity to install a 3 Star anti-snap euro cylinder, providing increased protection against lock snapping, lock picking, drilling and bumping.

Combined with a quality TS007 security handle and a properly adjusted multi-point locking system, a correctly sized cylinder forms an important part of your home's overall security.

Don't Overlook Correct Lock Sizing

The quality of a euro cylinder is only part of the equation. Correct sizing and professional installation are equally important in ensuring your door provides the level of protection it was designed to deliver.

Checking how far your cylinder projects beyond the handle is a simple but worthwhile inspection that can identify an unnecessary security risk. If the cylinder protrudes excessively, replacing it with the correct size can improve security, reduce vulnerability to forced entry and ensure your locking system performs at its best.