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Pair with Compatible Cylinder Hardware
Euro Cylinder Accessories & Matching Hardware
To ensure a proper fit and maximum security, we recommend pairing your Euro Cylinder Keyed Both Sides with suitable accessories:
🔒 Euro Profile Locks – These are designed to work seamlessly with euro cylinders and are suitable for timber, uPVC, and composite doors. Choose from a wide range of sizes and finishes to suit your project.
🚪 Euro Backplate Handles – Ideal for doors fitted with euro mortice locks. Available in popular centres such as 92mm and 72mm to suit modern and traditional handle sets.
🧩 Multipoint Locking Handles – For use on composite or uPVC doors with multipoint locking systems. These handles are often used with front and back doors for extra security and weather sealing.
🛡️ Cylinder Pulls & Escutcheons – Designed to enhance both security and appearance. These protect the euro cylinder from snapping attacks and add a sleek finish to your door.
If you're unsure about the size, finish, or type of accessory needed, don’t hesitate to contact our team. We’re here to help with expert guidance and recommendations.
Sizing & Security Recommendations
📏 How to Measure a Euro Double Cylinder
Getting the correct size euro cylinder is essential for both security and a professional-looking installation. A poorly sized cylinder can leave your door vulnerable to snapping attacks or create an untidy finish.
Here's how to measure a euro cylinder:
- Remove the old cylinder – Unscrew the central fixing screw located on the edge of the door and slide the cylinder out using the key.
- Measure from thr fixing hole to each end – You’ll get two measurements (e.g. 35mm from the centre to one side and 45mm to the other), written as 35/45 or 45/45 etc.
- Match your measurements to your door handware – The cylinder should sit flush with your handles or escutcheons. Any overhang of more than 5mm could be a security risk.
Most popular euro double cylinder sizes include:
- 30/30mm – Often used for narrow doors or outbuildings
- 35/35mm – Common in timber doors with standard backplates
- 35/45mm – Used when one side of the door is thicker or has a different escutcheon style
- 40/50mm – For doors with offset handles or deeper backsets
To improve cylinder protection and avoid overhang, we recommend pairing your cylinder with one of our Cylinder Pulls & Escutcheons. These help to cover exposed metal and improve resistance to snapping.
For help choosing the right size, speak to our experts via the contact page — we’re happy to assist with measuring guides, product pairing, and security advice.
Frequently Asked Questions
What is a Euro Cylinder Keyed Both Sides?
What is a Euro Cylinder Keyed Both Sides?
A Euro Cylinder Keyed Both Sides, also known as a double euro cylinder, is a type of door lock barrel that allows a key to be inserted and used from both sides of the door. It’s widely used in domestic properties and provides balanced access and locking functionality on either side.
Are Euro Double Cylinders safe for residential use?
Are Euro Double Cylinders safe for residential use?
Yes, when fitted correctly and paired with TS007 3-star security features or a reinforced escutcheon. However, they are not recommended in HMOs, commercial properties, or fire-regulated buildings, as they can prevent keyless exit during an emergency.
What’s the difference between a double cylinder and a cylinder with thumbturn?
What’s the difference between a double cylinder and a cylinder with thumbturn?
A double cylinder requires a key on both sides of the door, whereas a cylinder with thumbturn allows for keyless locking/unlocking from the inside using a turn knob. Thumbturns are usually preferred in new builds or multi-occupancy homes to meet fire safety regulations.
How do I know what size euro cylinder I need?
How do I know what size euro cylinder I need?
Measure from the centre fixing hole of your current lock to each end — for example, 35/35mm. You can find popular options like 30/30, 35/35, 35/45, and 40/50 in our Euro Cylinder Keyed Both Sides range. If you need help measuring, contact us for expert guidance.
Fire Regulations & Use Cases
🔥 Where Euro Double Cylinders Should and Shouldn’t Be Used
Euro Cylinder Keyed Both Sides (also known as Double Euro Cylinders) are a popular choice for residential doors, but they’re not suitable for every situation — especially where fire safety or emergency egress is a concern.
Best suited for:
- Domestic front and back doors
- Garden buildings, sheds, and garages
- Timber, uPVC, and composite door systems with euro profile locks
- Properties with no fire regulation requirements
In these environments, a double cylinder allows you to lock and unlock the door with a key from either side, offering consistent access control and security. For added protection, consider a TS007-rated version, or pair with one of our Euro Backplate Handles or Multipoint Locking Handles depending on the door style.
Avoid using double cylinders in:
- HMOs (Houses in Multiple Occupation)
- New build homes and flats (due to Part B fire regulations)
- Commercial properties and offices with shared access
- Any location where emergency keyless exit is legally required
In these settings, a double cylinder can pose a fire escape risk. If a key is not present on the inside, it can prevent rapid evacuation during an emergency.
Instead, regulations and best practices typically recommend a Euro Cylinder with Thumbturn. These allow keyless internal exit via a turn knob while maintaining secure locking from the outside with a key — making them compliant for fire safety and easier for elderly or vulnerable users to operate.
If you're unsure whether a keyed both sides or thumbturn cylinder is right for your application, contact our team for expert help tailored to your building type, regulations, and door design.