How to Replace a Euro Lock Cylinder

The Euro lock cylinder is a tried and tested security solution for UK homes. There are many different lock barrel types to choose from catering for all kinds of protection needs. There are anti-pick, anti-drill and anti-bump locks to name just a few. It is worth checking that your cylinder is designed to a British Standard to ensure maximum reliability and safety. 

Essentially, there are two plugs at each end of the cylinder that connect to a central cam component via springs. The key fits into both plugs and when the cylinder is inserted, the shear line is aligned with both pins and a shear bolt is activated, locking or unlocking the door. It is possible to cut a Euro cylinder lock using a saw or a hacksaw but it is not recommended as this could damage the cam. Using a hacksaw or saw would also damage the handle backplate and the internal mechanism of the cylinder which could leave it vulnerable to attack.

To replace a Euro Cylinder, simply find the screw on one of the faces of the cylinder, usually found on the faceplate over the door handle or on the faceplate of the lock itself. Unscrew this to release the cylinder. It is important to note that if you are replacing a thumb turn euro cylinder, then you must remove the thumb turn before doing this.

Once the cylinder has been removed, it is vital to take measurements from the centre of the fixing screw (dimension A) and each end of the cylinder. This will enable you to purchase a replacement cylinder of the correct size. It is also worth noting that the size of the cylinder should be stated clearly on the packaging. They can be bought in different sizes including half, single and double cylinders. The cylinders can be fitted with keyhole covers to prevent unauthorised access and the keys can also be laser etched to help identify who is a legitimate user of the door and for added security.

Some cylinders are now available with anti-snap technology that protect against attacks such as the "blowtorch technique" which involves melting the door frame around the lock to expose the inner cylinder. The new cylinders are designed with a thin sacrificial snap line so that the cylinder will snap at this weak point whilst leaving the cam intact and this can be very difficult to replicate by criminals. The cylinders can also be supplied in a variety of finishes to suit the décor of any home or office.