Home ImprovementDiscover Cylinder Locks: What Are They, Different Types and More
You may also like:
When it comes to securing residential properties, you’ll find cylinder locks in countless modern homes, schools, hospitals, and businesses. They’re very versatile and easy to install since you don’t have to remove any other fittings on the door. But to install or replace one yourself, you first need to know the proper measurements.
In this blog post, you’ll become familiar with the essential tools, and all the other information on how to measure cylinder locks for your lock replacement or upgrade. So, say goodbye to guesswork and hello to precision!
Cylinder locks, including euro cylinder and oval cylinder locks, are a combination of a keyhole and a tumbler mechanism contained within a cylinder, hence the name. Like any other lock, these work by using a key to align pins inside the lock mechanism, allowing the lock to turn and either secure or release the door.
As far as specifics regarding measuring, two things are important to you:
No. Cylinder locks come in various sizes to accommodate different types of doors and door frames. The standard sizing of a cylinder lock involves measuring the cylinder from the centre of the screw hole to each end. The measurements are always done in millimetres.
Cylinder locks are typically specified with two measurements separated by a forward slash, such as “30/30” or “40/40.” These measurements represent the total length of the Euro cylinder lock. For example, a “30/30” Euro cylinder lock has a total length of 60 millimetres, with 30 millimetres on one side (interior or exterior) and 30 millimetres on the other side.
Getting the right size for your cylinder lock is of utmost importance. If it’s too long, it can compromise your security because it will literally tick out of the mortice. The maximum length at which it can stick out and not pose a security risk is 5mm. Any longer than that and it will be easy to be broken via lock snapping. On the other hand, if the lock is too short, you’ll face difficulties in turning the key effectively.
Usually, you don’t need to measure the height or width of the lock. “Euro profile” is the industry standard, and all doors meant for such locks will have a mortice with the same diameter and height. It’s the length of the lock that matters in most cases unless you have a lock that’s very different in size compared to the majority. With all said so far, this is what you need…
Examine the lock on your door visually. Pay attention to the shape and features of the keyway and the lock itself.
Now, it is quite possible to measure the door cylinder while it’s still in the door, however, it will be much easier and you will have more certainty when it’s out of the lock.
Use the appropriate screwdriver to loosen and then fully remove the retaining screw. With the screw removed, insert the key into the cylinder lock and turn it until the cam (the part that protrudes from the lock) goes back into the lock.
Once the cam is retracted, you can now carefully slide or pull the cylinder lockout of the door. If it’s a tight fit, you might need to use pliers to grip and gently wiggle the lock free.
Be cautious not to force it, as this can damage the lock or the door.
The measurement for all types of cylinder locks should typically be taken from the centre of the screw hole to the outer edge of the cylinder on both sides. This method ensures that you get the total length of the cylinder.
This also means that the measurement process is generally the same for euro cylinder locks, oval cylinder locks, thumbturn/single or double cylinder locks, and other cylinder lock types.
When you have a thumbturn lock, do not measure the thumbturn, only to the barrel end.
For Euro cylinder locks and thumbturn/single cylinder locks, measure the diameter of the cylinder, which is often referred to as the thickness. You can use a calliper or measuring tape to obtain this measurement, if necessary.
The cam is the protruding part of the cylinder that interacts with the locking mechanism. You will hardly need to measure this, but it’s still good to know just in case.
These measurements are essential to ensure that your new lock will fit correctly. Be precise and double-check your measurements, as small errors can lead to installation problems or security vulnerabilities.
Selecting the correct size cylinder lock is crucial, whether you’re replacing an existing lock or getting a brand new one. So, if you are wondering “How do I know what size cylinder lock I need?”, here are some pointers to help you make the right choice.
Take advantage of professional lock replacement and installation for maximum security.