How do I measure a cylinder?
Why is measuring a cylinder lock important?
A cylinder lock that does not have the correct size can cause various issues. For example, if the lock sticks out too far from the door, it creates a weak point that burglars can exploit. On the other hand, a cylinder that is recessed too deeply into the door can be difficult to reach with a key, making it harder to use. In addition, accurate measurement contributes to a neat and aesthetically pleasing door finish.
How to measure a cylinder lock
The standard length of a cylinder lock is, as mentioned, 60 mm, since most doors are 40 mm thick. However, in new construction and in Germany, thicker doors are increasingly common, making a 60 mm cylinder insufficient. Measuring a cylinder lock is not difficult: the lock is measured from the center of the profile cylinder – at the same point where the fixing screw is located that secures the lock in the door.
How to measure a cylinder lock
The best method to measure a cylinder lock is to remove it from the door and then measure it. This is very easy: you simply unscrew the long fixing screw on the edge of the door, and by turning the key slightly to the left or right, you can pull the cylinder lock out of the door.
From the screw hole in the center of the profile cylinder, measure the distance to the left and to the right (for example, 30 mm on one side and 35 mm on the other). The standard length of a cylinder lock is 60 millimeters, which means 30 mm on each side.
Cylinder locks can be extended in 5 mm increments on either side, so there is a suitable cylinder for every door! If doors are thicker than 40 mm, the cylinder length is often no longer equal on both sides. That’s why lengths like 30–45 mm are also common for profile cylinders.
