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How do I measure a door cylinder?

The size of cylinder you need is determined by the thickness of the door and handle combination, for this reason there are many sizes available and you will need to be careful that you measure the cylinder accurately (one size will not fit all). It is possible to measure a door cylinder in the door, but to be sure it's best to remove it first.

  • Your new door cylinder should protrude by no more than 5mm from the handle back plates.

  • Measurement A - Measure from one end of the cylinder to the middle of the central screw hole.

  • Measurement B - Measure from the other end to the middle of the central screw hole.

Now check your measurements

Measure the overall cylinder length from end to end. The length of the cylinder should equal the sum of measurements (A) and (B) when added together.

For example: If measurement (A) = 45mm and measurement (B) = 50mm the size required would be 45/50 cylinder (95mm in length). No further measurements are required

Please note: These cylinders can be reversed when fitting therefore ordering a 45/50 cylinder is the same as ordering a 50/45 cylinder.

There are two ways to measure the size of the  euro cylinder. Either in the door or remove the cylinder from the door.
When lock barrel is out of the doorWhen lock barrel is still in the door

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Still need help with Measurements?

Check out this video