Measuring A Door Cylinder
The size of cylinder is determined by the thickness of the door and handle combination, therefore there are many sizes available and you will need to be sure that you measure the cylinder accurately (one size will not fit all). It is possible to measure a door cylinder in the door, but it's best to remove it first and measure it.
Your new door cylinder should protrude by no more than 5mm from the handle back plates. It is ideal to go for exactly the same size as you are replacing.
Measurement B - Measure from one end of the cylinder to the middle of the central screw hole.
Measurement C - Measure from the other end to the middle of the central screw hole.
The door cylinder should protrude between 2mm and 5mm from the handle back plates.
Measure the overall cylinder length from end to end. The length of the cylinder (A) should equal the sum of measurements (B) and (C) when added together.
For example: If measurement (B) = 45mm and measurement (C) = 50mm the size required would be 45/50 cylinder (95mm in length (A) ).
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