You measure thumbturn Euro cylinder locks by determining the distance from each end of the cylinder barrel to the center of the fixing screw hole.
Here's a breakdown of how to measure:
- Identify the Type: The question refers to a "thumbturn Euro cylinder." This means the lock cylinder has a keyhole on one side and a thumb-operated turn on the other.
- Locate Measurement Points:
- Barrel End: Measure from the very end of the metal cylinder barrel (on both sides).
- Screw Hole Center: Find the center of the fixing screw hole on the side of the cylinder. This is the hole that a screw goes through to secure the cylinder in the door.
- Take the Measurements:
- Measure the distance from one barrel end to the center of the screw hole.
- Measure the distance from the other barrel end to the center of the screw hole.
- These two measurements are usually different and are both required when ordering a replacement cylinder.
- Important Considerations:
- Do Not Include the Thumbturn: The measurement only includes the cylinder barrel itself. The thumbturn mechanism is not part of the measurement.
- Do Not Include the Cam: Do not measure to the end of the black cam ring. Measure only to the barrel end.
- Example: If one side measures 35mm and the other measures 45mm, you would order a 35/45 Euro cylinder.
In summary, accurate measurement is crucial when replacing a thumbturn Euro cylinder lock. Measure from each end of the cylinder barrel to the center of the fixing screw hole, excluding the thumbturn and the cam ring.
