How to Measure and Swap a Door Cylinder Lock

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If you are looking at improving your home security and thinking of upgrading your door locks to something more secure, we have an easy guide on how to remove and measure your lock.

Steps To Measure A Lock

Measuring a door cylinder lock is essential for ensuring a proper fit when replacing your lock. Here’s how to do it accurately:

Tools Needed

  • Philips Screwdriver
  • Tape measure or ruler

To remove the existing lock

  1. Ensure the door is open and unlocked.
  2. Locate the screw on the side of the door that secures the lock cylinder.
  3. Using a screwdriver, remove this screw.

To measure the cylinder length

  1. Insert the key into the lock and turn it slightly (usually to 10 o’clock or 2 o’clock) to align the cam, making it easier to remove the cylinder.
  2. Gently pull the cylinder out of the door.
  3. Using a tape measure or ruler, measure from the centre of the screw hole to each end of the cylinder. Note two measurements: the internal side and the external side.

Example Measurement

If your measurements are 45mm (internal) and 55mm (external), your cylinder length is 100mm. Ensure you get a replacement cylinder with these same dimensions. If you lock protrudes on the internal or external side, you could reduce these accordingly. Ideally you want them flush or 5mm proud of the handle.

Choosing the Best Lock for Your Door

Once you have measured your door cylinder lock, the next step is to choose the best lock for your needs. For a detailed comparison of top-rated locks like Avocet ABS, Ultion Plus, and Yale Platinum, visit our comprehensive guide. This post covers certifications, designs, features, and size ranges to help you make an informed decision on enhancing your home security.

Read more about the best locks to choose: Best Door Lock: Ultion vs Avocet vs Yale

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