How To Measure UPVC Door Lock?

Tools Needed for Measuring UPVC Door Locks

To accurately measure UPVC door locks, you will need the following tools:

• Tape measure
• Ruler
• Callipers (optional but useful for precise measurements)
• Pen and paper (for recording measurements) 

Step 1: Measure the Backset

What is Backset? The backset is the distance from the edge of the door to the centre of the keyhole (or the cylinder). It’s a crucial measurement for ensuring your lock aligns properly with the door mechanism.

Instructions:
Open the door to expose the edge where the lock is installed.
Place the tape measure at the edge of the door.
Measure the distance to the centre of the keyhole (or the spindle hole if the keyhole is not centred).
Record the measurement.

Step 2: Measure the PZ (Centre Measurement)
What is PZ Measurement? The PZ measurement, also known as the centre measurement, is the distance between the centre of the spindle (handle) and the centre of the keyhole.

Instructions:
Identify the spindle and keyhole on the lock.
Use the ruler or tape measure to measure the distance between the centre of the spindle and the centre of the keyhole.
Record this measurement.

Step 3: Measure the Overall Length of the Lock

Instructions:
Measure from the top edge of the lock case to the bottom edge.
If the lock has an external cylinder, measure from one end of the cylinder to the other.
Ensure you measure accurately from the extreme edges to get the correct length.
Record the overall length.

Step 4: Measure the Lock Case and Faceplate

What are the Lock Case and Faceplate?
Lock Case: The part of the lock that is installed within the door.
Faceplate: The visible part of the lock on the edge of the door where the latch or deadbolt protrudes.
Instructions:

Lock Case:
Measure the height, width, and depth of the lock case.
Record these measurements carefully.

Faceplate:
Measure the height and width of the faceplate.
Note any specific features such as rounded or square ends.

Common Mistakes to Avoid

When measuring UPVC door locks, common mistakes can lead to improper fit and functionality issues. Here are some mistakes to avoid:

Incorrect Backset Measurement: Ensure you measure from the correct point (edge of the door to the centre of the keyhole).

Ignoring PZ Measurement: This is crucial for the alignment of the handle and keyhole.

Not Measuring All Components: Make sure to measure the lock case, faceplate, and overall length.

Rounding Off Measurements: Always record precise measurements to ensure a proper fit.

Accurately measuring your UPVC door lock is essential for ensuring a proper fit and maintaining the security and functionality of your door. By following these steps and using the right tools, you can confidently measure your door lock and choose the correct replacement or upgrade. Always double check your measurements and consult professional help if needed to avoid common mistakes.