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Technical Help - Email your pictures to info@northwesthardware.co.uk & then call us

How to measure a door lock

How to identify a door lock

How to measure the backset:
of a door lock
of a cockspur handle

How to measure the PZ:
of a door lock
of a door handle

How to measure a cylinder

How to measure a thumbturn cylinder

How to measure a drive gear

How to measure an espag rod

How to identify the hand:
of a door handle
of a window handle

Changing the hand of a split spindle


How to measure a door lock:

How to measure a door lock

1
Backset
2
PZ
3
Outer mechanism to outer mechanism
4
Overall length


How to identify a door lock:

What make is the lock? Is there a logo on it?

Is there a code or any markings on the strip?

What mechanisms are on the lock:

How to identify a door lock

How many of each mechanism are there?

Email a picture of the lock, showing any mechanisms and/or logos to info@northwesthardware.co.uk


How to measure the backset of a door lock:

This is the measurement from the faceplate to the centre of the spindle.


How to measure the backset of a cockspur handle:

To determine the backset of a cockspur handle, you need to measure from your window frame, to the underside of the arm.


How to measure the PZ of a door lock:

This is the measurement from the centre of the cylinder to the centre of the spindle.


How to measure the PZ of a door handle:

This is the measurement from the centre of the cylinder to the centre of the spindle.


How to measure a cylinder:

Measurement from one side to the centre, and then from the other side to the centre, e.g. 30/40.


How to measure a thumbturn cylinder:

Always give the measurement of the thumbturn side first. Measurement from the thumbturn side to the centre, and then from the other side to the centre, e.g. 40/40.


How to measure a drive gear:

Internal Only

As well as the measurements below, please take note of any names and markings on the strip, and whether it has any rollers or mushrooms.

1
Overall Length
2
Width
3
front of faceplate to centre of spindle

Internal / External

As well as the measurements below, please take note of any names and markings on the strip, and whether it has any rollers or mushrooms.

1
Overall length
2
Width
3
Backset - front of faceplate to centre of spindle
4
PZ - he measurement from the centre of the cylinder to the centre of the spindle


How to measure an espag rod:

1
Overall Length
2
Width
3
Backset front of faceplate to centre of spindle
4
Inline or Offset Inline is when the gearbox is in the centre of the rail. Offset is when the gearbox is set to one side of the rail.

Alternatively, you could buy our 'Espag in a Bag' retrofit espag rod, which replaces inline & offset espag rods, ranging from 400mm 1000mm & is available in a 21mm & 25mm backset.


How to identify the hand of a door handle:

The hand of a door handle is determined by the direction in which the handle points.

This is a right handed door handle: -


How to identify the hand of a window handle:

The hand of a window handle is determined by the direction in which the handle points when turned.

This is a left handed window handle: -


Changing the hand of a split spindle


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