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How to measure a window lock

Espag window locks are relatively easy to identify and install. The instructions below should help you through
the process of measuring your current lock to establish the direct replacement that you require.

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STEP 1

Note the position of the lockcase relative to the faceplate

In the first instance you should note the position the lockcase relative to the faceplate - inline or offset.

The top example shows an offset lockcase - it is positioned on one side of the faceplate.
An inline lockcase (as per the image on the bottom) sits centrally on the faceplate.

STEP 2

Identify the rail shape

Looking at the rail end-on, identify the rail shape (see Fig. 1).
The top image is a flat rail; the bottom image shows a u rail.

STEP 3

Take the measurements

The next step is to take a series of measurements:
A: Backset The distance from the middle of the spindle to the front face of the lock.
B: Faceplate length The distance from the top to bottom of the faceplate which sits flush on the window.
C: Faceplate width Horizontal width of the faceplate that sits flush to the window.
D: Cam height The height of the mushroom (or roller) cams at each end of the rail.
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