Window won't lock, or the handle spins? On an offset espag window lock the handle spindle is set back from the faceplate, so the handle sits further in from the edge of the window. This page covers offset espags with a flat faceplate, from Maco, Versa and a JCP 13mm slimtrack lock.
Check the backset, faceplate width and length of your old lock. If the faceplate is a U-shaped channel, see offset U-rail espags.
From the face of the faceplate to the centre of the spindle hole. 20mm and 22mm are common on uPVC windows.
Flat strip, not a U-channel. Measure its width (for example 13mm) and overall length.
Count the cams and note their positions so they line up with the keeps.
Look for a name or part number on the faceplate, such as Maco or Versa.
Open the window fully and remove the handle. Undo the screws along the faceplate on the edge of the sash and ease the old lock out of its groove. Fit the new lock in the same position, refit the screws and handle, and check it locks smoothly with the window open before you close it.
If the square hole for the handle spindle is set back from the faceplate rather than in its centre, it is offset.
Look at the strip on the sash edge. A flat strip needs a flat faceplate lock; a U-shaped channel needs a U-rail lock.
Browse all uPVC window locks: inline espag, offset flat faceplate, offset U-rail, shootbolt and window keeps.
Not sure which window lock you have? Send us a photo of the faceplate and gearbox with a tape measure in shot, and we'll match it for you.
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