A gold-colored metal window lock mechanism with an offset espag, positioned against a plain background.
Technical drawing of a metal strip with two mounting holes spaced 43mm apart, showing dimensions including 8mm thickness, 16mm width, and a customizable length and backset (20mm or 25mm).
Diagram showing two types of UPVC window gearboxes: Offset Gearbox on the left and Inline Gearbox on the right, with red window profiles and labeled parts for comparison.
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A gold-colored metal window lock mechanism with an offset espag, positioned against a plain background.Technical drawing of a metal strip with two mounting holes spaced 43mm apart, showing dimensions including 8mm thickness, 16mm width, and a customizable length and backset (20mm or 25mm).Diagram showing two types of UPVC window gearboxes: Offset Gearbox on the left and Inline Gearbox on the right, with red window profiles and labeled parts for comparison.

UPVC Window Lock - Offset Espag - 600mm – Replacement uPVC Window Part

AvocetSKU: HS2664
Price:
£7.99

Key benefits

  • Offse espag mechanism - fits older offset-pattern windows
  • 250mm to 800mm lengthst - match your window height
  • Direct replacement - fits most older uPVC windows

100% SECURE PAYMENTS

HASSLE FREE RETURNS

FULLY TRACKED DELIVERY

Description

This is the mechanism inside the window frame that is operated by the handle

Gearbox is positioned over to one side on the rail (offset)

Important Measurements

1) Overall length

2) The 'Backset' (20mm, 25mm)

4) Rail Width (Usually 16mm)

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Frequently Asked Questions

A 600mm offset espag window lock is a multipoint locking mechanism used in uPVC windows with an offset handle spindle design. It secures the window by engaging locking points along the frame for improved safety and sealing.

The 600mm measurement refers to the total length of the espag mechanism. Matching this size with your existing lock is essential to ensure correct fit and reliable operation.

Common signs include a stiff or loose handle, difficulty locking the window, or the mechanism failing to engage properly. Replacing the espag can restore security and smooth functionality.

No, compatibility depends on factors such as spindle position, backset measurement, and overall lock dimensions. Always compare your existing mechanism before purchasing.

If your window is difficult to open, won’t lock securely, or feels worn during operation, the mechanism may need replacing. To learn more, read: Top Signs Your Window Mechanism Needs Replacing (And What to Buy)