A gold-colored metal window mechanism component, possibly made of brass or another alloy, with a visible screw and mounting bracket.
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 mechanism component, possibly made of brass or another alloy, with a visible screw and mounting bracket.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 - 250mm – Replacement uPVC Window Part

AvocetSKU: HS2662
162 reviews from verified buyers
Price:
£6.99

Save £15.00 — limited stock at this price

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

An offset espag window lock is a locking mechanism commonly used in uPVC windows where the handle spindle is positioned off-centre. It secures the window by engaging multiple locking points along the frame.

The 250mm size refers to the overall length of the espag mechanism. Matching this measurement with your existing lock is essential for correct fit and smooth operation.

Common signs include difficulty locking or unlocking the window, a stiff handle, loose mechanism, or the window failing to close securely.

No, compatibility depends on factors such as spindle position, backset, and overall dimensions. Always compare your current mechanism before purchasing a replacement.

If your window becomes difficult to operate, doesn’t lock properly, or feels worn, the mechanism may need replacing. To learn more, read: Top Signs Your Window Mechanism Needs Replacing (And What to Buy)