A gold-colored metal window lock mechanism with an offset espag, positioned against a plain background.
Technical drawing illustrating an offset gearbox for a UPVC window lock, showing a red window profile positioned to the left of the locking mechanism. The diagram contrasts the offset gearbox with an inline gearbox for comparison.
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 illustrating an offset gearbox for a UPVC window lock, showing a red window profile positioned to the left of the locking mechanism. The diagram contrasts the offset gearbox with an inline gearbox for comparison.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 - 800mm – Replacement uPVC Window Part

AvocetSKU: HS2665
Price:
£8.99

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
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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 800mm offset espag window lock is a multipoint locking mechanism designed for larger uPVC windows with an offset handle spindle position. It secures the window by engaging multiple locking points along the frame.

The 800mm size refers to the total length of the espag mechanism. It’s important to match this measurement with your existing lock to ensure correct fit and smooth operation.

Signs include difficulty turning the handle, the window not locking securely, stiffness in the mechanism, or visible wear on the lock components.

No, compatibility depends on spindle position, backset size, and overall window dimensions. Always compare your current mechanism’s specifications before purchasing a replacement.

Choosing the correct mechanism depends on your window type, locking setup, and size requirements. To learn more, read: How to Choose the Right Window Mechanism: Friction Stays & Espagnolette