A silver-colored metal window lock mechanism designed for use in UPVC windows, featuring an inline gearbox.
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 silver-colored metal window lock mechanism designed for use in UPVC windows, featuring an inline gearbox.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 - Inline Espag - 250mm – Replacement uPVC Window Part

AvocetSKU: HS1988
162 reviews from verified buyers
Price:
£6.99

Key benefits

  • Inline espag mechanism - modern flush-fit window locking
  • 250mm to 800mm lengths - match your window height
  • Universal direct replacement - fits most uPVC casement windows

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Description

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

Gearbox is positioned centrally on the rail (inline)

Important Measurements

1) Overall length

2) The 'Backset' (20mm, 22mm)

4) Rail Width (Usually 16mm)

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Frequently Asked Questions

An inline espag window lock is a locking mechanism commonly used in uPVC windows. It operates by engaging multiple locking points along the window frame when the handle is turned, improving security and sealing.

The 250mm measurement refers to the length of the espag mechanism. It’s important to match this size with your existing lock to ensure proper fit and function.

Signs include difficulty turning the handle, the window not locking securely, or visible wear on the mechanism. Replacing a faulty espag helps restore smooth operation and security.

Compatibility depends on factors like spindle size, backset, and overall length. Always check your current lock’s specifications before purchasing a replacement.

Selecting the correct mechanism depends on your window type, size, and required security level. To learn more, read: How to Choose the Right Window Mechanism: Friction Stays & Espagnolette