A silver-colored metal window lock mechanism designed for use with UPVC windows.
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 22mm).
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 with UPVC windows.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 22mm).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 - 800mm – Replacement uPVC Window Part

AvocetSKU: HS1991
162 reviews from verified buyers
Price:
£8.99

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 800mm inline espag window lock is a long multipoint locking mechanism used in larger uPVC windows. It secures the window by engaging multiple locking points along the frame for enhanced security.

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

Signs include difficulty turning the handle, the window not locking properly, or visible wear on the mechanism. Replacing a worn espag restores smooth operation and security.

No, they are typically used for larger windows. Compatibility depends on backset, spindle size, and overall window design, so always check your current specifications.

If your window is hard to operate, doesn’t lock securely, or feels loose, the mechanism may be worn out. To learn more, read: Top Signs Your Window Mechanism Needs Replacing (And What to Buy)