A silver-colored metal window lock mechanism designed for use in UPVC window frames.
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 in UPVC window frames.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 - 600mm – Replacement uPVC Window Part

AvocetSKU: HS1990
162 reviews from verified buyers
Price:
£7.99

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

A 600mm inline espag window lock is a multipoint locking mechanism used in uPVC windows. It secures the window by engaging multiple locking points along the frame when the handle is turned.

The 600mm refers to the total length of the espag mechanism. It’s important to match this measurement with your existing lock to ensure proper fit and smooth operation.

If your window handle is stiff, the lock isn’t engaging properly, or the window won’t secure tightly, it may be time to replace the espag mechanism.

No, compatibility depends on factors like spindle size, backset, and window dimensions. Always compare your current lock’s specifications before purchasing.

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