uPVC Window Lock Inline Espag Locking Mechanism Window Locking Rod -

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uPVC Window Lock Inline Espag Locking Mechanism Window Locking Rod



Inline uPVC Mechanism Espagnolotte Window Lock. Double Glazed Window Espag. Window Lock Mechanism. Window Lock Rods.

The flat rail inline espag mechanism can be used on Aluminium, Wood and uPVC window systems. This mechanism is compatible with all standard espag handles with 43mm fixing centres with a 7mm square spindle. Our mechanisms can be fitted to side or top hung windows.  Inline means the spindle goes straight through the gearbox and flat rail which means it has flat base.  If you require an offset mechanism please email us HERE and we will sort this for you.

It is vital that you measure the BackSet on your mechanisms before ordering please refer to the diagram; your BackSet will either be 20mm or 22mm.  If you order the wrong one or cannot get an exact match to your ‘BackSet’ some fitters have said they open up the hole size on the frame with a chisel or drill by a few mm. However, this is a suggestion and not a recommendation and you do this at your own accord and we take no responsibility for any damage done by a madman with a drill.  (Fr. Ted and the little dent on his car comes to mind)



Mechanism Length

350mm, 550mm, 750mm, 950mm, 250mm, 400mm, 600mm, 800mm, 1000mm, 1200mm


20mm, 22mm

uPVC Window Lock Inline Espag Locking Mechanism


A window espag (espagnolette) is a window locking system, it is the locking rod or bar that goes up the side of the window, this rod has a “mushroom” roller cam on it and they move up and down, or side to side (if a top hung window) when the handle is turned, this pulls the window into the receiver/keeps and seals the sash to the window frame to ensure safety and stop drafts from coming in the windows.  The inline window locking mechanism espag espagnolette


  • Mushroom cams to provide smooth operation which you can adjust with an Allen key approx. 1-2mm
  • Inline gearbox
  • Available in OffSet HERE
  • 20mm or 22mm BackSet
  • 7mm Mushroom Cam Height
  • Faceplate width: 16mm
  • Corrosion-resistant
  • Faceplate in steel, gearbox in zinc die-cast
  • 7mm square spindle

Please Note:

Please check your replacement window locks ‘Backset’, this is the distance from the front of the lock to the center of the spindle as shown here.  This is to ensure your new window lock will fit into the position of the old one, however, if you cannot get the exact match it is possible to open up the hole on the frame by 1-2mm with a drill.  It is also advisable to ensure you order the right length window espag for your window.  As we have several suppliers our espags can differ from the photos shown, some of our espags are shorter than the one you ordered, this is not an issue and you just need to retap the screws in the new holes and push the receiver to the new mushroom cam position.

This window locking mechanism is also suitable for most PVC windows, it is also suitable for Munster Joinery Window Repairs.  Do you need mechanism keeps or receivers?  You can choose from our window lock receivers here.

You can order offset window lock mechanism HERE.

Click HERE for the returns form.  This MUST be filled out and all returns must come with these returns for, otherwise, we cannot accept them,

If you have queries on any of our products or if the part you require is not on our site please use our CONTACT FORM to send us a picture or part number of the part you need, we will get back to you and get you sorted ASAP.

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Mechanism Length

350mm, 550mm, 750mm, 950mm, 250mm, 400mm, 600mm, 800mm, 1000mm, 1200mm


20mm, 22mm

11 reviews for uPVC Window Lock Inline Espag Locking Mechanism Window Locking Rod

Based on 11 reviews
5 star
4 star
3 star
2 star
1 star
  1. Michael H. (verified owner)

    Easy order process, quick delivery, items well packaged and arrived in top condition. Product exactly as ordered quality seems fine but early days yet, hence provisional score of 4 out of 5 . Mechanism lubricated before fitting and protective coat applied to bottom of rail to prevent rusting as it is manufactured from mild steel.

  2. Peter G. (verified owner)


  3. William C. (verified owner)

    Works like a charm

  4. Paul W. (verified owner)

    Part looked slightly different but fitted perfect, as the original part is obsolete.

  5. Kevin M. (verified owner)

    Easy to fit once you’ve done it once…and have watched the right Youtube videos!

  6. Anonymous (verified owner)

    Product exactly as described 👍.

  7. Anonymous (verified owner)

    Slightly different to existing damaged mechanism but with some adjustment will work fine as a replacement.

  8. Mark O Sullivan (verified owner)

    Quality products at a decent price and fast delivery not much more you can ask for

  9. Alan. W. (verified owner)

    Great quality easy to fit

  10. Shane M. (verified owner)

    Appears to be good quality

  11. david mc redmond (verified owner)

    Good part

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(11 customer reviews)