Avocet Slimline Offset UPVC Window Espag Rod Lock Mechanism 14mm U Rail 20mm & 22mm Backset

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Avocet WMS Offset Espag Bar Rod UPVC Window Lock Mechanism - 14mm U Rail 20mm or 22mm Backset

An espagnolette multipoint UPVC window lock is the gearing part inside a window that a spindle drive handle operates. This offset mushroom bolt espagnolette is designed for profiles with or without a Eurogroove and can be used on Aluminium, Timber and UPVC window systems. Avocet espags can be fitted to side or top hung windows. This offset espag offers proven reliability at a reasonable cost, this espag can be used as a replacement for many other makes and as long as your backset and rod measurements are identical, then you only need to adjust the mushroom keeps on your window to become compliant with your new espag lock. The offset espag is compatible with all standard espag handles with 43mm fixing centres with a 7mm square spindle.


  • Eccentric cams to provide smooth operation
  • Offset Gearbox
  • Mushroom Cam locking points
  • Endurance tested to 25,000 operations
  • Corrosion resistant
  • Gearbox Body Zinc BS1004A
  • Made by Avocet (WMS)

What's in the pack?

1 x Avocet WMS Offset Espag UPVC Window Lock Mechanism - 14mm U Rail


  • Rail Length: 250mm, 400mm, 600mm, 800mm or 1000mm
  • Cam Height: 8mm
  • Backset: 20mm or 22mm
  • U Rail Width: 14mm

For all measurements please see the diagram in the gallery.

How to identify your window lock - which do I choose? The diagrams in the gallery will help you identify the parts to measure.

Lets look at the things that matter;

  • A - Rail (rod) length - this is the total length of the rod from end to end.
  • B - The distance between screw hole centres. 43mm is the industry standard for almost all Espagnolette rods.
  • C - Cam Height - The height of the projecting locking part on the rod. Often called a mushroom cam due to its shape, it can be used to replace roller cams without problem.
  • D - The Backset - this is the horizontal distance from the face of the lock to the centre line of the handle screw fixing holes.
  • E - Rail width - this is the width of the rod from side to side.

All espagnolette multipoint locks are interchangeable regardless of make but it is essential that the measurements outlined above are correct. If a different make is substituted it is possible that the existing keeps will need to be adjusted to accommodate a slight difference in position of the new cams.

Rail Width:

Rail width - this is the width of the rod from side to side and almost always 16mm, but please check as you may need a slim 14mm rail offset Espag like this one. The image in the gallery will show you where to measure.

Mushroom cams or rollers?

Mushroom Cams are standard on all our Espag locks, these can be used to replace roller cams without problem. Please see image in gallery.

Offset or Inline?

Now you must determine if you require an 'inline' or 'offset' lock. Again use the picture in the gallery to help you. An inline lock holds the gearbox in the centre of the rail whereas the offset lock is set to one side. These are listed separately on our categories page. The new locks will have adjustable mushroom cams that can be moved using an Allen key. If the handle is loose and slips into the closed position too easily you may need to increase compression by adjusting the cams. Likewise if the handle is difficult to close compression may need to be decreased. We advise regular care of your locks with the use of a maintenance spray to prolong life and maintain smooth action.

We aim to deliver your products as quickly as possible. Orders taken before 12:00pm will normally be dispatched the same day. Orders taken after 12:00pm on a Friday will be dispatched the following Monday. For all Next Day Delivery Services (next working day excluding Saturday's) please order before 12:00pm for same day dispatch. Depending on the delivery service selected on checkout, we either use a next-day courier service, Royal Mail Tracked 48 or Royal Mail Tracked 24 postage service.

Free Shipping

Free shipping is available for all order over £10.00, delivery time estimates for free delivery is 3-5 working days.

No Quibble Money Back Returns Policy

Shop with absolute confidence knowing that if you are not satisfied for any reason we will refund the full purchase price providing you return the item within 30 days and in the same condition as when dispatched. Except for those cases where an item proves to be faulty, damaged on delivery or incorrectly described, return delivery charges and postage expenses are not refunded.

How do I return Items?

If you need to return an item please log into your account and click on the orders tab. Locate the order you wish to return and on the right click on 'Return Items?' You will then be taken to the returns tab; on the right hand side enter the quantity you wish to return; then on the left below the item, select the return reason and then the return action (whether you would like a replacement or a refund). If a replacement is not available, we will issue you a refund. There is a comments box to the right if you need to enter any more details.

Once you are happy that all the details have been correctly entered then click on the 'Submit Return Request' button. You will then be sent a return request email from JCP Hardware with instructions.

If you have placed an order as a guest and you wish to return it, then please email.

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