Can I get a replacement key for my Jackloc?

Yes you can get replacement keys for your Jackloc window cable lock.

If you have moved into a property where a Jackloc is fitted and there are no keys, or if you have lost your key we can sell you a copy if you own the property or have landlords consent.

Please call us on 01455 220616 and we will manage this for you.

Can I use normal screws or do I have to fit the security screws which come with my Jackloc?

We provide Grade 4 security screws as standard with each Jackloc in order to provide maximum window safety and security. The screws cannot be drilled out, and do not weaken at the same rate as traditional screws which is why we use them.

Because of this, our 10 year Jackloc guarantee is only valid on Jacklocs that have been fitted with the security screws provided. Traditional screws can be used, but please note that the Jackloc guarantee will not be added.

Can I screw a Jackloc into a UPVC frame?

Yes you can. You can screw or drill the screws into the frame as normal.

There are different types of UPVC frames some come with steel reinforced chambers, where the screws will benefit from greater anchorage. If you have UPVC windows with hollow chambers then our screws will still function, but we stress, you should carry out regular checks to ensure the Jackloc is still safely secured to the frames.

Will fitting a window restrictor damage my window?

A Jackloc, or any retrofitted window restrictor, is fixed to the window frame with screws that will show holes if you were to remove it. However, Jacklocs are designed to last for over 10 years so will protect your windows whilst needed.

Will fitting a Jackloc affect my window warranty?

Please check with your window manufacturer regarding any impacts on warranty of fitting a window restrictor. A high-quality restrictor supplied by Jackloc will not impact the performance of the window.

How do I measure the 100mm gap opening?

To correctly measure the gap for your window cable lock, open the window before fitting the restrictor.

Measure a gap of 100mm with a measuring device and then position the lock where it’s taut on the frame. You can then mark and drill the pilot holes to achieve a 100mm gap opening. For young children, we recommend only an 89mm gap and using the same methodology.

Can Jacklocs be used on top hung velux windows?

Yes, all of our Jackloc window restrictors can be fitted to inward opening windows. Simply position the lock on the side of the frame of the window to set the 100mm gap.

For more information on fitting a window restrictor to an inward opening window, read our guide here.

What does “tested to 3400 newtons” mean?

This is the weight measurement that our independent testing house uses. The relevant British Standards state that a window restrictor should hold 600 Newtons but we test to exceed this in order to make windows as safe and secure as they possibly can be.

Where can I find fitting instructions?

You will receive Jackloc window restrictor fitting instructions with your Jackloc window lock and can also find them on each individual product page on our website. Please also take a look at our videos for more information.

Can I buy a combination of different types for different windows?

Yes you can buy a maximum of 12 Jacklocs in each category. Simply add them to the Shopping Cart and the delivery quote will automatically be adjusted.

Can I use a window restrictor on a door?

Yes, you can use a cable window restrictor on a door. We would recommend the Pro 5 Duo cable window lock for patio doors as the cable can be removed if you would like the door to be fully opened.

How can I replace a lock if the key is broken or lost?

Please get in touch with our team and we will provide you with a cost for a replacement.

Will a Titan fit on a chamfered window?

Yes. The Titan window lock comes with a variety of spacers in different sizes, and different screw lengths so most window frames can be accommodated. We are happy to have a look at your windows in question via a no-obligation free video survey, simply contact us and we’ll have a look.

Can cables be shortened?

Yes cables on the cable window locks can be adjusted if required. Our team will work with you to provide the best solution for you.

Can cables be lengthened?

All of our cable window restrictor products are tested with a 200mm cable. However we can lengthen a cable up if required. Please contact our team for more information. To help prevent children and vulnerable adults from falling we would always recommend a 100mm gap maximum in these situations.

Can Jacklocs be used for pets?

Yes, Jacklocs can be used to create a gap to provide fresh air whilst keeping indoor pets inside.

Can I get a Jackloc painted in a different colour?

Yes, we offer our Pro 5, Pro Twist and Titan by Jackloc products in white, black, brown and grey as standard. We can also RAL match our products if required and have done so for many projects. Please get in touch with our team for more information.

How can I remove the screw cap cover?

The screw cap cover is a cosmetic cover to hide the screws. To remove, simply use a sharp object to release the cover.

I don’t know what lock to use, can you help?

Of course! Our team are fully trained and happy to provide a no-obligation video site survey or answer your queries by phone or email. Please get in touch with our team for more information.

Can Jacklocs be used on egress windows?

Some building regulations specifically state that an egress window must be unrestricted. Our Pro Twist cable window restrictor product does not require a key and therefore can be manually opened in an emergency on an egress window. Fire officers have also advised clients that in the event of an emergency and a person being trapped in a room, their main route into the room will always be to break the glass to obtain access.

We strongly advise you risk assess the likelihood of a possible fall from a window versus the likelihood of a fire trapping somebody in a room.

Do you ship internationally?

Yes we do. Please either contact us or request a shipping quote via our product pages and we will get back to you with delivery details.

How do I get a quote for a bulk order?

Simply “Contact Us” via our website form or our email with the quantities that you are looking for, and a member of our team will be in touch within 24 hours.

Do you offer free delivery?

Our courier services are for a fixed fee depending on how many Jacklocs you buy.

When will my Jackloc come if I order it on the website?

We offer a next working day mainland delivery service for all orders received by 3pm. UK Islands typically take 1-5 days to arrive depending on the location. We use a courier service to manage our deliveries. We ship internationally and can provide a shipping quote on request, simply request one on our product pages.

My payment has failed, what can I do?

Please call our office on 01455 220616 if you have any problems paying online and a team member will be able to take your details securely over the phone.

How to remove a window restrictor?

To remove a window restrictor, either to replace it or because it’s no longer needed, (assuming our security screws supplied with the product have been used to secure the restrictor), you will need to drill the heads from the screws. This can be done with a tungsten carbide drill. Then to remove the two body compartments attached to the opening window frame and the fixed cill, wall or window, simply lift the parts from the remaining screw.

To over-ride a window restrictor so that the window can be opened further than 100mm use either the key supplied or the push and twist mechanism. Note that the Perma window restrictor can’t be over-ridden without removal.

Do you have videos for fitting window restrictors?

Yes, we do have a video for how to fit a window restrictor 

We also provide instructions with your window restrictor and you can see an overview here. Fitting window restrictors is a very quick and simple DIY job.

How to open window restrictors

How to open window restrictors depends on the type of window restrictor in-place.

Windows with the Key-locked Pro-5 and Pro-5 Duo can be opened wider than 100mm using the key and simply opening the window as usual. The key releases the restriction mechanism until locked again.

Windows fitted with the folding Titan window restrictor can be opened winder than 100mm using a key and opening the folding mechanism.

Windows restricted by the keyless Pro-Twist cable window restrictor can be opened the restrictor’s Push and Twist mechanism which unlocks the restriction.

Windows fitted with the Perma can not be opened wider than 100mm without removing the window restrictor.

What to consider when fitting a window restrictor?

The key considerations when fitting a window restrictor are:-

1: The type of window restrictor that’s right for your situation. You can choose from key-operated, push and twist mechanism and permanently locked options.

2: The quality of the window restrictor, ensure you check that the product has the appropriate British Standards certifications.

3: Check the quality of the window frame. Window restrictors should be fitted to frames that are in good repair with no damage.


We are here to help

Find out how Jackloc® can help with your requirement.

Contact Us or Call our Commercial Team on 01455 220616.

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