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Thule One-Key System Lock Cylinders - Qty 4
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Thule One-Key System Lock Cylinders - Qty 4

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This kit lets you add new locks or replace existing cores for all your Thule products. These keyed-alike cylinders let you lock your racks, accessories, and other gear with one key. Extra-thick tumblers help prevent forced opening. 1-800-496-5010 to order Thule accessories and parts part number TH450400 or order online at Free expert support on all Thule products. Guaranteed Lowest Price and Fastest Shipping for Thule One-Key System Lock Cylinders - Qty 4. Accessories and Parts reviews from real customers.
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  • Reviews (548)
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Thule Accessories and Parts

  • Hitch Bike Racks
  • Roof Bike Racks
  • Roof Box
  • Roof Rack
  • Ski and Snowboard Racks
  • Lock Cores and Cylinders
  • Keys
  • Thule

This kit lets you add new locks or replace existing cores for all your Thule products. These keyed-alike cylinders let you lock your racks, accessories, and other gear with one key. Extra-thick tumblers help prevent forced opening.


  • 4 Lock cylinders let you make all your Thule accessories keyed alike
    • Replace existing Thule locks or add new locks to racks, carriers, and other gear
  • 2 Premium, over-molded keys are comfortable to grip and easy to identify on your key chain
  • Universal master key lets you remove existing Thule lock cores and install new ones
  • Enhanced security with extra-thick tumblers and long protrusions
    • Helps to prevent forced opening with screwdriver or like device
  • 2-Year limited warranty

Note: Key numbers should be recorded on Thule's product registration page and written down in the space provided in the One-Key System manual.

Key Number location

Thule's One-Key System makes it easy to secure all of your Thule racks, accessories, and other gear with just a single key. This kit includes 4 keyed-alike lock cylinders that are designed to mount in the empty lock core sockets of your Thule rack or to replace your rack's existing cores. It includes 2 over-molded keys that are comfortable to grip and easy to identify on your key chain, and 1 universal master key for adding or replacing lock cores.

Thule Traverse foot pack accepts OKS cylinders

Many Thule products - including roof rack feet - come ready to accept One-Key System cylinders. Just pop out the plastic lock plug, then use the included universal master key to install the new core in its place.

Thule Flat Top ski carrier accepts OKS cylinders

To replace an existing lock core simply unlock it and use the included master key to remove it. Once the existing core has been removed, pop in the new One-Key System lock.

450400 Thule One Key System Lock Cores with Keys - 4 Pack

Replaces Thule TH544

Item # TH450400

Customer Satisfaction Score:

Customer Reviews

Thule One-Key System Lock Cylinders - Qty 4 - TH450400

Average Customer Rating:  4.9 out of 5 stars   (548 Customer Reviews)

This kit lets you add new locks or replace existing cores for all your Thule products. These keyed-alike cylinders let you lock your racks, accessories, and other gear with one key. Extra-thick tumblers help prevent forced opening.


This is my first Thule product but not my last. etrailer was great to deal with the videos on how to install the product were so helpful. Between etrailer's help and all the reviews that other people had purchased and posted made this a very pleasant purchase and install. I highly recommend etrailer and the complete Thule WingBar system including the keylocks that worked perfectly.


Car: 4 door Civic Sedan

process was easy as I was able to search for the set that matched with my vehicle. I originally had ordered locks along with my set, but they were out of stock. But they were very flexible in allowing me to cancel that item and have my rack set processed and shipped right away. Fairly fast delivery, I believe it took about a week or so.

Assembling it was very simple with the instruction manual if you read it carefully, there is also a helpful video if you need it. Had a little bit of a struggle with spacing out the cross bars in order for it to fit my ski carriers that I already had (but I did expect this).

The final product is actually fantastic. Immediately slapped my snowboard into it and ran it out for a drive. Peaked at 70 MPH with no issues of it falling off or wind whistling.

Definitely worth it to spend the extra money to buy quality like this. Even better when the folks selling it do a great job handling your order and shipping!

Review of Entire set: After a year of using this, it still works very well. Easy to take on and off your car and make slight adjustments if needed. Only maintaining is really just cleaning it which is simple enough. No issues with lockingunlocking with the keys. It has definitely helped saved space for my tiny Honda Civic.
Steven - 08/22/2022


I've been using the Thule lock system for one year now and am totally satisfied. Locks performing just like the day of installation. Good product - they keep my Thule Hullavator system secure.


Locks are quality and work flawlessly! Wish these locks were compatible with the Skinny Warrior SKS Locking Brackets, so it would truly be one key access all around. The way it was explained was that it could be done…. For $25 extra per lock? So $75 for the locking brackets (2) plus an extra $25 for each lock to have them re-keyed. Just a heads up for anyone looking to do the same. Looks like it’s 2 keys for this rig! NOT ETRAILER’S FAULT…. QUALITY AND SERVICE WAS A 10/10!


I purchased the Thule Wingbar Evo bundle and before installing it, I decided I should also get the locks, since it was such an expensive project. The whole install was pretty simple, and the locks went in quickly with the included instructions. It's definitely worth the $$ to protect my investment.


Happy to be able to secure the racks to the roof of my car. I am so happy with the service I received from, with a huge shout-out to Kennica C. who answered all of my questions and made sure I ordered exactly what I needed and helped me with a payment issue, she was incredible!!! I also received everything I purchased in a timely manner! I could not e happier!!!


The locks work as advertised. Installs in seconds. Be sure to keep the master key if you ever want to remove the locks.
Also, order the locks at the same time if you have multiple bike racks. That way they are all keyed the same.


Worked well. Given the cost of a rack system, though, it would be nice if Thule included the locks for the price of the package.


The shipping was fast! The instructions were very clear and the items were all very easy to install! Overall - this was a fantastic buying experience from etrailer.


Bought these locks for securing a roof rack with Thule Evo Flush Rail Feet. Perfect fit and ease of use. I wanted to protect my investment since it could be removed with an Allen wrench without the locks.


Thule gear. Aero crossbars and bike rack. Built well and dependable operation. The lock cores and keys are a must. Nothing but quality items and service from


The keys work well with the hullavator.


the Thule Car Carrier is my first purchase best decision i made to support our travel needs. we enjoy road trips and loaded the carrier with 4 suitcases and 2 large soft bags on our trip to Orlando. Easy to install and take down. did not feel the carrier on the vehicle, well balances.

Awesome, investment is paying off. Be careful with the parking garage
Brian J - 12/08/2021


Love the rack! I use these to racks hold two 29" full suspension MTB and have had zero issues... Easy on and off and the locks work great.


Easy install, great replacement that adds that extra layer of security


Once again etrailer had exactly what I needed. Even though the item was out of stock when I ordered it, I got regular updates about when it would be available. The item was restocked quickly and I received the Thule locks well before I really expected them. Great videos provided to show me how to install the locks. Great customer service as usual!

Still going strong! The quality of this roof rack is exceptional. Carries my canoe and kayak with ease.
Linda - 11/22/2021


Very easy to install with the instructional videos. Roof racks were great and I have no complaints - they fit fine and did exactly what they were supposed to do. Thanks!


Purchased these for my new roof rack mounted bike carrier, worked great.


Superb service from everyone at etrailer
One of the top 2-3 companies I’ve ever dealt with
Excellent product from Thule
5 stars all around


Customer Service: Carol C. from etrailer provided excellent customer service. I'll be back.

Product: This is an OEM Thule product, so it's as good as it'll get from Thule.

Price: Cheaper here than Thule's site with an added ProDeal discount code.

Shipping: Relatively slow, but worth it for the price (I wasn't in a hurry anyway).


etrailer was the only place that was able to provide a solution for me! I have a 2022 GLC Benz with panoramic roof. I spent many $$ for Benz’s own cross bars. They looked great…integrated with the roof seamlessly. But I couldn’t open the panoramic roof! MAJOR FAIL!!

etrailer customized a set of Thule cross bars that not only work with my panoramic roof but are quieter and look even better than the Benz product. MAJOR AWESOME to etrailer. Now listing my Benz cross bars on Craigs.


I'm sure they're great, but the set I ordered was during a shortage and never showed. Only giving stars based on customer service from the folks at eTrailer, which was consistently fantastic.


The One-Key lock system installed very easily and works perfectly. Very happy with my purchase!


Working with has been nothing short of great! I placed an order for merchandise for my Tacoma pickup last Oct or Nov; at least one item was on backorder. I used paypal for payment. I was notified along the way about the status of my order. Nothing came through from paypal during the waiting period. Once the order was complete, I was notified about this several times by etrailer and when the order was finally ready for shipment, was asked once more to confirm/verify the payment option with paypal. The order was shipped via UPS from the midwest to Hawaii and arrived quickly and in perfect condition. Product value (pricing/quality) is top notch; when I realized I had forgotten a small item that should have been included with the original order but had been omitted in error, they quickly resolved the issue and the "missing" item was shipped quickly and efficiently using the same payment option as on the original order. In short, working with etrailer has been a pleasure. I might add that I was referred to them by my local Linex dealer who does this sort of work for his customers on a regular basis. He told me to "work with etrailer, you won't be disappointed". I wasn't. Mahalo nui loa, etrailer


Bought a Thule hullivator from a private party and had to purchase additional items to get the whole thing put together for my car. I received some additional guidance as to what length crossover bars I needed and the installation was easy, It all worked. Very happy.

Show More Reviews

See what our Experts say about this Thule Accessories and Parts

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    The only way to remove a Thule lock cylinder like the ones in # TH450400 is by inserting the master key into a cylinder in the unlocked position. However, I have a few tips and tricks to help you remove the broken key to allow for the master key to be used. The first thing is to spray a generous amount of oil lubricant into the key hole. Your key was probably hard to operate before it broke so the lubricant will help the key slide out a bit easier. Next, make sure that the lock is completely...
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  • Can Thule One Key System Replace Thule Lock Cores TH544
    Yes, if you had a Thule lock kit TH544 installed you could replace them with the Thule One-Key System part # TH450400 that you referenced.
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    We do have one option for a 4-bike rack that is rated for use on the rear of a motorhome, and has the capacity needed to carry a pair of electric bikes and a pair of standard bikes, which is from Thule: - Thule T2 Pro XTR Bike Rack for 4 Bikes # TH69TX This rack does have a capacity of 60 lbs per bike, or 160 lbs overall so it will have the capacity needed for both your 60 lb e-bikes and a pair of standard bikes. The T2 Pro XTR # TH69TX is wheel-mounted so there is no contact with your...
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  • How Does Thule Lock Core Replacement Install in Sears Cargo Box
    Use the current key you have for your Sears box to unlock the box, insert the change key that came with the # TH450400 and then pull the lock core out with the key. Next put the change key into the new lock cores and then insert them into the cargo box.
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  • Will the Rapid Gutter Feet # TH300R Fit all Gutter Mounts?
    I have an answer for you. From the looks of your photo, it looks like it is the Rapid Gutter Feet for Thule Crossbars - Rain Gutters TH300R. However, even though the knobs on the Rapid Gutter Feet involve a space for Thule Same-Key Lock Cores # TH450400, the knobs on the feet cannot be purchased individually. The feet will not fit all gutters on your vehicle because they are specifically designed. In order to confirm whether these feet will fit your gutters, I would be happy to assist...
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    Image 1 for
  • Recommended Locks For Thule 460 Podium Rack
    For your Podium rack we do not offer a replacement bolt with tamperproof heads. I recommend the Thule One-Key System Lock Cylinders, part # TH450400. This set comes with 4 cylinder locks and keys that unlock all of the cylinders. Cylinder locks can be a deterrent to theft when installed, providing more security, and giving you more peace of mind. I have linked you to a product review video for these locks.
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  • Are Locks Available For Thule WingBar Roof Rack System For 2014 Toyota Prius V
    Yes we do carry the locks you can use with the Thule Roof Rack System you referenced for your 2014 Toyota Prius V. I recommend the Thule One-Key System Lock Cylinders, part # TH450400. This 4 lock system is designed to fit the empty lock core sockets in your Thule rack, and uses one key for all locks. I have also included links to some of our product pages of items that would work for a roof rack system.
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  • Will Thule Lock Cores work with a Peloton Bike Rack Mount
    The Thule lock cores # TH450400 will work with the Peloton bike rack mount. I checked with Thule to clarify as well.
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  • Lock Core Set Recommendation for a Thule 421 Xsporter
    Yes, we carry a 4 lock core set that would work on your Thule Xporter 421 ladder rack. For that you would want the Thule One-Key System Lock Cylinders # TH450400.
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  • Way to Lock Thule Roof Rack with Gutter Mount
    If you have a Thule gutter mount roof rack why not instead replace the plastic cores with lock cores like with the Thule One Key System part # TH450400? This would give you the anti-theft deterrent you want and wouldn't require you to remove any portion of the rack.
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  • Lock Cylinders Needed for the Thule Crossroad Foot Pack 450
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    There is a small gap between the plastic cap and the outer edge of the lock core hole that is just large enough to allow you to insert a small, flat tool such as a flat head screw driver. Once you have the tool inserted, you will pry upward forcing the cap out. Check out the link to a similar question that I attached for you that has a video showing how to remove the plastic cap and insert the lock core.
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  • What 4-Lock Set do I Need to Change out the Cylinders on My Thule Accessory?
    If you are looking for the Thule lock cores that match key code N249, we unfortunately do not carry replacement keys or lock cylinders that work with that code. The only thing you can do is purchase a new set of keyed-alike lock cores # TH450400. The cylinders that come with this kit have a new key code and are not coded specifically to N249. Also, the # TH450400 comes with all parts required to change out the locks on your accessories.
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  • Will the Thule Outride Work on my 2020 Toyota Rav-4
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  • Will the Thule Same-Key Lock Cores Work with My Thule Xsporter 421?
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  • Can Plastic Lock Cores On Thule Products Be Replaced with Metal Locks
    The plastic lock cores that come with select Thule product can all be removed and then replaced with metal versions, the Thule One-Key System Lock Cylinders part # TH450200 for two or part # TH450400 for four.
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