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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. 1-800-940-8924 to order Thule accessories and parts part number TH450400 or order online at Free expert support on all Thule products. Great prices and Fastest Shipping for Thule One-Key System Lock Cylinders - Qty 4. Accessories and Parts reviews from real customers.
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Thule Accessories and Parts

  • Hitch Bike Racks
  • Roof Bike Racks
  • Roof Box
  • Roof Rack
  • Ski and Snowboard Racks
  • Keys
  • Lock Parts
  • Lock Cores and Cylinders
  • 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   (668 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.


It is a great kayak rack for our car. It easily hold both kayaks and it is easy to load and tie down the kayaks. I am very pleased with the product!


Very sturdy. Works well. The attachment to the roof rails on my 2023 chevy suburban works well. The "C" clamp design mechanism holds it tightly and securely in place. No fear of anything coming loose and falling off like other racks I have tried to use.


They work as advertised. No problems. I am giving a so-so rating because Thule should have included locking cores with their plenty expensive products.


Great for locking our car roof rack. Never had a problem.


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


I ordered the one key lock system to secure my crossbars to my vehicle.they installed real easy.


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.


Great for added security, easy to use.


The service I received from "etrailer" is what I expect from any quality retailer. Abigail helped me order the correct items I needed to.

The service Abigail provided was excellent! I wish more retailers would take the time to educate their employees.

Joe C.


The Thule One Lock System works perfectly!


The locks work well.


Very nice same key locks... I have used Yakima for years but went to Thule on my Jeep and am very pleased with the quality of Thule...


Easy to swap out old cylinders to make all locks have the same key.


Great quality and still working well after a year of use.


Fit 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.


Great products, which is what I expected. A part was missing from the original order, however due to great service from etrailer that issue was quickly resolved. Thanks again for excellent customer service.


Spend the extra money on a product that will really secure your kayak so you don't have worry while driving down the road. I ditched a cheaper no name brand in favor of these and couldn't be happier.



Locks still work fine


These locks fit beautifully. I'm glad that I am able to lock my roof rack. I was afraid I wouldn't be able to find the locks but etrailer was able to save the day! Thanks


I originally bought the Thule T2 classic bike rack. First of all if you don’t have a platform rack you need to get one. So much easier to use. Your bikes will not get dinged up. I then bought the 2 bike add on for my rack. Because I don’t always need a rack for more than 2 it was nice that I can easily add 2 if needed. Easy to install and remove the add on. Plus you can never go wrong with Thule and e!

Dave B.


Still love the rack. It’s the best money I’ve ever spent for a rack. I’m always telling friends how great the rack is and the buying experience through e trailer!


My order was processed very quickly and shipped in a timely manner. Everything arrived in great shape. I am pairing my Thule crossbar kit with a Thule Force XT cargo box to increase my capacity for hauling camping gear for a family of 4 in a 2019 Subaru Forester. The installation and product review videos on your website are very helpful.

Matthew B.


We are still using the crossbars and locking kit and they seem to be holding up just fine.


Very nice and easy to install


I am very happy with the Tulle carrier. However, I was missing one part that I had to call and have shipped to our destination. I spent several hours making a substitute part so that I could use the carrier to take to Florida. Everything is working now and I am waiting for the part.


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.

Brian M.


Awesome, investment is paying off. Be careful with the parking garage


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.


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.

Show More Reviews

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