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

Item # TH450400
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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. 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 (447)
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Thule Accessories and Parts - TH450400

  • 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

Customer Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (447 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.


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.


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.


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


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


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.


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


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


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.


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


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.


The Thule Snowpack Extender is a great snowboard/ski rack!


Instructions? watch the videos aplenty on etrailer - the Thule box was not helpful but they did go right in and work as shown.


Came with the Thule Evo Wingbar roof racks we purchased! Highly recommend everyone watch the tutorial video!!
Alex our salesperson was awesome to work with


I wish they had been included in the rack package I bought but they weren't. I had to buy them separately. They were easy to install. Considering racks are so specialized to a specific car make and model, I don't know that anyone would try to steal one unless they had the same car as mine. In my case that's unlikely. Anyway, they add a nice finished look to the racks and I'm glad I bought them.


Awesome service. Super fast shipping. Will always look here first to buy what I need.


The etrailer team was very responsive and got me set up with the right system and a perfect fit.


Quick delivery. Keys were missing from box but customer service quickly sent out replacements when I told them. Rails work well.


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!


Thule items are not cheap, but they are QUALITY! When installed on our SUV roof with no existing rails, this rack system is very tight and solid. (To test, “Rock” the rails by pushing up/down on tightened up rail—the whole SUV moves back and forth in response.) Easy on/off as well as we only use when going on vacation. Totally pleased with purchase…keep up the great work, eTrailer!


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
G - 09/12/2020


I bought both the Thule cross bars and the one key system lock cylinders and they arrived in great shape and so quickly I couldn't believe it! I really appreciate that! Thanks as well for the videos those have come in handy!


Etrailer is the best by far. Communication, inventory and fast shipping is outstanding. As for the Thule locks, they were exactly what I needed in my refurbishing efforts of a Thule T2 Classic bike rack. All locks on the ratcheting arms and hitch lock now are matching and operates with the same
key. Installation was super easy.

Show More Reviews

Ask the Experts about this Thule Accessories and Parts

  • Are Thule One-Key System Lock Cylinders Compatible with Thule Sonic Cargo Box
    The Thule One-Key System Lock Cylinders # TH450400 referenced in your question are designed to work with any Thule racks, accessories and roof-rack feet and will work great on your 634 Sonic Cargo Box. If there are locks already installed on the cargo box, you will just need to remove the existing lock cores using the included control key. This set comes with 4 cylinders and two keys. I have attached an installation video for you to check out.
    view full answer...
  • 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.
    view full answer...
  • 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.
    view full answer...
  • How to Remove a Thule Lock Cylinder with Broken Key Stuck Inside
    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...
    view full answer...
  • 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.
    view full answer...
  • Will The Thule Locking Cylinders, # TH450400, Fit On The Thule Tracker II Feet, # TH430
    Yes, the Thule Locking Cylinders, # TH450400, will fit the Thule Tracker II Feet, # TH430. Thule calls their locking system the One Key System. Any Thule product that says it can use the One Key System would use the same locks.
    view full answer...
  • How to Replace Thule Locking Cylinders on a Roof Rack
    When you go to change the lock cylinders on your roof rack to the cylinders of the Thule Locking Cylinders 4 Pack # TH450400 you will insert the included universal change key into an unlocked cylinder that is currently in your roof rack and then remove the cylinder. It may take a little bit of wiggling for the cylinder to work itself loose, but when the change key is inserted into the lock cylinder the cylinder will be free to slide out. Next, you will insert the change key into a cylinder...
    view full answer...
  • 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.
    view full answer...
  • Lock Recommendation for Locking Thule Hullavator to Thule Aeroblade Roof Rack
    To lock the Thule Hullavator part # TH898 to your Thule Aeroblade roof rack you'd need the # TH450400. This comes with four matching lock cores. Two that you'd install in the Hullavator and two that you'd install in the roof rack to lock it to the vehicle.
    view full answer...
  • Installing New Lock Cores In Thule Cargo Box
    For a Thule Cargo Box, you can use the Thule One-Key System Lock Cylinders - Qty 2 # TH450200 or the Thule One-Key System Lock Cylinders - Qty 4 # TH450400. These cylinders come with a master key that will allow you to remove the old cylinders when unlocked and install the new ones. I've attached videos to assist.
    view full answer...
  • Replacement Hinge and Lock Core/Keys for Thule Ascent Cargo Box
    For the Thule Ascent 1600 the correct replacement strut is the part # TH14933 you referenced. For a kit that includes two lock cores and matching keys you would then want the part # TH450400.
    view full answer...
  • How Does Plastic Lock Core Cover Remove From Thule Racks
    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.
    view full answer...
  • Thule UpRide Roof Mounted Bike Rack Fit on 2015 Chrysler Town and Country Factory Crossbars
    The Thule UpRide Roof Bike Rack - Wheel Mount # TH599000 will work with your 2015 Chrysler Town and Country Touring factory crossbars. It will fit a crossbar spread of 24 to 43 inches and you will definitely be able to mount two of these bike racks side by side on your vehicle. It comes with the ratcheting padded hook to secure your bike by the front wheel and then has a ratcheting strap on the rear wheel cradle. It has an integrated cable lock to secure your bike and deter theft. ...
    view full answer...
  • Replacement One-Key System for Sport Track Aero 1300
    If you are missing the Lock Cylinders and Keys for your SportRack Aero 1300, then you will simply need either the Thule One-Key System Lock Cylinders # TH450200 which comes with 2 cylinders, or part # TH450400 which comes with 4 cylinders. The Thule lock cylinders are interchangeable with SportRack options. These are great options if you need to replace the locks as well since either kit comes with a master key which can remove your current lock cylinder.
    view full answer...
  • Lock Core Kit for Thule Evo Clamp Rack Feet TH710501
    Thule Evo Clamp Foot Pack part # TH710501 on the Thule site does indeed show locks are NOT included but can be added. I also called Thule to confirm this is what they show. So, I went to our warehouse and checked several of these kits. Lock cores are NOT included but can be added using part # TH450400.
    view full answer...
  • Lock Core Kit for Thule Rapid Crossroad Kit
    Yes, we do offer the replacement lock core kit you are looking for with part # TH450400.
    view full answer...
  • Will the Thule Outride Work on my 2020 Toyota Rav-4
    Yes the Thule OutRide Roof Bike Rack part # TH561020 will be a great fit for your 2020 Toyota Rav 4. Thule does a great job making sure that it will fit a wide range of crossbar sizes. Really the only time I've ever ran into an issue with any of their roof rack accessories fitting is when the bars are very large like what you would see on an XTerra or Hummer. I really like the OutRide it is very sleek looking and works really well. Their products always hold up really well to constant...
    view full answer...
  • Crossbar Length Needed to Carry Two Thule Hullavator Kayak Carriers
    Your crossbars will need to be at least 60 inches in length in order to carry a pair of the Hullavators, which are the following part number: - Thule Hullavator Pro Kayak Carrier and Lift Assist with Tie-Downs # TH898 I also highly recommend adding locks to the Hullavator to help protect your investment, and for two Hullavators you will need four lock cores, which you can get keyed alike with the Thule One-Key System Lock Cylinders - Qty 4 # TH450400. I have added a link below to a video...
    view full answer...
  • Will the Thule Same-Key Lock Cores Work with My Thule Xsporter 421?
    I have an answer for you. I went ahead and brought your question to my contact at Thule, and she confirmed that the only way to fit the Thule One-Key Lock Cores # TH450200 on your discontinued Thule Xsporter 421 ladder rack is if your rack still has the original locking cam. The locking cam is a part on your rack that has a small opening where the lock core can be installed. For clarification, I went ahead and included a photo of the 422XT Xsporter to show you what yours will look like. If...
    view full answer...
    Image 1 for
  • What Keyed-Alike Cylinders and Keys Do I Need for 2 Sets of Thule Hullavators # TH898?
    Thank you so much for purchasing your 2 Thule Hullavators # TH898 with us here at etrailer. If you are looking to put same-key lock cores in your carriers, you need the Thule One-Key System Lock Cylinders - Qty 4 # TH450400. This kit comes with 4 lock cylinders let you make both pairs of your Hullavators keyed alike. In addition, the kit comes with a universal master key that lets you remove existing Thule lock cores and install new ones. If you are looking for replacement keys for your...
    view full answer...
  • Replacement Locks And Lid Lifter For A Thule Atlantis 1600
    In addition to the Thule One-Key System Lock Cylinders # TH450400, for your Thule Atlantis 1600 XT - Premium Roof Rack Cargo Box # TH686XT, you will also need the Replacement Lid Lifter Hanger # TH14936.
    view full answer...
  • Will the Thule One-Key System Lock Cylinders Work With Thule Evo Raised Rail Feet
    It sounds like your current roof rack uses the Evo Raised Rail Feet # TH710401. The Thule One-Key System Lock Cylinders # TH450400 is compatible with these, or other Thule feet, as long as you have empty lock core sockets or existing lock cores in the feet. If you do not have locks already, pop out the plastic lock plug and install the new core using the universal master key. If you have lock cores, unlock them and use the master key to remove them. Then add the new cores using the master...
    view full answer...
  • Will Two Thule Hullavator Kayak Carriers Fit on 60 Inch Thule Crossbars
    Yes you can; it'll be close and there won't be any wasted space, but Hullavators require 28-1/2" of crossbar space so you will will indeed be able to fit a pair of them on your 60 inch crossbars. I also highly recommend locking the Hullavators to help keep them safe, and here are the part numbers for both the Hullavator and locks: - Thule Hullavator Pro Kayak Carrier and Lift Assist # TH898 - Thule One-Key System Lock Cylinders - Qty 4 # TH450400 The lock cylinders come with two keys...
    view full answer...
  • Can I Clamp the Thule UpRide to My Factory Crossbars on My 2022 Volva XC40?
    The Thule UpRide # TH599000 allows for you to clamp onto crossbars without having to use the T-slot mount. In order to make sure the UpRide can clamp your factory bars on your 2022 Volvo XC40, I recommend measuring your crossbars to ensure that they do not exceed 3-1/8" wide x 1" tall. As long as your measurements do not exceed these dimensions, you are good to go! As far as the lock cores, there are 2 cores involved in each UpRide: 1 that attaches to the clamp and one that attaches to...
    view full answer...

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