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Secure your valuable hitch with ease using the Curt lock set for adjustable channel-style mounts. Each set is keyed alike, meaning you'll have one less key to worry about and complete peace of mind knowing that both pins can be locked or unlocked with the same key. Whether you're safeguarding your 2" or 2-1/2" hitch receivers, these locks ensure a consistent and reliable solution against theft.
No more worrying if your lock set will fit your equipment. Designed for use with Curt Channel Style Adjustable Ballmounts, this lock set accommodates both 2" and 2-1/2" hitch receivers like C45900 and C45927. With pin inside widths of 3-1/4" and 4-1/4", as well as a straightforward pin diameter of 5/8", they maintain the full capacity of your ball mounts while fitting seamlessly with the configuration of your vehicle.
Get the durability you need with steel locking pins that withstand extensive use and environmental conditions. Engineered for frequent use without losing integrity, these pins remain robust even with continuous engagement – perfect for ensuring your trailer hitch stays exactly where you want it.
Adapt to a variety of hitching needs with two pin lengths (3-1/4” and 4-1/4”), ensuring a perfect fit no matter the configuration of your trailer or vehicle. This design consideration means whether locking your hitch receiver or securing the ball housing, these pins offer the flexibility required for any towing configuration.
Never find yourself without access to your locks with the inclusion of four keys, all keyed alike. Whether stored in a car, on a keyring, or as spares in your workshop, you'll have convenient access whenever you need it, minimizing the risk of misplacing your way into a secure hitch theft deterrent.
Designed with practicality in mind, the Curt lock set features a smooth locking mechanism that is easy to engage or disengage. Whether young or old, the straightforward process of securing or unlocking ensures a user-friendly experience, letting you focus more on your adventure than on its logistical preparations.
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Speaker 1: Today we'll be taking a look at the Curt Channel Mount Lock Set, part number C23556.Without any locks, this could be you.But with our locks installed, you're safe and secure. This locking system is designed to work specifically with your Curt Adjustable Ball Mount, part number C45900, and C45902. Both locks feature a barbell style clamping mechanism that will work with either the hitch pin or the ball mount pin. Four keys are included, and any key will work with any of the matching locks. There's a dust cover on the end of each lock to keep out dirt and grime. The curved handle on the hitch pin makes for easy removal and installation.They feature a 6-1/4" overall total length.Included in the kit you'll get one hitch pin, one ball pin, and two locks.
These locks are keyed the same, so you have a total of four keys.We will start by installing the hitch pin. Remove the old one, slide in the new one, unlock your lock, slide it on, lock it up, and close the dust cover. Next, we'll install the ball pin. Remove the old pin, slide in the new locking pin. Again, unlock the lock, slide it on, lock it up, close the dust cover, and you're good to go.
Either pin can be replaced with the locking pin to secure your ball mount. Now, with our locks installed, we can feel safe knowing that our ball and our adjustable mount aren't going anywhere.That completes our look at the Curt Channel Mount Lock Set, part number C23556.
After a year of use, the lock set is in great shape! It is a bit cumbersome having to grab the keys to remove the hitch but that is much better than the hitch coming up missing...just the nature of the beast!
The locks are big enough to fit both my hitch and ball hitch. 4 keys included makes it very convenient. Shipped very quickly.
This locking pin is definitely long enough for the Curt 14,000 lb adjustable ball mount. In fact, its probably about a half an inch too long. The locking part flops around a bit, I wonder if it would come off with a good smack from a hammer. I'm going to try shoring it up with a few 5/8 inch washers.
Though the product looks to be of good quality, the design in my opinion is poor. When the locking portion is attached to the pin(s), there is a gap between the two. This gives a purchase point to a would-be thief to get a prying tool in there. This may seem nit-picky, but this is a security lock set that is supposed to protect a trailer and hitch ball assembly.
As others have stated, these are good locks but it does appear to have a weakness of being able to pop the lock off with a pry bar.
David P. 
5/2/2024
I have used these items quite a bit over the last year and I am pleased with them. The only concern I have is that they dont seem to be a very strong locking mechanism. I feel like it wouldnt take much to pry off the lock. But so far no one has stolen my drawbar.
We carry several different trailers for our adapted sport programs, which meant we needed to get a hitch receiver with an adjustable height. This lock worked perfectly for our situation and would buy it again for our next truck.
Wes
1/28/2021
Great lock and we have had no issues
Seems to be sturdy enough to keep my new Curt 45900 adjustable trailer hitch secure to my vehicle. I like the fact that the keys are all the same. etrailer customer service is great! Thanks to Michelle!
James
12/26/2022
Health issues have prevented me from using it. Hoping 2023 is a better year.
The lock set doesn't fit well with the Curt hitch C99NR. The locking pin is a smaller diameter than the non-locking pin and it allows for some slop. Not sure I'll use it.
Victoria H.
3/4/2025
Hi John, I know that wasn't a good experience but I would be happy to help you get this sorted out. If you haven't used them yet, we can help you with getting these returned. A compatible option you could use with the ball mount # C99NR is the InfiniteRule Lock # IR36FR. The ball mount # C99NR uses pins # C56NR which are 3/4" in diameter and have a usable length of 3-3/4".
Bought in fall of 2018. Kept them lubed up and they worked flawless, until the day I left it on my back bumper after taking off the hitch and driving away. But in the two years I did have them. Flawless! I would have gotten them again, but by time I realized what I had did, I needed something now. FYI: Cheap ones don't last as long.
I chose these items because they were suggested when I purchased a heavy duty ball hitch. They did not fit the hitch very well and I ended up purchasing a different locking pin for the hitch. The product is a great product and I will keep them for other applications, however, I believe a recommended item should complement the product being purchased not simply related.
What can I say about the locking pins? They fit. Hopefully the locks won't have to prove themselves, but there isn't a lot more to say about them unless someone tries to steal the ball or mount. Then we'll know how good they are at preventing theft.
These locks are great, I ordered more for my adjustable hitch, I've had one for about three years or more. They work great, ( I do put a little oil on them from time to time just to make sure)
Brad
9/7/2021
These types of locks normally dont work. The Curt locks work and still work even now after a year I have not sprayed oil on them, there is no need, they are still in great shape! I highly recommend these locks
Locks look pretty good. Little long for me, made spacers so you can't stick prybar
between lock and hitch and pop off. Easy to lock and unlock. Now I can relax when hitch is on truck and not hooked to trailer.
I'm thinking I probably just got a bad set of these but I have struggled with the locks ever since they were new. The keys don't want to work! Always have to fiddle and jiggle with the locks for an annoyingly long time to get them to work.
Sierra K.
1/15/2022
Perhaps some lubrication is needed for a smooth entry. Next time, if you want to try a barrel key like item # BD580400, they are easier to maneuver in my opinion.
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Good product, fit the 3" hitch on my '15 Chevy2500 with a little room to spare. I'd like to see another 1/4" for the hitch lock, but it did the job well.
I ordered these locking pins for my new ball mount trailer hitch so it wouldn't come up stolen some time. I liked the Master Lock pins better but couldn't get two keyed alike.
Keeps the Curt Adjustable 2-Ball Mount from disappearing...:)
I ordered a hitch and locking pins. All were nicely packaged and delivered very quickly.
Excellent parts and fast delivery. Will buy from again if I need more trailer towing equipment
This is my second set that I have bought my son took over my first set.They are a great asset to my channel hitch.Both locks are keyed alike less keys to carry a round.And like always etrailer comes through with fast shipping and great prices.Thanks again
Great Product , very heavy duty as advertised ! Great Company to deal with .
Dale W.
2/28/2018
great
Exactly what I wanted. Heavy duty and fit perfectly. I installed this by myself in about 2 hours . Hitch, wiring harness and bracket.
Really an amazing outfit. The web page provides all the detail needed to make the right choice on parts so its right the first time. The staff are friendly and caring and the delivery was spot on. etrailer is how web shopping ought to be done. They truly set the standard.
Perfect way to deter a thief from stealing your nice adjustable hitch, the pin for the receiver was long enough to use in my ‘12 2500HD 2-1/2” receiver.
EXCELLENT customer service! I did not like the extension I ordered (totally MY fault). I was able to exchange it for another type extension at no cost. This is a first class company with first class service and first class products.
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Ernesto
1/21/2022
The Locks are working great. Very happy with the product.