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Finding a lock that fits different trailer couplers can be a hassle. The Master Lock Adjustable Trailer Coupler Lock solves this with its adjustable pin tumbler cylinder that adapts to a wide range of latch-style trailer couplers. With incremental adjustments from 9/16" to 2-3/4", its 1/4" diameter stainless steel shank ensures it secures most standard couplers; whether you're dealing with a 5/8", 1", or 2" span, this lock adjusts to your needs seamlessly.
Worried about rust and the elements weakening your lock? The stainless steel construction of the Master Lock Coupler Lock provides exceptional resistance to rust and corrosion. This durability is not just about longevity; it's about reliable security that withstands the test of time and weather, offering peace of mind in all conditions.
Concerned about lock picking? The 4-Pin tumbler design of this coupler lock resists tampering, providing a robust safeguard against unauthorized access. Its design acts as a deterrent for potential thieves, ensuring your trailer remains secure whether it's parked at a campsite or stored in a driveway.
Dealing with different trailer types and need one lock for all? This lock is perfect for a myriad of trailers, fitting coupler latches of many popular brands, including Atwood and Titan. The compatibility ensures that whether it's an A-frame trailer, a gearwagon, or a wide latch coupler, the lock will function without a hitch.
Achieving a snug fit is crucial for towing security. The notched design along the shank of the Master Lock Coupler Lock ensures a precise fit that keeps the lock firmly in place, preventing any wiggle or looseness. It's engineered to give you the confidence that once it's on, your trailer is securely coupled and ready for the road ahead.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Demo-master-lock-locks-2847dat Today were doing a review of the Master Lock Adjustable Trailer Lock part number 2837 DAT. This lock comes with all stainless steel parts to prevent rust and corrosion. The pin has a built in notches to walk around the barrel lock. The pin diameter is a quarter inch. It will fit the 5/8 standard couplers and from one inch to 2-5/16 ball couplers. The lock works like this; simple take our pin, run it through our coupler latch and we will take the barrel lock and slide it on.
Well lock it into position, remove one of our two keys and put our cover over the barrel lock. And there you have it for the Stainless Steel Master Lock Adjustable Trailer Coupler lock part number 2847 DAT.
The lock is protecting my trailer. Great Product.
Good Product, fast shipping, everything I expected.
There are cheap ones out there, this is not one of them. I like the quality of the locking mechanism.
Was a bit skeptical at first on how buff this would be but after seeing it in person very solid. Fits my 1 inch lock perfect.
Much better than my previous lock. Better Security and fits a lager variety of trailers.
The locking mechanism is stiff and the key is very difficult to get in all the way. This might get better with usage. Overall, good product to use on any kind of trailer.
Hitch lock works great. I wish it could have been keyed the same as my receiver lock pin...but that wasn't an option.
Bought this because it was within the size requirements for my intended use as a lock for our new EV charge port. Fit well, just had to modify the pin due to being just about a 1/4" too short.
I bought this to replace one i lost. I have one just like this on another trailer.This is an excellent coupler lock it can be used on all the trailers i have.
It works. Great service from eTrailer.
Ease of ordering. Good communication. Prompt delivery.
great product this is my second one. I left the other one sit on my bumper by mistake...things always come quick and easy from etrailer.
Ordered product for my Tab Travel Trailer and it turned out I ordered the wrong item They gladly refunded the mistake and sent my the right one. I had called and they guided me to the correct product. Very happy...vann
I purchased this lock for a way to keep people honest while my trailer was attached to my truck . Knowing the lock is cheap and Master Lock brand, disappointingly the lock itself traps moisture inside even with the cap closed and facing downwards - a bit of silicone around the cap would help. Because of the moisture, it’s has corroded a bit inside making the key almost impossible to insert. I’ve had to soak the lock with WD40 to help the key go in. It still mostly works but I wouldn’t recommend it. The problem is there’s not many cheap alternatives to lock the latch while your trailer is attached to your vehicle. Skip this and find another option.
I usually store my Anderson hitch drawbar in the coupler. I had a Bulldog installed on my Airstream (well worth the $500 it cost). I use this lock when among friends to prevent them from dropping the Anderson on a foot if they are curious about the Bulldog. This lock would not deter a thief.
The lock worked very well. It fit perfectly into the existing hitch pin hole. The variable length on the lock shaft allowed me to snug up the lock to the hitch mechanism which I think will make it more difficult for any thief to cut or remove the lock. The key operation was simple and easy. I use the lock pin when my trailer is attached to my vehicle and also when it is not attached so as to serve as a secondary trailer coupler lock and not allow the coupler to be opened for thieves to insert their ball hitch and steal the trailer and boat. Great product.
Easy ordering process!
Fast shipping!
Product as described.
Installed easily and seems to be a quality product .
Feels very solid.
Installed on my gearspace 34 cargo carrier.
Great price!
I don't rate this product very high since the Master Lock assembly is poorly built. I believe it would not take a thief long to break the lock and just pull the pin out. The lock is even hard to operate with the key. Not recommended
I am using this product with the coupler lock I purchased. I am thinking if its worth the hassle to send it back.
I purchased a pin type trailer coupler lock and a ball type coupler lock. Both work well and were easy to install. Of the many products available from etrailer, it was easy to find what I needed. It was shipped the same day as ordered and arrived quickly. As a first time customer, I am very pleased with the results. I will shop at etrailer.com for future needs and wants. As a matter of fact, I had a product question quickly answered by etrailer experts and ordered the suggested item today. I give etrailer 5 1/2 stars!
Johnathon was my sales rep that I dealt with when I had questions. He was great and he kept track of my order and when the trailer hitch was not available from the manufacturer until late March, he helped me choose another one and sent it to me with the freight free of charge. It took only two days to arrive and I am very happy with the hitch and wiring harness. Highly recommend.
Very pleased tough and looks almost impossible to remove without key.
I believe it will be functional as it is advertised, but I does not appear to be as well build as most Master Lock products have purchase before. I does fit my trailer hitch that is was ordered for.
Love this product. The stainless steel is a key feature (no pun intended)
Jimmy 
6/17/2021
Still kicking
Had to drill out the whole in the trailer latch to make this product fit
It is exactly what I wanted. Now my trailer is safe from theft and uncoupling.
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Vann A.
3/16/2018
I’m a happy customer….Thank you