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Master Lock Adjustable Trailer Coupler Lock - Stainless Steel

Master Lock Adjustable Trailer Coupler Lock - Stainless Steel

Item # 2847DAT
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Trailer Coupler Locks
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Master Lock 5/8 Inch Span,1 Inch Span,2 Inch Span Trailer Coupler Locks - 2847DAT
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Lock secures most latch-style trailer couplers. Rubber-encased pin tumbler cylinder adjusts incrementally - from 9/16" to 2-3/4" - along notched, 1/4" diameter stainless steel shank. Lowest Prices for the best trailer coupler locks from Master Lock. Master Lock Adjustable Trailer Coupler Lock - Stainless Steel part number 2847DAT can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (64)
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  • Videos (2)
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Master Lock Trailer Coupler Locks - 2847DAT

  • Stainless Steel
  • Latch Lock
  • Master Lock
  • Keyed Unique
  • 5/8 Inch Span
  • 1 Inch Span
  • 2 Inch Span
  • Universal Application Lock

Lock secures most latch-style trailer couplers. Rubber-encased pin tumbler cylinder adjusts incrementally - from 9/16" to 2-3/4" - along notched, 1/4" diameter stainless steel shank.


  • Stainless steel prevents rust and corrosion
  • 4-Pin tumbler lock resists picking
  • Usable length: 3-3/16"
  • 1/4" Diameter pin fits coupler latches with the following widths:
    • 5/8" - Most standard couplers
    • 1" - Most 2-5/16" ball couplers
    • 2" - Most wide latch couplers such as Atwood, Titan, and more
  • Limited lifetime warranty

2847DAT Master Lock Adjustable Trailer Coupler Lock - Stainless Steel

Video of Master Lock Adjustable Trailer Coupler Lock - Stainless Steel

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Master Lock Trailer Coupler Locks - Latch Lock - 2847DAT Review

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.

Customer Reviews

Master Lock Adjustable Trailer Coupler Lock - Stainless Steel - 2847DAT

Average Customer Rating:  4.7 out of 5 stars   (64 Customer Reviews)

Lock secures most latch-style trailer couplers. Rubber-encased pin tumbler cylinder adjusts incrementally - from 9/16" to 2-3/4" - along notched, 1/4" diameter stainless steel shank.


works good good price


The stainless steel feature is nice


It bends because its thin at each locking point

I went out to the warehouse to test a few of these and they seem sturdy and would not bend with bare hands, however, if you do see bending in the lock, perhaps a beefier surround lock will be better for you. Something like item # DT25013KA
Fastway Universal Trailer Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers
will work if your coupler width is smaller than 4.5 inches.
-- Etrailer Expert Sierra K - 12/16/2021


Worked as advertised.


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.


Love this product. The stainless steel is a key feature (no pun intended)

Still kicking
Jimmy W - 06/17/2021


Third timers the charm.


i worked good with my trailer and it fits perfect


Great product. Fits my 2010 Wrangler perfectly. etrailer was the best to deal with. Very personable and quick shipping. Great company.


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!
as described.
Installed easily and seems to be a quality product .
Feels very solid.
Installed on my gearspace 34 cargo carrier.
Great price!


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 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!


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’m a happy customer….Thank you
vann a - 03/16/2018


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 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.


Still working smoothly after a year of use, on both trailers...


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.


I placed the order on a Saturday and it was filled on Sunday, the next day!! I received the order today - Wednesday via UPS. I wish everyone took the same responsibility to provide the utmost in customer service as E-trailer has. When I need any further trailer parts they will be my first and only location I will order from!!



Does exactly what I bought it for. The pin is long enough to go through the hitch and ensures that it doesn't wiggle loose.
This gives me peace of mind, and is more secure than a bolt with a nut on it.


Perfect to replace a lock on Let's Go Aero Gearwagon


Great product at a low price

The stainless steel feature of this lock ensure that time will keep the rust away
Jimmy - 01/28/2021


Although it will only keep the honest folks honest, it gives me a little more piece of mind having this securing the tongue latch on my 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.


Lost the lock portion of the one I had before. Always go straight to for anything I need! Great service, got the item in a week.


This is the second of three security devices we bought last year. It's been everywhere with us from the local beach to northern Vermont. Sturdy and reliable.

Show More Reviews

Ask the Experts about this Master Lock Trailer Coupler Locks

  • What Are the Dimensions of the Master Lock Coupler Lock, Part # 2847DAT
    The pin of the Master Lock Coupler Lock, part # 2847DAT is 4 inches long. The pin has detents that allow it to fit latches up to 2 inches wide. The end cap is constructed of high impact plastic, and there is a metal button underneath that will prevent the pin from passing through the coupler latch if the plastic cap is removed.
    view full answer...
  • What Size Coupler Latches are Compatible with the Master Lock Adjustable Trailer Coupler Lock
    The Master Lock Adjustable Trailer Coupler Lock, # 2847DAT, is designed to fit coupler latch widths from 5/8 inches up to 2 inches wide. In all likelihood, it will fit your coupler. I recommend measuring to make sure. If you get a width that is less than 2 inches and has a hole for a lock that is 1/4 inches or less in diameter, this lock will fit. I have included a link to a video review of this lock for you. I have also included a link to all of the coupler locks we carry.
    view full answer...
  • 5/8 inch Diameter Coupler Lock Recommendation
    Nearly everyone of our coupler locks have a pin diameter of 1/4 inch. The Masterlock Lock part # 2847DAT happens to be 5/8 of an inch in diameter.
    view full answer...
  • How Tight Will Master Lock Universal Trailer Coupler Lock # 379DAT Fit on 2-5/16 Inch Demco Coupler
    The Master Lock Universal Trailer Coupler Lock, part # 379DAT, is designed to work on all three hitch ball sizes, 1-7/8 inch, 2-inch, and 2-5/16 inches. Since it fits all three sizes it will not be able to be very tight, but you will want to make sure to slide the body of the lock up against the coupler as far as possible when attaching the lock to the coupler. As long as the lock cannot be removed after you lock it to the coupler it will work just fine in keeping somebody from connecting...
    view full answer...
  • Can an Additional Latch Lock Keyed to Match Lock Set 3784DAT be Ordered
    We may be able to accommodate you. You would need lock # 2847DAT. To get it keyed the same as lock set # 3784DAT we would physically have to pull the matching one from inventory. There is no guarantee that we will have that number in stock. But in order to start the ball rolling you will need to call customer service at 800-298-8924 and explain that you need # 2847DAT keyed to match the # 3784DAT lock set you already have.
    view full answer...
  • Should Adding a Padlock to a Yoke Style Coupler Keep the Coupler from Coming Off of the Tow Vehicle
    I only had one photo of yours come through so it is a little hard to tell but you should be able to add your padlock style coupler lock, like the Master Lock # 605DAT, to keep your coupler from opening. Attached is a review video of the discontinued Atwood Yoke style coupler AT80072 where you can see that the padlock would attach to. I'm guessing you've already tried attaching the lock and you are still able to open up the coupler with the trailer coupled to your tow vehicle? If that is...
    view full answer...
    Image 1 for
  • Is There a 3/8" Pin for a Coupler Latch Lock
    The pins used in the latch hole on a trailer coupler are not actually holding anything together. They are simply an anti-theft mechanism which stops anyone from being able to open the latch and either uncoupling or coupling the trailer with the pin left installed. I supposed they could also be looked at as a fail safe while out on the road as well. That said, the pins are all 1/4" so I think the manufacturer may have confused that part. I recommend the Master Lock Hitch Receiver and Coupler...
    view full answer...
  • Stainless Steel Trailer Coupler Pin with 1/4 Inch Diameter
    The 1/4 inch diameter snapper pins we have are all regular steel. For a stainless steel 1/4 inch diameter pin take a look at the locking pin # 2847DAT. I have included a link to a video review for you. You will get the stainless steel construction you are after plus the added security of a lock.
    view full answer...
  • Trailer Coupler Lock Solution for Coupler that is 4-5/8 inches Wide
    It looks like would need to get a latch coupler lock like a Master Lock Adjustable Trailer Coupler Lock - Stainless Steel, part # 2847DAT, for your trailer that has a flange width of 4-5/8 inches. I attached a link to a review video of this coupler lock for you to check out. We do not have a surround coupler lock that will be wide enough to fit on a coupler that has a distance of your trailer.
    view full answer...
  • Coupler Lock Recommendation for a Bulldog Cast Coupler # BD4425000317
    I went out to the warehouse and pulled a Bulldog trailer coupler, # BD4425000317, to determine what the best lock for it would be. The best option would be a simple latch lock like # 2847DAT. This will prevent the latch from opening. I have included a link to a video review of the lock for you.
    view full answer...
  • Stainless Steel Trailer Coupler Lock for a Trailer Buddy XR-84 Surge Brake Actuator
    The Master Lock adjustable trailer coupler lock # 2847DAT will work with your Trailer Buddy XR-84 surge brake actuator because it has a 1/4 inch diameter pin. The Trailer Buddy can accommodate coupler locks with diameters of 1/4 and 5/16 inches. It can adjust to accommodate widths of 5/8, 1 or 2 inch couplers. It is also stainless steel per your request. Another style to consider is the trailer coupler lock that codes to early model GM keys. For example, the Bolt coupler lock # BL7025283...
    view full answer...
  • Recommended 3 Inch Locking Hitch Pin For Boatmate Tandem Trailer
    We do have a locking hitch pin that may work very well for you. I recommend the Trailer Coupler Lock, part # e98888. This is a 1/4 inch diameter pin that has a 3-3/8 inch span. This lock has a covered key slot that will help prevent corrosion. I have attached a product review video you can check out. The pin on the Master Lock Coupler Lock, part # 2847DAT you referenced is 4 inches long but is designed to fit latches up to 2 inches wide. It would not work in the 3 inch span you said you need.
    view full answer...
  • Can Master Lock Adjustable Trailer Coupler Locks be Keyed Alike?
    Though we do have many coupler locks which can be keyed alike, unfortunately the Master Lock Adjustable Trailer Coupler Lock, # 2847DAT, is not one of them. There is an adjustable coupler lock which offers plenty of convenience in the BOLT Trailer Coupler Lock, # BL7025289. This lock can be coded to the ignition key of your 2004 Toyota Tundra so you do not have to carry any extra keys. I have added a link to a review of this lock, as well as the link to our page displaying each of our...
    view full answer...
  • Pin or Lock Recommendation for a Yoke Latch Coupler
    It sounds like you are talking about a latch pin which would go through the latch and prevent it from opening. It isn't a necessary part but usually what people do with the latch holes is use a latch lock. I recommend Master Lock Adjustable Trailer Coupler Lock - Stainless Steel Item # 2847DAT because it is adjustable to fit latches with different widths from 5/8 inch wide to 2 inch wide. The pin has a 1/4 inch diameter which is the most common latch hole size. I have linked a video review...
    view full answer...
  • Coupler Lock for 2016 Airstream International
    I reviewed the specs for the Airstream International travel trailers and while they appear to have a standard latch coupler, the one I saw in photos does appear to have a curved lip which could potentially interfere with some coupler locks. No coupler dimensions are provided on the Airstream site. The lock you referenced, Atwood AMPlock Underslung Coupler Lock AT89006, will fit couplers up to 4-5/8-inches wide including the lip. Since you cannot measure your coupler you may prefer using...
    view full answer...
  • Will Masterlock Coupler Lock Fit Demco EZ Latch Surge Actuator
    Yes, since the Masterlock coupler latch lock part # 2847DAT has a 1/4 inch diameter and has a usable span of up to 2-3/4 inches it would fit and work well on the Demco EZ latch style of surge actuator # DM8164311. I attached a review video for this lock for you to check out as well.
    view full answer...
  • Pin Lock for Yoke Style Trailer Coupler
    The Master Lock Adjustable Trailer Coupler Lock # 2847DAT is a great lock to use to lock the yoke style coupler you sent in a picture of. I attached a picture of it used to lock a coupler just like yours for you to check out as well.
    view full answer...
    Image 1 for
  • Replacement Coupler Trigger Latch for 5/16" Diameter Latch Hole
    If you've got a 5/16" diameter hole, those are usually on coupler latches, so it sounds like the Master Lock Adjustable Trailer Coupler Lock - Stainless Steel # 2847DAT is what you're looking for. This lock has a 1/4" pin and is designed for 5/16" latch holes, so it will fit your application. This lock is made from stainless steel so it's not going to rust when exposed to the elements, and the dust cap will keep moisture out of the locking mechanism. I've linked a short video review of...
    view full answer...
  • Trailer Lock Recommendation for Gooseneck Trailer with Atwood Coupler
    Since the Atwood AMPlock gooseneck coupler locks are no longer around your best option for a coupler lock will be a wheel lock to lock the trailer like the wheel lock part # 288-02020. This locks the trailer just as effectively as a coupler lock but is universal enough to fit basically any trailer out there or vehicle. It's the best solution for gooseneck trailers like yours where there isn't a coupler lock that fits the coupler.
    view full answer...
  • Locking Titan Zinc-Plated Straight Tongue Coupler T4853100 to Hitch Ball
    Yes, to secure/lock the Titan Zinc-Plated Straight-Tongue Coupler # T4853100 to the hitch ball you can use a latch lock like the excellent Master Lock # 2847DAT. This will insert through the existing holes on the latch to prevent it from pulling up and unlocking from the ball. It features a 4-Pin tumbler lock that discourages picking and the stainless steel shank will resist any rust or corrosion. I have attached a short video demonstration that you can check out as well.
    view full answer...
  • Can Master Lock Trailer Coupler Locks be Keyed Alike?
    The Master Lock Adjustable Trailer Coupler Lock - Stainless Steel # 2847DAT is not offered in a keyed alike option, so if you order 3 you will have 3 separate keys. If you want locks that are keyed alike, I recommend the Stainless Steel Trailer Coupler Lock - 7/8" Span # e98890 which you can select keyed alike from the drop down box after selecting your quantity desired. I've attached the link to all your keyed alike options.
    view full answer...
  • Need Replacement Keys for Trailer Locks 377DAT and 2487DAT
    It sounds like you have a MasterLock Trailer Coupler Lock # 377DAT and a Master Lock Adjustable Trailer Coupler Lock # 2847DAT . In order to determine which keys you need, you are going to need the number that was stamped on the original keys and not the numbers from the locks. Unfortunately that is the only way to get replacement keys for these two locks. If you wanted to replace them with new locks, you could go with the exact same models as replacements. If you have the numbers off...
    view full answer...
  • Coupler Lock for a Rockwood Signature Ultra Lite Travel Trailer 8312SS
    I did some research on the 2013 Rockwood Signature travel trailers and it looks like the coupler is similar to a Bulldog # BD4425000317 but it was hard to tell from the pictures available on the internet. The Fastway Universal Trailer Coupler Lock, # DT25013KA, should work as long as the outside coupler width at the center of the ball is no greater than 4-1/2 inches. The sides of the Master Lock Universal Trailer Coupler Lock, # 379DAT, could interfere with the construction of the coupler...
    view full answer...
  • Recommended Adjustable Trailer Coupler Lock Set For Use With Most Trailer Couplers and Hitches
    I recommend using the Master Lock Trailer Hitch Receiver Lock and Coupler Lock Set # 3794DAT for securing the Couper # CA-5210-B latch. Included in this lockset is 2 receiver hitch locks for 2" and 1-1/4" receivers as well as the adjustable coupler latch, trailer storage lock and carry bag. All locks are keyed alike to make is easier than fumbling with multiple keys. The Coupler Lock # 2847DAT is if you only want the adjustable coupler lock.
    view full answer...

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