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  1. Trailer Tongue Lock
  2. Master Lock
  3. Latch Lock
  4. Universal Application Lock
  5. Keyed Unique
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Master Lock Adjustable Trailer Coupler Lock - Stainless Steel

Master Lock Adjustable Trailer Coupler Lock - Stainless Steel

Item # 2847DAT
Retail:$18.83
Our Price: $9.92
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Trailer Tongue Lock
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Shipping Weight: 0.3 lbs
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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. Great Prices for the best trailer tongue lock from Master Lock. Master Lock Adjustable Trailer Coupler Lock - Stainless Steel part number 2847DAT can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (90)
  • Q & A (0)
  • Videos (2)
  • Photos

Master Lock Trailer Tongue Lock - 2847DAT

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


Features:

  • 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 Satisfaction Score:


Customer Reviews

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

Average Customer Rating:  4.7 out of 5 stars   (90 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.

by:

Very pleased tough and looks almost impossible to remove without key.



by:

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.



by:

Great little item does the job. If I had one issue. The key gets stiff to turn I'm not sure if it's going to jam at some point which is a shame because I really like it.



by:

Product is just as described and very reasonable in price. Shipping was also very quick. Thanks!



by:

Called to order another lock because I liked the one so much I had gotten earlier in the week. Customer Service was awesome. Information was gathered by the rep. that helped me with my decision. I'll come back again for all of my trailer needs.



by:

Great lock



by:

Better than nothing . Should slow down the bad guys if they want to try & steal the trailer . They better be faster than the 9MM !



by:

Excellent deterrent for thieves. Works on a multitude of trailers.



by:

Works well for what it is, keeps tongue engaged and provides minor deterrence to thieves, adjustable rungs allow for many widths and configurations to secure tongue lock. I use one on all my trailers which are all a bit different. This one is adaptable.



by:

i worked good with my trailer and it fits perfect



by:

stainless and easy to use



by:

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

Vann A.

3/16/2018

I’m a happy customer….Thank you



by:

great lock



by:

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.



by:

Went the extra mile to find what I need ed!



by:

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.



by:

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!



by:

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!



by:

As usual when dealing with etrailer, everything came in as advertised! Great people to deal with!



by:

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.



by:

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.



by:

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.



by:

great lock



by:

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

Jimmy

6/17/2021

Still kicking



by:

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.


25
90
Show More Reviews

See what our Experts say about this Master Lock Trailer Tongue Lock

  • Trailer Coupler Latch Lock with a 1/4 Inch Diameter Pin Longer than 3/4 Inches
    We have several latch locks that have longer pins you could use. Master Lock Adjustable Trailer Coupler Lock - Stainless Steel Item # 2847DAT has an adjustable span of 9/16" to 2-3/4". Stainless Steel Trailer Coupler Lock # e98890 has a span of 7/8" as does lock # 2878DAT. I have linked videos of these locks for you.
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  • Can You Replace Stock Coupler On A 2023 ATC Raven Car Hauler With Demco Coupler # DM13205-95
    Yes, you will be able to replace your stock coupler with the Demco 50-Degree A-Frame Trailer Coupler # DM13205-95 as long as you have a standard a-frame trailer. I attached a picture below of the dimensions below so you can see if it would work for you. When installing the Demco 50-Degree A-Frame Trailer Coupler # DM13205-95, you will want to use 3/8 inch grade 5 bolts, that are approximately 1-1/2 inches long. Ten bolts will be needed five bolts on each side. For extra security I also...
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  • Are Bolts Necessary to Mount Adjustable Channel Trailer Coupler
    While I completely understand it can be a bit of a pain and more time-consuming than you'd like, I have to recommend you only use the included bolts that come with an adjustable channel trailer coupler such as # CTA-400. Using these bolts (which are grade 8 bolts) ensure the coupler maintains its capacity and stability for the safest towing set up. I know it's not the answer you were looking for but the only option to help prevent theft is to add a lock to the latch, the Master Lock Adjustable...
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  • Do You Have an Alarm For a Manual Parking Brake On a Trailer to Prevent Towing While Engaged?
    While we do not have a buzzer/warning light for the manual parking brakes on your trailer the simplest idea would be to have a tag made you can attach to a Hitch Pin Lock # 2847DAT. Since this will require you to manually lock and unlock the coupler it will serve as a reminder to lock and unlock the parking brake when you connect/disconnect from the trailer. If you were able to find some kind of electronic alarm it will likely drain the battery you will need to install on the trailer while...
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  • Replacement Lock for a GearSpace 34 Enclosed Cargo Carrier
    For your GearSpace 34 Enclosed Cargo Carrier for 2" Hitch # HGK826 you're going to want the Master Lock Adjustable Trailer Coupler Lock - Stainless Steel # 2847DAT.
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  • 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.
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  • 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 etrailer.com 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.
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  • 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...
  • 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...
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  • Trailer Coupler Latch Lock Compatible With 2 Different Tow Vehicles
    The BOLT Trailer Coupler Lock # BL7025290 is going to be programmed to only your 2017 Ford F-250. If you wanted a lock keyed to your 2017 GMC Yukon XL you will need the Lock # BL7025287. You will not be able to use one lock coded to two different vehicle keys. Which leaves you the option of having a separate coupler lock for each vehicle to use or using a Master Lock Adjustable Trailer Coupler Lock # 2847DAT that comes with 2 keys you can leave in each vehicle.
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  • Trailer Coupler Latch Lock with 1 Inch Pin Span
    Master Lock has an adjustable latch lock, # 2847DAT that has presets for either a 1 inch span or a 2 inch span. We also have some that are 7/8 inch spans which is 1/8 of an inch more than a 3/4. We have # e98890, # 2878DAT, and # e98889. I have linked some video reviews of these locks for you.
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  • Pin Style Coupler Lock Recommendation that Requires at 9/16 inch Span
    A snug fit is preferred when picking out a pin style coupler lock for a trailer coupler. If you have 9/16 of an inch from the outer edges of the latch on your coupler I wouldn't recommend going with a 1/2 inch span lock as it would be too short and wouldn't latch. Instead I would go with the Master Lock Coupler Lock part # 2847DAT as it can be adjusted down to a 5/8 inch span and would work well for you. I attached an install video for this lock for you to check out as well.
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  • Trailer Coupler Lock Recommendation for a Bulldog A-Frame Coupler # BD43805W0317
    The Fulton Gorilla Guard coupler locks, like # 63227, fit on couplers that have a lip. That is part of what holds them in place. Since the Bulldog coupler, # BD43805W0317, does not have a lip, it would require a different type of lock. A lock like # FA86-0015-316, would be a good choice. It fits 1-7/8 inch, 2 inch, and 2-5/16 inch couplers. Another options is a lock like # 2847DAT. This type of lock will prevent the latch from moving. I have included a video review of the lock for you.
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  • Comparison of the Deadbolt Coupler Lock and Master Lock Adjustable Coupler Lock
    The main difference between our etrailer.com Coupler Lock, item # e98890, and the Master Lock Adjustable Trailer Coupler Lock - Stainless Steel, item # 2847DAT, is the style of the locks. The Masterlock has the advantage of being able to be used on many different styles of coupler and has a normal style key that can be duplicated at a local hardware store. The Deadbolt has a short span, 7/8 inches, so it can be flush to prevent removal. This style is more compact than the stick and block...
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  • 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.
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  • Coupler Lock With 1/4 Inch Diameter Pin Recommendation
    For our hitch receivers, we offer hitch receiver locks that have either 1/2 inch or 5/8 inch diameter pins. Depending on what you intend to use the locking pin for we do have other options available. We carry locking coupler pins that may work for you. The first lock I recommend is the Master Lock Adjustable Trailer Coupler Lock, part # 2847DAT. This is a 1/4 inch diameter pin that has a keyed lock and is adjustable to fit lengths of 5/8 inch, 1 inch, and 2 inch. Another coupler lock...
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  • Locks for Use with Titan Zinc-Plated Straight-Tongue Coupler T4853100
    Yes, a coupler lock can be used on the Titan Zinc-Plated Straight-Tongue Coupler # T4853100. If you want to secure the trailer when it is not hitched, you can use the etrailer.com Coupler Lock # e98894 or the similar # e98895. Both of these prevent someone from hitching to your coupler. If you prefer a coupler latch lock you can use # 2847DAT from Master Lock. This type of lock works with the trailer coupled or not.
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  • Keyed-Alike Locks Similar to Master Lock Coupler Latch Lock 2847DAT
    We cannot control or select the key code for Master Lock Coupler Latch Lock # 2847DAT but we do have similar latch locks that can be ordered keyed alike although these do cost more than standard locks. Lock # e98888 has a 3-3/8-inch span and # e98886 has a 2-inch span; both can be ordered keyed alike by selecting that option before you add them to your cart. We also have BOLT brand locks that can be coded to use your vehicle's ignition key instead of their own keys. For instance, lock...
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  • Recommended Hitch, Wiring, and Trailer Towing Setup for a 2015 Mazda CX-5
    Good news, I can help make sure you have everything you need to tow your trailer. The Curt Class III hitch # C13315, you were looking at does install easily, but I would recommend the Draw-Tite Class III hitch # 76138 instead. Depending on if your trailer has brakes or not will determine which wiring you will need. Most small utility trailers or jet ski trailers will use a simple 4-way. For lights that are LED or not you will want the wiring harness # 118563. This will power the lights...
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  • Recommended Coupler Lock for Low-Profile Trigger
    For your A-frame coupler similar to the Fulton # FE443050303, I recommend the Trailer Coupler Lock - Deadbolt Style for Surge Brake with 2-1/2" Span # e98887. This lock will allow the ends of the lock to be on either side of the coupler giving you the compatibility with low profile trigger. Another option is the Master Lock Adjustable Trailer Coupler Lock - Stainless Steel # 2847DAT which will allow more of a custom fit.
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  • 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.
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  • Recommended Lock for Demco DM14040-81 Coupler
    The # BLTL-23 Blaylock coupler lock is compatible with a very specific type of coupler, the CollarLok like our part # BD028499, so it wouldn't be a good fit for a coupler like the Demco # DM14040-81. A lock like the # FA86-0015-316 or a latch type lock such as # 2847DAT would be your best fits.
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  • Coupler Lock Recommendations for Atwood Trailer Coupler # 80051
    For trailer coupler 80051 you could use a latch lock such as # e98886 or # 2847DAT. These will install at the latch and prevent it from being able to pull up. Another popular lock for this coupler is # 379DAT. This lock has a part that fits inside the coupler where the ball normally would be. This prevents someone from coupling up to the trailer. I have linked videos for all three of the locks above.
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  • 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...
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