Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers

Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers

Item # ML389DAT

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Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers Universal Application Lock ML389DAT
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Product Images

In Use/Installed

Customer Photos


  • Surround Lock
  • Fits 1-7/8 Inch Ball
  • Fits 2 Inch Ball
  • Fits 2-5/16 Inch Ball
  • Master Lock
  • Keyed Unique
  • Universal Application Lock
Keep your trailer safe from towaway theft with this universal coupler lock. Its tough frame fits in and around most 1-7/8", 2", and 2-5/16" ball couplers; and it has a bright red color and heavy-duty construction to deter theft. Lowest Prices for the best trailer coupler locks from Master Lock. Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers part number ML389DAT can be ordered online at etrailer.com or call 800-298-8924 for expert service.


  • All Info
  • Reviews (442)
  • Q & A (49)
  • Videos (2)
  • Photos
  • Why etrailer?

Master Lock Trailer Coupler Locks - ML389DAT

Keep your trailer safe from towaway theft with this universal coupler lock. Its tough frame fits in and around most 1-7/8", 2", and 2-5/16" ball couplers; and it has a bright red color and heavy-duty construction to deter theft.


Features:

  • Heavy-duty coupler lock deters trailer theft by preventing hookup
  • Large size and heavy weight defend against attempts to break or shatter lock
  • Wafer-tumbler lock mechanism resists picking and prying
  • 1-Piece housing slides to fit tightly around your coupler
  • Powder coat resists rust and corrosion
    • Red color provides a visible theft deterrent
  • Keyway cover protects lock from moisture and debris
  • 2 Keys included


Specs:

  • Application: most 1-7/8", 2" and 2-5/16" couplers
    • Fits standard lip, rolled lip, straight lip, surge brake, hammer blow, and UFP couplers
  • Limited lifetime warranty


Note: This product cannot be keyed alike.


Instructions for Locking the Trailer Coupler

  1. Insert key and turn clockwise to unlock.
  2. Pull the ball out from the lock body as far as it will go.
  3. Insert the ball of the lock into your coupler's ball socket.
  4. Push the lock body in so that it surrounds your coupler.
  5. Turn key counterclockwise to lock.


389DAT Master Lock Universal Trailer Coupler Lock - 1-7/8", 2" and 2-5/16"







Video of Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers


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




Video Transcript for Master Lock Trailer Coupler Lock Review

Today, on our trailer, we're going to be taking a look at the Master Lock Trailer Coupler Lock, for 1-7/8", 2", and 2-5/16" Ball Couplers. Part number ML389DAT. Now, with our heavyweight design, that's going to deter against trying to shatter it or bust this lock off of here, and since it's painted red and powder-coated, it's going to resist corrosion and rust, and it's going to be a great deterrent. When somebody sees that you've got this on there, they're not even going to mess with your trailer. It's going to have a wafer-style tumblers. They're going to resist picking and tampering, and it locks into position, and when you take the key out, you know it's secure. Now, we're looking here, at our trailer right here, even if we we're to lock this coupler on the top side from the collar, somebody could come in with a smaller trailer ball, and just slip your trailer on to it, and off they go with your trailer.

Now, with our Master Lock coupler installed, we would just slide it up into place, and we'll push it down, push it back until it's tight against the ball, against the coupler, and we'll lock it. That's not going anywhere. It's secure inside the tongue of the trailer, and you can't put another ball inside there to be able to run off with your trailer; so even if this was locked, it still wouldn't make a difference. This is not going to come out of here, and it's secure. That's going to do it for our look at the Master Lock Trailer Coupler Lock, for 1-7/8", 2", and 2-5/16" Ball Couplers.

Part number ML389DAT.


Customer Reviews

Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers - ML389DAT

Average Customer Rating:  4.8 out of 5 stars   (442 Customer Reviews)

Keep your trailer safe from towaway theft with this universal coupler lock. Its tough frame fits in and around most 1-7/8", 2", and 2-5/16" ball couplers; and it has a bright red color and heavy-duty construction to deter theft.

- ML389DAT
by:

Poor design. With pry bar or chisel and hammer it would be easy to break. If your trailer is worth it, spend a couple hundred and by a heavier lock like AMP. 646633


Comments

If a thief is determined enough, just about any lock can eventually be defeated. Given the price point, this particular lock offers a good level of deterrence. The idea of deterrence is to have the thief see the lock on your piece of equipment, at which point hopefully they will move on elsewhere where the pickings are easier.

-- Mike L - 05/25/2019

55742

- ML389DAT
by:

Fortunately no one has ever tried to pry it off or otherwise remove it, but maybe that's because it's a visible deterrent. I like the ease of application, and the locking mechanism works well. The only minor issue is the color seemed to fade in the hot Texas sunlight pretty quickly. But by all accounts, it's working as it was advertised. 409325



- ML389DAT
by:

So happy to get this product. Simple, easy, and ease of mind having it! 546088



- ML389DAT
by:

love it, it is very heavy duty we have 2, one is used on our boat trailer and the other for an enclosed trailer. feel very safe leaving them parked in the yard when we leave for a weekend. no fading of color, key still works great. recommend to others when ever we can 497282



- ML389DAT
by:

This product works as advertised. 562874



- ML389DAT
by:

Device is better than any other lock I use, I like the design, and the peace of mind of knowing that mr crook won't bother taking my trailer. Thank you 396718


Comments

the Master Lock Trailer Coupler is has been working fine, thank you

Vincent - 08/15/2018

42397

- ML389DAT
by:

Works well I like the fact that it`s easy to connect, fits 1-7/8" ball up to 2-5/16" and protects my trailer peace of mind 538504



- ML389DAT
by:

works well 575431



- ML389DAT
by:

Good and sturdy! Very easy to install, takes about 5 seconds. This lock will deter the honest crook. I am happy with this purchase. 574557



- ML389DAT
by:

My second lock for my other trailer. This is an excellent solid product. It seems like it would be difficult to defeat. I'm sure it can be defeated, but probably not as fast as grabbing my shotgun and racking the slide. 498937



- ML389DAT
by:

I like the ease of use, however it doesnt fit snug. Almost looks like a couple of well placed sledge hammer hits would knock it off. Probably need something else. 554522


Comments

The sad fact is that locks are only for keeping honest people honest. If a thief is determined to steal your trailer, theyre going to get it. The idea is to provide a deterrent, to make the thief expend energy and make noise in order to defeat the lock. Most thieves are opportunistic, if the trailer isnt easy to steal, theres a good chance theyll move on to one thats easier.

-- Mike L - 08/17/2018

42499

- ML389DAT
by:

Held up well through a tough winter. Too bad the paint has faded to a soft pink. Mechanically sound device. Not sure how a slide hammer would fare against the locking mechanism. 431768


Comments

Stll holding strong. Has faded to almost white but I didnt buy it for looks. Gave the locking mechanism a shot of Tri-Flow to keep it working smooth.

Bob H - 09/12/2018

43490

- ML389DAT
by:

im retired from law enforcement and have seen EVERYTHING stolen so this lock is another layer of defense from the bad guy. It works very easily, is strong and with it being red, it is quite a deterrent. 247256



- ML389DAT
by:

My wife said it must work pretty good because we still have the trailer. It's true it does do what it is supposed to. I would have given it 5 stars but the paint on the lock fades pretty fast. 419359



- ML389DAT
by:

Excellent customer service. We ordered two initially and were so impressed ordered two more. Great quality lock for a reasonable price. Delivery in two days as promised. Thank you. 434759



- ML389DAT
by:

The above (new) Master Lock Universal Coupler Lock, is a upgrade to the current coupler lock that I currently have on my 4x6 Utility trailer, also, it will be a lot easier to lock/unlock the new coupler! Thanks! 421801



- ML389DAT
by:

All products arrived on time and were the correct products I ordered. Have not had time to use the items yet, but they will perform as I expect 573881



- ML389DAT
by:

This is just the anti-theft deterrent device we have been looking for. We have an Excavation business and keep a lot of expensive tools and equipment in a 6x12 trailer. We can sleep at night knowing our trailer will still be there in the morning. This thing is very easy to put on and take off. 539334



- ML389DAT
by:

Purchased to secure my new trailer in an unsecured lot. Item easy to use. Good as a short term deterrent but not fully secure. Others on the market that are indestructible, but hey, you get what you pay for. 318238



- ML389DAT
by:

Fits my 2-5/16" hitch. Not particularly heavy duty, I am sure it could be broken off without too much trouble, but has served its purpose and my trailer is still parked where it is supposed to be, so it must work! 519403



- ML389DAT
by:

I feel much better about parking my trailer on the street with this lock on the hitch. Not only does it lock up the hitch securely but the bright red color signals to prospective thieves that this trailer cannot be towed. It is easy to attach and easy to remove. Also very compact so it can be stored easily. The shipping time was less than I expected. etrailer.com is my goto supplier for my trailer accessories. 467210



- ML389DAT
by:

The whole buying and delivery of my trailer was an excellent experience. The pre-purchase questions both my wife and I had were answered and when I picked the trailer up, the USA Trailer employee spent about a half hour going over all the trailer O&M items. In this day in age of lack of customer service, that is really commendable of USA Trailer! Thanks! 564710



- ML389DAT
by:

etrailer always have what I need...excellent products and fast shipping. 573717



- ML389DAT
by:

Looks nice, easy to install ... guess the acid test will be whether or not me rig gets stolen. 575863



- ML389DAT
by:

This is a terrific design since unlike padlocks, can't easily be cut with bolt cutters. I like the bright red color which tells a thief there is a lock to deal with from a distance. I think someone who wants your trailer can probably defeat any system you use, so the goal is to make it tough as possible and I think this lock does that. 287555



- ML389DAT
by:

I just received the coupler lock today so its to soon to write about quality other than it is heavy and seems to be built well. The shipping from etrailer is very quick, paid extra for the three day delivery and it was on time. I've attached it to my 2 5/16" coupler and it fit great. 388082



- ML389DAT
by:

Good product, seems very solid. I like the bright red paint to let everyone know from a distance that the boat trailer is locked. My only complaint is that the paint faded very quickly. 575906



- ML389DAT
by:

We have two vintage trailers. The first one is a 1948 Spartan Manor, we haven't tried the lock on it yet, and the other is a 1958 Aloha which I put the lock on it and it fit like a glove! It was really easy to put on too, so I think it should fit the Spartan just fine also. We got one for each trailer. We like the color for two reasons, one, being red, you can see it clearly, less chance of running into the front of the trailer. Two, it lets thieves know there is a lock on the trailer, and it wont be easy to steal without making a lot of noise. We were pleasantly surprised when the lock came and found it so well made. It's not light or wimpy at all. We're very happy! Thanks for the peace of mind. 238293



- ML389DAT
by:

I received the Master Lock Trailer Coupler Lock that I ordered. It was delivered in just a few days just a it was supposed to. It is exactly what I was looking for. It will help detour anyone from stealing my trailer ! I am extremely happy with the lock and etrailer ! I think this is a great company with great pricing on there products ! I will recommend them to everybody and will be ordering with them again real soon ! It was an easy and excellent experience. Great customer service too ! Thanks etrailer ! 298258



- ML389DAT
by:

Nice lock. It’s nice that there is nothing to really cut on it. Latches on nice and strong. Easy to use. You could even use a default latch lock with it. Hope it holds up as good as it looks. Will review again after awhile. 438163



- ML389DAT
by:

This 'Master Lock' is a great item in added protection for my modified cargo trailer. We all work hard in keeping what is ours' ours. There's always that impulse for those shady individuals out there in breaking a simple lock in taking your hard earned items. This Master Lock looks very durable and notable in given them second thoughts. Thanks' George J. For a quality item' great shipping and packaging. Will highly recommend "etrailer" to new friends I meet on the road. Regards' RG 238081



- ML389DAT
by:

Nice lock and fit my small trailer nicely. It looks like the coating should last as I have the trailer in a coastal region that the last lock (different brand) lasted about a year before the plating was rusted. One of my other boat trailers has a Master lock on it that has been on it for 9 years with no rust, unfortunately that model wouldn't fit the small trailer. 265280



- ML389DAT
by:

I have just gotten product seem ok 553724



- ML389DAT
by:

Got one for insurance purposes. It does go on my boat trailer coupler, but could stand to be a little tighter. Seems just a little loose, although this is my 1st one maybe this is the way their supposed to fit. 395516



- ML389DAT
by:

This lock was chosen by me for medium security of our 20' boat. I was installed easily and will keep most who want to try to steal something like our boat away. If they really wanted to, a sledge would destroy this. Where there's a will there's a way. For our 31' trailer, I opted for another model. That would take a lot more beating to 'maybe' get off the hitch. It also costs about 8 times as much though... 421763


Comments

After one year, taking it off. Our boat is in use again after 1 year, going to Lake Mead. It has held up great, easy to open, and kept thieves away...

Jerome M - 08/17/2018

42495

- ML389DAT
by:

I would've given it 5 stars, except it doesn't fit my trailer. It looks to be a very solid lock. As far as shipping I received it 4 days after ordering, and it was in stock, unlike that other online site. 572093



- ML389DAT
by:

This master lock trailer coupler fits my camper tongue perfectly and is easy to install, remove and store. The red coated steel body is heavy, solid and secures the tongue against thief as stated in the directions. I like the red powder coating for its visibility, as well. The key well is water and dust proof and stands up to those adverse conditions. This is a must for securing any trailer, any where, any time. The price is fair and the lowest I found anywhere. 273905



- ML389DAT
by:

This lock does a good job of denying access to the trailer hitch ball so that the trailer is less easily stolen. However, an inventive thief could still chain to the hitch and tow the trailer away unless the wheels are somehow locked against rotation. This is a good initial safety measure and works well as intended to deny access to the hitch ball. The only issue I have seen is that the cover quickly faded to pink color in the sun and is no longer bright red - only a cosmetic issue. 409492



- ML389DAT
by:

I have installed the lock on my snowmobile trailer which is in a unprotected lot, but could stand to be a little tighter. Seems just a little loose, although this is my 1st one installed maybe this is the way their supposed to fit. I actually bought two as the idea is great. 463520



- ML389DAT
by:

Great product ! 504367



- ML389DAT
by:

With drive off trailer theft going up in our area I had to find a way to protect my cargo trailer that was easy for me to apply and tuff for some would be thief to get past. BINGO this coupler lock is just the ticket, it slips on in a jiff and blocks the coupler from being used. The best part is it’s a Master Lock and tuff as nails. 267141



- ML389DAT
by:

Nice visible extra deterrent to the padlock on the lever. Where as the padlock can be cut with a bolt cutter, this is strong and secure. 658246



- ML389DAT
by:

Nice lock. 655835



- ML389DAT
by:

Works as it should. Bought 3 all different keys that is good. 652903



- ML389DAT
by:

Great product. Exactly as described. Great quality and value. Plus, the shipping was outstanding! eTrailer is a great company and you won't go wrong with them! 644721



- ML389DAT
by:

Simple and easy to install, very well b uilt. 644583



- ML389DAT
by:

Easy company to do business with.. highly recommend! Thank you 642726



- ML389DAT
by:

It looks decent quality and is a visual deterrent 641845



- ML389DAT
by:

It seems like a sturdy lock. 639997



- ML389DAT
by:

Pkg came in on time as stated and in perfect condition and work great. 639838


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Ask the Experts about this Master Lock Trailer Coupler Locks
Do you have a question about this Trailer Coupler Lock?


  • Recommended Trailer Coupler Lock for a 2-5/16
  • I want to start off by saying that any trailer lock that you purchase will never be able to fully secure your trailer from a thief. If they are determined enough to bring equipment with them to remove a lock then given enough time they will be able to remove a lock. This will be the case no matter what you what you are looking to put a lock on. With that being said, the Blaylock EZ Lock Trailer Coupler Lock # BLTL-33 that you referenced is a great lock that has received many great reviews...
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  • Coupler Locks That can be Keyed Alike
  • We have coupler locks that can be keyed alike which are very similar to the MasterLock # ML389DAT, though unfortunately it cannot be keyed alike. The Fastway Universal Trailer Coupler Lock # DT25013KA can though, and like the MasterLock it works with 1-7/8", 2" and 2-5/16" couplers, and A-frame, straight channel, round tongue, flat plate and surge-type couplers. This coupler lock has been rated impressively high by a pretty large sample size of customers, with 311 reviewers leaving an...
    view full answer...

  • Coupler Lock for Titan Brake Actuator With 2-5/16
  • There is a coupler lock for your Titan Brake Actuator # T2477600 with a 2-5/16" ball. The Master Lock # ML389DAT uses a 1-piece housing to fit securely around the coupler, has a powder coat to resist corrosion and comes with a pair of keys. I've added a photo showing how it looks on a Titan coupler and also linked a couple video reviews for you to take a look at.
    view full answer...

  • Comparing Demco and Titan Disc Brake Actuators with Electric Lockouts
  • That is a tough question to answer as both are excellent manufacturers with their respective pros/cons. In regards to brake actuators, they both make and manufacture them here in the U.S.A. and they both come with a one year warranty. In regards to differences, Demco makes a wide range of different trailer and towing products whereas Titan specializes more in trailer brakes. WIth that being said we have had more positive feedback from Titan products in regards to trailer brakes, actuator...
    view full answer...

  • Best Coupler Lock Options for a 2015 Ranger Trail Boat Trailer
  • We have a few different universal options that I recommend choosing from. The Master Lock Trailer Coupler Lock # ML389DAT is a great option because it has a bright red color to draw attention to the fact that there is a lock on the trailer. Since the idea behind a lock is to deter theft, drawing attention to the lock will help to intimidate a would-be trailer thief. One of the most popular options is the Fastway Trailer Coupler Lock # DT25013KA. You can order this lock keyed alike...
    view full answer...

  • Will the Master Lock Coupler Lock # ML389DAT Fit a 4" Wide Trailer Coupler
  • We do have some options for you but the Master Lock Trailer Coupler Lock # ML389DAT that you referenced has a max coupler width of 3-1/4" so your coupler will be a little too big for it. For a coupler lock that can accommodate a 4" wide coupler we have the following: Tow Ready Gorilla Guard - # 63227 Fastway Universal Coupler Lock - # DT25013KA Master Lock Coupler Lock - # 377DAT DeadBolt BLOCKHEAD - # TCL3-YL Out of those options I recommend going with the BLOCKHEAD. It has...
    view full answer...

  • Multiple Trailer Coupler Locks That Can Be Keyed Alike
  • I do have a trailer coupler lock that can be keyed alike but the Master Lock Trailer Coupler Lock part # ML389DAT cannot. Instead you will want to use the Fastway Universal Trailer Coupler Lock part # DT25013KA which can be keyed alike and will work on 1-7/8", 2" and 2-5/16" trailer couplers. This is currently the most cost effective trailer coupler lock we have that can be keyed to match one another. I have attached a review video of the Fastway coupler lock for you as well.
    view full answer...

  • Recommended Trailer Coupler and Trigger Lock
  • If the Fastway Universal Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers - Key 312, # FA86-0015-312, coupler is not snug, it may not be installed correctly. I've attached a video review for you to check out and make sure. If it is installed correctly and still doesn't meet your needs, then I recommend a different style of coupler lock like the Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers, # ML389DAT. You may also be interested in a trigger lock like the Master...
    view full answer...

  • Coupler Lock Recommendations for etrailer Adjustable Channel Mount Coupler # CTA-280
  • You have some options to use a lock on coupler # CTA-280. First, you could use a latch lock, # RC1. Its diameter is slightly less (9/32 inches) than the pin hole diameter for the latch (5/16 inches). Another option is # ML389DAT which works with many styles of couplers and would be a great option for your coupler. I have linked videos of both locks for you.
    view full answer...

  • Recommended Coupler Lock for UFP A-60 Surge Coupler
  • For a UFP A-60 hydraulic actuator/coupler I suggest Fastway coupler lock # DT25013 or Master Lock # 377DAT but the style of lock # ML389DAT will not work with your coupler.
    view full answer...

  • Recplement for the Shelby A-Frame Coupler 5104
  • The best replacement for your Shelby A-Frame Coupler 5104 is the A-Frame Trailer Coupler part # CA-5400-B. The Shelby 5104 fits a standard 50-degree a-frame, has a 13,000 lb weight capacity, and uses a 2-5/16" hitch ball. The A-Frame Trailer Coupler also fits a standard 50-degree a-frame and uses a 2-5/16" hitch ball but has a 14,000 lb weight capacity. In order to install this trailer coupler you will need to cut the old one off and weld the new one on. In order to protect your trailer...
    view full answer...

  • Coupler Lock for 2-5/16" Trailer Coupler Ball
  • We do not have any type of database of parts lists on each year, make and model of trailer so while we cannot tell you what type of coupler you have on your 2005 Airstream there are universal applications that should work. I recommend checking out the Master Lock Trailer Coupler Lock # ML389DAT which will work on your Airstream if you have a standard lip, rolled lip, straight lip, surge brake, hammer blow or UFP couplers. If you take a look at the accompanying photo you can see how...
    view full answer...

  • Replacement Parts for an A-Frame Atwood Trailer Coupler with 2-5/16 Inch Hitch Ball
  • I do have an option for you but we no longer carry the Coupler Repair Kit for Atwood 2-5/16" Yoke Style part 15774. Instead, I recommend replacing the entire coupler for which you can use the A-Frame Trailer Coupler part # CA-5400-B. Atwood was bought out by Lippert and their parts are becoming increasingly harder to find which is why I recommend a replacement coupler. This coupler fits most standard a-frame trailers and will accept a 2-5/16" hitch ball. It also has a black powder coat...
    view full answer...

  • Trailer Coupler Lock for a Coupler with Large Lip
  • You can use Master Lock # ML389DAT for coupler # CTA-280. Another option is to use a latch lock so that the latch cannot be opened. Most latches, if they can accept a lock, will take a 1/4 diameter pin such as # 28012 or # 3008.
    view full answer...

  • Coupler Lock for Vintage Coupler on 1949 Airstream
  • Thank you so much for the photos and for your 2" coupler I recommend the Master Lock Trailer Coupler Lock # ML389DAT. This is a heavy-duty and easy to use coupler lock; you only need to put the ball of the lock into the coupler's ball socket, push the body of the lock in and turn the key. I have added links to a pair of video reviews for you to take a look at as well.
    view full answer...

  • Multiple Locks for a 2-5/16 Inch Coupler that Can Be Keyed Alike
  • Unfortunatley, the Master Lock Trailer Coupler Lock # ML389DAT cannot be keyed alike. But I do have an option that may work for you. The Fastway Universal Coupler Lock # FA86-0015-303 uses the specifc 303 key code and can be ordered in multiple quantities. There a number of options of different key codes available for you to choose from and any will fit a 2-5/16 inch coupler.
    view full answer...

  • Trailer Coupler Lock For Bulldog Coupler
  • When using a bolt-on coupler such as the Bulldog # BD44150WH301, locks such as the Master Lock # ML389DAT help to prevent trailer theft. This product has a 1-Piece housing that slides to fit tightly around your coupler and 2 keys are included.
    view full answer...

  • Coupler Lock and Secuirty for Bolt-On A-Frame Coupler
  • When using a bolt-on coupler such as the Demco # DM14793-52, trailer coupler locks such as the Master Lock # ML389DAT are added to prevent trailer theft. These locks are an inexpensive and large deterrent to those looking to steal a trailer. There is no absolute way to prevent theft of a coupler if somebody was determined enough, but it would be extraordinarily unusual for someone to go through the amount of time, trouble, and risk of unbolting a coupler for the purposes of taking the coupler...
    view full answer...

  • Trailer Coupler and Wheel Locks to Deter Trailer Theft
  • master Lock trailer coupler lock # ML389DAT would be a bit more secure than lock # 377DAT in my opinion because it would be a little more difficult to pry off. When it comes to locks the best solution is redundancy. In other words more than one lock. You may want to consider also adding a wheel lock such as # RA-25 or # WI490. If a thief sees a coupler lock and a wheel lock they are likely going to move on to an easier target.
    view full answer...

  • Construction of Master Lock # ML389DAT Trailer Coupler Lock
  • The Master Lock # ML389DAT is constructed of steel, as opposed to pot metal. Pot metal is an alloy made of non-ferrous metals with low melting points like zinc, lead, copper, tin and aluminum. The lock wouldn't shatter or crack if struck by a hammer, unless extraordinary means like liquid nitrogen were used on the lock first. Although just about any lock can be defeated by a determined criminal if they are motivated enough and have enough time, the rugged construction of the # ML389DAT...
    view full answer...

  • Recommended Coupler Lock that is Keyed Alike
  • I do have a solution for you, however the Master Lock Trailer Coupler Lock # ML389DAT referenced in your question cannot be keyed alike. For a similar option that can be keyed alike, I recommend looking at the Fastway Universal Trailer Coupler Lock # DT25013KA. Like the Master Lock product you were looking at, this coupler lock is compatible with 1-7/8 inch, 2 inch, and 2-5/16 inch couplers. It features an anti-drill pin to discourage attempts to drill out the lock and a bolt-blocked...
    view full answer...

  • Best Universal Trailer Coupler Lock with Keyed Alike Option
  • I do have trailer coupler locks that can be keyed alike no matter how many you purchase but the Master Lock Trailer Coupler Lock part # ML389DAT cannot. For a trailer coupler lock that fits 1-7/8", 2", and 2-5/16" hitch balls and can be keyed alike, I recommend the Fastway Universal Trailer Coupler Lock part # DT25013KA. The Fastway Universal Trailer Coupler Lock is a very versatile device which can fit three different size hitch balls. The tube style locking core makes keys harder to...
    view full answer...


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Info for this part was:

Expert Research:
Michael L
Edited by:
Lindsey S
Expert Research:
Michael H
Expert Research:
Jameson C
Video Edited:
Jacob T
Expert Research:
Adam R
Installed by:
Cole B
Photos by:
Amber A
Updated by:
Danna S
Photos by:
Zach O
Updated by:
Sarah W
Written by:
Alexander C

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