Menu Icon
fall hauling headquarters

Price: $24.11

In Stock

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

Item # ML389DAT

lowest price pledge

Retail:$30.16

Our Price: $24.11

Trailer Coupler Locks

Orders above $99 qualify for Free Shipping

Shipping Weight: 3 lbs

Quantity: 

In Stock
Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers Universal Application Lock ML389DAT
zoom in icon
zoom out icon
pop out icon replay 360 icon
horizontal rotate icon

Product Images

spin image icon
Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers Universal Application Lock ML389DAT
ML389DAT - Keyed Unique Master Lock Trailer Coupler Locks
Master Lock Trailer Coupler Locks - ML389DAT
Master Lock Trailer Coupler Locks - ML389DAT
Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers Keyed Unique ML389DAT
Master Lock Keyed Unique Trailer Coupler Locks - ML389DAT
ML389DAT - Keyed Unique Master Lock Trailer Coupler Locks
Trailer Coupler Locks ML389DAT - Universal Application Lock - Master Lock
Master Lock Surround Lock - ML389DAT
Master Lock Surround Lock - ML389DAT
ML389DAT - Universal Application Lock Master Lock Surround Lock
Master Lock Trailer Coupler Locks - ML389DAT
Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers Universal Application Lock ML389DAT

In Use/Installed

Trailer Coupler Locks ML389DAT - Keyed Unique - Master Lock
Master Lock Surround Lock - ML389DAT
Trailer Coupler Locks ML389DAT - Universal Application Lock - Master Lock
Master Lock Universal Application Lock Trailer Coupler Locks - ML389DAT
Master Lock Surround Lock - ML389DAT

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 (343)
  • Q & A (41)
  • 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 Locks ML389DAT Review

Today we're going to be taking a look at the Master Lock trailer coupler lock. This is a universal lock that's designed to fit most 1 and 7/8th inch, 2 inch, and 2 and 5/16th inch ball couplers. This is a heavy duty coupler lock that's going to deter trailer theft by preventing hookup. It's got a nice large size to it as well as the heavy weight. So it's going to defend against attempts to break or shatter the lock. It's going to use a wafer tumbler lock mechanism.

That's going to resist picking and prying. It's also hard to duplicate keys that would fit a wafer tumbler lock mechanism. The key hole right here is easily accessible. We're looking at a one-piece housing. This portion right here is going to be the portion that slides to fit tightly inside the coupler. I'll explain it just a little bit here.

Towards the end of the video, I'm actually going to show you how to install it on a coupler. So you want it in the open position. This is going to fit into the socket of the coupler. Then once you have it installed, you push these 2 pieces together. That's going to create the nice tight fit.

This is the one piece housing so that's going to slide to fit around the coupler and provide that nice tight secure fit that we need to make sure that it's all the way secured and to fully prevent trailer hookup. We're looking at a powder coated steel construction. It's going to do a great job at resisting rust and corrosion and lasting a long time. The red color is going to provide a visible theft deterrent, so in most cases, when a thief sees a lock installed, they don't even bother with it. So this is red in color and it's easily visible, and it lets people know right away that your trailer is hooked up and they're not going to go anywhere with it. So it's a really nice design. Over the key slot, we're going to have a key way cover.

That's going to protect the lock from moisture and debris. You're going to get 2 keys with a part number, and you're going to get one trailer coupler lock. Again this is designed to fit most 1 and 7/8th inch, 2 inch, and 2 and 5/16th inch couplers. It's going to fit standard lip, rolled lip, straight lip, surge break, hammer blow, and UFP couplers. With a maximum coupler width of 3 and one quarter of an inch. So be sure that the coupler width does not exceed that measurement. This is covered with a limited lifetime warranty. Now when installing this, it's a very simple installation. You want to make sure this is in the unlocked or open position. Place it into the socket on the coupler. I'm going to go and close the latch on mine. These 2 pieces slide together. Then I simply move it to a locked position. Then it's not going to go anywhere. It's fully secured and installed. Now you can see that it will rotate like that. But that does not give it any space to come off of the actual socket area. Removing it is also very simple. Place the key back in the key slot. Move it to the unlocked position. Pull it away, and it's going to drop right out. That's going to do it for today's look at the Master Lock trailer coupler lock.


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   (343 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:


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:


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:


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:


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:


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:


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:


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:


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:


I ordered multiple items, Trailer Wheel Covers, Trailer Tie Downs, Trailer Tire Chocks, Trailer Ball Lock and Wench Recovery Kit. Everything was delivered as expected. The entire team was courteous and very communicative with items which were back ordered.They waived shipping on the back ordered items, while allow me to add to the second shipment. Thanks for the awesome consumer experience. I will definitely be ordering from you guys soon!!! 399269



- ML389DAT

by:


Our travel trailer is stored near a busy highway, and we were looking for something that would make it difficult for somebody to hook up and take off with our trailer. This fits the bill perfectly! Very simple to use, but heavy enough to make sure that it's not coming off easily. Very happy with this purchase! As usualy, etrailer shipped promptly and did a great job of communicating the status of the order and shipment. 487917



- 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 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:


This trailer locking device is heavy duty, well constructed, and coated to protect any painted surfaces. This improves the security of my boat trailer when not in use. Using a regular lock through the trailer tongue clamp down hasp is not a sure way to secure the trailer when the ball receiver is still is exposed, and can still be used with a smaller ball, etc. This Master Lock device solves that problem. 460674



- ML389DAT

by:


etrailer.com rocks!!! Ordered this item and needed it in 2 days in order to take on my trip. I messed up the address on my order, and was concerned it would not get here in time. etrailer.com automatically fixed my error, and I received it in 2 days. You guys are so efficient. Great service, great product! You guys should be running Washington. We need competency there in the worst way. 274389



- 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:


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:


Works. No one has tried to steal the trailer and failed so it is essentially un-tested. However it feels substantial and the red color lets you know it's there. Does not work with the coupler latch down, not a problem, but if you also have coupler latch lock it negates the effectiveness of that lock. So you won't really be able to double lock it. 513281



- 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:


We received 10" of snow so I have not tried this on the trailer yet, but I have a new unused coupler that it fit perfect I will be ordering more of these for myself as these are Christmas gifts. Sierra H. was easy to work with and was very concerned that I got the correct product. Thanks to her and etrailer !! Happy Holidays to all!! 323028



- ML389DAT

by:


Have used these before and they are excellent. Easy to use, compact and provide good security. My older one is chrome and I hope this color (red) is as durable as the chrome. Was glad to find them at ETrailer, ordering was easy and quick and the product arrived within 5 days. Will recommend this product and ETRAILER to my friends. 422181



- 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:


A determined thief will defeat just about any kind of locking device. That being said, even the most aggressive thief will have a hard time with this product. Compared to the other types that use softer materials, this thing is built like a tank. This locking device inspires a lot more confidence than the one it will be replacing. 405570



- 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:


Great device. I have historically used a couple of other coupler locks over the years and this is the best yet. Was a little skeptical when I ordered it as I have multiple trailers with multiple hitches but this one fit all three I tried last night - an more snugly than the other "yellow" brand I normally default to 301755



- ML389DAT

by:


Had bought another type of lock for my concession stand trailer but it would fall right off. Did a google search and found This awesome lock! The video is what sold me! excited when it arrived and fit like a glove! Perfect lock and perfect fit! The lock was delivered fast and was able to secure my property safely! 389277



- ML389DAT

by:


This should deter most anyone that want to try and break it. Fits nice and works well. In the end there are two bolts holding on the coupler so if someone was really determined they could remove the coupler. I'm very happy with this and the bright color that should deter all but the most determined thief. 399963



- ML389DAT

by:


Trailer lock arrived, & installed on my boat trailer just as etrailer said it would. I wasn't in a hurry & used the standard shipping which got the lock to me in just a few days. etrailer shipped the same day as the order. Looks like a solid lock, & the red color makes it very easy to spot. 422272



- ML389DAT

by:


I have master locks on my cargo trailer and so I knew master lock was the brand I wanted. After watching the video of this master lock trailer lock I knew it was what I was wanting. I received it in just a few days and the quality fit and finish are as expected. Thanks you etrailer.com 518257



- ML389DAT

by:


My contact via email with customer service department was a pleseant surprise as they responded quickly and was very helpful. I received the 2 items that were ordered for our travel trailer in a very timely manner. I will definitely use etrailer again for any of my trailer needs. 405919



- 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:


I have had a trailer stolen with the ball latch locked open so when I saw this hitch lock I bought it to try. No one has been able to get by it yet. And the nice thing is it really does secure multiple size hitches without extra parts or fuss. The price was very reasonable too! 466111



- 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:


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:


Very heavy cast iron construction paired with it's practical design make this the exact product we were looking for to secure our travel trailer while in storage. I prefer this over a competitor's product because I feel the design makes it harder to remove by a thief. 294548



- ML389DAT

by:


Must be working as a deterent to trailer theft as I still have my trailer. Easy to lock on and off. Only issue I see is my trailer is parked in the sun only 6 months of the year, but the bright red paint faded quickly....only an issue if you care about looks! ;) 548030



- ML389DAT

by:


Looks good. Nice shinny high visibility finish. Might present enough of a hassle for a thief to cause them to move on to an easier target. Probably won't repel a determined hammer assault for long though, my opinion only. But certainly better than nothing. 528755



- ML389DAT

by:


I ordered the trailer locks on line about 7pm. Got an email saying it was out of stock. Few minutes later got a phone call from etrailer saying they would ship it as soon as they come in stock. I thought that was great follow up and customer service. 462161



- ML389DAT

by:


I’m very happy with this lock. It’s heavy but still easy to use and lock into place. For my trailer a thief would bend or brake the hitch before getting this lock off. Also the ETRAILER company is great to work with, knowledgeable and friendly. 453033



- ML389DAT

by:


Thanks for making the order process easy to understand and complete. The delivery was made in a fast and the product was exactly what I needed, ordered and wanted. Thank you and I will definitely order additional products from your company. 337288



- ML389DAT

by:


This product works as advertised. 562874



- ML389DAT

by:


We bought several accessories for our new Winnebago at etrailer. As always the products were good quality and the delivery was very fast. etrailer is my preferred dealer for trailer parts and accessories. Great service and follow up. 473465



- ML389DAT

by:


The trailer lock I ordered came as noted. Very pleased with the fit on my dump trailer. I feel safe with that on now. I only gave it 4 stars because no one has tryed to break it off yet and and not sure if they can. Very Pleased 458436



- ML389DAT

by:


This lock is very easy to use. Will fit all your standard ball sizes. And looks like it would be very difficult to defeat. I just got this so I can't speak to the longevity or how it handles winter weather but so far so good. 461544



- ML389DAT

by:


I received the lock in a couple days. etrailer ships fast! The product is as stated and looks like it'll protect my Coachmen travel trailer from easy theft for a long time. Never had an issue with anything from these people. 519952



- 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:


A nice and heavy product. I see no way how anyone could defeat this lock quietly where I park my trailers. I like the bright red color that lets crooks know that they are going to have to deal with a lock right away. 492873



- ML389DAT

by:


Easy to use and fits many size trailer hitches. Our camper was too small for a lock so we opted for this product. Works great while in storage or at the camp site while we are away with our vehicle. I highly recommend! 488222



- ML389DAT

by:


So far so good ,easy to put on and I think this is a great deterrent to would be thieves . Of course if they really want your trailer they will get it ,but this will stop and make them think twice . I would buy again . 407287



- ML389DAT

by:


Great product ! 504367


54
347
Show More Reviews

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


  • Parts to Prepare 2011 Honda Pilot to Tow Travel Trailer Through Rocky Mountains
  • Your 2011 Honda Pilot that will be towing your new camper trailer through mountainous terrain in the Rockies will certainly benefit from some performance enhancements. A simple friction anti-sway bar like # 83660 can help with crosswinds and air blasts from passing trucks. These are inexpensive and simple to install; their tension is also adjustable. You just need to use a 2-inch bracket # RP26003 on your ball mount to provide a mounting point for the included ball. Note that this type...
    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...

  • 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...

  • 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...

  • 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...
    view full answer...

  • 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 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...

  • Construction of Master Lock # ML389DAT Coupler Lock
  • The Master Lock # ML389DAT trailer coupler lock is constructed of powder coated steel. If you click the provided link, you can see a product demonstration video. As you can see by its rating, the folks who've purchased the lock are happy with it.
    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...

  • Material of the Master Lock Coupler Lock part # ML389DAT
  • The Master Lock Coupler Lock part # ML389DAT that you referenced is made of steel. It is basically the red powder coated version of the older Master Lock 379ATPY.
    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...

  • 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...

  • Would the Master Lock Trailer Coupler Lock # ML389DAT Fit an Interstate Cargo Trailer
  • I looked up some pictures of the couplers that are on Interstate cargo trailers and the Master Lock Trailer Coupler Lock # ML389DAT that you referenced would fit the couplers and would work well. I attached a review video for this lock for you to check out as well.
    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...

  • 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...

  • Locks for A-Frame Trailer Coupler
  • We have all sort of trailer locks including coupler locks for a-frame trailer couplers. Please refer to the linked page that displays all standard coupler locks. You can use a universal-fit surround-type lock such as # ML389DAT which fits all ball sizes and that prevents someone from hitching to your trailer by clocking access to the coupler, or a simple latch type lock like # RC6 that prevents the coupler latch (like the one on # CA-5400-B) from being lifted to unlock the coupler.
    view full answer...

  • Trailer Coupler Lock for 1-7/8, 2, and 2-5/16 Inch Couplers that Can be Keyed Alike
  • Unfortunately, the two locks you asked about cannot be ordered keyed alike or rekeyed but I do have some options for you. We have some trailer coupler locks that can be ordered in multiple quantities and keyed alike and will fit a 1-7/8, 2, and 2-5/16 inch couplers. The Blaylock EZ Lock Trailer Coupler Lock # BLTL-33-40D is one. It uses a heavy-duty bracket that fits around the coupler. Another option is the Fastway Universal Coupler Lock # FA86-0015-312 which is ordered with the...
    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...

  • 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...

  • Key Replacement for ML389 DAT
  • You would need the part # MLK1. On the product page you would then need to enter the key number you need and we will ship you out the correct key.
    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...

  • 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...

  • 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...


Do you have a question about this Trailer Coupler Lock?




  • Why etrailer.com?

    At etrailer.com we guarantee:

  • Highest quality trailer coupler locks for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate trailer coupler lock information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Satisfaction Guarantee
    Need to return an item? No problem. Please read our Returns Policy for more information.

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

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.



Product Experts Available Now!

Call 800-298-8924


^
About Us
photos and videos
1,056,204

Original Photos & Videos

Produced to make sure you know what you are getting and you get exactly what you need.

installations
35,570

Installations Completed

To make sure products work and fit the way they are supposed to.

etrailer call center
2,476,511

Phone Calls & Emails Answered

1,125,924 phone calls and 1,350,587 emails to help find the right solution.

etrailer training
400+

Average Hours of Product Training

We get to know our products firsthand so experts can better help you.

etrailer service
71

Years of Quality Customer Service

Assisting our neighbors and customers, face to face at the counter.

etrailer experts
193,357

Pages of Expert Information

Created to make sure you have all the answers to your questions, from real experts.