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  • 6 VIDEOS
  • Master Lock Trailer Coupler Lock, Universal Size Fits 1-7/8", 2", and 2-5/16", 389DAT
  • Product Overview VideoAmazon Product Imaging

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

4.7 out of 5 stars (17,421)
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$34.99
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Size: 1 Pack
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About this item

  • Coupler Lock,Universal
  • Bright red finish discourages thief's from messing with your trailer
  • Advanced locking mechanism resists picking and prying
  • Resists rust and corrosion; Simple installation and removal

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Amazon's Choice
4.7 out of 5 stars (426)
$28.79
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Product information

Warranty & Support

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

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Product Description

The Master Lock No. 389DAT features a universal trailer coupler lock, designed to fit most 1-7/8in (48mm), 2in (51mm) and, 2-5/16in (59mm) couplers. The advanced locking mechanism provides resistance to picking and prying. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.

What's in the box

  • Coupler Lock

    • Top Brand: Master Lock

    Highly Rated
    100K+ customers rate items from this brand highly
    Trending
    100K+ orders for this brand in past 3 months
    Low Returns
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    Customer reviews

    4.7 out of 5 stars
    17,421 global ratings

    Customers say

    Customers find this trailer lock to be solid and durable, with one review noting it lasted over three years without corrosion. Moreover, the lock functions better than most hitch locks, is easy to put on and off, and fits most trailer tongues. They appreciate its security features, keeping trailers safe and deterring thieves, while being easy to install and remove.
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    542 customers mention quality, 502 positive, 40 negative
    Customers praise the trailer lock's construction, noting it is made by Master Lock.
    Great product. Exceeded my expectations.Read more
    Good product, fits on the hitch as described and makes it a bit harder for thieves to pull away your trailer.Read more
    Great lock! Makes me feel better knowing that I have this on my utility trailer. I'm sure if somebody really wanted to break this lock they could....Read more
    Better security for the camper--easy to install and remove--good qualityRead more
    511 customers mention functionality, 465 positive, 46 negative
    Customers find that the lock works well and functions better than most hitch locks, with one customer noting it works on all types of trailer couplers.
    This lock has some weight to it. It works great and feels solid. It didn’t fit on my utility trailer but that’s due to my trailer and not this lock....Read more
    This works well and is easy to put on. While it held in place and kept my trailer from possibly being stolen in a quick grab and dash....Read more
    Works as described. Cheap insurance policy for expensive trailer.Read more
    Works perfectly. However, bought 2, came in separate packages. The keys fit both. So, are all the keys the same?...Read more
    405 customers mention ease of use, 388 positive, 17 negative
    Customers find the lock easy to use and lock, noting it's simple to put on and off, with one customer specifically mentioning it works well with any ball hitch.
    Easy to use and its relatively low cost pales in comparison to the huge peace of mind it gives me knowing that no-one can just take off with my RV...Read more
    This very easy to use, heavy duty, trailer hitch lock far exceeded my expectations. Great product for a low price....Read more
    Simple! Effective! High Visibility! Wasn't long after I installed this lock on our cargo trailer that someone tried to take the trailer!...Read more
    ...we bought it to lock our camper up it went on very easy was easy to lock and secured it to keep it safe from being stolen we felt it was a great...Read more
    363 customers mention durability, 270 positive, 93 negative
    Customers find the lock durable, describing it as sturdy and heavy-duty, with one customer noting it lasted over three years without corrosion.
    This is nothing but a visible deterrent to a would be thief. It looks sturdy and feels heavy, but it is pretty obviously die cast metal that a good...Read more
    ...It seems heavy duty and durable, and it's very easy to install, and best of all, it doesn't break the bank. So far, I'm happy with my PurchaseRead more
    Lock is easy to use but not very durable as it is easy to break!Read more
    great trailer lock. Simple an strongRead more
    328 customers mention security, 300 positive, 28 negative
    Customers praise the lock's security features, noting it keeps trailers safe and acts as a deterrent to thieves.
    ...It’s a good deterrent but as far as being the toughest and theft proof. I’d have to say no. Sadly I feel like with any of these locks....Read more
    ...It fits easily, locks securly and is a great deterrent. The color can be scene long way off.Read more
    This little fella provides peace of mind and security to keep my trailer from being towed without my permission. It's light, tough, and easy to use.Read more
    It was simple and safeRead more
    313 customers mention fit, 229 positive, 84 negative
    Customers find that the lock fits well, particularly noting its compatibility with new trailer tongue designs and its ability to accommodate various coupler styles.
    The lock is a heavier grade steel than I expected. It fits well and would be very difficult for a thief to remove.Read more
    Heavy duty, fits perfectly on our new style RV Trailer hitch. Highly recommend.Read more
    used for a 2" bulldog coupler, seems a little loose? but I was very skeptical and bottom line it seems to work....Read more
    ...He tried it on his trailer and fit perfectly! He was so happy. This is a great lock and I was very surprised for the price....Read more
    310 customers mention secureness, 230 positive, 80 negative
    Customers find the lock secure, particularly noting its effectiveness on job sites and how easily it attaches to the trailer tongue, though one customer mentions it can be broken off with a hammer.
    Great lock for the trailer. Fits 2 5/16th trailer just fine. Secure and would be very hard and make a lot of noise to get off if someone tried to...Read more
    Attached to the trailer hitch in seconds and is very secure to keep someone from driving off with your beloved trailer, even when they don’t deserve...Read more
    Works pretty well for my aliner travel trailer pop up. A little loose and wonky to get on, but its more of a visual deterant to make someone think...Read more
    ...It seems heavy duty and durable, and it's very easy to install, and best of all, it doesn't break the bank. So far, I'm happy with my PurchaseRead more
    204 customers mention easy to use, 193 positive, 11 negative
    Customers find the lock easy to use, describing it as simple to put on and remove, with one customer noting it attaches to the trailer hitch in seconds.
    Easy to install on the 2" trailer coupler. Completely disables being able to connect the trailer to a trailer hitch. Lightweight and very effective.Read more
    No one has stolen my RV, so I guess it's working. Easy to put on and easy to remove, seems sturdy, I think the bright red color actually deters...Read more
    Love this product! Easy to install and remove! Protects my Tow Dolly from someone hitching it to their vehicle and driving off. Very pleased!...Read more
    Easy install, easy removal and since it's bright red it's easy to remember to put it on because it looks like something is missing when it isn't...Read more
    Survived 2 theft attempts
    5 out of 5 stars
    Survived 2 theft attempts
    Fantastic lock, survived 2 theft attempts. Ordering more as backups but very happy it held up
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    Top reviews from the United States

    • James
      5 out of 5 stars
      High quality, great price, fits variety of trailer ball szes
      Reviewed in the United States on March 2, 2026
      Size: 1 Pack
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      Master brand is known for high quality, which usually comes with higher price than competitors. Lots of research done to find a very solid lock for new camper trailer. This lock was reasonably priced, in line with other 'foreign'-named options. Lock arrived quickly AND much better theft protection than a lock through the trailer latching mechanism.

      One person found this helpful
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    • Sball
      5 out of 5 stars
      Works well
      Reviewed in the United States on June 7, 2026
      Size: 1 Pack
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      Works and fits well. My trailer has not been stolen yet.

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    • Phillip
      5 out of 5 stars
      Simple and effective
      Reviewed in the United States on April 3, 2026
      Size: 4 Pack
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      Full content visible, double tap to read brief content.

      Easy to install. Fits nearly every trailer coupler. Design is nearly if not entirely bolt cutter proof.

      Sending feedback...
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    • Karen Wood
      4 out of 5 stars
      Trailer lock
      Reviewed in the United States on August 18, 2024
      Size: 1 Pack
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      Full content visible, double tap to read brief content.

      I bought this to go on my travel trailer when it’s in storage. It is well made and went on easily. The lock is made so it will fit all 3 sizes of couplers.

      5 people found this helpful
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    • Kevin
      5 out of 5 stars
      Smooth operator
      Reviewed in the United States on June 4, 2026
      Size: 1 Pack
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      Full content visible, double tap to read brief content.

      Smooth locking mechanism and easy to use. Definitely recommend.

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    • George Crego
      5 out of 5 stars
      Excellent product
      Reviewed in the United States on March 10, 2026
      Size: 1 Pack
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      Full content visible, double tap to read brief content.

      Very sturdy build, very easy to put on and take off. Fast delivery, excellent packaging from a well-known company and the best price out there. Good bang for the buck.

      Sending feedback...
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    • David
      5 out of 5 stars
      More of a visual security feature
      Reviewed in the United States on June 5, 2026
      Size: 1 Pack
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      Works pretty well for my aliner travel trailer pop up. A little loose and wonky to get on, but its more of a visual deterant to make someone think twice than an extraordinary lock tight security feature for me and I accept that.

      Sending feedback...
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    • Irv
      5 out of 5 stars
      Survived 2 theft attempts
      Reviewed in the United States on April 27, 2026
      Size: 1 Pack
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      Fantastic lock, survived 2 theft attempts. Ordering more as backups but very happy it held up

      Survived 2 theft attempts
      Irv
      5 out of 5 stars
      Survived 2 theft attempts
      Reviewed in the United States on April 27, 2026
      Size: 1 Pack

      Fantastic lock, survived 2 theft attempts. Ordering more as backups but very happy it held up

      Sending feedback...
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    Top reviews from other countries

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    • Katrina Murphy
      5 out of 5 stars
      Great quality
      Reviewed in Canada on November 30, 2020
      Size: 2 Pack
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      Full content visible, double tap to read brief content.

      I purchased these because of the great price on a two-pack and am comparing them against my typical brand, Reese. The locks are easy to use, great quality and seemingly a good alternative. We have yet to have cold weather, so it's yet to be seen if these freeze.

      Sending feedback...
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    • Zsolt Dobra
      5 out of 5 stars
      Nice to have
      Reviewed in Germany on March 19, 2026
      Size: 1 Pack
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      Nothing serious, it is working well. Fits to my AL-KO head.

      Sending feedback...
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    • RENE
      5 out of 5 stars
      Excelente candado para remolque
      Reviewed in Mexico on September 27, 2025
      Size: 1 Pack
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      Full content visible, double tap to read brief content.

      Excelente producto

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    • norm roy
      5 out of 5 stars
      Good
      Reviewed in Canada on December 1, 2024
      Size: 3 Pack
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      Trailer fermé

      Sending feedback...
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    • Djack
      5 out of 5 stars
      Dissuasion
      Reviewed in France on November 22, 2025
      Size: 1 Pack
      Brief content visible, double tap to read full content.
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      Fait le tafff.

      Très bonne dissuasion.

      De bonne fabrication.

      Oui je recommande.

      Sending feedback...
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    See more reviews

    Product Summary: Master Lock Trailer Coupler Lock, Universal Size Fits 1-7/8", 2", and 2-5/16", 389DAT

    From Master Lock

    4.7 out of 5 stars, 17,421 ratings

    Customer reviews

    50+ bought in past week

    Price

    One-time purchase: $34.99

    Purchasing options

    Other sellers

    Other sellers

    About this Item

    • Coupler Lock,Universal
    • Bright red finish discourages thief's from messing with your trailer
    • Advanced locking mechanism resists picking and prying
    • Resists rust and corrosion; Simple installation and removal

    Product Description

    The Master Lock No. 389DAT features a universal trailer coupler lock, designed to fit most 1-7/8in (48mm), 2in (51mm) and, 2-5/16in (59mm) couplers. The advanced locking mechanism provides resistance to picking and prying. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.

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