Master Lock Trailer Lock, Black Trailer Tongue Lock 379ATPY

The Master Lock 379ATPY universal trailer hitch lock is a straightforward, effective security solution that does exactly what it’s meant to do. If you’re looking for an easy way to secure a trailer without overthinking the setup, this lock delivers dependable protection with minimal hassle. Fit and compatibility are strong points. The universal design works well across different types of trailers, including RVs, utility trailers, horse trailers, and tool trailers. It fits securely over the coupler and blocks it effectively, preventing anyone from hitching up and towing off your trailer. Once installed, it’s very clear the trailer isn’t going anywhere. Build quality feels solid. The lock has a good weight to it and doesn’t feel thin or easily defeated. While no lock is completely theft-proof, this one is sturdy enough to act as a strong deterrent. It sends a clear message that the trailer is protected and not an easy target, which is often half the battle when it comes to theft prevention. Installation is quick and simple. You don’t need tools or complicated adjustments. It slides into place easily and locks securely. Removing it is just as easy when you’re ready to use the trailer, which makes it convenient for regular use without becoming annoying. The locking mechanism works smoothly. The key turns cleanly without sticking, and the lock opens and closes without feeling gritty or cheap. That’s important for something that may sit outdoors and be exposed to weather. So far, it’s held up well without signs of binding or corrosion. The black finish keeps it discreet while still looking tough and purposeful. It doesn’t draw unnecessary attention, but it’s obvious enough to let would-be thieves know the trailer is secured. It also looks clean and professional, whether the trailer is parked at home, a storage lot, or a campsite. Overall, this Master Lock trailer coupler lock is a reliable, easy-to-use security accessory that does its job well. Strong fit, solid construction, simple operation, and broad compatibility make it a smart choice for protecting trailers of all kinds. If you want added peace of mind without complexity, this is an easy five-star product.

Item was just received and was as described. Easy to use and secure once in place.

I needed some locks for heavy-duty trailers that use 2-5/16" Bulldog couplers. I had previously had bad luck with Guardian locks, which were more expensive, not as well made, and not backed up by the manufacturer. These Master Lock coupler locks not only appear to be much better than the Guardian locks, they come with a limited lifetime warranty from Master. This lock fits the 2-5/16" Bulldog/Hammerblow couplers (in spite of the fact that this size is not listed) and is a very reasonable price. Fortunately, I cannot say how well they resist thieves' attempts to steal the trailer, but they will certainly provide a substantial deterrent. I bought mine in October 2008 and they have a chrome finish that appears to be excellent. Despite being in the weather all winter in Indiana, they still look and operate as if they were brand new. It looks like Master Lock has switched to the pictured painted or powdercoated finish instead of the chrome plating. I don't know how well the new finish will protect the mechanism compared to my chrome ones, but keep in mind that Master Lock offers a lifetime warranty, which covers operation but not finish. I have never had any trouble installing the lock to the coupler, but I agree that it can be a bit loose when locked. The lock attaches via a number of notches and it's unlikely that you'll find one that is exactly tight. There's no ratchet to help you with this, so you must squeeze the locking mechanism as you turn the key. It's more trouble to write about it than to do it. In spite of the slight looseness, I think someone would have a tough time getting it off the coupler. Regarding sticking tumblers or locking mechanism, I find that I must lubricate all my locks, including these, occasionally. Amazon also sells Master Lock model 379DAT, which has a rubberized coating. I bought one of those recently. It seems to be a bit looser on the coupler, I think because of the coating. Unless you are concerned about the possibility of the coupler's paint chipping from metal-to-metal contact, I would recommend the model 379ATPY over the 379DAT. See Painter Bill's review, dated July 11, 2011. Both of these locks are highly recommended, but especially the 379ATPY.

Simple device, easy to install. Works well as a deterrent.

This is the best trailer lock for me since i have 3 different ball size units and it works on all of them. A rugged construction and it looks like it will hold up to severe weather conditions.

Every time we’re heading out for a camping trip in our RV, this lock gives me extra peace of mind. I bought it after one too many Facebook stories about stolen trailers. Snapping it on just takes a second, even with my toddler asking for snacks while I do it. The two keys are handy—I keep one hidden in the kitchen drawer. Not having to stress about theft while the kids are running around is such a relief. 🚐

Taking two little ones to the park with our camper, I needed something that would make me feel safer when we step away for a while. This lock fits snug on our trailer, and using the key is quick. I liked how sturdy it feels and the black color doesn’t look too obvious. Happy I found this after seeing it on Instagram. 🛻🔒

Fits perfectly on a 25’ Continental tandem boat trailer with a Demco coupler on a 2” ball.

Great lock and works as should. 2 keys come with unit as well for extra security.

Great product

Wirkt massiv und passt auf alle gängigen Hänger Habe mich letzten Endes aber entschlossen es zurück zu schicken. Anwendung kann von mir also nicht bewertet werden.

Bastante práctico de usar y te da más tranquilidad de los distintos tipos de candados para cople este es mi favorito

Livraison rapide, produit durable. Nous avons tester le masterlock avec une masse, nous avons littéralement frapper à plusieurs reprises et c'est impossible à briser. Non seulement il n'a pas briser mais il n'y a aucun dommage. Semble s'adapter pour plusieurs type de remorque. Je le recommande.