Choosing Best Trailer Coupler Locks with Reviews in The Market

Coupling your trailer to your vehicle is not safe sometimes. While the safety pins and coupler latches are intended for keeping your trailer securely attached to your vehicle, they are not enough to hold. Furthermore, they can be easily undone by anyone. They do not compare to the strength of a coupler lock. Even though there are numerous manufacturers selling high quality, but expensive coupler locks out there, having a trailer coupler lock is equally important because it ensures that our trailers are safe from theft at all times.

** Below, you'll find our more detailed reviews by click in "Reviews" column, but you can also click the links above to see current prices or read customer reviews on

What Is A Trailer Coupler Lock?

A coupler lock is a smaller lock that is designed to add security to your trailer. It ensures that your trailer is tightly fixated on the towing truck. It is used while the trailer is still hooked on the truck.

Coupler locks come in various shapes, sizes and length to ensure that it fits your specific hitch ball size of your trailer. Once your coupler has enveloped the tow ball, you can use coupler locks with keys to secure your trailer.

There are two main types of coupler locks that can be used to secure your trailer. The first one resembles the normal padlock, and you use the keys to lock and unlock it. So once you have hitched your trailer, it locks up the ball and you can turn it through any angle, but it won't come. The second type has locking disks that activate once you fit it on the ball, so you will need to use the key to unlocking the disks.

Trailer coupler locks are manufactured using tough materials that resist rusts, easy cutting and are durable in general. Make sure that you choose the right model, size, and type for your trailer coupler.

Advantages of a Trailer Coupler Lock

The main reason why trailer coupler locks were created was to ensure the safety of trailers. Once you have it installed on your trailer, it keeps it intact, and no matter how hard a thief tries to unhitch your trailer, it will be hard to do so because it always offers a 360 degrees protection. So turning it to a certain angle so that you can remove it won't help you. The presence of a shackle ensures that a thief will have a difficult time trying to pick the lock.

It prevents the coupler latch from loosening when you're driving. A trailer coupler lock will keep your trailer and the tow truck in place in case the hitch fails. A trailer coupler lock contributes to the minimization of swaying or diving off your trailer as you drive.

It holds the coupler strongly so that the hitch does not go over any ball regardless of size.

Trailer coupler locks are easy to install. Once you have it securing the tow ball, you can easily lock it and you are good to go.

Top 5 Best Trailer Coupler Locks with Reviews

Master Lock 377KA Universal Coupler Lock

Master Lock has been manufacturing trailer accessories for many years now, and their products never disappoint because they put quality first before everything. Master Lock designed this coupler lock with safety and security in mind. It has been designed to fit 1-7/8 inch, 2 inch and 2-5/16 inch trailer couplers perfectly. This means that it can fit many trailers so that you can use on your other trailers as well. You do not have to keep buying. This made from China product weighs 2.2 pounds and is made from high-quality material. The lock is chrome coated and resistant to corrosion giving it a durability status. It is further advanced with locking mechanisms to ensure that it cannot be picked either priced. It is also very easy to install and remove.


  • The locking mechanisms are too strong making the lock unable to be picked.
  • It is rust and corrosion resistant.
  • Easy to install and remove.
  • Very cheap.


  • The metal that surrounds the lock cylinder is soft. It can be broken when someone uses force like hammering.
  • It is very subtle to dirt and blowing sand.
  • Has no warranty

AMPLOCK Heavy Duty Trailer Coupler Lock U-BRB2516

The Amplock locks are one of the best products ever produced. The Amplock lock is made with dependability and durability in mind. Weighing 12 pounds, this lock is made with the high-quality material (stainless steel, ducted cast iron 65000 and heat treated steel) to ensure that you get the strongest lock ever. To ensure long-term use of this product, in all climates, the locks are made good rust-free and rust resistant material. It has a simple structure (2 physical parts) and fits perfectly a 2-5/16 inch coupler.

Each lock is made with unique lock system and keys. Each also has a disk based lock with a controlled and identification key system. The coupler locks are made to fit the design of your trailer coupler when unfastened making it a perfect theft preventive.


  • More secure
  • Made of high-quality drill-proof material.
  • Strong and durable
  • Portable


  • Has no warranty.
  • Highly expensive.

AMPLOCK Trailer Coupler Standard Lock

A size 2-5/16 that is easy to operate considering the push and lock system. This heavy lock is better for the price and is made of high-quality material and further treated by e-coat treatment for rust resistance. This lock protects not only your trailer but also your caravan and your boat trailer.

This product is made with features similar to the heavy duty AMPLOCK version, only that it weighs lesser (5 pounds). It is constructed in a way that ensures no pry bars get leverage.


  • Feels and is, quite solid which is an assurance of safety is.
  • The keys are unique hard to duplicate.
  • Very affordable.


  • Has no warranty.

Trimax UMAX100 Premium Universal Coupler Lock

Weighing 4.7 pounds, this lock is can fit more coupler types (1-5/8, 2 and 2-1/3 inches) so that you only need one for all your trailers. It comes with a dual lock ratchet, and the unique design ensures 360 degrees toughened steel guard. The plastic cover over the key hole, which slides up, is to ensure that dirt, grime and moisture do not penetrate. The cover is made of Ballistic grade nylon. This Trimax lock does not have a warranty.


  • The lock looks so strong that a thief would think twice trying to break it.
  • The chrome bar has locking teeth on both sides.
  • The plastic cover is convenient for hiding the key door which in turn prevents dirt, dust, and moisture from getting in.
  • Very affordable.


  • The bar does not close taut over the coupler top.
  • It does not feel solid enough
  • Has no warranty

AMPLOCK U-BRP2516 RV/Trailer Coupler Lock

This lock version of the Amplock Company Is designed for trailers and RV caravan that require a fitting of 2-5/16 inches when unfastened. This lock can also be used wherever as it is made of a rust-free material. The lock is very easy to use, has a push and lock system, which, has control and identification key system. Amplock uses high quality, durable materials for all its locks. This type of U-series lock is quite heavy with a total of 12 pounds, giving the owner a sense of security. Like all the other Amplock locks, it has no warranty, but be sure that your trailer will not be stolen.


  • It is strong and stout and cannot be compromised by any other item to unlock it unless the key that came with it.
  • Very reliable and durable.


  • Quite expensive.


The AMPLOCK locks seem stronger and more reliable when compared to the rest. They come with the push and lock feature and are made of high quality, rust- resistant materials. Their locks cannot be freed by anything other than the designed keys. Furthermore, they are bulletproof. In addition, they have some weight which usually gives the owner some sense of security. The company does not offer a warranty, no guarantees, the locks are quite costly, but you can never be disappointed. The U-BRP2516 seems to be the best of all the other 3. However, the Standard lock is very affordable.

Apart from the lock not fitting as tight, the Trimax Umax 100 trailer coupler lock is also a good choice and far much cheaper. It is also easier to maintain. Besides, it looks stronger and stout to the eyes. It is a good bargain for those who cannot afford the AMPLOCK.

The Master 377KA is very affordable and versatile as it can fit all trailer types. This is also a good fit but would recommend for simple purpose coupling like towing your trailer over small distances.

As a trailer owner, depending on coupler locks to offer 100 percent security to your trailer is not a good idea because they are not efficient and since they are a man-made, they can be picked by thieves who have time and determination.

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