Model S251 is our most affordable 2-5/16" trailer coupler lock because it slides right over the coupler flange and the lock core is integrated into the lock body. From an "A-frame" welded-on trailer coupler, to a straight bolt-on style trailer coupler, and even some adjustable couplers, the Model S251 fits a wide array of 2-5/16" stamp-formed couplers; and will provide a great level of security! You can key this lock alike to any of your other Proven Locks products.

Designing the best coupler locks is not an easy task. We pride ourselves on producing a "glove like" fit coupler lock. Rest assured that Proven Industries trailer lock products will leave you with simply the best coupler lock on the market. In addition, this lock body is made in the USA!

Cobra 7 (Standard)

The Cobra 7 is a patented key system that was developed for the high-security needs in the vending industries. The COBRA tubular keyway is like no other with its 7 sided tubular keyway, this unique feature stops anyone from going to a hardware store to copy your key. This product offers a high-security solution for those that are looking for excellent exterior performance. COBRA 7 comes standard in all of our products at no additional cost.

Application

The Cobra 7 system is geared for the business owner looking for a great performing lock system at an affordable price with key control.

Proven Disk-Detainer (Upgrade Option)

The Proven Disc Detainer Lock was developed for high-security situations where  minimum maintenance is not possible. This particular lock is virtually impossible to pick due to its rotating disc and requires special lock picks and skills needed in order to pick. 

Application

Disc detainer locks are not all that common in everyday use. Mainly this style of lock is reserved for high-end locks. These lock perform well in extreme weather conditions with minimum if any maintenance.

Medeco M3 (Available upon request, for additional cost)

Medeco comes as one of the oldest High-security lock manufacturers in the USA. You will find this high-security lock in most prisons, government facilities, and even the White House! This particular lock is virtually impossible to pick due to its rotating pins that not only need to be at the right height but the right rotation in order to unlock.

Application

Medeco is typically needed for the high-security needs of companies that need key control or grandmaster key solutions. All parts are machined out of brass and hardened steel, for the combination of great exterior performance and high-security needs.

*Medeco and Abloy is available upon request for an additional fee. Please call customer support for additional information.