Trailer Coupler Locks Built for Your Coupler

At AMPLock, we don't build one trailer coupler lock and call it universal. Every trailer coupler lock in our range is CNC-machined from ductile cast iron and stainless steel, then shaped to match a single coupler profile so a thief is left with no slack to work with. Whether your trailer rides on a standard flat lip coupler, a no lip or square edge design, a rolled lip, an adjustable head, or a heavy welded setup, there is a lock here cut to fit it.

Flat Lip Coupler Locks for Standard Trailers

The Flat Lip Design (BRP-2) is made for the straight-lip ball couplers you will find on most utility trailers, boat trailers and RVs across Canada. It carries the same CNC-machined ductile cast iron build as the rest of our line, paired with a patented push-and-lock mechanism that secures the coupler by hand, with no tools required.

Locks for Specialty and Non-Standard Couplers

Couplers that stray from the standard shape need a lock moulded to their exact geometry, so we make a dedicated option for each one. The No Lip and Square Edge models, the Rolled Lip Design and the Adjustable Coupler each seal the openings a one-size lock leaves behind. If you also lock down a receiver, you can run these on the same key as our hitch locks.

Heavy-Duty Coupler Locks for Commercial Trailers

For dump trailers, commercial rigs and welded coupler configurations that standard locks can't reach, the Inverted/Underslung Design and the Titan Weld-on Design step in. Both share the ductile iron body and anti-pick disk lock cylinder used across our range, so heavier equipment gets the same custom fit as a weekend utility trailer.

What Sets AMPLock Coupler Locks Apart

A Custom Fit for Every Coupler Profile

Each lock we machine is cut to a specific coupler shape, so it sits flush against the steel with no gap to pry, shim or twist. That tight custom fit strips away the leverage points thieves count on and leaves your coupler with nothing to grab.

Anti-Pick Disk Lock Cylinder

Our disk lock cylinder turns on a rotating face with carefully placed pins that shrug off picking attempts, and its keys run through millions of unique combinations on controlled blanks. Those blanks stay off store shelves, so no one duplicates your key without your go-ahead.

Free Shipping and a 5-Year Warranty

We ship every coupler lock free across Canada and the United States, back it with a 5-year warranty once you register, and give you 30 days to return it at no cost. Our keyed-alike system ties any AMPLock product to one key, so a single key can run your coupler lock, hitch lock and kingpin lock together.

Lock Down Your Coupler with AMPLock

Theft never waits for the right coupler, so neither should you. Our coupler locks span flat lip, specialty and heavy-duty designs, each CNC-machined for a fit no universal lock can match and built alongside our wider line-up of trailer locks on the same hardened materials. Match the design to your coupler and lock it down today.

Trailer Coupler Lock FAQs

Which Couplers Do AMPLock Coupler Locks Fit?

We build coupler locks for flat lip, no lip, square edge, rolled lip, adjustable, inverted or underslung, and titan weld-on (Bulldog style) couplers. Each one is CNC-machined to its coupler's exact geometry, so you match the lock to your trailer instead of forcing a generic fit.

Can I Install a Coupler Lock Without Tools?

Yes. Every coupler lock relies on our patented push-and-lock mechanism: set it over the coupler, push it home and turn the key. There is no drilling, no wrenches and no loose parts to lose on the road.

Can Multiple Locks Share One Key?

Our keyed-alike system lets you match any AMPLock coupler lock to the same key as your other AMPLock products. Choose the keyed-alike option at checkout and enter your existing key number to add the new lock to your current key.