Ball Coupler Lock - Flat Lip Design/standard trailer
Ball Coupler Lock - Inverted/Underslung Design
Discover Our Trailer Coupler Locks
We engineer our trailer coupler locks to fit one coupler design at a time, not every trailer on the road. At AMPLock, each trailer coupler lock is CNC-machined from ductile cast iron and stainless steel, then matched to a specific coupler shape so there's no play for a thief to exploit.
Standard Flat Lip Trailer Coupler Locks
The Flat Lip Design (BRP-2) fits the straight-lip ball couplers found on most utility trailers, boat trailers, and RVs. Pricing starts at $91, and like every lock we build, this trailer coupler lock pairs CNC-machined ductile cast iron with a patented push-and-lock mechanism, so you secure your coupler by hand without reaching for a single tool.
Specialty Trailer Coupler Locks for Non-Standard Couplers
Non-standard couplers need a lock molded to their exact geometry, so we build a dedicated option for each. The No Lip and Square Edge designs run $347, the Rolled Lip Design is $190, and the Adjustable Coupler is $139.99. Owners who also secure a receiver hitch can match these to our hitch locks on a single key, and every specialty design is custom-fit to close the gaps a universal lock leaves open.
Heavy-Duty Trailer Coupler Locks for Commercial Rigs
The Inverted/Underslung Design ($199.99) and the Titan Weld-on Design ($299) handle dump trailers, commercial rigs, and welded coupler setups that standard locks can't reach. Both carry the same ductile iron body and anti-pick disk lock cylinder as the rest of our range, so heavier equipment gets the same custom-fit protection as a weekend utility trailer.
Why Choose AMPLock for Trailer Coupler Locks?
CNC-Machined Custom Fit for Every Coupler Type
Every lock we machine matches a specific coupler profile, so it seats tight against the steel with no slack to pry, shim, or twist. A custom fit does what a one-size lock can't: it removes the leverage points thieves rely on and turns your coupler into a dead end instead of an easy target.
Anti-Pick Disk Lock Cylinder
Our disk lock cylinder uses a rotating face and strategic pin placement to resist picking, and its key system runs millions of unique combinations on controlled blanks. Those blanks aren't sold over the counter, so nobody copies your key without your say-so, which adds protection well beyond the lock body itself.
Free Shipping and 5-Year Warranty
We ship every trailer coupler lock free across the United States and Canada, back it with a 5-year warranty after registration, and stand behind it with a 30-day free return policy. Our keyed-alike system ties any AMPLock product to a single key, so one key can run your coupler lock, hitch lock, and kingpin lock together.
Shop Trailer Coupler Locks at AMPLock Today
Theft doesn't wait for the right coupler, and neither should your protection. Our coupler locks span flat lip, specialty, and heavy-duty designs, each CNC-machined for a fit no universal lock matches and built within our wider lineup of trailer locks on the same hardened materials. Find the design that matches your coupler and lock it down with confidence today.
Frequently Asked Questions About Trailer Coupler Locks
What Coupler Types Do AMPLock Trailer 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 the exact geometry of its coupler type, so you match the lock to your trailer rather than forcing a generic fit.
Are Trailer Coupler Locks Easy to Install Without Tools?
Every coupler lock uses our patented push-and-lock mechanism, so you place it over the coupler, push it into position, and turn the key. There are no wrenches, no drilling, and no loose parts to misplace on the road.
Can Trailer Coupler Locks Be Keyed Alike Across Multiple Locks?
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 bring a new lock onto your current key.
