Master Lock Trailer Hitch
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Master Lock Trailer Hitch Security: Built to Protect What You Tow
When you invest in a trailer — whether it hauls a boat, camper, RV, horse trailer, or work equipment — protecting that investment from theft is just as important as the hitch itself. Master Lock has long been one of the most trusted names in security, and their trailer hitch locks bring that same decades-long expertise directly to the towing world. Their lineup is purpose-built to address every vulnerability in the hitch system, from the receiver to the coupler.
Three Layers of Trailer Hitch Protection
Master Lock takes a comprehensive approach to trailer security. Their product range includes hitch locks that replace standard hitch pins with lockable pins for added security, trailer coupler locks that clamp over the hitch ball to prevent your trailer from being detached and towed away, and receiver locks with pins that slide through the hitch receiver and ball mount shank for secure towing.
Understanding which lock you need is key. Hitch pin locks replace standard non-lockable hitch pins to help prevent someone from removing the hitch from your vehicle, while a coupler lock prevents the trailer from being attached to a vehicle, so you can securely leave it at a campsite or jobsite. For full peace of mind, Master Lock also offers combo packs that bundle multiple lock types together, all keyed alike so one key manages your entire hitch security setup.
Signature Technologies & Features
Master Lock's trailer hitch products are distinguished by several proprietary design features engineered for real-world towing conditions. The Push to Lock™ mechanism allows the receiver lock to be secured by simply pushing the lock body firmly onto the pin and removing the key, while the Weather Tough® seal and watertight cap provide additional protection from moisture and dirt. A swivel head design is also available on select models, making access easier on vehicles where trailer wiring limits access to the lock.
Stainless steel receiver lock pins are tapered for easy insertion and offer a Class III/IV rating , making them suitable for heavier towing applications. Extended-length stainless steel models are also available, designed to fit select trucks with heavy-duty tow packages, functioning as both a trailer hitch lock for secure towing and a corrosion-resistant hitch receiver lock for long-term outdoor use.
Universal Fit Across Trailer Types
Master Lock's universal trailer coupler lock is designed to fit 1-7/8 in., 2 in., and most 2-5/16 in. couplers , covering the vast majority of trailers on the road today. Certain receiver lock models fit both 1/2 in. and 5/8 in. receivers , adding further versatility for mixed fleets or households with multiple tow vehicles. Whether you're locking down a utility trailer, a fifth-wheel RV, or a horse trailer, there's a Master Lock solution engineered to fit.
Why Trust Master Lock for Trailer Hitch Security?
Master Lock's towing locks are engineered to resist weather and corrosion, so you can be confident they will last. Advanced locking mechanisms provide resistance to picking and prying — critical features for locks left exposed on a trailer tongue or hitch receiver for extended periods. From a quick overnight stop to a week-long campground stay, Master Lock's trailer hitch products are designed to keep your gear exactly where you left it.