Master Lock Trailer Hitch Lock
Why Master Lock Is a Trusted Name in Trailer Hitch Security
When it comes to protecting your trailer, boat, camper, or ATV from theft, few names carry the weight of Master Lock. Founded in 1921, Master Lock has spent over a century engineering security solutions that people depend on every day — and their lineup of trailer hitch locks is no exception. Whether you're hauling a horse trailer cross-country or leaving your utility trailer parked at a job site overnight, Master Lock offers purpose-built products designed to keep your equipment exactly where you left it.
Two Core Solutions: Coupler Locks and Receiver Hitch Locks
Master Lock approaches trailer security from two distinct angles, and understanding the difference helps you choose the right product for your setup.
- Trailer Coupler Locks — These fit over the coupler itself to prevent anyone from hitching your trailer to a different vehicle. Master Lock's universal coupler locks, such as the 379DAT and 389DAT models, are 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. The advanced locking mechanism on these models is engineered to resist both picking and prying.
- Receiver Hitch Locks — These replace the standard hitch pin in your receiver to prevent ball mounts and drawbars from being removed. Master Lock's swivel head receiver locks, like the 2866DAT, are built with a push-to-lock convenience feature and a swivel head design that's especially useful on vehicles where trailer wiring limits access to the lock. Models are available in stainless steel for maximum corrosion resistance and are rated for 1/2 in. and 5/8 in. receivers.
Built to Withstand the Elements
Trailer locks live outside — exposed to rain, road salt, UV rays, and temperature swings. Master Lock addresses this directly by engineering their towing locks to resist weather and corrosion. Key features found across the lineup include covered key slots that prevent moisture from entering the locking mechanism, solid brass lock cylinders for corrosion resistance, and stainless steel construction on premium models. These details matter when you need a lock to work reliably after months or years of outdoor exposure.
Keyed-Alike Convenience
For owners who want to simplify their key ring, Master Lock offers receiver lock and coupler lock combo kits that are keyed alike — meaning one key operates both locks. This is a practical advantage for frequent towers who may be managing multiple security points on a single rig.
Choosing the Right Master Lock Trailer Hitch Lock
Selecting the right lock starts with identifying what you're trying to prevent. If your goal is to stop someone from stealing your trailer by hitching it to their truck, a coupler lock is the right tool. If you want to prevent your ball mount or receiver from being removed, a receiver hitch lock is the better choice. It's also important to verify that the lock you select matches your hitch receiver diameter and that its weight class rating meets or exceeds your gross trailer weight. Master Lock's product lineup spans a range of sizes and configurations to match everything from lightweight utility trailers to heavy-duty Class III and Class IV towing setups.
Browse the full selection of trailer hitch locks or explore the complete Master Lock product catalog to find the right security solution for your towing needs.