Fortress™ Coupler Lock

• Universal Fit: Works with virtually every  1-7/8”, 2”, or 2-5/16” coupler style, so you can be confident it will fit your trailer.
• Maximum Security: Hardened steel housing resists cutting, prying, and drilling, making it very difficult for a thief to steal your trailer.
• Weatherproof Protection: Dust cover shields the lock core from dirt, debris, and ice.
• Corrosion Resistant: Rust-resistant finish ensures long-term durability in all climates.
• Easy to Use: Installs in seconds—adjust, lock, and walk away with confidence that your trailer is safe.
• Designed and Engineered in the USA: Developed with precision and tested for real-world durability, and perfect fit on hundreds of couplers.

Locking your trailer coupler is the best way to keep your trailer safe. A coupler lock protects your trailer by making it difficult for a thief to hook up your trailer to their vehicle. The Fastway® FORTRESS™ helps keep your trailer secure. It is the toughest coupler lock available, made from the highest corrosion resistant material and fits virtually every coupler style. In fact, after years of testing, we haven’t found a coupler it doesn’t fit. The lock has a hinged cover, protecting it from dirt, debris, rust, water, and ice. With its thick housing, incredible strength, and a lock that’s very difficult to pick, the FORTRESS deters theft, providing peace of mind and trailer security.

Locking and unlocking the FORTRESS is quick and easy with a front-facing key hole so there isn’t anything to reach around to turn the key. The lock cylinder is smooth, making it an easy key turn.

The Fastway® FORTRESS™ Coupler Lock is the toughest, most universal trailer lock you’ll ever need. Built from hardened steel and tested against every major coupler design, the FORTRESS™ provides unbeatable protection from theft and tampering. Its thick housing and precision-engineered locking core make it virtually pick-proof, while the corrosion-resistant finish and dust cover keep it performing smoothly through rain, snow, and sun. Whether at home, on the jobsite, or on the open road, the FORTRESS™ delivers the ultimate peace of mind for your trailer’s security.