CURT 23521 Trailer Coupler Lock 1/4" 🔒

This compact coupler lock from CURT keeps your trailer tongue secured with a simple latch-style mechanism that fits common 1/4-inch pin holes and spans up to 3/4 inch. It offers quick installation and a visible deterrent for short-term parking and storage, making it practical for tow trailers, utility carts, and small equipment trailers.

Key Points

The lock uses a latch-type design that is easy to handle and engages with a smooth 1/4-turn action for fast locking and unlocking. It includes two keys for convenience and has a protective black finish that helps resist surface wear and corrosion. The locking pin is made of hardened steel to increase resistance to cutting and prying. 🔒

This model is compact and meant for straightforward security at the coupler rather than long-term theft prevention against determined tools. Consider that it secures the coupler latch and may not prevent all removal methods according to the manufacturer.

Technical Specifications

• Name: CURT 23521
• Pin diameter: 1/4 inch
• Usable span: Up to 3/4 inch
• Finish: Black protective coating
• Key quantity: Two keys included

Usage Recommendations

Use the lock on couplers with a compatible latch hole and within the stated 3/4-inch span to ensure proper engagement. For everyday use, install the pin through the latch while the coupler is in the closed position, then rotate to engage the 1/4-turn activation. The 1/4-turn activation keeps operation quick when coupling and uncoupling at boat ramps or storage lots. ⚓

Store the spare key separately from the trailer to avoid accidental lockouts. Periodic lubrication of the locking mechanism will help maintain smooth operation, especially in coastal or wet environments. If the trailer is left unattended for extended periods in high-risk areas, complement this lock with additional security measures because a single coupler lock primarily deters casual tampering rather than determined theft.