Trailer Hitch Locks with Keys

COOHAME Trailer Hitch Locks are an adjustable, heavy-duty coupler lock with keyed security that fits 1-7/8", 2" and 2-5/16" ball hitch couplers to prevent unauthorized towing.

If you tow a boat, camper, utility trailer, or RV, protecting the hitch connection is an essential part of securing your trailer. This COOHAME lock combines a visible red finish, an adjustable locking mechanism and robust steel construction so you can lock the coupler quickly and deter opportunistic theft or accidental decoupling while parked or stored.

How does this lock stop someone from hitching to my trailer?

The lock uses a keyed cylinder that clamps over the trailer’s coupler and prevents the ball from seating fully, making it impossible to attach a vehicle without the matching key. The keyed core requires a full turn to open, which reduces accidental openings compared with partial-turn designs.

• Keyed lock core secures the coupler and prevents ball engagement.
• Full-turn mechanism reduces accidental unlocks.
• Bright red finish provides a clear visual theft-deterrent.

Will this fit my hitch size and different trailers?

COOHAME’s latch is adjustable to accommodate the most common ball sizes: 1-7/8", 2", and 2-5/16", making it compatible with many trailers, boats and light RVs. The adjustable design lets you tighten or loosen the clamp to match the coupler profile for a snug, secure fit.

• Universal fit for 1-7/8", 2", and 2-5/16" ball couplers.
• Adjustable rotation mechanism customizes clamping pressure.
• Suitable for boat trailers, utility trailers, campers and RV tongue couplers.

What materials and construction protect against cutting or corrosion?

The lock is built from heavy-duty steel and high-quality aluminum components to resist impact and cutting attempts while keeping weight manageable. Corrosion-resistant finishes reduce rust and help the lock remain functional in wet, salty or outdoor storage environments.

• Heavy-duty steel body provides strength against forced entry.
• Aluminum parts lower weight and resist environmental wear.
• Protective coatings help prevent rust and extend service life.

How easy is it to install and use on a daily basis?

Installation is straightforward and designed for quick on/off use: position the lock over the coupler, rotate the key to set the adjustable clamp, and remove the key. The visible red color also makes it easy to confirm the lock is engaged before leaving the trailer unattended.

• Tool-free installation—fits over coupler and locks with key turn.
• Adjustable clamp can be set with the key for a tight fit.
• Single-pack solution for immediate anti-theft protection.

Who this is for: The COOHAME adjustable trailer hitch coupler lock is best for trailer owners who want a visible, reliable and easy-to-use anti-theft solution that fits the most common ball sizes. It’s ideal for boat owners, weekend campers, landscapers, and anyone who stores trailers in public or unsecured areas and needs an affordable, durable deterrent against unauthorized towing.