CURT Trailer Tongue Coupler Lock — Chrome Barbell Style, 1/4" Pin, Fits Up to 3-3/8" Span

CURT 23523 is a chrome-plated barbell-style coupler lock that secures latch-type trailer tongues with a 1/4" pin and up to a 3-3/8" span.

If you rely on a safety pin or coupler latch alone, you leave your trailer more exposed than necessary. The CURT 23523 coupler lock is engineered to lock the latch mechanism in place rather than simply retaining it, creating a stronger deterrent against tampering and opportunistic theft when your trailer is attached to a vehicle.

How does the CURT 23523 improve trailer security?

Instead of only keeping the latch closed, this lock inserts through the latch assembly and locks into a fixed position so the coupler cannot be opened without the key. Its barbell design protects the pin from direct manipulation while chrome plating helps resist corrosion from road and weather exposure.

• Barbell-style construction shields the pin from tampering.
• Key-operated cylinder secures the latch closed.
• Chrome finish increases corrosion resistance and longevity.

Will this coupler lock fit my trailer's latch?

The CURT 23523 is made for common latch-type couplers. It accepts a pin with a 1/4" diameter and fits coupler latch spans up to 3-3/8", so it covers many small-to-medium trailers, boat trailers, and utility trailers.

• Pin diameter: 1/4" (0.25 inches).
• Maximum usable span: up to 3-3/8" between latch points.
• Designed specifically for latch-style couplers; not for ball-mount locks.

How does it perform in daily use and bad weather?

Operation is straightforward: a simple 1/4-turn locks and unlocks the unit for fast, repeatable use. An included watertight dust cap helps keep internal components dry, and the chrome finish protects exterior surfaces from rust and road grime.

• 1/4-turn lock activation for quick securing and removal.
• Watertight dust cap shields the keyway from moisture and debris.
• Durable chrome plating reduces corrosion and eases cleaning.

What comes in the box and how do I manage keys?

CURT includes two keys with each 23523 lock so you can keep a spare accessible without compromising on security. The compact design stores easily in a glove box or toolkit when not in use.

• Two identical keys included for convenience and backup.
• Compact barbell size for easy storage when unlocked.
• Simple installation—no special tools required beyond your hands.

Who is this for: The CURT 23523 coupler lock is for trailer owners who want a stronger mechanical deterrent than a standard safety pin—ideal for boat owners, weekend campers, landscapers, and anyone towing utility trailers who needs reliable, low-fuss protection while the trailer is coupled. It’s best for latch-style couplers within the 1/4" pin and 3-3/8" span specifications and for users who prefer a keyed, weather-protected solution with a visible, tamper-resistant profile.