CURT Kingpin Lock 23255 Dumbbell-Style Aluminum — Universal 5th-Wheel Trailer Lock, Weather-Resistant

The CURT 23255 Dumbbell Style King Pin Lock is a key-operated aluminum lock that slips over a 5th-wheel kingpin to prevent unauthorized towing.

If you tow an RV, toy hauler or travel trailer, a purpose-built kingpin lock is one of the simplest deterrents against theft. The CURT 23255 is designed to fit most 5th-wheel kingpins and offers a robust, weather-resistant finish so you can leave your trailer parked with greater confidence. It’s made from strong aluminum, operates with a pair of included keys, and uses a compact “dumbbell” form to block the coupling mechanism on the trailer’s kingpin.

How does this kingpin lock stop a trailer from being hooked up?

The lock physically covers the kingpin and prevents the fifth-wheel hitch jaws from closing around it, so a truck can’t couple to the trailer. Because it cannot be rotated or depressed while installed, typical towing procedures are blocked until the lock is removed with its key.

• Slip-on dumbbell shape covers the entire kingpin shaft.
• Prevents hitch jaw engagement and secure coupling.
• Keyed operation ensures removal only by authorized users.
• Two keys included to avoid being locked out.

Will this CURT lock fit my 5th-wheel trailer?

The 23255 uses a universal design intended for the most common 5th-wheel kingpin sizes, so it fits the majority of trailers on the market. Measure your kingpin diameter and compare to product specifications if you have an unusually small or extra-large pin.

• Universal dimensions accommodate standard kingpin diameters.
• Works with most recreational and commercial 5th-wheel trailers.
• Simple install — no tools required for routine use.
• Check compatibility for nonstandard or custom kingpins before buying.

What materials and finishes protect the lock outdoors?

CURT builds the 23255 with a strong aluminum body that resists rust and reduces weight compared with steel alternatives. The lock also features a chrome-plated and powder-coated finish to defend against corrosion, road grime and seasonal weather exposure.

• Durable aluminum body resists corrosion and keeps weight low.
• Chrome plating plus powder coat for added environmental protection.
• Keyed cylinder designed for reliable operation in outdoor conditions.
• Compact construction reduces snagging and interference during storage.

How easy is it to use day to day?

Operation is straightforward: slide the CURT lock over the kingpin and lock it with the provided key. The compact shape makes installation quick and removal just as simple, so it’s practical for everyday use when you park or store your trailer.

• Quick slide-on installation — no tools required.
• Two keys included so you have a spare on hand.
• Compact, portable design fits in storage compartments or a truck toolbox.
• Low-maintenance finish reduces need for frequent upkeep.

Who is this for: The CURT 23255 Dumbbell Style King Pin Lock is for owners of 5th-wheel trailers, RVs, and toy haulers who want a straightforward mechanical deterrent to theft. It suits homeowners storing a trailer, RVers parked at campgrounds, and professionals leaving trailers at job sites who prefer a low-weight, corrosion-resistant locking solution. If you need a simple, rugged kingpin lock with a universal fit and weather-ready finish, this CURT model is designed to provide that everyday security.