CURT 5/8" Barbell Hitch Lock for 2" Receivers — Black, 2.85" Usable Pin, Watertight Keyed Lock

The CURT 23518 is a 5/8" diameter barbell-style hitch lock that secures 2" receiver ball mounts with a keyed, watertight, powder-coated locking pin.

This barbell hitch lock is built to keep a ball mount or hitch-mounted accessory firmly attached to a 2" hitch receiver and to deter theft by replacing a standard hitch pin and clip with a lockable alternative. Constructed from high-strength steel and finished in black powder coat, the CURT 23518 combines simple operation with weather protection: a 1/4-turn keyed lock mechanism and a watertight dust cap guard internal components from corrosion and debris. Note that the usable pin length is 2.85" and it is not compatible with double-walled receiver tubes.

How does the CURT 23518 prevent trailer or ball mount theft?

This hitch lock replaces a conventional hitch pin by locking into the receiver’s fastener hole, making removal of the ball mount difficult without the correct key. Its barbell shape and visible lock present a clear theft deterrent while the steel construction resists cutting and prying attempts.

• Locks into the receiver’s 5/8" pin hole to block ball mount removal
• Barbell design increases perceived and actual resistance
• Durable steel construction slows forced entry tools
• Keyed 1/4-turn activation prevents accidental release

What size receivers and pins does this hitch lock fit?

The CURT 23518 is engineered for standard 2" x 2" trailer receivers that accept a 5/8" pin diameter. The usable pin length is 2.850", so it fits most single-walled 2" receivers; it will not fit double-walled receiver tubes where internal dimensions differ.

• Pin diameter: 5/8" (0.625") — standard for many tow setups
• Usable pin length: 2.85" — measure your receiver to confirm fit
• Designed for single-walled 2" receivers, not compatible with double-walled
• Works with ball mounts and many hitch-mounted accessories that use a 5/8" pin

How do I operate and maintain the barbell hitch lock?

Operation is straightforward: insert the pin through the receiver and ball mount, seat the end caps, and use the key to turn the locking mechanism a quarter-turn to secure. For longevity, keep the included watertight dust cap installed when not in use and rinse off salt or mud; the powder coat helps resist corrosion but periodic inspection prolongs service life.

• Keyed 1/4-turn lock for quick locking and unlocking
• Includes two keys so you have a spare for emergencies
• Watertight dust cap protects internal lock components
• Powder-coated finish resists rust and road wear

Will this hitch lock work with my towing setup and accessories?

It fits the majority of towing configurations that use a 5/8" hitch pin in a single-walled 2" receiver, making it suitable for ball mounts, bike racks, cargo carriers and other hitch-mounted gear. Verify your receiver wall type and available pin clearance to ensure compatibility.

• Ideal for ball mounts, couplers, and most hitch accessories using a 5/8" pin
• Not recommended for double-walled receivers or oversized pin holes
• Combine with a coupler lock for vehicle- and trailer-side security
• Compact design keeps hitch profile low while locked

Who is this for: The CURT 23518 is aimed at vehicle owners who tow boats, campers, ATVs or cargo and want a robust, simple-to-use locking solution to protect their hitch-mounted equipment. If you need a keyed replacement for a standard pin that offers weather protection, visible deterrence and compatibility with most single-walled 2" receivers, this barbell hitch lock is a practical choice. Measure your receiver’s pin hole and usable clearance before buying to ensure a proper fit.