CURT 2-5/16" Chrome Trailer Ball — 1" Shank, 6,000 lb VESC-Tested Tow Ball

Designed for demanding towing tasks, the CURT 40021 delivers a combination of forged-steel strength, a protective chrome finish, and a precise shank fit. It installs on standard ball mounts with a 1-inch diameter shank and is engineered to meet U.S. VESC standards so you get a dependable connection between your vehicle and trailer. Always observe the lowest rated component in your towing system — vehicle, hitch, ball mount, or trailer — when determining safe towing limits.

How does this tow ball handle heavy loads?

The CURT 40021 is forged from hot steel and rated for 6,000 pounds gross trailer weight, giving it the structural integrity needed for many class 5 towing setups. Its construction and testing focus on resisting deformation and maintaining a secure ball-to-coupler fit under load.

• Rated gross trailer weight: 6,000 lb
• Hot-forged steel body for load resilience
• Tested to U.S. VESC specifications for validated performance

Will this ball fit my hitch and coupler?

This ball has a 2-5/16-inch diameter to match standard 2-5/16-inch couplers and a 1-inch shank diameter that inserts into most ball mounts. The 3-inch shank length and fine threads, along with the included hex nut and helical lock washer, create a secure attachment when torqued properly.

• Ball diameter: 2-5/16 inches — fits compatible couplers
• Shank: 1" diameter, 3" length for stable mounting
• Includes zinc-plated hex nut and helical lock washer for secure install (250 lb-ft torque required)

How does the finish protect the tow ball outdoors?

The CURT 40021 features a nickel-chrome plating that shields the steel surface from moisture, dirt, and road grime. This finish slows corrosion and keeps the ball surface smoother, which helps coupler engagement and reduces wear on trailer components.

• Nickel-chrome finish for corrosion resistance
• Smoother surface reduces friction and wear at the coupling point
• Durable plating helps extend service life in outdoor use

What safety and installation points should I know?

Curt recommends following torque specifications and inspecting all towing components before each trip. The fine threads and included hardware are designed for a tight hold, but correct assembly and component-matched ratings are essential for safe towing.

• Torque nut to 250 lb-ft for secure fastening
• Verify the lowest-rated component for the system’s maximum safe tow weight
• Inspect threads, nut, and coupler before each trip for wear or damage

Who is this for? The CURT 40021 is aimed at motorists and professionals who tow medium-to-heavy trailers — such as dump trailers, toy haulers, dual-axle utility rigs, larger campers, and small watercraft — and need a rugged, tested tow ball that pairs with class 5 systems. If you require reliable, VESC-tested hardware and a corrosion-resistant finish for frequent or heavy towing, this tow ball is built to meet those expectations while fitting standard 2-5/16-inch couplers.