CURT 2-5/16 in Trailer Hitch Ball — 20,000 lb GTW, 1-1/4 x 2-3/4 in Shank, Chrome

CURT 40008 is a heavy-duty 2-5/16" chrome trailer hitch ball rated for 20,000 lb gross trailer weight with a 1-1/4" x 2-3/4" shank and hardware included.

This trailer ball is built for demanding towing tasks where strength, fit, and corrosion resistance matter. Forged and heat-treated from steel, finished in a chrome-like nickel-chrome plating, and supplied with a hex nut plus a helical lock washer, it’s engineered to match common Class 5 towing setups. Use this product when your coupler accepts a 2-5/16" ball and your hitch platform and vehicle capacities support the load — always abide by the lowest rated component in your towing system.

How does this ball perform for heavy towing jobs?

The CURT 40008 is designed for high-capacity towing, providing a 20,000 lb gross trailer weight rating when installed correctly on compatible equipment. The hot-forged, heat-treated construction resists deformation under load and the fine thread shank improves clamping strength.

• 20,000 lb gross trailer weight (GTW) rating for heavy trailers
• Hot-forged, heat-treated steel core for added durability
• Fine-thread shank reduces risk of loosening under vibration
• Engineered to meet U.S. VESC-style performance standards

What measurements and fit should I check before buying?

Confirm three measurements for a proper fit: the ball diameter, shank diameter/length, and the mounting platform thickness and hole size of your ball mount. This CURT ball uses a 2-5/16" ball diameter with a 1-1/4" shank and 2-3/4" shank length and requires a platform at least 3/8" thick.

• Ball diameter: 2-5/16" — matches 2-5/16" trailer couplers
• Shank: 1-1/4" diameter by 2-3/4" length to fit common mounts
• Mounting platform: minimum 3/8" thick recommended
• Verify trailer, hitch, and vehicle ratings — never exceed the lowest-rated component

How is the hitch ball installed and secured?

Installation is straightforward but requires correct torque and hardware. The CURT 40008 ships with a zinc-plated hex nut and a helical lock washer; CURT specifies 450 ft-lb torque on the nut to achieve proper clamp force on the shank when mounted to the recommended platform thickness.

• Includes hex nut and helical lock washer for secure mounting
• Specified torque: 450 ft-lb to ensure correct clamping
• Fine threads help maintain holding power after installation
• Inspect and retorque per vehicle and hitch manufacturer guidance

What protection does the finish provide in outdoor use?

The nickel-chrome style plating helps shield the steel core from road grime, moisture, and surface corrosion, extending usable life in exposed towing environments. Proper care and periodic checks will preserve finish and function.

• Chrome-like nickel-chrome plating resists rust and surface wear
• Finish eases cleanup from road salt, dirt, and grime
• Periodic inspection helps detect thread or surface wear early
• Replacement recommended if plating or threads are damaged

Who is this for? The CURT 40008 is aimed at drivers who tow heavy receiver-style trailers such as dump trailers, equipment haulers, large utility trailers, and certain large RV or boat setups where a 2-5/16" ball is required and the trailer, hitch, and vehicle ratings permit up to 20,000 lb GTW. It’s ideal for professional users and experienced recreational haulers who need a rugged, precisely sized hitch ball and who will follow mounting and torque specifications for safe operation.