CURT 2-5/16-Inch Trailer Hitch Ball 30,000 lb Raw Steel, 1-1/4" Shank, Hot-Forged Strength

CURT 40085 is a heavy-duty 2-5/16-inch raw steel trailer hitch ball rated for up to 30,000 pounds gross trailer weight.

Built for demanding towing tasks, this CURT trailer ball combines hot-forged construction, heat treatment and a raw-steel finish to deliver the strength and wear resistance required by Class 5 towing setups. It is engineered to fit standard 2-5/16" couplers and secures to a ball mount with a 1-1/4" shank and supplied fastening hardware. All components are tested to U.S. VESC specifications to meet industry safety expectations.

Will this ball fit my 2-5/16" coupler and hitch mount?

The CURT 40085 uses a 2-5/16" diameter sphere to match most 2-5/16" trailer couplers and a 1-1/4" shank that secures into common Class 5 ball mounts. The shank length and thread spec are chosen to ensure a solid mechanical connection when installed correctly.

• Ball diameter: 2-5/16" for standard coupler fit
• Shank diameter: 1-1/4" to fit Class 5 mounts
• Shank length: 2-5/8" to accommodate mount thickness
• Fine threads with included zinc-plated hex nut and helical lock washer

How strong and durable is the CURT 40085 for heavy towing?

This hitch ball is made by hot forging and then heat treating the steel to improve toughness and wear resistance for high-stress towing. It is rated for up to 30,000 pounds gross trailer weight when used with towing components that meet or exceed the same capacity.

• Gross trailer weight rating: 30,000 lb
• Hot-forged steel construction for high strength
• Heat-treated material for improved wear resistance
• Raw steel finish balances durability with industrial toughness

What hardware and installation details should I know?

The CURT 40085 ships with the fastening hardware needed for a secure installation: a zinc-plated hex nut and a helical lock washer. Fine threads and the specified torque ensure the shank is held tightly to the ball mount; installation must follow the torque recommendation for safe towing.

• Included: zinc-plated hex nut and helical lock washer
• Thread type: fine threads for enhanced holding power
• Required torque: 450 lb-ft to properly seat the ball
• Rise/drop: 0" (straight ball geometry)

Is this hitch ball safety-tested and are there towing limits?

CURT tests this ball to U.S. VESC specifications to confirm performance under expected towing loads. Always respect the lowest rated component in your towing system — the vehicle, hitch, ball mount, and trailer each set limits that must not be exceeded.

• Meets U.S. VESC testing standards
• Rated capacity applies only when all towing components are rated accordingly
• Regular inspection for wear, corrosion or thread damage is recommended
• Do not exceed the lowest rated towing component

Who is this for: The CURT 40085 is aimed at professional and serious recreational haulers who use Class 5 receiver systems — operators of dump trailers, heavy equipment haulers, dual-axle utility trailers, large RVs, or similar high-capacity rigs. It’s a fit when you need a straightforward, industrial-grade 2-5/16" tow ball with proven testing and robust fastening hardware; choose it only if your vehicle and hitch are rated for comparable loads.