CURT 2-5/16" Chrome Trailer Ball 40005 — 7,500 lb Capacity, Nickel-Chrome Finish

CURT's 2-5/16-inch chrome trailer ball (model 40005) is a heavy-duty tow ball engineered to handle up to 7,500 pounds for secure receiver-style towing.

Built for drivers who pull heavier loads, the CURT 40005 combines hot-forged steel construction with a nickel-chrome finish and precise shank dimensions so it fits standard 2-5/16" couplers and mounts. Designed, tested, and finished for durability, this tow ball balances rugged strength with corrosion resistance to stay dependable across seasons and road conditions.

How does this trailer ball match with my hitch and coupler?

The CURT 40005 is sized to mate with couplers made for a 2-5/16" ball, and its 1" diameter, 2-1/8" shank is compatible with common class 5 ball mounts. Always verify the lowest-rated component in your towing setup — vehicle, hitch, mount, or coupler — before towing. Installation requires proper torque to secure the ball and prevent loosening under load.

• Ball diameter: 2-5/16" to fit standard 2-5/16" couplers
• Shank: 1" diameter, 2-1/8" length for secure mounting
• Torque spec: 250 lb-ft recommended for final tightening
• Includes: zinc-plated hex nut and helical lock washer for secure fit

What towing capacity and safety standards does this ball meet?

This model is rated for a 7,500 lb gross trailer weight and is manufactured to meet U.S. VESC specifications, reflecting industry testing for strength and reliability. The rating assumes the rest of the towing system (hitch, vehicle, trailer) supports that weight. For safe operation, choose components rated at or above the intended load and follow routine inspections.

• Gross trailer weight rating: 7,500 lb
• Manufactured from hot-forged steel for consistent strength
• Tested to U.S. VESC standards for performance verification
• Use only with appropriately rated hitch, mount, vehicle, and coupler

How does the finish and hardware protect against corrosion?

The CURT 40005 uses a nickel-chrome plating that shields the ball from moisture, road salts, and abrasive grime, slowing corrosion and maintaining a smooth mating surface. It ships with a zinc-plated hex nut and helical lock washer to resist rust at the attachment point and to preserve a firm mechanical connection through changing conditions.

• Nickel-chrome finish for long-lasting surface protection
• Zinc-plated hex nut included to combat rust at the fastener
• Helical lock washer prevents loosening from vibration
• Smooth plated ball surface helps maintain secure coupler contact

What installation and maintenance steps keep it reliable?

Install the ball using the specified 250 lb-ft torque and the included nut and lock washer to ensure a secure connection. Periodic inspection—checking torque, plating condition, and thread integrity—prevents premature wear and reduces the risk of failure. Replace the ball if plating is compromised or if any deformity appears.

• Torque to 250 lb-ft during installation for proper clamping
• Inspect threads, nut, and ball surface before each towing trip
• Clean and lightly lubricate threads to ease future removal
• Replace if plating chips, or if wear or thread damage is present

Who is this for: The CURT 40005 2-5/16" chrome trailer ball is aimed at owners of class 5 hitches and heavy-duty towing rigs—people who haul dump trailers, toy haulers, dual-axle utility trailers, larger RVs, or similar loads up to 7,500 pounds. If your vehicle and hitch package support class 5 towing and you need a durable, VESC-tested ball with corrosion resistance, this CURT tow ball is a practical, work-ready choice.