CURT 2-5/16-Inch Trailer Hitch Ball 30,000 lb Capacity — Raw Steel, 1-1/4 x 2-5/8-Inch Shank

The CURT 40085 is a heavy-duty 2-5/16-inch trailer hitch ball engineered in raw steel to tow up to 30,000 pounds with a 1-1/4" x 2-5/8" shank for secure mounting.

This trailer ball is built for demanding towing tasks where strength, fit, and reliability matter. CURT designed the 40085 to pair with class 5 hitches and ball mounts, offering a straightforward, rugged connection between your tow vehicle and a wide range of receiver-style trailers—from utility trailers to deluxe RVs. The ball is hot-forged, heat-treated, and supplied with a hex nut and helical lock washer so you can install it with confidence and maintain secure service under heavy loads.

How much weight can this CURT hitch ball safely handle?

The CURT 40085 is rated for a gross trailer weight of up to 30,000 pounds when installed and used within the limits of your vehicle and hitch system. Always adhere to the lowest-rated component in the towing setup—vehicle, hitch, coupler, or ball—to determine your safe towing capacity.

• Rated capacity: 30,000 lbs gross trailer weight
• Designed for class 5 trailer hitches and mounts
• Follow vehicle and hitch manufacturer limits as the controlling rating

Will this ball fit my trailer coupler and hitch mount?

This tow ball has a 2-5/16" diameter to match standard 2-5/16" couplers and a 1-1/4" diameter shank that is 2-5/8" long for secure attachment. The fine threads, hex nut, and helical lock washer help create a tight, reliable connection to compatible ball mounts.

• Ball diameter: 2-5/16" — for corresponding couplers
• Shank: 1-1/4" diameter by 2-5/8" length for stable mounting
• Includes zinc-plated hex nut and helical lock washer for secure fastening

What materials and treatments give this ball its durability?

The 40085 is hot-forged from steel and heat-treated to increase wear resistance and strength under heavy use. The raw steel finish emphasizes structural integrity for heavy towing applications while providing a straightforward, serviceable surface.

• Construction: hot-forged steel for maximum strength
• Heat-treated to resist wear during frequent heavy loads
• Raw steel finish for robust performance in heavy-duty use

How is the ball secured and tested for safety?

Installation relies on the included zinc-plated hex nut and helical lock washer and requires the specified torque for a dependable hold. CURT tests this hitch ball to U.S. VESC specifications to align with common safety and performance expectations for towing components.

• Fastening: fine threads, hex nut, and helical lock washer (450 lb.-ft. torque required)
• Safety: tested to U.S. VESC specifications for towing components
• Serviceable design makes inspection and re-torqueing straightforward

Who is this hitch ball for? The CURT 40085 suits owners who need a no-nonsense, industry-grade tow ball for heavy trailers—farm equipment, toy haulers, dump trailers, large utility trailers, and large RVs—where high gross trailer weight capacity and a secure fit are essential. If you operate a class 5 hitch system and require proven steel construction with tested safety credentials, this CURT ball provides a dependable connection point for demanding towing jobs. Remember to confirm all towing component ratings and follow proper installation torque and inspection procedures before every trip.