CURT 2-5/16" Trailer Ball — 40006 Chrome, 10,000 lb Tow Ball with 1-1/4" Shank

The CURT 2-5/16-inch chrome trailer ball (model 40006) is a heavy-duty tow ball rated for 10,000 lbs and built for secure, corrosion-resistant towing with a 1-1/4" shank and zinc-plated fastening hardware.

When you need a rugged, dependable connection between your vehicle and a class 5 trailer, this CURT trailer ball is engineered to meet demanding towing tasks. It combines hot-forged steel construction with a nickel-chrome finish and tested U.S. VESC compliance so you get consistent performance during heavy hauling. Designed to match common 2-5/16" couplers, the 40006 balances strength, fit, and longevity for trailers such as toy haulers, farm equipment, dump trailers, and larger RVs.

How does this tow ball deliver the strength required for heavy trailers?

CURT’s 40006 is hot-forged from steel and tested to U.S. VESC specifications to ensure structural integrity under load. The ball’s rated gross trailer weight is 10,000 lbs, and assembly hardware is sized to hold that load securely when installed to specifications.

• 10,000 lb gross trailer weight rating for heavy-duty towing
• Hot-forged steel core for high tensile strength
• Zinc-plated hex nut and helical lock washer for secure clamping
• Fine threads with 450 lb.-ft. torque requirement for proper installation

Will this ball fit my coupler and hitch mount?

The ball has a 2-5/16" diameter designed to seat correctly in standard 2-5/16" couplers, and the shank dimensions match common hitch ball mounts. Confirm your mount’s hole diameter and thickness to ensure the 1-1/4" shank and 2-5/8" length are compatible.

• 2-5/16" ball diameter fits standard 2-5/16" couplers
• 1-1/4" shank diameter matches many class 5 mounts
• 2-5/8" shank length provides adequate engagement through the mount
• Check mount hole size and available shank clearance before installation

How does the finish protect the ball from road elements?

The CURT 40006 is finished with nickel-chrome plating that resists rust and abrasion better than bare steel under normal use. This plating helps prevent corrosion from moisture, road salt, and debris to extend service life and keep mating surfaces smooth.

• Nickel-chrome plating for corrosion and wear resistance
• Smooth finish reduces coupling wear and eases cleaning
• Durable under typical road and weather exposure
• Pairs with proper maintenance to maximize lifespan

What installation and safety checks should I perform?

Proper installation and routine inspections are essential for safe towing. Torque the hex nut to the specified 450 lb.-ft., confirm the lock washer is correctly oriented, and recheck tightness and wear before each trip.

• Tighten nut to recommended 450 lb.-ft. torque for secure hold
• Use the provided helical lock washer to prevent loosening
• Inspect threads, ball seat, and finish regularly for damage or corrosion
• Never exceed the lowest rated capacity of vehicle, hitch, or trailer

Who is this for? The CURT 40006 2-5/16" trailer ball is aimed at owners and operators who tow heavy equipment or larger recreational trailers and need a robust, tested hitch ball that fits standard couplers and class 5 mounts. It’s a suitable choice for contractors, farmers, RV enthusiasts, and anyone hauling heavy loads where strength, a precise fit, and corrosion resistance are priorities. Always pair the ball with compatible hitch components and follow installation and weight-limit guidelines to maintain safe towing conditions.