CURT Class 4 Ball Mount Tow Kit with Dual 2 Inch and 1-7/8 Inch Balls 2 Inch Drop 1 Inch Rise Includes Pin and Clip 45310 21500 40090

Class 4 Ball Mount 10,000 LBS Tow Kit w/ Dual Balls (2" + 2-5/16") - 2" Shank, 2" Drop, 1,000 LBS Tongue Capacity, 1" Rise (Flipped), Includes Pin/Clip

Part 1: Class 4 Ball Mount (Part #45520)

When you demand more from your towing equipment, CURT class 4 ball mounts answer the call. Our heavy-duty ball mounts are constructed from quality steel and feature a 2" x 2" shank. They are built to complement CURT class 4 trailer hitches and are perfect for towing large boat trailers, RVs, livestock and horse trailers as well as a variety of other farm and industrial-type trailers. (NOTE: Never exceed the lowest weight capacity of any towing component; i.e. the vehicle, hitch, trailer, etc).

This class 4 ball mount has a gross trailer weight capacity of 10,000 lbs. and tongue weight rating of 1,000 lbs. It has a standard drop of 2" or can be flipped to provide 1" of rise. It also features a hollow shank, allowing an anti-rattle hitch pin or lock to be used for reduced noise and vibration. CURT class 4 ball mounts are CNC-formed, robotically welded and mechanically descaled to create a flawless product. We finish our heavy-duty ball mounts in a gloss black powder coat for superior rust, chip and UV resistance. It includes a 1-1/4" ball hole to accept a trailer ball with a 1-1/4" shank.

• Fits trailer hitches with a 2" x 2" receiver tube opening
• Equipped with a 1-1/4" hole to accept trailer balls
• 2" drop or 1" rise for precise trailer leveling
• Hollow shank reduces weight and allows anti-rattle pin use
• CNC-formed, robotically welded, and mechanically descaled
• Protected by a durable gloss black powder coat finish
• Made in USA
• Limited lifetime warranty (one-year finish, one-year parts)

Part 2: 5/8" Hitch Pin (Part #21500)

Secure your ball mount confidently with the CURT 5/8" hitch pin and clip. Made from solid steel and coated in a zinc finish, this pin offers excellent resistance to rust and corrosion for reliable, long-lasting use. It is designed to fit any 2" receiver tube and includes a standard clip for easy, secure installation. A 105-degree bend on the handle offers an improved grip and ensures the pin stays firmly engaged.

• 5/8" diameter pin fits 2" x 2" receiver tubes
• Secures ball mounts and other receiver tube inserts
• Bent handle for easier grip and secure engagement
• Zinc-plated for corrosion resistance
• Limited lifetime warranty (one-year finish, one-year parts)

Part 3: 2" Trailer Ball (Part #40090)

CURT 2" trailer balls are engineered for strength, precision, and reliability. Made from high-strength steel, this 2" ball fits most standard utility trailers, boat trailers, and campers. With a ball capacity of 10,000 lbs. and a 1-1/4" shank diameter, it provides a secure, robust connection. The fine-threaded shank improves holding power and installation torque. A nickel-chrome finish protects against rust and wear.

• Fits 2" couplers and accepts up to 10,000 lbs. GTW
• 1-1/4" diameter shank, 2-5/8" long, with 0" rise
• Hot-forged steel construction for high strength
• Chrome-plated finish resists corrosion
• Fine threads for superior holding strength
• Zinc-plated hex nut and helical lock washer included
• Tested to meet U.S. VESC V-5 safety specifications
• Limited lifetime warranty (one-year finish, one-year parts)

Part 4: 2-5/16" Trailer Ball (Part #40006)

The CURT 2-5/16" trailer ball is built for heavy-duty towing and engineered with precision for superior strength. This ball is ideal for use with class 5 hitches and is compatible with a wide range of large trailers, including toy haulers, dump trailers, farm trailers, and RVs. It has a 10,000 lb. weight rating and is crafted from hot-forged steel with a corrosion-resistant chrome finish. Its 1-1/4" x 2-5/8" shank and included hardware provide secure and stable mounting.

• Fits 2-5/16" couplers and accepts up to 10,000 lbs. GTW
• Constructed from high-strength, hot-forged steel
• 1-1/4" shank diameter, 2-5/8" shank length, 0" rise
• Durable chrome-plated finish for long-lasting protection
• Zinc-plated hex nut and helical lock washer for secure mounting
• Fine threads provide superior grip and strength
• Tested for safety to meet U.S. VESC V-5 specifications
• Limited lifetime warranty (one-year finish, one-year parts)