1. Trailer Hitch Ball
  2. Curt
  3. Trailer Hitch Ball
  4. 2-5/16 Inch Diameter Ball
  5. 2 Inch Diameter Shank
  6. Standard Ball
2-5/16" Hitch Ball - 2" Diameter x 3-1/2" Long Shank - Machined - 30,000 lbs

2-5/16" Hitch Ball - 2" Diameter x 3-1/2" Long Shank - Machined - 30,000 lbs

Item # C40088
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Curt Trailer Hitch Ball - C40088
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Durable machine-finished steel ball has a 2" diameter x 3-1/2" long shank. Coarse threads on shank are durable and allow quick, simple tightening of nut. Lock washer and nut included. Lowest Prices for the best trailer hitch ball from Curt. 2-5/16" Hitch Ball - 2" Diameter x 3-1/2" Long Shank - Machined - 30,000 lbs part number C40088 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (8)
  • Q & A (6)
  • Videos (1)
  • Photos
  • Why etrailer?

Curt Trailer Hitch Ball - C40088

  • Trailer Hitch Ball
  • 2-5/16 Inch Diameter Ball
  • 2 Inch Diameter Shank
  • Standard Ball
  • Curt
  • 30000 lbs GTW
  • Class V
  • Raw Steel
  • 3-1/2 Inch Shank Length

Durable machine-finished steel ball has a 2" diameter x 3-1/2" long shank. Coarse threads on shank are durable and allow quick, simple tightening of nut. Lock washer and nut included.


  • Hitch ball provides a connection point for your trailer's coupler
  • Coarse threads (4-1/2 threads per inch) are resistant to stripping and allow fast, easy tightening of nut
  • Heat-treated steel is durable
  • Raw, machine finish
  • Lock washer and nut included


  • Ball diameter: 2-5/16"
  • Shank dimensions: 2" diameter x 3-1/2" long
  • Weight capacity: 30,000 lbs
  • Fits ball mount platforms at least 3/8" thick
  • 1-Year limited warranty

40088 Curt 2-5/16" Hitch Ball with Long Shank - 30,000 lbs GTW - Machine Finish

Replaces A-91 40091

Video of 2-5/16" Hitch Ball - 2" Diameter x 3-1/2" Long Shank - Machined - 30,000 lbs

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Curt Hitch Ball - Trailer Hitch Ball - C40088 Review

Today we're going to be taking a look at the 2-5/16" hitch ball from Curt. This ball provides a connection point for your trailer's coupler. It's going to feature steel construction with a raw machine finish. The shank features a coarse thread design so that's going to be five threads per inch. It does come with the lock washer and the nut for installation. The nut, from edge to edge, flat to flat, measure 2-15/16".

The ball diameter is a 2-5/16" ball. When it comes to the dimension of the shank, starting with the diameter, measuring edge to edge, it's going to give us a diameter of 2". The length of that shank, from the bottom of the ball platform to the end of the threads, it's going to be about 3-1/2" long, and this ball provides a capacity of 30,000-lbs. That's going to do it for today's look at the 2-5/16" hitch ball from Curt.

Customer Reviews

2-5/16" Hitch Ball - 2" Diameter x 3-1/2" Long Shank - Machined - 30,000 lbs - C40088

Average Customer Rating:  4.9 out of 5 stars   (8 Customer Reviews)

Durable machine-finished steel ball has a 2" diameter x 3-1/2" long shank. Coarse threads on shank are durable and allow quick, simple tightening of nut. Lock washer and nut included.

- C40088

Exactly as advertised, and very good response time. Received in a couple of days. Would highly recommend. 671755

- C40088

exactly what I needed 551512

- C40088

The product is what I needed. But the customer service was second to none. I needed this particular sized ball for my fifth wheel. The RV dealer did not carry it, they suggested a competing online company. To order from that company I needed to become a member. I ordered this hitch, it was sent the next day, and I got this in two days. In that time frame the other company just got back to me about setting up a membership. I am not a dealer, so I don't want to be forced to a membership. Thank you etailer for making the process simple and faster than my "prime" member ship. 488113

- C40088


- C40088

Perfect! I took my truck to three different trailer/hitch "stores" here in the Tulsa area. No one could help me with the ginormous threaded thing in the bed of my truck. All I got was "Nope, we ain't got nutin like that there. That's and old system; older an' the truck is". Went online here, found what I needed, ordered it and it was here in just a few days! Thank you, etrailer! It fits perfectly and is exactly what I needed! 454134

- C40088

I needed the ball in 5 days so I chose 3 day shipping and got it within 24 hrs of order time. I had been looking for a ball like this all day online and couldn't find it until I got on e trailers web site, awesome experience. 397315

- C40088

As advertised and great shipping. Excellent customer service. 295598

- C40088

The ball I ordered was heavy-duty and exactly what I needed. It was shipped right away. I am very happy with the product and the service I received. 237829

Works great. Especially with my Anderson hitch. You couldnt tell there was 26,000 lbs. back there.
Albert W - 02/14/2017


Ask the Experts about this Curt Trailer Hitch Ball

  • Curt # 40088 Hitch Ball Threads Per Inch
    I reached out to my contact at Curt and he confirmed the threads on the Curt hitch ball # C40088 is standard coarse threading of 4.5 threads per inch just like the B&W hitch ball # BWHB94009 you referenced.
    view full answer...
  • Availability of 2-5/16 inch Hitch Ball with 2 Inch Diameter Shank
    We do have a few 2-5/16 inch hitch balls with a 2 inch diameter shank available, such as the Curt # C40088, however these do not feature any kind of rise. The Curt hitch ball has shank with a 3-1/2 inch length. This hitch ball will provide a weight capacity of 30,000 pounds. I have attached a short demonstration video on this product for you to check out.
    view full answer...
  • Tips for Getting a Nut Loose From a Ball on a Ball Mount
    Tightening a ball to a ball mount does require a substantial amount of foot pounds of torque. The lock washer puts further tension on it. What you can do is put the ball mount in the shank side ways and use a special wrench for the large nut to get enough leverage to break the nut free. If it was cross threaded, you will not want to re-use the ball due to thread damage. Some penetrating oil might also help. Let it soak in for 15 minutes. Curt makes a wrench, # C20001, if the ball you...
    view full answer...
  • Installation of a Curt Trailer Hitch Ball with a Round Shank, # C40088
    What you can do is place the ball in the ball mount and thread the lock nut and nut on the shank hand tight. Then place the ball upside down in a bench vise, gripping the somewhere below the ball so you do not scrap up the ball. Then you can use a wrench to tighten the nut to the specifications indicated on the tag for the ball.
    view full answer...
  • Gooseneck Hitch Ball With 2 Inch Diameter Shank
    For your 2 inch diameter shank we only have the coarse thread option for the 2-5/16 inch hitch ball. If you can make that work, we have the 2-5/16" Hitch Ball - 2" Diameter x 3-1/2" Long Shank - Raw - 30,000 lbs # BWHB94009 and the similar Curt # C40088.
    view full answer...
  • Available 2-5/16-Inch Hitch Balls with 2-Inch Diameter Shank
    We do have two 2-5/16-inch hitch balls that have a 2-inch diameter shank that is also 3-1/2-inches long; both appear on the linked page. B&W part # BWHB94009 that you referenced is one and the other is Curt item # C40088. Please note that both of these use a coarse thread, either 4-1/2 or 5 threads per inch; both also include a matching lock washer and nut. All balls in the 2-5/16-inch size appear on the linked page and some of these have fine threads but the two above are the only ones...
    view full answer...

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Info for this part was:

Written by:
Laura H
Installed by:
Cole B
Updated by:
Amanda M
Updated by:
Brian T
Updated by:
Kristina F
Updated by:
Isabelle B

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