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  1. Trailer Hitch Ball
  2. Convert-A-Ball
  3. Trailer Hitch Ball
  4. 2 Inch Diameter Ball
  5. 2-5/16 Inch Diameter Ball
  6. 1 Inch Diameter Shank
Convert-A-Ball Interchangeable Ball Set - 2" and 2-5/16" Balls - 1" Shank - Nickel

Convert-A-Ball Interchangeable Ball Set - 2" and 2-5/16" Balls - 1" Shank - Nickel

Part Number: 904b
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Trailer Hitch Ball
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904B - 2-1/4 Inch Shank Length Convert-A-Ball Trailer Hitch Ball
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Ball set with nickel-plated 1" diameter, 2-1/4" long shank. Two hitch balls with 2" and 2-5/16" diameters. 10,000 lbs GTW. Corrosion and rust resistant. Great Prices for the best trailer hitch ball from Convert-A-Ball. Convert-A-Ball Interchangeable Ball Set - 2" and 2-5/16" Balls - 1" Shank - Nickel part number 904b can be ordered online at or call 1-800-940-8924 for expert service.
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Convert-A-Ball Trailer Hitch Ball - 904b

  • Trailer Hitch Ball
  • 2 Inch Diameter Ball
  • 2-5/16 Inch Diameter Ball
  • 1 Inch Diameter Shank
  • Interchangeable Ball Set
  • 10000 lbs GTW
  • Class III
  • Nickel-Plated Steel
  • 2-1/4 Inch Shank Length
  • Convert-A-Ball

Ball set with nickel-plated 1" diameter, 2-1/4" long shank. Two hitch balls with 2" and 2-5/16" diameters. 10,000 lbs GTW. Corrosion and rust resistant.


  • Changing out your Convert-a-Ball for another ball size is easy - just pop out the integrated pin and replace ball with any size Convert-A-Ball trailer hitch ball
  • Includes 1 shank and 2 heavy-duty, interchangeable hitch balls
  • Ball and shank have a new, non-electric nickel-plating technology that produces a strong, protective finish
    • Corrosion resistant, non-magnetic and stain repellent - stands up to whatever you dish out
    • Uniform coverage, even on hard-to-protect recesses and interior surfaces
    • Eco-friendly plating method is less harmful to the environment than traditional chrome electroplating
  • Zinc-plated steel nut and washer resist rust
  • Made in USA


  • Fits ball mounts with 1" diameter ball hole
  • Shank diameter: 1"
  • Shank length: 2-1/4"
  • Ball sizes: 2" and 2-5/16"
  • Towing capacity: 10,000 lbs
  • 2-Year limited warranty

Diagram showing operation of Convert-A-Ball integrated pin

Changing your hitch ball size is as easy as pushing out the integrated pin.

Photo showing the underside of Convert-A-Ball integrated pin

No need to get out the heavy wrenches. Convert-A-Ball's interchangeable balls are equipped with integrated pins, making it easy to change out your hitch ball for one of another size.
To switch balls, simply push in the integrated pin (using a pen or your finger) to release and remove installed ball. Then just replace with different-size ball, reversing the process.

This Convert-A-Ball interchangeable ball set exceeds THMA V-5 ratings in all categories and meets SAE standard J-684.

904B Convert-A-Ball Nickel Plated 2 Ball Set - 2" and 2-5/16" Diameter Balls and 1" Diameter x 2-1/4" Long Shank - 10,000 lbs GTW

Replaces Model 904B, Chrome Plated

Customer Satisfaction Score:

Customer Reviews

Convert-A-Ball Interchangeable Ball Set - 2" and 2-5/16" Balls - 1" Shank - Nickel - 904b

Average Customer Rating:  4.9 out of 5 stars   (799 Customer Reviews)

Ball set with nickel-plated 1" diameter, 2-1/4" long shank. Two hitch balls with 2" and 2-5/16" diameters. 10,000 lbs GTW. Corrosion and rust resistant.


I put this on my truck today. It is heavy steel and looks great. I need to use a 2 inch and a 2 & 5/16 ball for my large trailer. This is going to be a lot easier than changing my lock bar and replacing the entire slid in hitch. I have some chrome balls and they are already peeling off the chrome, these seem to be solid stainless steel. I am well pleased with the purchase and would recommend it to anyone.

Etrailer Expert

Laura E.


Thanks for your business and your review, Harold. These balls are actually nickel-plated.


Great product excellent price. Convertaball is what I have needed for years. No more wrestling hitches around. Thanks,Leroy

Harold L.


Still using it rusted quickly and will not hold contact with the trailer poor product to tight to throw it away


Let you know more after i use it. Looks well made just hope the nickel doesn’t corrode to much


I have two trailers i use alot. One takes a 2" ball the other 2 5/16". this makes switching easy and fast. Love it.

Mike D.


Great it works exactly like it describes. Cuts my switching trailers time to a fraction of what it use to take.


I have one of these Convert-a-ball sets on each vehicle I own!!!
They are very good, easy to swap and made out of high grade steel. I watched them test their balls and hitches at their plant during a visit many years ago. They test them to the MAX!!!!!
All of their ball sets are made in the USA!!! at their SYDNEY NEBRASKA plant. They were the first with the changeable ball system and have it patented. All of the other types are imitators!!!!
Some of the other changeable ball set are made in CHINA out of what kind of material I don't Know!!!!! BUY THE ORIGINAL!!! BUY THE BEST!!!! BUY MADE IN THE USA!!!!!!!!!!!!!!!


Convert-a-ball has been excellent for decades and this latest ball system is no exception. I like the finish of this ball better than the old chromed ones which were slippery when snow covered and easy to drop when changing sizes in winter. If in doubt, get the nickel finish.


Very handy the Convert-A-Ball system when you are pulling multiple trailers on the same day.


Just got the ball set on the truck. Haven't towed with it yet, but love how simple it is to change out the size! I work for a landscape company with multiple trailers with different ball sizes. so this product saves a lot of running around.


Convert-A-Ball This site was really easy and fast to work with. I shipped on the cheapest option and the Convert-A-Ball 2"-2 5/16th kit came within a few days. I was amazed. Most places take forever, but these people really put a rush on it. The quality is solid, 10,000lb rating, and the ergonomics are outstanding. I had my old ball off and this on one in less than a couple minutes. The materials are heavy duty and flawless. I will tow 4,000-8,500lbs or more every day for the rest of my foreseeable future, so I am really putting my faith in this company.


I have been using these for my electric trailer mover. Very easy to go from one size to the other.


The convert-a ball set has a nice nickel finish. It comes with everything needed to install. After ordering the set I was contacted by etrailer stating that the set was not in their warehouse and it would take a few days to get it. I was asked if I needed it sooner or if I wanted to cancel the order. No need to as it showed up sooner than expected. Thanks for the follow up Wayne.


The Convert-A-Ball #904b certainly appears to be a well-made unit. Made in USA. Rated at 10,000 pounds, it will not likely be the weak point in the towing combination. Very pleased with etrailer!


Seems strange after conventional trailer balls but looks like it will work just fine. Nice finish and no cheap look.


You guys are extremely helpful and accommodating, on point with everything and keep us well informed! thank you for that!


I really like the fact I can have one hitch that fits all the size balls is great.


Handy and helpful no need to use wrenches anymore.


Product is great. Nice not to have to unlock the hitch and turn it to the next ball size.


Great product! Can now change from 2" to 2 5/16" without tools!

Mike M.


After 1 year, I am very pleased with this product. I keep the hitch with both balls in the trunk of the car. I can change sizes without tools. Love the flexibility,


I think I am going to enjoy the ease of application. Well made product


excellent product offering flexibility.


Great company. Great service. Forget eBay, forget Amazon, save time, money and aggravation and buy from these guys from the start!!!!!!


Good product, price and shipping.


Great items use them every day these will become spares in case something happens to the other ones this system is so easy to always have the right ball with u


Works great. Easy and simple to use. Wish i would have gotten one sooner.


What a grate product. Love the hitch.

Show More Reviews

See what our Experts say about this Convert-A-Ball Trailer Hitch Ball

  • Can Replacement Balls be Ordered for the Convert-A-Ball Interchangeable Ball Set
    Yes, if you got the Convert-A-Ball Interchangeable Ball Set # 904B and later decided you wanted to also get the 1-7/8 inch ball you could get a Convert-A-Ball Interchangeable Hitch Ball 1-7/8 inch diameter # 300b. Or if you wanted to get all three balls at once you could order a Convert-A-Ball Interchangeable Ball Set # 900B. This comes with a 1-7/8 inch ball, a 2 inch ball and a 2-5/16. I attached a review video for this product for you to check out also.
    view full answer...
  • Are Interchangeable Trailer Ball Kits from Convert-A-Ball Safe?
    The Convert-A-Ball Interchangeable Trailer Ball Kits are perfectly safe up to their 10K capacity, just as safe as a standard one-piece trailer ball, so you'll have no worries there. This is without a doubt the type of interchangeable ball I'd recommend. The side pin arrangement that Convert-A-Ball uses works great, and the pin actually features an o-ring on it to keep moisture and debris out. The # 904B kit you'd looked at is nickel plated, and over time the nickel plating can be worn...
    view full answer...
  • Availability of Replacement Convert-A-Ball Shank for Interchangeable Ball System
    We sure do! For a 1 inch diameter replacement shank, use # 106B or for a 3/4 inch diameter shank, use part # 104B. Both shanks are stainless. There is also a protective cover available for the shanks which is part # 005B.
    view full answer...
  • Stealth Hitches and Other Towing Parts Recommendation for a 2021 BMW X5
    Hey Jerry, thanks for reaching out! Here are the parts I recommend for everything on your 2021 BMW X5: - Stealth Hitches Hidden Trailer Hitch Receiver w/ Towing Kit # SH25VR - Hopkins Endurance Quick-Install 7-Way Trailer Connector # HM47210 - Eclipse Magnetic Mounting Bracket # 306-X6020 - Convert-A-Ball Interchangeable Ball Set # 904b - Curt Echo In-Line Bluetooth Brake Controller # C79DR - K-Source Universal Dual Lens Towing Mirrors # KS3990 The Stealth Hitches kit comes with...
    view full answer...
  • 2 inch and 2-5/16 inch Hitch Ball with Cotter Pin on 1 inch Shank
    It sounds like you're looking for the Convert-A-Ball Interchangeable Ball Set - 2" and 2-5/16" Balls - 1" Shank - Nickel # 904b. This hitch ball enables you to switch between having a 2" or 2-5/16" hitch ball depending on what your trailer calls for, the shank is 1" diameter, and then at the very end of the shank there is a cotter pin as an extra safety precaution to ensure that the hitch ball stays connected to the ball mount (although if everything is torqued properly this should never...
    view full answer...
  • Origin Of Curt Fusion Ball Mount
    The Curt Fusion Ball Mount for 2 inch Hitches - 1-7/8 inch Ball - 2 inch Drop - 5,000 pounds # C45131 is made in china. most hitch balls and pins are made in China. The Curt Ball Mount for 2 inch Hitches - 1 inch Rise, 2-1/4 inch Drop - 7-5/8 inch Long - 7,500 pounds # C45030 is made in the USA but it's only the ball mount. You would still need The Convert-A-Ball Interchangeable Ball Set - 2 inch and 2-5/16 inch Balls - 1 inch Shank - Nickel # 904b and The Hitch Pin # C21500. I attached...
    view full answer...

Do you have a question about this Trailer Hitch Ball?

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video by:
Joshua S
Employee Adele M
Updated by:
Adele M
Employee Hannah L
Updated by:
Hannah L
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Shane T
Test Fit:
Shane T
Employee Hayden R
Installed by:
Hayden R
Employee David F
Installed by:
David F

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