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  1. Trailer Hitch Ball
  2. CURT
  3. Trailer Hitch Ball
  4. 2 Inch Diameter Ball
  5. 1 Inch Diameter Shank
  6. Shock Absorbing Ball
Curt RockerBall Shock Absorbing 2" Hitch Ball - 1" Diameter Shank - Chrome - 7.5K
CURT

Curt RockerBall Shock Absorbing 2" Hitch Ball - 1" Diameter Shank - Chrome - 7.5K

Part Number: C40047
In Stock
$49.95
Retail:$67.99
You Save: 27%
Trailer Hitch Ball
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Curt RockerBall with ShockDrop technology bolts onto standard ball mounts to provide comfort and control while towing. Durable, chrome ball has a 1" diameter x 2-1/8" long shank. Anti-swivel, forged steel base has black powder coat finish. Great Prices for the best trailer hitch ball from CURT. Curt RockerBall Shock Absorbing 2" Hitch Ball - 1" Diameter Shank - Chrome - 7.5K part number C40047 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (121)
  • Q & A (0)
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CURT Trailer Hitch Ball - C40047

  • Trailer Hitch Ball
  • 2 Inch Diameter Ball
  • 1 Inch Diameter Shank
  • Shock Absorbing Ball
  • 3500 lbs GTW
  • 2-1/8 Inch Shank Length
  • CURT

Curt RockerBall with ShockDrop technology bolts onto standard ball mounts to provide comfort and control while towing. Durable, chrome ball has a 1" diameter x 2-1/8" long shank. Anti-swivel, forged steel base has black powder coat finish.


Features:

  • Hitch ball provides a connection point for your trailer's coupler
    • Fits 2-1/2" wide ball mount tongues
  • Integrated ShockDrop technology
    • Cushioned isolators reduce rattling and vibration for a more comfortable ride
    • Reduces shock loads to the vehicle during sudden braking or acceleration
    • Minimizes stress on tow vehicle's suspension and brakes for extended longevity
  • Fine threads provide tight, strong grip
  • Anti-swivel base is constructed of forged steel for dependable towing power
  • Durable carbide black powder coat finish on base
  • Corrosion-resistant chrome finish on ball
  • Virtually maintenance-free with no airbags or bearings to service
    • Built-in grease zerk makes it easy to lubricate when necessary
      • Molybdenum-based grease (LM54FR - sold separately) only recommended
  • Tested for safety to meet SAE J684 specifications
  • Lock washer and nut included


Specs:

  • Ball diameter: 2"
  • Shank dimensions: 2-1/8" long x 1" diameter
  • Weight capacity: 7,500 lbs
  • 1-Year limited warranty


Note: All RockerBall hitch balls will sit 1-1/2" higher than a standard hitch ball due to their shock absorbing base.

The mounting platform on your ball mount must be at least 3/8" thick and the hole size must not be more than 1/16" larger in diameter than the ball's threaded shank.

Not to be used with a cushioned ball mount.


Towing can be brutal, especially when your setup is outfitted with standard, metal-on-metal components. Steel and aluminum can only absorb so much vibration and chucking, so every time you hit a bump in the road, that shock gets transferred to the rest of your rig, leaving it vulnerable to wear and tear. Another unfortunate side effect is an uncomfortable ride for you and your passengers.


Protect your truck and trailer from road shock, vibrations, and rattling - and stay comfortable while you drive - with the shock-absorbing Curt RockerBall hitch ball.


Shock Absorbing ShockDrop Technology

Curt RockerBall with SockDrop Technology

The RockerBall hitch ball features Curt's innovative ShockDrop technology, which is engineered to suppress vibrations and rattling while you're towing. When you hit a bump, the ball compresses around the flexible, polyurethane core. This durable material absorbs excess shock at the coupling point so that it doesn't transfer from the truck to your trailer or vice versa. The result is increased control and comfort as you tow, as well as less wear and tear on your towing setup.


Premium Construction

Curt RockerBall Construction

This hitch ball is built to last with its forged steel construction and durable powder coat finish. The flexible, shock-absorbing polyurethane core withstands extreme heat for long-lasting performance, and the chrome-plated ball resists corrosion.


Curt RockerBall Zerk Fitting

The built-in zerk allows you to lubricate the isolator core when necessary, ensuring quiet and trouble-free operation.



40047 Curt Rocker Ball with Shock Drop Technology - 2" Trailer Ball - Chrome - 7,500 lbs

Installation Details C40047 Installation instructions


California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.7

121 reviews
Curt RockerBall with ShockDrop technology bolts onto standard ball mounts to provide comfort and control while towing. Durable, chrome ball has a 1" diameter x 2-1/8" long shank. Anti-swivel, forged steel base has black powder coat finish.

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it was not packed well. it came in a Manila envelope without sufficient padding for such a heavy item. Labels all scratched up because of that. The item itself is good quality.



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I thank it is everything that it should be. Works great



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nothing special



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I purchased this to test out. I’m using it on a Ford Ranger and towing a 6x16 enclosed trailer. Curt makes great products I’m sure it won’t disappoint.



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Best ball on the market



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It looks like a quality product, but after buying 3 different drop hitches for my truck it doesn't look like I will ever find one that it will fit on............. so I just bought a stainless ball and went on. Makes for a nice $[XX] paperweight or conversation piece.


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See what our Experts say about this CURT Trailer Hitch Ball

  • Does Curt Rockerball Have to Be Used in Curt Ball Mount/Hitch
    The Curt RockerBalls like the part # C40047 do not require the use of a Curt ball mount or trailer hitch. They can be used in essentially any brand of ball mount or hitch.
    view full answer...
  • Recommended Rise for Ball Mount on 2022 Subaru Outback Wilderness Towing Escapod Topo
    The Curt RockerBall Anti-Rattle Towing Kit # C43KR takes the additional height of the base of the RockerBall into account for the listed 4" rise and 5" drop. I have attached an image below showing how it is measured. Typically, you find the correct rise and drop by measuring the distance from the ground to the top of your receiver hitch opening and subtracting the distance from the ground to the bottom of the coupler. This should be done with your vehicle loaded for accuracy, you do not...
    view full answer...
    Image 1 for
  • Availability of Curt RockerBall Setup With Longer Shank
    The only option that comes from Curt is the # C45WR with the 7-1/2" ball mount length. If you want a longer ball mount you would have to put one together. You could use the Curt RockerBall Shock Absorbing 2" Hitch Ball # C40047 along with something like the # D-4 which is 10-1/4" long. Make sure to measure so you get the right length. Then you will need to attach the Curt Weld-On Sway Control Tab # C45822.
    view full answer...
  • What Type of Grease Needs to be Use with Curt Rockerball
    Hey Andrew, Curt is pretty adamant that you have to use a Moly blend grease with the Rockerballs like with the part # LM54FR so that would be what we would have to recommend you stick with.
    view full answer...
  • Ball Mount For 2002 Toyota Sienna With Curt Hitch C13511 For Towing U-Haul Trailer
    I can help you out with the right ball mount and hitch ball for your 2002 Toyota Sienna so you can tow a U-Haul trailer with the Curt Trailer Hitch Receiver # C13511. When we installed this hitch on a 2002 Sienna, we found that the distance from the ground to the top of the hitch receiver was 13-1/2 inches; since the bottom of the U-haul coupler is going to be 18-1/2 inches from the ground (that is what they mean when they say "optimal ball height" as that is how far off the ground the...
    view full answer...
  • Will a Curt RockerBall Work w/ the Aluminum Curt Ball Mount for 2" Hitches?
    Yes, it will Josh! The Curt Ball Mount for 2" Hitches item # C45290 has a 1" diameter hole. You can use the Curt RockerBall Shock Absorbing 2" Hitch Ball item # C40047 or the 2-5/16" Hitch Ball item # C82KR. Both of them have a 1" diameter shank. What kind of tow vehicle do you have?
    view full answer...
  • Is Brophy Aluminum Ball Mount Compatible with the Curt RockerBall Shock Absorbing 2" Hitch Ball
    Thanks for reaching out again, Jason! Yes, the Brophy Ball Mount # EA40 is compatible with the Curt RockerBall Shock Absorbing 2" Hitch Ball # C40047.
    view full answer...
  • Anti-Rattle Device for Subar Ascent Towing Camper
    Hey Lewis, actually what you are experiencing is looseness between the ball mount and the hitch tube so all you need is an anti rattle device to get rid of that. For that we have the anti rattle part # e99007 which will hold the hitch tube tight to the ball mount and get rid of that sound.
    view full answer...
  • How Tall is Curt Rockerball # C40047 Above Ball Mount Platform
    From the base of the # C40047 up to the top of the ball measures 4.091 inches. This is about 1-3/8 inches taller than a standard ball.
    view full answer...
    Image 1 for
  • Does The Curt RockerBall Shock Absorbing Hitch Ball Have More Of A Rise Compared To A Standard Ball
    You are correct the Curt RockerBall Shock Absorbing 2" Hitch Ball - 1" Diameter Shank - Chrome - 7.5K part # C40047 does have a rise. On a standard hitch ball it sits flush with the ball mount but the RockerBall has the included height of the shock absorber which makes it about 1-1/2" taller than a standard ball. This is important when choosing a ball mount. You want to choose a ball mount that has an additional 2" of drop if your ball mount is in the drop position. For example if your...
    view full answer...
    Image 1 for
  • Can A Convert-A-Ball Cushioned Ball Mount Be Used With A Curt RockerBall?
    Though the Convert-A-Ball # AMSC2 cushioned ball mount and the Curt RockerBall, like the # C40047, are very nice products and will help with chucking and vibrations, they cannot be used together. You are correct in that they will help with the same issues, but may actually end up causing more problems than counteracting them when used together. With that being said, either of these are great options, but it should be noted that the RockerBall hitch balls will sit 1-1/2" higher than a standard...
    view full answer...
  • Height of Curt C82KR, C29FR and C40047 RockerBall Trailer Balls
    The height of the Curt RockerBall from the base that sits upon the ball mount to the top of the ball is as follows: - 2-5/16 inch ball with 1 inch diameter shank, # C82KR is 4.607 inches - 2-5/16 inch ball with 1-1/4 inch diameter shank, # C29FR is 4.712 inches - 2 inch ball with 1 inch diameter shank, # C40047 is 4.091 inches I've provided a diagram showing these dimensions.
    view full answer...
    Image 1 for
  • Will the Curt RockerBall Shock Absorbing Hitch Ball Work With a Weight Distribution System
    The Curt RockerBall Shock Absorbing 2" Hitch Ball part # C40047 will not work with a weight distribution system because the flange that gets wedged between the platform and base that stops the unit from rotating will not fit over the shank on a weight distribution system. Therefore, the Curt RockerBall must be used with a standard ball mount like the Curt Ball Mount for 2" Hitches part # C45310. If you are looking to add a shock absorbing feature to your weight distribution system you'll...
    view full answer...
  • What Grease Is Needed To Lubricate The Curt RockerBall?
    The Curt RockerBall # C40047 requires a Molybdenum-based Grease # LM54FR. It is not acceptable to use the LubriMatic LMX Industrial Strength Grease # L11390. This information is found in the instructions linked below.
    view full answer...
  • What Do I Need To Add Electric Brakes To My Carry All Trailer?
    We can definitely get you all the parts needed to add brakes to your trailer, but it is going to be an extensive list since there currently isn't anything on the axle. I did include an article regarding just this kind of situation, but lets get started. First things first, you will need something for brakes to mount onto. This will be done by having the Brake Mounting Flange # 4-34 welded onto the axle. This will need to be done by an experienced welded as the spacing and placement has...
    view full answer...
    Image 1 for
  • Will Curt RockerBall Fit Curt Ball Mount w/ Sway Control Tab for 2" Hitches
    The anti-swivel base on the # C45WR is missing a tab on one side to make it compatible with the sway control tab. This does not adversely impact the performance. You can use the # C40047 with the # D320 but you would have to bend or cut one of the tabs off of the anti-swivel base to make it fit since it is not available without the tab for the 2" ball.
    view full answer...
  • Availability of Curt Ball Mount w/ Sway Control Tab For 2" Hitch
    It sounds like you're looking for the Curt Ball Mount w/ Sway Control Tab for 2" Hitches # D320. This is the same as the # C45WR but fits a 2" hitch and does not include a ball. If you're going to use your existing 2" ball make sure it has a 1" diameter shank. This ball mount has a 3/4" rise and 2" drop. See the helpful article below which explains how to measure. The Curt RockerBall # C40047 is designed to reduce shock , rattling, and vibration to give you a more comfortable ride. It...
    view full answer...
  • What if Grease Zerk Breaks Off Curt RockerBall
    The ball must be greased when using the Curt RockerBall Shock Absorbing 2" Hitch Ball # C40047. As you can see by the cut out of the linked instructions, if you don't have adequate lubrication the ball can fail so it is imperative you do. The zerk itself isn't replaceable, you need to to replace the RockerBall. Thankfully it sounds like it is new so the ball is under 1-year warranty.
    view full answer...
    Image 1 for
  • Can The Curt RockerBall Be Used With Convert-A-Ball Shock Absorbing Ball Mount?
    I personally spoke to Curt who informed me their Curt RockerBall Shock Absorbing 2" Hitch Ball # C40047 should not be used with the Convert-A-Ball Ball Mounts including # CAB-UM. For the best experience I recommend using a ball mount with the correct amount of drop with the RockerBall and a anti-rattle. This will eliminate the play between the ball mount and your receiver allowing the RockerBall to absorb the trailer shock. We have a couple kits which have all the parts listed below otherwise...
    view full answer...
  • What is The Proper Torque Specification For The Curt 2" RockerBall with 1" Shank?
    I have included a link to the installation instructions for the Curt RockerBall Shock Absorbing 2" Hitch Ball # C40047 below that will give you the correct torque specification. Be sure to follow the specifications listed in step 2 to ensure the ball is properly installed. Remember to grease the RockerBall via the grease zerk with a molybdenum-based grease every 3 months or 3,000 miles.
    view full answer...
  • Moly Grease to Use with Curt Rockerball
    We do carry Moly grease like with the LubriMatic Moly EP grease part # LM54FR which would work great with the Curt Rockerballs like the part # C40047 that you referenced.
    view full answer...
  • 3 Inch Rise/4 Inch Drop Ball Mount for Curt C40047 RockerBall Trailer Ball
    The Curt # C84WR is 2-3/4 inches wide at the ball platform, so it won't work with your # C40047 Curt RockerBall. This being said, we do offer a ball mount with a similar rise/drop with a 1 inch diameter ball hole that would work. I'd recommend the Draw-Tite # 2753 which has a 7500 lb capacity, a 2-3/4 inch rise or a 3 inch drop.
    view full answer...
  • Solution for Preventing Rattling Between Trailer Hitch Ball and Coupler
    We have the perfect solution for you with the Curt RockerBall, part # C29FR for 2-5/16" ball or # C40047 for a 2" ball. It completely changes your towing experience by reducing jerking and jarring while towing. It absorbs the movement and rattling of your trailer at the coupling point to provide a smoother ride and increased control over the vehicle and trailer. It also reduces the amount stress placed on your vehicle, receiver hitch, brakes and suspension system. Note: All RockerBall...
    view full answer...
  • Shock Absorbing Solution for Towing Lightweight Trailer with Class II Hitch Receiver
    For your application I recommend checking out the Curt RockerBall Shock Absorbing 2" Hitch Ball which comes with a 3/4" diameter shank as part # C94CR or with a 1" diameter shank as part # C40047. This unique hitch ball absorbs the shock at the connection between the hitch ball and ball mount which is perfect for a lighter application like what you have. Please note that the mounting platform on your ball mount must be at least 3/8" thick and the hole size must not be more than 1/16" larger...
    view full answer...


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