1. Trailer Hitch Ball
  2. Weigh Safe
  3. Trailer Hitch Ball
  4. 2-5/16 Inch Diameter Ball
  5. Tongue Weight Scale Ball
  6. 10000 lbs GTW
  7. Class IV
  8. Class V
Weigh Safe 2-5/16" Hitch Ball w/ Built-In Scale - Stainless Steel - 10,000 lbs GTW

Weigh Safe 2-5/16" Hitch Ball w/ Built-In Scale - Stainless Steel - 10,000 lbs GTW

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Trailer Hitch Ball
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Weigh Safe 2-5/16" Hitch Ball w/ Built-In Scale - Stainless Steel - 10,000 lbs GTW Tongue Weight Scale Ball WSUN-3
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This 2-5/16" hitch ball has a built-in scale that lets you measure tongue weight when your trailer is hooked up to determine if you can safely tow. Stainless steel construction resists rust and corrosion. Lowest Prices for the best trailer hitch ball from Weigh Safe. Weigh Safe 2-5/16" Hitch Ball w/ Built-In Scale - Stainless Steel - 10,000 lbs GTW part number WSUN-3 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (14)
  • Q & A (10)
  • Photos
  • Why etrailer?

Weigh Safe Trailer Hitch Ball

  • Trailer Hitch Ball
  • 2-5/16 Inch Diameter Ball
  • Tongue Weight Scale Ball
  • Weigh Safe
  • 10000 lbs GTW
  • Class IV
  • Class V
  • Stainless Steel

This 2-5/16" hitch ball has a built-in scale that lets you measure tongue weight when your trailer is hooked up to determine if you can safely tow. Stainless steel construction resists rust and corrosion.


  • Hitch ball provides connection point for your trailer's coupler
  • Tongue weight scale built into the hitch ball helps you balance your trailer
    • Promotes safe towing - lets you know if your load needs to be adjusted before you tow
    • Simple operation - automatically provides a measurement every time you couple your trailer
    • Efficient and hassle-free - eliminates the need for separate or commercial scales
  • Stainless steel construction is corrosion resistant
    • Shank is heat treated for superior strength and dependability
  • SAE J684 certified and VESC Regulations V-5 compliant
  • Made in the USA


  • Ball diameter: 2-5/16" diameter
  • Weight capacity: 10,000 lbs
  • Tongue weight capacity: 1,500 lbs
  • Shank diameter: 1"
  • Fits ball mount platforms that are 3/4" thick
  • Overall height: 6"
  • Scale dimensions: 3" long x 2" wide x 2-1/4" tall
    • Scale sits below the ball mount platform when installed
  • Warranty:
    • Limited lifetime for hitch ball
    • 1-Year limited for scale gauge

Weigh Safe hitch ball application

This Weigh Safe hitch ball has an easy-to-use, built-in scale that measures your trailer's tongue weight every time you tow. If the scale indicates that your tongue weight is too low or too high, you can adjust it before you head out so that you can complete your journey with peace of mind, knowing that your setup is safe.

What is Tongue Weight?

Tongue weight (TW) refers to the weight that the fully loaded trailer exerts downward on the hitch ball of the tow vehicle. Tongue weight is typically 10 percent - and should not exceed 15 percent - of your gross trailer weight. For example, a 10,000-lb trailer should have a tongue weight between 1,000 lbs and 1,500 lbs. You can adjust the tongue weight of your trailer by removing or adding cargo, or redistributing the load on the trailer. The tongue weight should not exceed the capacity of your tow vehicle, your hitch, or any of your towing components.

Why is Tongue Weight So Important?

Weigh Safe helps ensure proper trailer tongue weight

Simply put, too little tongue weight can cause trailer sway and too much tongue weight can cause the tow vehicle to perform poorly. You may have difficulty steering, gaining traction, or braking when driving a setup that has too much weight pushing down on the rear of the vehicle. Ultimately, towing with an improper tongue weight can cause you to lose control of your vehicle or cause your trailer to separate from the vehicle.

Built-In Tongue Weight Scale

Weigh Safe built-in tongue weight scale

The Weigh Safe hitch ball's built-in scale signals you to adjust your load before you hit the road, resulting in a much safer and enjoyable towing experience. Before this hitch ball, gauging your trailer's tongue weight was a hassle. You had to rely on inefficient bathroom scales, make a trip to the weigh station, or purchase a separate tongue weight scale. But with the Weigh Safe ball's built-in scale, measuring your tongue weight is as easy as coupling your trailer to your ball mount. Simply attach the hitch ball to your ball mount and hook up your trailer. The weight of your trailer will push down on the hitch ball, which in turn pushes down on an internal hydraulic piston that sits on a bed of oil. When the piston drops into the oil, the pressure reading is sent out to the scale.

Simple Installation

Installation of Weigh Safe hitch ball

Installing the Weigh Safe hitch ball is simple. Insert the shank of the hitch ball through the hole in your ball mount and thread on the included lock washer. Next attach the female fastening nut, which includes the scale, to the hitch ball shank. Then tighten down the female fastening nut.

Superior Stainless Steel Construction

This Weigh Safe hitch ball is constructed of solid stainless steel offering far greater protection against rust and corrosion than standard steel hitch balls that are only painted or plated on the surface. The stainless steel shank is heat treated to increase its overall toughness, shear strength, and tensile strength so that you can safely tow up to 10,000 lbs.

The Weigh Safe hitch ball meets VESC V-5 regulations and is SAE J684 certified. These regulatory bodies - the Vehicle Equipment Safety Commission and the Society for Automotive Engineers - create standards for the design, construction, and performance of automotive and towing accessories. Weigh Safe has had this hitch ball thoroughly tested in simulation to ensure that it complies with these standards. The result is a strong, safe, sturdy product that is built to last.

WSUN-3 Weigh Safe 2 5/16" Universal Hitch Ball with Tongue Weight Scale

Item # WSUN-3

Customer Reviews

Weigh Safe 2-5/16" Hitch Ball w/ Built-In Scale - Stainless Steel - 10,000 lbs GTW - WSUN-3

Average Customer Rating:  4.1 out of 5 stars   (14 Customer Reviews)

This 2-5/16" hitch ball has a built-in scale that lets you measure tongue weight when your trailer is hooked up to determine if you can safely tow. Stainless steel construction resists rust and corrosion.

- WSUN-3

Construction is excellent - certainly appears robust and well made. The scale part is a bit tricky to get working properly (there is a procedure specified in the manual). 634982

- WSUN-3

VERY UNHAPPY CUSTOMER!!! Ordered part and received wrong part. E-mailed etrailer because no one would answer the phone. After several emails back and forth, I got someone to help me, but didn't call me back as stated. 1 week gone by. Called again Monday and no answer at the direct line to the person that didn't call me back. Got someone else on the line and had to start at ground zero. Now they say it will take 2 to 3 days to determine if the warehouse has the correct part or if the part is marked incorrectly, then maybe 5 to 7 days to resend my order. 420051

- WSUN-3

I like the idea of the product... Used it once for a car trailer, almost one year after ordering it. The scale worked when I loaded the car to head to the racetrack, but didn't work when I re-loaded the car back on trailer and had other items added to the trailer changing the original load amount. I ended up unhooking my trailer and installing a standard ball as a safety precaution. Luckily the warranty was still valid. I'm concerned the part is not built well. By the way, my phone call to etrailer was not very comforting. 570730

- WSUN-3

So far, so good. No issues whatsoever. 849962

- WSUN-3

I needed to know my hitch weight ,as you can see my truck was almost MAX OUT on GVW , With this hitch I got my tongue weight at about 600 pounds . 1,000 miles later all good 799695

- WSUN-3

Save me some problems. 779247

- WSUN-3

Just got it and have not used or tested it, but appears to be solidly made and simple to install. Arrived quickly too. Can't wait to use it. 734693

- WSUN-3

I use it to make sure the trailer has the proper tongue weight. It's handy and quick in assisting where to tie down my vehicles, in loading, to get the proper tongue weight. 665988

Excellent. Helps to load and tie down properly
David F - 07/04/2020


- WSUN-3

Hi-quality , everyone should own one ! 663920

- WSUN-3

Very well made 637017

- WSUN-3

Great communication and product delivered on time. I have had nothing but great experiences with etrailer.com. 540924

- WSUN-3

Great product 504955

- WSUN-3

This Weigh Safe ball with scale is a must have for figuring out tongue weight. I use it for a 24' car trailer. Moving the car as little as 6 inches forward or backwards made a 500lb difference in tongue weight. Easy to install. You'll need 2 inch and a half wrenches or 2 big adjustable wrenches to install it. Great service and very quick delivery from etrailer.com. 456869

- WSUN-3

Nice piece. I have it mounted but have not attached the trailer to it to get a weight. 395358


Ask the Experts about this Weigh Safe Trailer Hitch Ball

  • Difference Between Weigh Safe Hitch Balls w/ Built-In Scale
    The main difference between the 3 models of Weigh Safe Hitch Ball with Built in scales is the ball size. For a 2 5/16" ball # WSUN-3, for a 2" ball # WSUN-2, and for a 2" ball and a 2 5/16" adapter # WSUN-1. All 3 models have the same built in scale reading up to 1500 lbs. They're made from stainless steel and have the same general dimensions, the larger ball sizes and adapter will effect the height and width slightly. I recommend # WSUN-1, it gives you the tongue weight scale for...
    view full answer...
  • Weigh Safe Hitch Ball Compatibility with Weight Distribution System
    The Weigh Safe 2-5/16" Hitch Ball w/ Built-In Scale - Stainless Steel - 10,000 lbs GTW # WSUN-3 will not give you a correct reading when the bars of the weight distribution system are engaged. The ball will give a correct trailer tongue weight rating prior to the bars being engaged, but as soon as the bars are added the system will take any cargo weight behind the rear axle of the tow vehicle and disperse the tongue weight across the frame of the trailer. Using a weight distribution...
    view full answer...
  • Can the Weigh Safe Hitch Ball with Tongue Weight Scale be used with Husky Weight Distribution System
    The # WSUN-3 has not specifically been tested with a Husky system, but in general there are clearance issues when using this particular ball with weight distribution systems (WDS), as the WDS bars have been known to crush the scale during turns. I've included a photo that a customer submitted of what happened when they used a similar product with a WDS. Due to the lack of success with most other systems, I advise against using the # WSUN-3 with WDS. Instead, I recommend going with a...
    view full answer...
  • Does Tongue Weight Scale of Weigh Safe Trailer Hitch Ball Stay Installed While Towing
    Yes, the Weigh Safe Hitch Ball # WSUN-3 will keep its tongue weight scale full time. There's no need to remove the scale when towing.
    view full answer...
  • Weight Distribution System Hitch Ball Pressure Increase
    The Weigh Safe 2-5/16" Hitch Ball w/ Built-In Scale # WSUN-3 is not intended to be used with weight distribution systems because the measurement won't be accurate. Your results are not surprising because of the design of both the scale and the weight distribution system. The bars of a weight distribution system are intended to pull the frame down so it will add force to the hitch ball itself. The head unit and bars will help redistribute that tongue weight so there will be less sag on...
    view full answer...
  • Does Cold Temperature Affect Reading of Scale on Weigh Safe Hitch Ball w/ Built-In Scale # WSUN-3
    Temperature does not affect the reading of the tongue weight scale on the Weigh Safe 2-5/16" Hitch Ball w/ Built-In Scale - Stainless Steel # WSUN-3 that you referenced. Because of that Weigh Safe does not have a temperature range for this at all.
    view full answer...
  • Can Weigh Safe 2-5/16-Inch Hitch Ball with Built-In Scale WSUN-3 Be Used During Winter
    Using the Weigh Safe 2-5/16-Inch Hitch Ball with Built-In Scale # WSUN-3 continuously during rough winter weather when road salt is in use will not void the warranty. Certainly such exposure will not be good for it but since this item is made of stainless steel it should hold up. I do recommend periodically rinsing the ball with fresh water when temperatures allow this. If long-term salt exposure marred the nice finish I doubt that just this cosmetic concern would be considered a warranty...
    view full answer...
  • Is the Weigh Safe Hitch Ball WSUN-3 Compatible With Reese Steadi-Flex WD Hitch RP66558
    The Weigh Safe Hitch Ball with Built-In Scale # WSUN-3 is not compatible with a weight distribution/sway control system such as the Reese Steadi-Flex # RP66558. The ball portion alone does have the required 1-inch diameter shank. A better solution for keeping track of your trailer's actual loaded tongue weight is the free-standing Sherline tongue weight scale # 5780. This item offers both a broader range of measurement as well as finer gradations on the dial. This means better accuracy. The...
    view full answer...
  • Why Won't a Hitch Ball with Built-In Scale Work with a Weight Distribution System
    There are three reasons as to why a hitch ball with a built-in scale like the Weigh Safe 2-5/16" Hitch Ball w/ Built-In Scale part # WSUN-3 will not work in the head of a weight distribution system like the Strait-Line Weight Distribution System w Sway Control part # RP66084. 1. Clearance - The face of the scale on the hitch ball would contact the arms in the head of the weight distribution system while turning no matter the orientation of the scale. 2. Shank Diameter - The hitch...
    view full answer...
  • Is the Weigh Safe Hitch Ball # WSUN-3 Compatible With Pro Series WD Head # PS58442
    I went out to the warehouse and compared the Replacement Weight Distribution Bolt-Together Round Bar Head # PS58442 and the Weigh Safe 2-5/16" Hitch Ball w/ Built-In Scale # WSUN-3 that you referenced and it looked like there would be just enough room for the scale to fit on the bottom part of the head. My main concern is whether or not the bars for the Pro Series Weight Distribution (WD) system are going to crush the scale when you are making turns. I attached a picture that a customer...
    view full answer...

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Info for this part was:

Edited by:
Lindsey S
Expert Research:
Jameson C
Expert Research:
Adam R
Installed by:
Cole B
Written by:
Shelly K
Updated by:
Mike S

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