Trailer Ball Size Chart – Know What Works Best for Your Trailer/RV

To ensure a solid connection between your car and what you plan to tow, use the trailer ball size chart to calculate the recommended maximum capacity as per the trailer ball diameter, trailer ball shank diameter, threads per inch, and rise in inches. in brief, there are four standard trailer ball sizes: 1-7/8″, 2″, 2-5/16″ and 3″. These measurements refer to the diameter of the trailer ball. (all details in below size chart)

Trailer Ball Size Chart - Know What Works Best for Your Trailer/RV
Photo by Benjamin Zanatta on Unsplash

Are you the usual camping family, planning on how to travel with your recreational tow vehicle (RV) during the summer. You will definitely require a trailer. A trailer needs to have a ball which is dependent on the trailer size and trailer weight limit. You can immediately jump to the frequently asked questions

Stay tuned as we continue!

Standard Trailer Hitch Ball Sizes
4 standard ball sizes

Table of Content of Trailer Ball Sizes

Trailer Ball Diameter Chart

In the table below you find the trailer ball diameter chart showing the ball tow capacity in pounds and kilograms, ball diameter in inches and cm, rise in inches and cm, threads per inch, shank diameter, and length in inches and cm. All about trailer sizes you can read here or RV size by model you find here

Ball Diameter in (Inches and CMMaximum Load in (Pounds and Kgs)Shank LengthShank Diameter in (Inches and CM)Threads per InchRise in (Inches and CM)Finish
2.3125 inches 5.87375 cm12000 lbs 5443.1084 kgs2.5 inches 6.35 cm1 inch 2.54 cm14NilHeat Treated
2.3125 inches 5.87375 cm24000 lbs 10886.217 kgs2.5 inches 6.35 inches1.25 inches 3.175 cm121inchHeat Treated
2.3125 inches 5.87375 cm30000 lbs 13607.771 kgs3.25 inches 8.255 cm1.25 inches 3.175 cm121 inchHeat Treated
2.3125 inches 5.87375 cm30000 lbs 13607.771 kgs2.5 inches 6.35 cm1.25 inches 3.175 cm12NilHeat Treated
2.3125 inches 5.87375 cm30000 lbs 13607.771 kgs2.75 inches 6.985 cm1.5 inches 3.81 cm121 inchHeat Treated
2.3125 inches 5.87375 cm30000 lbs 13607.771 kgs2.75 inches 6.985 cm1.5 inches 3.81 cm122 inchHeat Treated
2.3125 inches 5.87375 cm30000 lbs 13607.771 kgs2.75 inches 6.985 cm1.375 inches 3.4929 cm121 inchHeat Treated
3 inches 7.62 cm30000 lbs 13607.771 kgs3.25 inches 8.255 cm2 inches 5.08 cm12NilHeat Treated
2.3125 inches 5.87375 cm30000 lbs 13607.771 kgs3.5 inches 8.89 cm2 inches 5.08 cm4.5NilHeat Treated
2.3125 inches 5.87375 cm30000 lbs 13607.771 kgs4 inches 10.16 cm2.1875 inches NilHeat Treated
Ball Colar 2 inches 5.08 cm2.199 inches  Untreated
Ball Colar 3 inches 7.62 cm2.199 inches  Untreated
2.3125 inches 5.87375 cm 16000 lbs 7257.4779 kgs2.5 inches 6.35 cm1.25 inches12NilChrome

Trailer Ball Hitch Size and Towing Capacity Chart

The hitch ball diameter is crucial in determining the towing capacity, for example, light-duty towing and heavy-duty towing require a 1.875-inch and 2.3125-inch trailer hitch ball respectively.

Light Duty TowingMedium Duty TowingHeavy Duty Towing
1.875-inch or 4.7625 cm trailer hitch ball2-inch or 5.08 cm trailer hitch ball2.3125-inch or 5.87375 cm trailer hitch ball

Hitch Ball / Bolt Diameter and Towing Capacity Chart

Here we have a table showing the ball size in inches and its equivalent bolt diameter in inches and cm and the capacity in pounds and kilograms.

Ball Size in (Inches and CM)Bolt Diameter in (Inches and CM)Capacity in (Pounds and Kgs)
2.3 inches
5.8 cm
1.25 inches 3.175 cm10000 lbs 4535 kgs
1 inch 2.54 cm6000 lbs 2721 kgs
2 inches
5.08 cm
1.37 inches 3.49 cm10000 lbs 4535 kgs
1.25 inches 3.1 cm6000 lbs 2721 kgs
1 inch 2.54 cm6000 lbs 2721 kgs
0.75 inches 1.9 cm3500 lbs 1587 kgs
1.8 inches 4.7cm1 inch 2.54 cm2000 lbs 907 kgs
 0.75 inches 1.905 cm2000 lbs 907 kgs

Detailed Trailer Ball Hitch Size Chart.

Having a detailed trailer ball hitch size chart is just great. The size chart has the class, basic use, size of the opening in inches and cm, gross trailer weight, and tongue weight in pounds and kilograms.

ClassBasic UseSize of Opening in (Inches and CM)Gross Trailer Weight in (Pounds and Kgs)Tongue Weight Capacity in (Pounds and Kgs)
Class 1Light Duty1.25 inches 3.175 cm2000 lbs 907 kgs200 lbs 90 kgs
Class 2Moderate Duty1.25 inches 3.175 cm3500 lbs 1587 kgs350 lbs 158 kgs
Class 3Versatile/Mix2 inches 5.08 cm3500 to 6000 lbs 1587 kgs to 2721 kgs350 to 600 lbs 158 kgs to 272 kgs
Class 4Heavy Duty2 inches5.08 cm10 to 12000 lbs 4535 kgs to 5443 kgs1000 to 1200 lbs 453 kgs to 544 kgs
Class 5Heaviest Duty2.5 inches 6.35 cm16 to 20000 lbs 7257 kgs to 9071 kgs1600 to 2000 lbs 725 kgs to 907 kgs

Trailer Ball Size for Towing Chart

In the table below we have the trailer hitch class and the equivalent towing capacity in pounds and kilograms. Each class has the compatible vehicles vividly shown in the trailer ball size for towing chart.

Trailer Hitch ClassTowing Capacity in (Pounds and Kgs)Compatible Vehicles
Class 5Above 10000 lbs 4535 kgsFull Size and Commercial Trucks
Class 410000 lbs 4535 kgsSUVs and Full sized Trucks
Class 38000 lbs 3628 kgsSUVs and Mid sized Trucks
Class 23500 lbs 1587 kgsCrossovers and Minivans
Class 12000 lbs 907 kgsSmall Cars

Axle Ratio and Safe Towing Weight Chart

In the chart below, we have the axle ratio, maximum trailer, and gross combination weight ratio in (pounds and kilograms) for each type of vehicle for safe towing.

VehicleAxle RatioMaximum Trailer WeightGross Combination Weight Ratio (GCWR)
1500 Series 2WD Short Wheelbase   
5.3L V83.086600 lbs (2994 kgs)12000 lbs 5443 kgs
5.3L V83.428600 lbs (3901 kgs)14000 lbs 6350 lbs
1500 Series 2WD Long Wheelbase   
5.3L V83.086300 lbs (2858 kgs)12000 lbs 5443 kgs
5.3L V83.428300 lbs (3765 kgs)14000 lbs 6350 kgs
1500 Series 4WD Short Wheelbase   
5.3L V83.086400 lbs (2903 kgs)12000 lbs 5443 kgs
5.3L V83.428400 lbs (3810 kgs)14000 lbs 6350 kgs
1500 Series 4WD Long Wheelbase   
5.3L V83.086000 lbs (2722 kgs) 
5.3L V83.428000 lbs (3629 kgs) 

Trailer Weight Chart

In the table below you will find the utility trailer, single axle, and tandem axle trailer types.

Utility TrailerSingle AxleTandem Axle
Recreational VehicleMotorcycles, ATVs, WatercraftsToy Haulers
Boat TrailerAluminum TrailerFiberglass Trailer
Livestock / Horse TrailerLivestock Trailer(gooseneck pull)Horse Trailer (Bumper Pull)
Camper / 5th WheelCamper5th Wheel

Frequently Asked Questions

How to choose a ball mount and trailer ball size?

How to Choose a Ball Mount and Trailer Ball by

What is the most popular size of a trailer ball for a trailer hitch?

The 2-inch ball size is the standard size that is mounted on most vehicles’ hitch assembly. This is mainly due to its ability to match up to the 2-inch hitch receiver which is again the most common size among the variety of sizes of trailer hitch receivers available in the market. The 2 5/6 inches, the 1 7/8 inches, and the 3 inches diameter sized trailer hitch balls are other less common but also available options of trailer hitch balls.

How many trailer hitch ball sizes exist in the market?

There are about four different sizes of trailer hitch balls that are readily available in commercial hitch ball sellers. The 1 7/8 inches tow ball, 2 5/6 inches ball hitch, 2-inch ball size, and the 3-inch ball hitch which is commonly used in the gooseneck mount for the 5th wheel gooseneck hitch. Light duty trailers are towed by the 1 7/8 inches tow ball, medium load trailers are towed using the 2 inches trailer hitch ball, while the heavy trailers are towed with the 1 7/8 inches trailer ball hitch

Should the ball hitch size and the coupler size always match?

The ball hitch and the coupler size should always match to avoid any kind of play between the two. A mismatch between the trailer ball hitch size and the coupler size can lead to an accident in case of a disconnection.

Which trailer ball size is the most versatile?

The 2-inch hitch ball size is the standard ball size for its versatility in load handling that ranges from 1587.5 kg loads to 5443.1 kg load as the gross trailer weight. the 2-inches ball hitch diameter is also found as part of other popular hitch mounts, among them includes the camper, the utility trailers, the 5th wheel, and other typical tow vehicles.

How do you determine the trailer hitch ball size?

Where the diameter of the hitch ball sphere is not marked on top of the ball, you can always use the usual measuring tools available to you whether it is a ruler or a tape measure or even if it is calipers, any of these tools should give you the precise ball measurement. Other measurements like the hitch ball shank diameter, trailer ball hole diameter, base thickness, number of threads on the threaded stem shank can also be measured to ensure the components match as required and that there will be a safe connection before towing any load.  

Which among the trailer hitch balls is the smallest?

The trailer hitch ball that can be ranked as the smallest for towing lightweight load class in tow ratings is the 1-7/8” tow ball. This tow ball size fits with the 1-7/8” coupler that has a load capacity of between 2000 lbs and 3500 lbs gross trailer loads.

What trailer hitch ball size would be recommended for my trailer?

The recommended trailer hitch ball size is always the one that would match the size of its coupler. The coupler size or measurement should be clearly indicated on the coupler or can be measured directly with a ruler or tape measure. The coupler size determines the hitch ball size since the two measurements should always be the same.

Trailer Ball sizes explained (tutorial)

Trailer ball size by hitchstoregarage


For safe and efficient towing whereby there will not be a vehicle and trailer disconnect and also no damage to the vehicle brake pads or general brake failure due to excess towing weight, it is good to ensure that the rating of the towing set up and the vehicle towing capacity do match. This information can also be found on vehicle towing charts or other media like the trailer life magazine. The trailer tongue weight should always be measured using any scale i.e household scale or bathroom scale placed on a box, or a built-in scale to make sure your vehicle is properly loaded before you begin towing. Ensure also that the safety chain, locking pin, and trailer brake lights are all secured and installed as required.

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