Behind the Numbers: How to Measure Your Trailer U-Bolt

When you’re looking to purchase a U-bolt for your trailer, the size of the product will be listed as something like this:



⅜ X 1 ¾” X4”? What do those numbers mean, and how can I use them to determine the right product for me? You may be asking yourself these questions; we’re here to answer them for you.

Any U-bolt, trailer or otherwise, is measured using these three dimensions:

Diameter of leg X Distance Between Legs X Leg Length*

In this picture, measure A is the Distance Between Legs, and measure B represents Leg Length.

ubolt_smallIn the case of the first product shown in image 1, then the measurements are as follows:

Diameter of Leg = ⅜ “
Distance Between Legs = 1 ¾ “
Leg Length = 4”

*It is important to note that Leg Length is measured from the base of the leg to the inside curve of the bend, not the top of the bend.

Using these three numbers, you will now be able to determine what size U-bolt you currently have in order to replace it. If you are having trouble fitting your trailer U-bolt correctly, you can learn about other characteristics that might be affecting your U-bolt fit, or contact us directly.


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