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Trailer U-Bolt Kits

A safe and reliable operation is crucial when you are towing a trailer.

U-Bolt Kits are an essential part of your trailer’s assembly, as they provide stability while the trailer is in motion.

U-bolts are known as U-shaped bolts with threaded ends that are, ultimately, used to attach a variety of components together.

Your trailer's U-bolts serve several important functions, such as:

  • A Secure Attachment

U-bolts provide a secure and stable attachment method for a number of components within your trailer - including the axles, leaf springs and other structural elements. This secure connection ensures that these components remain in place during transportation, contributing to your trailer's stability.

  • Even Distribution of Load

U-bolts help to evenly distribute the load and forces that are experienced by your trailer components. This even distribution is going to reduce the stress concentrations. Not only that, but it will also minimize the risk of component failure due to overloading or uneven loading.

  • Vibration Damping

Trailer U-Bolts can help absorb and dampen the vibrations and shocks that occur while the trailer is in motion. This can contribute to a smoother and more comfortable transportation process and help protect the cargo from excessive jolts.

  • Versatility

U-bolts are versatile and can be used in various trailer designs. They come in different sizes and configurations, in order to accommodate different trailer types and load capacities. With that being said, they are suitable for a wide range of trailer applications.

Trailer U-Bolts FAQs

The tightness of trailer U-bolts is important to ensure a secure and safe connection between the components. However, it is also equally important that you do not overtighten the U-bolts. Overtightening the trailer's U-bolts can essentially lead to the components:

  • Failing
  • Becoming Damaged
  • Becoming Distorted

If your trailer's U-bolts are starting to go bad, you may notice that the leaf spring is not properly functioning or that the axle has shifted. Bad U-bolts can additionally cause your pinion angle to be off, which is going to result in vibrations. Not only that, but unusual noises and loss of ride height are other areas of concern that you should be watching for, as well.

U-Bolt Kits should be frequently maintained on a regular basis. By regularly inspecting your trailer's U-bolts, you will be able to catch any stretching or corrosion issues. If you add significantly more weight to your trailer without upsizing your U-bolts, it will eventually lead to breakage sooner or later. This is because U-bolts are not known as a one-size-fits-all component.

Trailer U-Bolts are generally measured based on several key dimensions. This is to ensure the proper fit and function for your specific trailer application. With that being said, the main measurements include:

  • U-Bolt's Diameter

The diameter of the U-bolt refers to the thickness of the metal rod that forms the u-shape. It is either measured as the inside diameter (ID) or the outside diameter (OD). Ultimately, it is going to depend on the particular design of the U-bolt. It is essential that the diameter matches the size of the pipe, bar or component that the U-bolt will be fastened around.

  • U-Bolt's Leg Length

The leg length of a U-bolt is the distance from the center of the “U” to the end of the threaded ends. It is vital that this measurement is sufficient, so that the U-bolt can accurately wrap around the intended component. Not only that, but the lock nuts should be able to securely fasten to the U-bolt without excessive threading. With that said, it is important that you also measure the U-bolt from the inside of one leg to the inside of the other leg.

  • U-Bolt's Thread Size

The thread size is the diameter and pitch of the threads that are on the ends of the U-bolt. This measurement is going to determine the proper size of lock nuts that should be used to secure the U-bolt in place.

  • U-Bolt's Inside Width (I.D.)

The inside width is known as the distance between the inner edges of the two legs on the U-bolt. It is important that you match the width to the size of the component that the U-bolt will be clamping around – for instance, an axle or leaf spring.

  • U-Bolt's Overall Width (O.W.)

The overall width is referred to the measurement across the widest points of the U-bolt, which includes the curve of the U shape. This measurement is going to ensure that the U-bolt is able to properly fit within the available space on the trailer frame or other components.

Typically, it is not recommended that you cut Trailer U-Bolts to fit a specific application. By cutting your trailer U-bolts, you could compromise their integrity, which would ultimately lead to reduced load capacity or failure.

U-bolt kits are manufactured with particular dimensions and lengths, in order to provide your trailer with the necessary strength and support. It is best to select a U-bolt kit that has the appropriate size and dimensions.

Trailer U-Bolt Kits are going to include:

  • U-Bolts
  • Lock Nuts
  • Tie Plates

Trailer U-bolts are bent in the shape of a "U". They also have threaded ends, so that they can accommodate the nuts.

We also have high quality Bearing Kits and Hub Kits available for your trailer application, as well.