Best Axle U-Bolt Kits of 2026

Robert Reyes Avatar
Robert Reyes
Last Updated: Jan 10, 2026

* We independently evaluate all recommended products and services. If you click on links we provide, we may receive compensation.

Axle U-Bolt Kits are essential components for any vehicle's suspension system. These kits include high-quality U-bolts, nuts, and washers designed to secure the axle to the leaf spring. They are available in various sizes and finishes to fit different types of vehicles, including cars, trucks, and SUVs. With their durable construction and corrosion-resistant finish, these U-bolt kits provide long-lasting performance and reliable support for the vehicle's axle. They are easy to install and offer a cost-effective solution for maintaining and upgrading the suspension system.

At a Glance: Our Top Picks

Allstar Performance ALL69015 U-Bolt Kit for 1310 U-Joint Cover #TOP 1
Allstar Performance ALL69015 U-Bolt Kit for 1310 U-Joint
ftb score rating icon 9.8
Rough Country 1/2" Round Suspension U-Bolts Set Cover #TOP 2
Rough Country 1/2" Round Suspension U-Bolts Set
ftb score rating icon 9.7
Dorman 13503 Front Lower Control Arm U-Bolt Kit Cover #TOP 3
Dorman 13503 Front Lower Control Arm U-Bolt Kit
ftb score rating icon 9.5

Top 10 Axle U-Bolt Kits

#TOP 1

Allstar Performance ALL69015 U-Bolt Kit for 1310 U-Joint

ALL69015
1.75" Tall
Allstar Performance ALL69015 U-Bolt Kit for 1310 U-Joint Cover
Allstar Performance ALL69015 U-Bolt Kit for 1310 U-Joint , 1.75" Tall

The Allstar U-Bolt Kit is a reliable choice for securing 1310 U-Joints. Its compact packaging, measuring just over 1 by 10 by 17 centimeters, makes it easy to handle and store before installation. Weighing only 0.109 kilograms, this kit is lightweight, so you won’t have to worry about extra bulk during transport or handling. Made in the United States, it assures quality and supports domestic manufacturing. Designed specifically for certain vehicles, this fit type ensures that the kit matches your axle perfectly, giving you a hassle-free installation experience and dependable performance.

What We Like
Compact packaging
Lightweight design
Made in USA
Vehicle-specific fit
#TOP 2

Rough Country 1/2" Round Suspension U-Bolts Set

7639
Black
8" x 3"
Rough Country 1/2" Round Suspension U-Bolts Set Cover
Rough Country 1/2" Round Suspension U-Bolts | 1/2 x 3 x 8-7639 Black

The Rough Country Suspension U-Bolts are built tough with sturdy steel, making them a reliable choice when you need to replace worn suspension bolts. Their black E-coated finish shields them from rust and weather damage, so you won’t have to worry about corrosion over time. These U-bolts come in a perfect size, fitting most suspension setups for a hassle-free replacement or custom installation. Plus, they’re sold in sets of four, allowing you to upgrade your suspension quickly, usually within a couple of hours. This makes them a practical and durable option for maintaining your vehicle’s suspension system.

What We Like
Heavy-duty steel construction
Rust and corrosion resistant
Perfect suspension fit
Includes set of 4 bolts
#TOP 3

Dorman 13503 Front Lower Control Arm U-Bolt Kit

13503
Golden
1/2 inch
Dorman 13503 Front Lower Control Arm U-Bolt Kit Cover
Dorman 13503 Front Lower Lower Control Arm U-Bolt Kit Compatible with Select Chevrolet/GMC/Workhorse Models

The Dorman Control Arm U-Bolt is a reliable replacement part designed to fix worn or damaged control arm bolts on select Chevrolet, GMC, and Workhorse vehicles. Made from hardened steel, it offers strength and durability similar to the original part, ensuring long-lasting performance. This kit is easy to install, helping you restore your vehicle’s suspension without hassle. With over a century of experience, Dorman guarantees quality through strict material testing and validation, so you can trust this product to fit properly and perform well on the road.

What We Like
Direct replacement fit
Hardened steel durability
Proven quality assurance
Trusted manufacturer experience
#TOP 4

Rough Country 9/16" Square Suspension U-Bolts 7609

7609
Black
8.5"
Rough Country 9/16" Square Suspension U-Bolts 7609 Cover
Rough Country 9/16" Square Suspension U-Bolts | 9/16 x 2.5 x 8.5-7609

The Rough Country Square U-Bolts are designed to fit your suspension needs with a sturdy 9/16" square design. These U-bolts measure 2.5 by 8.5 inches, providing a reliable fit to secure your axle firmly. Installation is straightforward and typically takes between 2 to 3 hours, making it manageable for most DIY enthusiasts. Plus, you get peace of mind with Rough Country's Limited Lifetime Replacement Warranty, ensuring your investment is protected over time. If you're looking for durable and dependable axle U-bolts, this product offers convenience and confidence for your vehicle maintenance.

What We Like
Durable 9/16" square design
Precise 2.5 x 8.5 inch size
Manageable 2-3 hour install
Limited lifetime warranty
#TOP 5

Rough Country 9/16" Round Suspension U-Bolts 7623

7623
Black
9.5" x 3.25"
Rough Country 9/16" Round Suspension U-Bolts 7623 Cover
Rough Country 9/16" Round Suspension U-Bolts 3.25 x 9.5 Universal 7623,Black

The Rough Country Suspension U-Bolts offer a strong and reliable upgrade for your vehicle’s suspension system. Made from heavy-duty steel, these U-bolts are built to handle tough conditions and replace worn parts effectively. Their black E-coated finish helps prevent rust and corrosion, so you don’t have to worry about damage from weather or road salt. Designed with a 9/16" thread size and dimensions that fit most setups, these bolts provide a perfect fit whether you’re customizing or replacing old components. Plus, they come in a set of four, making installation straightforward and saving you time during your upgrade.

What We Like
Heavy-duty steel construction
Corrosion-resistant E-coating
Perfect fit dimensions
Set of four bolts
#TOP 6

New Trailer U Bolt Kit for 5200-7000lbs Axles

LIBRA
22080
Silver
New Trailer U Bolt Kit for 5200-7000lbs Axles Cover
LIBRA 5200-7000lbs Trailer U Bolt Kits for 3" Round Trailer Axle …

This Axle U-Bolt Kit is designed for 5,200lbs-7,000lbs round axles with a 3" diameter. It comes with 4 U bolts that are 7" long and have a diameter of 1/2". Additionally, the kit includes 2 tie plates for 1-3/4" or 2" leaf springs and 8 hex nuts with a size of 1/2"-20. This kit is ideal for securing your trailer's axle to its leaf springs, ensuring a safe and smooth ride.

What We Like
Easy to install
Durable material
Comes with all necessary parts
#TOP 7

Dexter AXLE K7138400 Conversion Kit

K7138400
Regular
Dexter AXLE K7138400 Conversion Kit Cover
Dexter AXLE Dexter K7138400 Conversion Kit

The Dexter AXLE Conversion Kit is designed to help you upgrade or maintain your axle with ease. It includes two spring seats, which provide a stable base for your vehicle’s suspension springs, ensuring a smooth ride. You’ll also find eight nuts that secure the components firmly, preventing loosening during use. Four U-bolts are included to clamp the axle tightly to the leaf springs, giving you reliable and safe performance. Additionally, two tie plates help distribute pressure evenly, reducing stress on the parts and extending their lifespan. This kit offers practical parts to keep your axle assembly strong and dependable.

What We Like
Complete axle hardware set
Durable U-bolts included
Stable spring seat support
Even pressure tie plates
#TOP 8

Rough Country 5/8 Round U-Bolts Set

7617
Black
12.5" x 3.625"
Rough Country 5/8 Round U-Bolts Set Cover
Rough Country 5/8 Round U-Bolts | 5/8 x 3.625 x 12.5-7617 Black

The Rough Country U-Bolts are built with strong steel to replace worn suspension parts, giving you a reliable and sturdy upgrade. Their black E-coating helps protect the bolts from rust and weather damage, so they last longer even in tough conditions. These U-bolts come in a size that fits perfectly for custom setups or replacements, making sure you get the right fit without hassle. Plus, they come in a set of four, allowing you to install them all at once. The installation usually takes just 2 to 3 hours, making it a convenient upgrade for your vehicle’s suspension system.

What We Like
Heavy-duty steel construction
Rust-resistant E-coated finish
Perfect custom fit size
Set of 4 for easy install
#TOP 9

Region Offroad Shock Bolts for Ram 1500-5500

Generic
6502818
Region Offroad Shock Bolts for Ram 1500-5500 Cover
Region Offroad Shock Bolts Compatible with Ram 1500 2500 3500 4500 5500 1994-2024

The Region Offroad Shock Bolts offer a strong upgrade over your factory parts. These bolts are designed with a full shoulder and are made from hardened 10.9 Class steel, giving you a tighter fit that helps reduce movement and wear on your shock bushings. This means your shocks will last longer and perform better. They are zinc plated for rust resistance and durability. Before buying, you should check if your Ram model and year match the fitment list to ensure compatibility. With these bolts, you’re swapping out the cheaper OEM parts for a more reliable and longer-lasting solution.

What We Like
Hardened 10.9 Class steel
Full shoulder design
Yellow zinc plating
Improved shock bushing protection
Specific fitment for Ram models
#TOP 10

Spicer 2-94-28X U-Bolt Kit

29428X
Gold
2 Count (Pack of 1)
Spicer 2-94-28X U-Bolt Kit Cover
Spicer 2-94-28X U-Bolt Kit

This is a genuine OE replacement Spicer U-Bolt Kit for axles. It is designed to fit the 1310 series and provides a secure and sturdy connection for your vehicle's drive shaft.

What We Like
Provides a secure and sturdy connection for your vehicle's drive shaft.
Designed to fit the 1310 series, making it easy to install.
Genuine OE replacement ensures the kit's quality and durability.
Buying Guide Image

Frequently Asked Questions (FAQs)

1. How do I know my U-bolt size?

And comes down to the axle where there's a plate to measure the length of the u-bolt. You'll go from

2. How tight should Trailer U-bolts be?

Tighten all U-Bolts until they are snug only. Tighten in the sequence shown to approximately 1/3 of recommended torque.

3. What happens if you reuse U-bolts?

Reason 2: Used U-bolts don't tighten the same as new U-bolts. The next issue with reusing U-bolts has to do with the threads themselves. When being tightened, the threads are deformed under the torque. Each time the U-bolt is tightened the threads are cut and grooved by the nut as the nut is tightened around them.

4. What are the different types of U-bolts?

What are the types of u bolts? U bolts are commonly classified by bending shape and can be divided into round U bolts, semi-round U bolt, and square U bolt. Each of the three models can be made of corrosion-resistant metals, such as carbon steel, 304 stainless steel, or 316 stainless steel.

Editor's Notes

During our axle u-bolt kit research, we found 24 axle u-bolt kit products and shortlisted 10 quality products. We collected and analyzed 13,385 customer reviews through our big data system to write the axle u-bolt kits list. We found that most customers choose axle u-bolt kits with an average price of $26.19.

The axle u-bolt kits are available for purchase. We have researched hundreds of brands and picked the top brands of axle u-bolt kits, including Allstar Performance, Rough Country, Dorman, LIBRA, DEXTER AXLE. The seller of top 1 product has received honest feedback from 384 consumers with an average rating of 4.7.

Written by
Robert Reyes Avatar

Robert Reyes is a dedicated writer from San Francisco with a bachelor of degree in mechanics and a bachelor of degree in marketing. He focuses on making some complicated topics simple and enjoys explaining complex and technical things in an easy-to-understand way.