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U-Bolts

U-Bolts

We maintain a complete stock of leaf spring u-bolts for light, medium, and heavy duty trucks and trailers. Don’t see the size you need? We can custom bend u-bolts for every type of vehicle. We only use material that is cold drawn, stress relieved, micro-alloyed, 1541 modified steel in our u-bolt kits.

Found 411 Matching Products
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Grid List
v
SKU 5-0920K
$19.86
Leaf Spring U Bolt Kit | Round | Grade 5 | 9/16 x 3 x 8-3/4

Round U-Bolt Kit with 2 Grade 5 U-Bolts that are 9/16 inches in diameter, 3 inches wide and 8-3/4 in...   Details

Typically ships in 5 to 7 business days.
  • Rod Length:20"
  • Diameter (A):9/16"
  • Bend:Round
  • Grade:5
  • Width (B):3"
  • Length (C):8-3/4"
  • Note:Generic Images
  • MPN: 5-0920K
SKU 5-0816K
$16.13
Leaf Spring U Bolt Kit | Round | Grade 5 | 1/2 x 3 x 6-3/4

Round U-Bolt Kit with 2 Grade 5 U-bolts that are 1/2 inches in diameter, 3 inches wide and 6-3/4 inc...   Details

Typically ships in 5 to 7 business days.
  • Rod Length:16"
  • Diameter (A):1/2"
  • Bend:Round
  • Grade:5
  • Width (B):3"
  • Length (C):6-3/4"
  • Note:Generic Images
  • MPN: 5-0816K
SKU 361-450
$14.94
Leaf Spring U Bolt Kit | Round | Grade 5 | 1/2 x 2-7/8 x 6-7/8

Round U-Bolt Kit with 2 Grade 5 U-bolts that are 1/2 inches in diameter, 2-7/8 inches wide and 6-7/8...   Details

Typically ships in 3 to 4 business days.
  • Diameter (A):1/2"
  • Bend:Round
  • Grade:5
  • Width (B):2-7/8"
  • Length (C):6-7/8"
  • Note:Generic Images
  • MPN: 361-450
SKU 361-161
$24.94
Leaf Spring U Bolt Kit | Square | Grade 8 | 3/4 x 4 x 5-7/8

Square U-Bolt Kit with 2 Grade 8 U-bolts that are 3/4 inches in diameter, 4 inches wide and 5-7/8 in...   Details

4 In Stock as of September 10, 2021 7:26 AM EST.
  • Diameter (A):3/4"
  • Bend:Square
  • Grade:8
  • Width (B):4"
  • Length (C):5-7/8"
  • Note:Generic Images
  • MPN: 361-161
SKU 8-14180K
$66.74
Leaf Spring U Bolt Kit | Semi-Round | Grade 8 | 7/8 x 3 x 20-1/8 | GMC

Semi-Round U-Bolt Kit with 2 Grade 8 U-Bolts that are 7/8 inches in diameter, 3 inches wide and 20-1...   Details

Typically ships in 5 to 7 business days.
  • Application:GMC
  • Rod Length:44"
  • Diameter (A):7/8"
  • Bend:Semi-Round
  • Grade:8
  • Width (B):3"
  • Length (C):20-1/8"
  • Note:Generic Images
  • MPN: 8-14180K
SKU 361-416
$32.44
Leaf Spring U Bolt Kit | Round | Grade 8 | 5/8 x 3-1/2 x 8-5/8

Round U-Bolt Kit with 2 Grade 8 U-bolts that are 5/8 inches in diameter, 3-1/2 inches wide and 8-5/8...   Details

Typically ships in 3 to 4 business days.
  • Diameter (A):5/8"
  • Bend:Round
  • Grade:8
  • Width (B):3-1/2"
  • Length (C):8-5/8"
  • Note:Generic Images
  • MPN: 361-416
SKU 361-464
$13.69
Leaf Spring U Bolt Kit | Semi-Round | Grade 5 | 1/2 x 2-9/16 x 6-7/8

Semi-Round U-Bolt Kit with 2 Grade 5 U-bolts that are 1/2 inches in diameter, 2-9/16 inches wide and...   Details

Typically ships in 3 to 4 business days.
  • Diameter (A):1/2"
  • Bend:Semi-Round
  • Grade:5
  • Width (B):2-9/16"
  • Length (C):6-7/8"
  • Note:Generic Images
  • MPN: 361-464
SKU 361-454
$26.19
Leaf Spring U Bolt Kit | Square | Grade 8 | 5/8 x 2-5/16 x 11-3/4

Square U-Bolt Kit with 2 Grade 8 U-bolts that are 5/8 inches in diameter, 2-5/16 inches wide and 11-...   Details

Typically ships in 3 to 4 business days.
  • Diameter (A):5/8"
  • Bend:Square
  • Grade:8
  • Width (B):2-5/16"
  • Length (C):11-3/4"
  • Note:Generic Images
  • MPN: 361-454
SKU 8-1255K
$38.66
Leaf Spring U Bolt Kit | Round | Grade 8 | 3/4 x 5 x 11

Round U-Bolt Kit with 2 Grade 8 U-Bolts that are 3/4 inches in diameter, 5 inches wide and 11 inches...   Details

Typically ships in 5 to 7 business days.
  • Rod Length:26"
  • Diameter (A):3/4"
  • Bend:Round
  • Grade:8
  • Width (B):5"
  • Length (C):11"
  • Note:Generic Images
  • MPN: 8-1255K
SKU 361-421
$27.44
Leaf Spring U Bolt Kit | Semi-Round | Grade 8 | 3/4 x 2-9/16 x 13-5/8

Semi-Round U-Bolt Kit with 2 Grade 8 U-bolts that are 3/4 inches in diameter, 2-9/16 inches wide and...   Details

Typically ships in 3 to 4 business days.
  • Diameter (A):3/4"
  • Bend:Semi-Round
  • Grade:8
  • Width (B):2-9/16"
  • Length (C):13-5/8"
  • Note:Generic Images
  • MPN: 361-421
SKU 8-1280K
$50.35
Leaf Spring U Bolt Kit | Square | Grade 8 | 3/4 x 3-1/2 x 18

Square U-Bolt Kit with 2 Grade 8 U-Bolts that are 3/4 inches in diameter, 3-1/2 inches wide and 18 i...   Details

Typically ships in 5 to 7 business days.
  • Rod Length:40"
  • Diameter (A):3/4"
  • Bend:Square
  • Corner Radius:0.500
  • Grade:8
  • Width (B):3-1/2"
  • Length (C):18"
  • Note:Generic Images
  • MPN: 8-1280K
SKU 8-1435K
$60.01
Leaf Spring U Bolt Kit | Round | Grade 8 | 7/8 x 4 x 17-1/4

Round U-Bolt Kit with 2 Grade 8 U-Bolts that are 7/8 inches in diameter, 4 inches wide and 17-1/4 in...   Details

Typically ships in 5 to 7 business days.
  • Rod Length:38"
  • Diameter (A):7/8"
  • Bend:Round
  • Grade:8
  • Width (B):4"
  • Length (C):17-1/4"
  • Note:Generic Images
  • MPN: 8-1435K

How do I measure a Leaf Spring U-Bolt?

Truck and trailer leaf spring u-bolts come in all different dimensions, widths and lengths and many are custom bent, so getting your measurements correct is key.

Here is a video on how to measure U-Bolts. How To Measure Leaf Spring U-Bolts
type of ubolt bends

Step 1: Type of Bend

The typical U-bolt is rounded just like the letter "U". Yet there are a number of different of U-bolt types. The three primary types of bends are round, square and semi-round. Your vehicle's leaf spring suspension style and the shape of its parts will determine which type of bend is necessary. We do stock other types of u-bolts like Forged Bend, but they are not as common.

how to measure a u-bolt

Step 2: Rod Diameter

After you determine the bend you need, measure the rod diameter (A). The diameter can easily be measured with a wrench.

The socket sizes below will help to determine your rod size.

  • 11/16 socket = 7/16” diameter rod
  • 3/4 socket = 1/2” diameter rod
  • 13/16, 7/8 or 22mm socket = 9/16” diameter rod
  • 15/16 socket = 5/8” diameter rod
  • 1-1/16 or 1-1/8 socket = 3/4” diameter rod
  • 1-5/16 socket = 7/8” diameter rod

Step 3: Length and Width

Measure the inside width (B) and the length (C) of the U-bolt legs as well. With this information in-hand, you will be well on your way to a quick and easy U-bolt installation.

What is a Leaf Spring U-Bolt and What Does It Do?

leaf spring ubolt installed

If you haven't heard of a leaf spring U-bolt, you are not alone. Most people have no idea what type of function this little part plays in the average truck's operation. Truck U-bolts are used within vehicle suspension to connect leaf springs. They offer the force that is necessary to clamp the leaf spring along with its related components to one another, providing a lasting attachment to the axle.

A firm u-bolt connection allows vehicles to maintain their ride height as well as their handling. The horizontal pressure placed on the center bolt is significantly offset when the spring is firmly connected to the axle seat. This allows for the preservation of the center bolt for extended operational purposes. When installed just right, U-bolts will help eliminate spring flexing.

Tight u-bolts help prevent broken leaf springs. For more information, read this article on broken leaf springs and what causes leaf springs to fail. You can do your truck an enormous favor by having your leaf spring u-bolts inspected during your next service maintenance appointment.

Why Your Truck or Trailer U-Bolts Must be Replaced

As time progresses, U-Bolts rust and lose their shape, making the leaf springs fail to properly contact with other components. Or, they can simply loosen over time. U-bolts should also be replaced due to the fact that they wear throughout the course of the vehicle's operation. Stretching occurs with each drive and time takes its toll on all parts, including the leaf spring, U-bolt and beyond.

Truck owners should also know that U-bolt threads are damaged as their threads stretch when connecting to Hi-Nuts. Though it is not seen with the naked eye, this contact really does cause damage. Replacing them ensures that they will provide adequate clamping force that safeguards against spring failure and other harm to the suspension. Vehicle owners are not encouraged to reuse their U-bolts beyond the initial use. U-bolts lose their effectiveness in a gradual manner as their threads stretch when coming into contact with Hi-Nuts with each successive use of the truck. There is no getting around the fact that every truck owner should change his vehicle's U-bolts when replacing leaf springs to prevent damage and prevent a potentially bigger and more expensive problem from arising down the road.

Most at home mechanics can replace leaf spring u-bolts without any troubles. We have a few tips to help you along the way. Read more.

We stock forged top ubolts, square u bolts, round ubolts, and semi-round u-bolts for all types of truck and trailer applications made of the finest grade 5 and grade 8 steel. Can't find the ubolts that meet your requirements? Call us at 1-800-358-4751. We can custom bend u-bolts to your specifications, and in most cases, ship the same day.

U-Bolts Reviews

Out of 15 reviews, the average customer rating for U-Bolts: 4.9 out of 5.

u-bolt kit 5-0995k reviewer
U-Bolts - L&H 5-0995K Rating: 5 Stars

Yes

very pleased with my purchace and michigan spring

Read the Review

round u-bolt kit – grade 8 - 5/8 x 3-1/2 x 11-1/2 8-1038k reviewer
U-Bolts - L&H 8-1038K Rating: 5 Stars

Would Buy Again

Best price around. Shipping was decent. Will shop here again when I need more

Read the Review

round u-bolt kit - grade 5 - 1/2 x 3 x 6-3/4 5-0816k reviewer
U-Bolts - L&H 5-0816K Rating: 5 Stars

Great Product, Great Service

Very high quality product, ease of shopping, and super fast shipping. Thank you!

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round u-bolt kit – grade 8 - 5/8 x 3 x 9-5/8 8-1024k reviewer
U-Bolts - L&H 8-1024K Rating: 5 Stars

Chevrolet C 50 Project Truck

courteous and helpfull service team quick shipping and quality products, custom 67 chevrolet c50 truck rolls on your products keep up the great service

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3/4 x 2-9/16 x 12-1/2 inch - square u-bolt kit 361-422 reviewer
U-Bolts - Dayton 361-422 Rating: 5 Stars

Spring U Bolts Entry

High quality spring bolts. Fast shipping. Looking forward to winning the !

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round u-bolt kit – grade 5 - 1/2 x 3 x 7-3/4 5-0818k reviewer
U-Bolts - L&H 5-0818K Rating: 5 Stars

Fast Shipping Quality Products

Fast shipping. Used the new U bolts to lift my RV. Work like advertised!

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round u-bolt kit – grade 8 - 5/8 x 3-1/2 x 11-1/2 8-1038k reviewer
U-Bolts - L&H 8-1038K Rating: 5 Stars

Quality Workmanship

outstanding

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round u-bolt kit – grade 5 - 1/2 x 3 x 7-3/4 5-0818k reviewer
U-Bolts - L&H 5-0818K Rating: 5 Stars

Excellent U Bolts

Used these to bolt up a Ford 9" rear axle to my '75 Jeep rock crawler

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round u-bolt kit – grade 5 - 1/2 x 3 x 7-3/4 5-0818k reviewer
U-Bolts - L&H 5-0818K Rating: 5 Stars

Amazing U Bolts

Used these for my jeep cj5 rock crawler that I installed a Ford 9" rear axle. The quality is amazing and the price is the best. Won't use any other companies bolts from here on out.

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round u-bolt kit - grade 5 - 1/2 x 3 x 6-3/4 5-0816k reviewer
U-Bolts - L&H 5-0816K Rating: 5 Stars

Threads Long Enough To Alow Tighting

only place I could find these. Answered my questions quick and with all the specs.

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round u-bolt kit – grade 5 - 9/16 x 3 x 9-3/4 5-0922k reviewer
U-Bolts - L&H 5-0922K Rating: 5 Stars

Perfict Fit

The reason i like this product so much is more to the company having the available part when others didn't. I needed the part fast and got nowhere with other companies and this company gave the details i wanted to know i was buying the right bolt for the suspension i was installing.

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semi-round u-bolt kit – grade 8 - 3/4 x 4 x 7 8-12260k reviewer
U-Bolts - L&H 8-12260K Rating: 3 Stars

Quality Problems

The first batch that I ordered were perfect. They matched up with pre-drilled holes in heavy metal perfectly. The second batch that I ordered had quality control issues as the threaded ends were off by as much as 1/4 inch, requiring much drilling and grinding to use.

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square u-bolt kit – grade 8 - 5/8 x 2-9/16 x 9-3/8 8-1008k reviewer
U-Bolts - L&H 8-1008K Rating: 5 Stars

Ubolts

They have a great selection of ubolts at fair prices

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round u-bolt kit – grade 8 - 3/4 x 3-1/2 x 8-1/2 8-1228k reviewer
U-Bolts - L&H 8-1228K Rating: 5 Stars

Solid Product

Perfect replacement for my 67 Chevy C-10 rear axle U-bolts.

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round u-bolt kit – grade 8 - 5/8 x 3-1/2 x 11-1/2 8-1038k reviewer
U-Bolts - L&H 8-1038K Rating: 5 Stars

What I Expected. Good Quality

I'm using this product for a offroad project. I had a difficult time finding the correct product until i found your website. Product fit perfect.

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