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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.

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SKU C580312
$2.06

Spring bolt, 3-1/2 inch length, 5/8 inch threads. Use with SLN1011 lock nut.   Details

20+ In Stock as of September 10, 2021 7:31 AM EST.
  • Application:Use with SLN1011 lock nut.
  • Automann Number:C580312GR8
  • Freightliner Number:2309444350, 23-09444-350
  • MPN: C580312
SKU 175211
$7.14

The Redline 175211 U-bolt is designed to attach your square 2 inch wide axle to your leaf springs.   Details

12 In Stock as of September 10, 2021 7:39 AM EST.
  • FinishPlain
  • Bend:Square
  • Width:2 inch
  • Length:5-3/4 inch
  • Diameter:9/16 inch
  • Thread Size:18 per inch
  • Note:U-bolt plate and additional U-bolt (sold separately), required for leaf spring mounting to trailer frame.
  • MPN: 175211
SKU 1755892
$6.99

The Redline U-bolt 1755892 is designed to attach your round 3 inch diameter axle to your leaf spring...   Details

4 In Stock as of September 10, 2021 7:39 AM EST.
  • FinishPlain
  • Bend:Round
  • Width:3 inch
  • Length:7 inch
  • Diameter:1/2 inch
  • Thread Size:20 per inch
  • Application:For 5,200, 6,000 and 7,000 lbs. axles
  • Note:U-bolt plate and additional U-bolt (sold separately), required for leaf spring mounting to trailer frame.
  • MPN: 1755892
SKU 916N
$0.73

Redline 9/16 inch hex nut is designed for use with U-bolts and other applications.   Details

20+ In Stock as of September 10, 2021 7:23 AM EST.
  • Size:9/16 inch
  • Thread Size:18 per inch
  • FinishPlain
  • MPN: 916N
SKU APUBR-1
$22.79

The Redline U-bolt Kit APUBR-1 is designed to attach your trailer's leaf springs to your round, 2-3/...   Details

9 In Stock as of September 10, 2021 7:39 AM EST.
  • FinishPlain
  • Bend:Round
  • Width:2-3/8 inch
  • Length:5-1/2 inch
  • Diameter:1/2 inch
  • Thread Size:20 per inch
  • Application:For 3,500 lbs. axles
  • MPN: APUBR-1
SKU F100600
$9.50

Grade 8 hex bolt. 6 inches length, 1 inch - 14 threads.   Details

20+ In Stock as of September 10, 2021 7:08 AM EST.
  • Application:Universal
  • Thread Type:Fine
  • Grade:8
  • Automann Number:F100600GR8
  • MPN: F100600
SKU SLN1614
$3.32

1"-14 SAE Stover Lock nut. Fine thread.   Details

20+ In Stock as of September 10, 2021 7:26 AM EST.
  • Thread Type:Fine
  • Note:Price per nut (1)
    Product may vary from image shown.
  • MPN: SLN1614
SKU SLN616
$0.42

3/8"-16 SAE Stover Lock nut. Coarse thread.   Details

20+ In Stock as of September 10, 2021 7:26 AM EST.
  • Thread Type:Course
  • Note:Price per nut (1)
    Product may vary from image shown.
  • MPN: SLN616
SKU APUBR-8
$22.95

The Redline U-bolt Kit APUBR-8 is designed to attach your trailer's leaf springs to your round, 3 in...   Details

1 In Stock as of September 10, 2021 7:39 AM EST.
  • FinishPlain
  • Bend:Round
  • Width:3 inch
  • Length:7 inch
  • Diameter:1/2 inch
  • Thread Size:20 per inch
  • Application:For 5,200 to 7,000 pound axles
  • MPN: APUBR-8
SKU 175130
$9.49

The Redline U-bolt 175130 is designed to attach your square 1-3/4 inch diameter axle to your leaf sp...   Details

4 In Stock as of September 10, 2021 7:39 AM EST.
  • FinishPlain
  • Bend:Square
  • Width:1-3/4 inch
  • Length:5 inch
  • Diameter:9/16 inch
  • Thread Size:18 per inch
  • Application:For 1-3/4 inch square tubing
  • Note:U-bolt plate and additional U-bolt (sold separately), required for leaf spring mounting to trailer frame.
  • MPN: 175130
SKU 29-8
$3.38

Leaf spring hanger for 1-3/4 inch double-eye trailer leaf springs.   Details

8 In Stock as of September 10, 2021 7:16 AM EST.
  • Location:Front, Rear
  • Top to Center of Hole:2.00 inch
  • Bolt Diameter:9/16 inch
  • Dexter Number:028-008-00
  • MPN: 29-8
SKU 381344UB
$16.95

The Redline U-bolt kit 381344UB is designed to simplify attachment of hardware to square trailer fra...   Details

2 In Stock as of September 10, 2021 7:39 AM EST.
  • FinishZinc
  • Bend:Square
  • Width:1-1/3 inch
  • Length:4 inch
  • Diameter:3/8 inch
  • MPN: 381344UB

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.

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