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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 148 Matching Products
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  1. Equalizer Bolt
  2. Equalizers
  3. Leaf Spring Hanger
  4. Nut
  5. Nuts / Bolts
  1. Shackle Link
  2. Spring Bolt
  3. Spring Seat
  4. Tie Plates
  5. Torque Arm Bolt
  1. Trailer Spring Attaching Kit
  2. Trailer Spring Bushing
  3. Trailer U-Bolt
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SKU APTT3
$118.79

Redline Triple Axle Trailer Hanger Kit APTT3 is designed for use with 1-3/4 inch wide double eye spr...   Details

Typically ships in 3 to 4 business days.
  • Axle Type:Triple Axle
  • Spring Type:Double-Eye
  • Spring Width:1-3/4 inch
  • Front Hanger Height:1-1/2 inch
  • Rear Hanger Height:1-1/2 inch
  • Center Hanger Height:2-1/2 inch
  • Dimension A (in):24 3/4
  • Dimension B (in):29
  • Dimension C (in):24-3/4
  • Dimension D (in):28-1/2
  • Dimension E (in):4-1/2
  • Manufacturers Part Number:APTT3
  • Note:U-Bolts and spring are not included in hanger kits.
  • MPN: APTT3
SKU 175643
$3.05

The Redline U-bolt 175643 is designed to attach your round 1-3/4 inch diameter axle to your leaf spr...   Details

Typically ships in 3 to 4 business days.
  • FinishPlain
  • Bend:Round
  • Width:1-3/4 inch
  • Length:4-1/4 inch
  • Diameter:3/8 inch
  • Thread Size:24 per inch
  • Application:For 2,000 lbs. solid bar axles
  • Note:U-bolt plate and additional U-bolt (sold separately), required for leaf spring mounting to trailer frame.
  • MPN: 175643
SKU 175666
$8.49

The Redline U-bolt 175666 is designed to attach your round 3-1/2 inch diameter axle to your leaf spr...   Details

Typically ships in 3 to 4 business days.
  • FinishPlain
  • Bend:Round
  • Width:3-1/2 inch
  • Length:9 inch
  • Diameter:9/16 inch
  • Thread Size:18 per inch
  • Application:For 8,000 lbs. axles with 10 leaf spring
  • Note:U-bolt plate and additional U-bolt (sold separately), required for leaf spring mounting to trailer frame.
  • MPN: 175666
SKU 176400
$6.99

The Redline U-bolt 176400 is designed to attach your round 2-3/8 inch diameter axle to your leaf spr...   Details

Typically ships in 3 to 4 business days.
  • 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
  • Note:U-bolt plate and additional U-bolt (sold separately), required for leaf spring mounting to trailer frame.
  • MPN: 176400
SKU 30-28
$16.75

Leaf spring hanger for 2 inch slipper trailer springs.   Details

Typically ships in 3 to 4 business days.
  • Spring Width:2 inches
  • Location:Rear
  • Top to Center of Hole:5-3/8 inches
  • Bolt Diameter:5/16 inch
  • MPN: 30-28
SKU 382385UB
$11.95

The Redline U-bolt kit 382385UB is designed to simplify attachment of hardware to square trailer fra...   Details

Typically ships in 3 to 4 business days.
  • FinishZinc
  • Bend:Square
  • Width:2-3/8 inch
  • Length:5-1/4 inch
  • Diameter:3/8 inch
  • MPN: 382385UB
SKU 38N
$0.22

Redline 3/8 inch diameter hex nut is designed for use with U-bolts, brake bolts, center bolts and ma...   Details

Typically ships in 3 to 4 business days.
  • Size:3/8 inch
  • Thread Size:24 per inch
  • FinishPlain
  • MPN: 38N
SKU 721585
$17.93

Leaf spring hanger for 2 inch wide slipper trailer springs.   Details

Typically ships in 3 to 4 business days.
  • Spring Width:2 inches
  • Location:Rear
  • Top to Center of Hole:5-1/16 inches
  • Bolt Diameter:9/16 inch
  • MPN: 721585
SKU 93003-3X
$4.86

Leaf spring hanger for 1-3/4 inch wide double-eye trailer leaf springs with 9/16 inch spring eye.   Details

Typically ships in 3 to 4 business days.
  • Spring Width:1-3/4 inches
  • Location:Rear
  • Top to Center of Hole:1-1/4 inches
  • Bolt Diameter:9/16 inch
  • Note:Single Axle use Only, No bushing.
  • MPN: 93003-3X
SKU 93400506
$8.43

Lock Nut. 1-1/8 inch - 7 UNC threads. 0.975 inch height, A/F/ 1.675 inch.   Details

Typically ships in 10 to 14 business days.
  • Size:1-1/8"-7
  • Thread Type:UNC
  • Automann Number:LNC107A
  • Euclid Number:E4358, E-4358
  • Hutch Number:1115400, 1115401
  • Kenworth Number:K169141182, K169141182CA
  • Meritor Number:R304358
  • Neway Number:9300506, 93400506
  • Volvo / White Number:3915393
  • Note:Price per nut (1)
  • UPC: 889626160288
  • MPN: 93400506
SKU APTT5
$81.50

Redline Triple Axle Trailer Hanger Kit APTT5 is designed for use with 1-3/4 inch wide double eye spr...   Details

Typically ships in 3 to 4 business days.
  • Axle Type:Triple Axle
  • Spring Type:Double-Eye
  • Spring Width:1-3/4 inch
  • Front Hanger Height:3-1/4 inch
  • Rear Hanger Height:3-1/4 inch
  • Center Hanger Height:3-1/4 inch
  • Dimension A (in):24-3/4
  • Dimension B (in):29
  • Dimension C (in):24-3/4
  • Dimension D (in):28-1/2
  • Dimension E (in):4-1/2
  • Manufacturers Part Number:APTT5
  • Note:U-Bolts and spring are not included in hanger kits.
  • MPN: APTT5
SKU APTT6SE
$184.21

Redline Triple Axle Trailer Hanger Kit APTT6SE is designed for use with 2 inch wide Slipper Springs.   Details

Typically ships in 3 to 4 business days.
  • Axle Type:Triple Axle
  • Spring Type:Slipper
  • Spring Width:2 inch
  • Front Hanger Height:3-9/16 inch
  • Rear Hanger Height:5-1/16 inch
  • Center Hanger Height:3-3/8 inch
  • Dimension A (in):29
  • Dimension B (in):33-1/2
  • Dimension C (in):29
  • Dimension D (in):33-1/2
  • Dimension E (in):4-3/4
  • Manufacturers Part Number:APTT6SE
  • Note:U-Bolts and spring are not included in hanger kits.
  • MPN: APTT6SE

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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