Stengel Bros. Inc.
Axle U bolts can be shipped anywhere by UPS

610-433-3149
Email:ProductSupport

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Leaf Spring and Suspension U-Bolts

Order U-bolt kits online.  Each U-bolt kit has two U-bolts with nuts and washers.  We also make custom U-bolts (small and large orders).  

To order online kits, click the type of U-bolt that you need. Find the U-bolt kit based on dimensions.  Use our U-bolt Inquire Form to find out pricing of U-bolt sizes not listed in our standard kits.  We also provide discount on large order U-bolt orders (bulk pricing)  --> enter you information in the U-bolt form to get pricing.

suspensio round u-bolts  truck square suspension u bolts  semi-round u-bolts   custom u bolts and forged top round U-bolts  custom u bolts and Forged Top Square U-bolts  Semi-Round Forged Top U-bolt

bullet How to Measure a U-bolt
bullet U-bolt Diameter Determination
bullet U-bolts Torque Requirements 
bullet U-bolt Torque Pattern

LEAF SPRINGS FOR ALL MODEL TRUCKS/ HEAVY DUTY LEAF SPRINGS

 

u bolts and u-bolts

A U-bolt serves in four critical related roles:

• Primarily, the truck u-bolts provide the force required to clamp the leaf spring and  related components firmly together. In addition to the leaf spring, these  components include the top plate, axle seat, axle and bottom plate.

• The properly installed u-bolt eliminates any flexing of the leaf spring in the area between the u bolts. This is particularly critical since the hole for the centerbolt  in each leaf acts as a stress concentration which would lead to rapid leaf  breakage if spring flexing was not totally eliminated by the U bolt clamping force.

• By firmly clamping the spring to the axle seat the horizontal forces acting on the centerbolt are greatly reduced which in turn prevents shearing of the centerbolt.

• Proper clamping of the spring by the truck u-bolts provides the desired spring stiffness  and contributes to maintaining the vehicle ride height and handling characteristics as originally specified for the vehicle.

 

   
how to measure u bolts

 

  How to measure a Leaf Spring U-bolts

Regardless of the bend type, all Leaf Spring U-bolts are measured in the same manner as shown here. The U-bolt size is given as 

 Diameter (A) x Distance Between Legs (B)  x Leg  Length (C). 

Additionally the bend type must also be specified; either round, semi-round or square.

 

      

         Do not reuse auto or truck Leaf Spring U bolts

  • Used U-bolts will have rusted and damaged threads from the previous installation.

  • A previously torqued U-bolt will suffer from distorted threads from the engagement of the deep nut.  Deep nuts should be tightened once and re-torqued, never loosened and retightened.

   • A used u bolt may have suffered from fatigue as well excessive stress since achieving accurate torque with commonly used impact wrenches is very difficult.     

  

       Rod/U-bolt Diameter Determination

Socket to Rod Size Chart

Socket Size

Rod Diameter

11/16"

7/16"

3/4"

1/2"

13/16" or 7/8"

9/16"

15/16"

5/8"

1 1/16" or 1 1/8"

3/4"

1 15/16"

7/8"

 

  Torque Requirements

 

      

 U-bolt Torque Pattern

U bolts must be tightened and torqued using a cross pattern sequence

      -Tighten #1 then #4 to partial torque then partial torque #2 and #3

        -Using the same sequence, fully torque U-bolt Nuts

U bolts that have been torqued to a set preload are recommended to be re-torqued after a short time to take-up the stretch in the set of the material.

 

Please use our Contact Form to request pricing on special u bolts for your vehicle or application.

                 

Stengel Bros. Inc.
WE SHIP UPS ANYWHERE
ACCEPT ALL MAJOR CREDIT CARDS 
Copyright (c) 2001 Stengel Brothers Inc.

1105 Sumner Ave
Whitehall, PA  18052
610-433-3149

Email:ProductSupport