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Atlas Automotive Arrow U-Bolts
U-Bolts
U-Bolts are a very important part of your suspension.
  • The U-bolt is the binding link between the axle and the vehicle.
  • The U-bolt and center bolt provide a permanent tie between the spring leaves.

These functions can best be performed by proper U-Bolt maintenance.
  • The U-bolt nuts must be kept tight. After replacing they should be re-torqued within 500 miles to accommodate settling of the springs.
  • U-bolts should never be re-used. A U-bolt will stretch under torque, and after removed its ability to sustain torque can be diminished.

Why use L&H Threaded U-Bolt Rod?
  • L&H has strength equal to or greater than SAE minimums for Grade-8 fasteners.
  • L&H threads are rolled, not cut, for superior thread and torque retention.
  • Many OEM’s specify L&H’s exceptional strength and superior forming.
  • L&H is cold formed, not heated, which eliminates scaling, quench cracks and warped twisted legs associated with Grade 8 heat treated bolts.

U-Bolt Identification
Five items we will need to know to bend the proper u-bolt.
  • Special application u-bolts- Forged or flat top-Mack, Neway, Hutch, etc.
  • Size of u-bolt stock –“A3/8, 7/16, 1/2, 9/16, 5/8, 3/4, 7/8, 1, 1-1/8, and 1-1/4.
  • Type of bend – Round, semi-round or squares (see illustration below.) Watch for special bends – Hendrickson 4", Chevrolet 2-9/16, 3-1/16,4-1/16.
  • Width of u-bolt – “B” Measurement in illustration.
  • Length of u-bolt - "C" Measurement in illustration.

Forged Top U-bolts
Forged Top U-bolts
Regular U-bolts
Regular U-bolts

 

Suggested Torque Values for U-bolts

 

Size                ft-lbs (Grade)

3/8”                 30     (5)

7/16”               45     (5)

½”                    65     (5)

9/16”               90     (5)

5/8”                 120   (5)  170  (8)

¾”                    215   (5)  300  (8)

7/8”                 345   (5)  480  (8)

1”                    740   (8)

1-1/8”              1300 (8)

1-1/4”              1780 (8)

 

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