What is the torque specs for U-bolts?
Recommended U-Bolt Torque for Cold-Formed U-Bolts
| Size | Material Grade | Max. Torque Ft. Lbs. Unplated |
|---|---|---|
| 1/2 – 20 | 5 | 70 |
| 9/16 – 18 | 5 | 100 |
| 5/8 – 18 | 8 | 177 |
| 3/4 – 16 | 8 | 313 |
What should leaf spring U-bolts be torqued to?
view full answer… What Torque Should Be Used For U-Bolt Nuts On Trailer Suspension If the U-bolts are 9/16 inch diameter, the torque specs should be between 65 to 95 foot lbs. If the U-bolts are 3/8 inch diameter, the torque should be between 30 and 50 foot lbs.
How tight should suspension U-bolts be?
Tighten all U-Bolts until they are snug only. Tighten in the sequence shown to approximately 1/3 of recommended torque.
Are U-bolts torque to yield?
U-bolts are a torque to yield bolt. This means when you tighten down a U-bolt to its proper torque spec, the bolt stretches to achieve that level of tightness.
What is the torque for a half inch U-bolt?
45ft/lbs-70ft/lbs
The torque specs for a 1/2″ u-bolts which is the size most frequently used on Venture Trailers is 45ft/lbs-70ft/lbs.
Why would u-bolts have to be tightened correctly?
centre bolts hold the spring together for assembly and help locate the spring onto the axle in the correct position. Correctly tightened ubolts are what holds the springs firmly in place on the vehicle when driving.
When should the u-bolts on a spring suspension be re torqued after installation?
Also, TMC recommends running the truck on a course where maximum articulation of the suspension occurs after installation, then loading the suspension before retorqueing the U-bolts. They should be retorqued again between 3,000 and 5,000 miles after replacement.
How much torque does a 1/2 inch bolt have?
US Recommended Bolt Torque
| Size | Recommended Torque | |
|---|---|---|
| Grade 2 | 18-8 S/S | |
| 1/2″ | 37 | 45 |
| 9/16″ | 53 | 63 |
| 5/8″ | 73 | 104 |
What is the torque for 1/2 inch U-bolt?
When should the U-bolts on a spring suspension be re torqued after installation?
Is it safe to reuse U-bolts on leaf springs?
Cut thread U-bolts are never a good idea to use because the threads tend to strip. Additionally, this means the U-bolts won’t be able to achieve near the torque spec that a rolled thread U-bolt can. The smallest amount of looseness or vibration in your U-bolts will allow for movement between your axle and leaf springs.
How tight should leaf spring shackles be?
How Tight Should Leaf Spring Shackle and Spring Eye Bolts Be If the bolts for the shackle link and the leaf spring eye are too tight, the suspension won’t articulate as it should. You want to run the bolt down tight, then back it off by a 1/4 turn, as you’d mentioned.
Can you over tighten leaf springs?
Tightening the shackle bolts too much will squeeze the shackle straps against the leaf springs and the whole suspension system will bind and cause problems. The best thing to do when tightening down shackle bolts is to use lock nuts and tighten them until they are snug and then backed off 1/4 turn.
Can loose U-bolts cause vibration?
By definition, an under-tightened bolt is already loose and the joint does not have enough clamp force to hold the individual sections together. This can lead to sideways slippage between sections, placing unwanted shear stress on the bolt that could eventually cause it to break. Vibration.
Why would U-bolts have to be tightened correctly?
Why are U-bolts one time use?