U BOLTS, Truck spring bolt, Center bolt for truck

How to Install a U-Bolt
Follow these five steps to ensure your U-bolt is installed correctly.
Step 1: Remove the Nuts
The U-bolt will probably come with nuts attached to its threads. Start by taking the nuts off each side of the bolt.
Step 2: Position the U-Bolt
Place the U-bolt around the object you’re attaching to the beam or support. This object is usually piping or tubing.
Step 3: Examine Your Holes
Next, make sure you properly drill holes through the support structure. If you’ve drilled through the beam, make sure you haven’t damaged its protective coating. Cracks in the coating can lead to rusting around holes. At this stage, it’s smart to touch up the beam’s surface around holes before adding your bolts.
Step 4: Thread the Bolt Through
Push the two bolt ends through the holes and thread the nuts on each end of the U-bolt.
Step 5: Fasten the Nuts
It’s good to note that nut placement on a restraint will be different from a guide. If you’re working with a restraint, you’ll want to tighten the nuts on the bottom side of the beam.