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When your trailer carries serious weight, you need hardware that won’t flex or loosen under pressure. This kit uses (4) 1/2"-20 steel U-bolts that clamp your 3" round axle tight to the leaf springs. Each bolt is 7" long, giving enough thread for a secure fit on typical 5,200-lb to 7,000-lb axles. The solid connection keeps your suspension stable and your load steady mile after mile.
Matching parts by eye can lead to headaches later. This kit includes (2) U-bolt plates sized for 1-3/4" wide springs, so everything lines up cleanly. The geometry between the axle and spring is locked in, keeping the setup aligned and the ride controlled over bumps and uneven road surfaces.
No need to track down extra hardware. The kit comes complete with (4) 7" long U-bolts, (2) U-bolt plates, and (8) 1/2"-20 hex nuts. That means you can bolt the axle to the springs right out of the box without hunting for compatible parts. It’s a straightforward, ready-to-install setup that makes suspension work simple and solid.
A proper clamp load keeps your axle tight and your suspension quiet. These 1/2"-20 U-bolts are designed to be torqued between 45 ft-lbs and 70 ft-lbs, with 70 ft-lbs being the standard setting for a firm, lasting hold. When tightened to spec, the connection stays put through vibration, rough pavement, and long-haul use.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi, everybody, Andy here with etrailer.com. Let's take a look together at this Dexter U-Bolt Kit for mounting 5,200 to 7,000-pound round trailer axles. Now this kit is designed to fit axle diameters of three inches, which is going to be your typical 5,200 to 7,000-pound axles. And this kit includes everything that you see here on my table before me. You're going to receive four seven-inch long U-bolts and then two U-bolt plates for 1 3/4-inch or two-inch springs, and then eight 1/2 inch by 20 nuts. And the spring seats.
Spring seats are required for mounting the axle to the leaf springs, and those are gonna be sold separately from this kit. Now, if we measure from the inside of the U-bolt to the bottom of the bolt post, that's gonna give us our seven-inch measurement. And these are tapered where the axle sits to help the U-bolt stay in place on your axle. And the area between the bolt post measure three inches. So that's where we are...
That's where we get the spring width fitting from. And then the diameter of each one of these bolts measure half an inch. And of course, the plates that are included are designed to fit these U-bolts. Well, that's gonna wrap up our look today. I do hope that it was helpful for you.
Again, my name is Andy, thank you for joining me.
Customer Satisfaction Score:
95% were satisfied with this product
5% of customers were not satisfied
Ratings & Reviews
Horse C.
11/26/2025
After a year the parts and the horse trailer are still road worthy and pass state inspection with no issues. I continue to be pleased with the quality of the parts. and the
Brooke M.
6/26/2025
Really glad to hear that! Looks like you handled install like a pro! Are you a pro in real life?
Jenny N.
4/22/2022
I do have two recommendations for you. The first would be to make sure that the bolts are not over tightened. The locknuts should only be tight enough to limit as much movement as possible without binding anything up. The second recommendation is that Lippert makes that can be used with the Equa-Flex system. It is part # LC64FR. The shackle straps are less thick at 0.212 thickness however they are longer at 3 and one quarter inches.
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Gwendolyn Y.
4/23/2026
Thanks so much for the kind words, Scott! We’re really glad everything came together smoothly with your new setup. I’ll be sure to pass your shoutout along to Lauren, she’ll appreciate it!