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A loose axle can turn into a rough ride fast. This replacement U-bolt clamps your 1-1/2" wide, square axle solidly to the leaf spring using a U-bolt plate and another matching U-bolt. Built from 1/2"-13 diameter steel with a raw finish, it’s made to handle the job on 3,500-lb axles. At 5" long with an inner width of 1-1/2" and 2" between bolt ends on center, it fits cleanly and holds steady through miles of towing.
When factory U-bolts corrode or stretch, suspension alignment suffers. This exact replacement brings the setup back to spec so your axle and spring stay aligned and secure. It’s built as part of a standard trailer suspension system—just pair it with a U-bolt plate (not included) and another matching U-bolt to lock everything in place.
No hunting around for hardware. This U-bolt comes complete with matching nuts sized for its 1/2" threading, giving you everything needed to fasten one side of your axle to the spring pack. With proper torque between 45 and 70 ft-lbs, the connection stays snug and reliable mile after mile.
The raw finish makes it flexible for any setup—paint, coat, or install as is. Whether you’re refreshing worn suspension parts or finishing a custom build, this solid steel U-bolt gives you a dependable way to keep your square axle clamped tight.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today, we're going to be taking a look at a replacement U-bolt with nuts for 1 1/2" wide square trailer axles. You would use the U-bolt with a U-bolt plate and an additional U-bolt with the same dimensions to secure an axle to the leaf springs, which are mounted to the trailer frame. This is going to feature a threaded portion on each end. That threaded portion measures about 2" on each side. If we put a ruler on that, you can see that the threaded portion, from the bottom of the post to the top of the thread, measures 2" long. This is designed to fit a square 1 1/2" wide trailer axle. It is for 3500 pound axles only.
It's going to come with the included nuts. The opening is going to measure about 1 1/2", so that's how we can tell it's for 1 1/2" wide trailer axles. The bolt diameter is 1/2". The length from the bottom of that portion, there, to the end of the threaded area is going to measure 5" long. Then, again, that opening is going to give us an inside width measurement of 1 1/2". That's going to do it for today's look at the replacement U-bolt..
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
U-bolts and plates will be used to fabricate guide posts for my boat trailer. Great product !
Shipping was fast and the product is exactly what I was after. The web page did a good job of showing the product. My experiance with your staff was also excellent. I would defiantly order through you again. Thanks and Aloha.
Exactly what I needed.
Arrived quickly.
Trailer still in use.
Should outlast the old trailer I put them on.
We are working on a vintage Shasta travel trailer. We were thrilled to find a very necessary part . 2 U-bolts ..the RIGHT size. E-Trailer were very helpful in filling our order. Clear, concise and prompt delivery. We will use them again.
As expected!!
It is hard to find U-bolts to fit older camp trailers (1969) But these U-bolts from etrailer were well made and fit perfectly-thanks.
I sent for 4 ubolts for my horse trailer because etrailer was the only one who had the right size . I ordered them overnight and they came at 12 so o had time to put them on the next day .
I put them on they fit they were the ones I ordered so o saved $680 by using my own trailer and not needing to hire a hauler .
I’m extremely happy with my purchase and the speed it got here so I give 5 stars because you guys earned them .
Thank you
I’d do business with you again in a New York City second !
My experiance in dealing with etrailer could not have been beter. they were frendly, new there products and got me the right kit for the trailer I was working on. The quality is very good.
Fit perfect! Exactly what I needed!
Quality Bolt. I will use Etrailer again. I could not find these bolts locally mainly because I work six days a week and the parts suppliers in the area only work five.
This made Etrailer a awesome option. Price was the same as the local suppliers and I had the parts in four days allowing me to finish my trailer without having to take time off from work to chase parts, another added savings. Thank you Etrailer.
I couldn't find the proper size at any stores near me, found them at "etrailer" at a great price with reasonable shipping and received them a day earlier than expected, they fit perfectly, definitely will keep "etrailer" in mind for future projects
Fit perfect for an older trailer with 1.5 in axle and 1.75 leaf springs. Exactly what I was looking for. Thank you etrailer!
Exactly what I needed to fabricate two mounting brackets to attach the canopy I built for my Kubota.
Thanks!
Haven't installed them yet but they look perfect—the videos on you site are extremely helpful, but it would be even better if you suggested this product any time someone browses or buys a set of 1.5" wide leaf springs (ideally you'd suggest both this product and the U-bolt equivalent to cover both folks with square and cylindrical axles).
Thanks again for your excellent service!
Nice quality and length to replace on tent trailer square axle u bolt
Used this to mount tail light brackets on my old M101-A2 trailer. Fit like a glove around the framework.
I have a1962 camp trailer that I wanted to reverse the axle
I searched through my city, and was not able to find square U bolts
I went to our”Trailer” expert business and was told they not linger carried 1 1/2 bolts, they referred me to a speciality spring shop only to find he did not have the capability
I finally look online and found that Etrailer had in stock
I will now go to Lori at Etrailer 1st
Perfect fit for hard to find axel bolts
My etrailer.com parts fit exactly to the specifications needed for the little green trailer I was restoring. Thanks etrailer.com for having some difficult to find parts available for my project. Shipping and communication was excellent as well.
Worked great could not find them anywhere in town
Very happy with the great product, great price, as well as fast, fair-priced shipping. Will definitely use etrailer again when the need arises.
Eric
8/30/2021
I sold the trailer that this part was installed, but the installation went smoothly, and I was happy with my purchase.
Purchased these for a vintage camper trailer repair for a customers camper . The u bolts where not available to me locally anywhere , I found your store online and saw the dimensions chart giving an exact description of what I was ordering . The u bolts arrived quickly and was just what I needed , these bolts where good grade bolts and nuts and not cheep junk .Thank you for being a seller of quality I WILL PURCHASE FROM THESE GUYS AGAIN ...
Steven G.
9/11/2017
Working great ,,no complaints. ....
Excellent product and hard to find. The shipping was super fast which allowed me to finish my project fast!
I looked all over for a u-bolt to replace one that broke on my 70's era horse trailer. I was about to give up when I found an exact match on etrailer.com. These shipped fast, were packaged well, and are just what I needed!
Looks great, have not installed yet tho ugh.
Info for this part was:
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.
Gerald
11/24/2023
Trailer still holding up.