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Replacement U-Bolt Kit for Blue Ox Weight Distribution Spring Bars

Replacement U-Bolt Kit for Blue Ox Weight Distribution Spring Bars

Item # BLU48FR
Our Price: $22.97
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Shipping Weight: 0.35 lbs
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Replaces the U-bolts and hardware needed to install your Blue Ox spring bars on your trailer's weight distribution system. 1-800-940-8924 to order Blue Ox accessories and parts part number BLU48FR or order online at Free expert support on all Blue Ox products. Great prices and Fastest Shipping for Replacement U-Bolt Kit for Blue Ox Weight Distribution Spring Bars. Accessories and Parts reviews from real customers.
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  • Reviews (61)
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  • Videos (1)
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Blue Ox Accessories and Parts - BLU48FR

  • Weight Distribution Hitch
  • Hardware
  • Bolts
  • U-Bolts
  • Blue Ox

Replaces the U-bolts and hardware needed to install your Blue Ox spring bars on your trailer's weight distribution system.


  • Replaces the U-bolts and hardware needed to install your Blue Ox spring bars on your trailer's weight distribution system

BX88391 Replacement U-Bolt Kit for Blue Ox Spring Bars

Replaces Blue Ox 84-0217

Video of Replacement U-Bolt Kit for Blue Ox Weight Distribution Spring Bars

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Review of Blue Ox Weight Distribution Hitch Parts - Replacement U-Bolt Kit - BLU48FR

Ellen: Hey everybody, I'm Ellen here at, and we're taking a quick look at the replacement hardware for your Blue Ox spring bar. If something happened to that original hardware, maybe it got rusted out, or damaged, or bent, or something else happened to it, and you just need this hardware to replace, this is going to be a great way to do it without having to replace the entire unit. I will say, though, if your weight distribution went through something like a crash, or some other kind of catastrophic failure, it's probably a good idea to get a whole new replacement. But again, if just the hardware is bad, everything else is fine and is up to code and all that good stuff, then this is going to be an easy way to fix that hardware.It's going to come with everything you see laid out on the table here; I'll go over those parts with you. We'll get our two U bolts; these are going to be 3/8" bolts, and then we'll have our locking 3/8" nuts to go with that, and also the fender washers, one for either end. As far as the size of the nut, to take it off, it looks to be about a 1/2", maybe about 9/16", actually, to get that off.

The distance of the U bolt, or the total length here, about 2". Distance in between the two posts is about an 1 1/4", just to give you some reference points, in case you're not using this for the same application, maybe you want to use some of it for someone else, just for reference.That's pretty much it for a quick look at the replacement U bolt kit for your Blue Ox weight distribution. I hope this helped in deciding if this is the right replacement part for you. We do have a lot of other replacement parts for Blue Ox, and all kinds of accessories for your towing-weight distribution needs. Check us out right her at

Thanks for watching.

Customer Satisfaction Score:

Customer Reviews

Replacement U-Bolt Kit for Blue Ox Weight Distribution Spring Bars - BLU48FR

Average Customer Rating:  4.8 out of 5 stars   (61 Customer Reviews)

Replaces the U-bolts and hardware needed to install your Blue Ox spring bars on your trailer's weight distribution system.


Pretty good job sleuthing out a tiny little replacement part for my trailer/truck stability system.. shipped perfectly and on my rig in less than a week. Bravo! Customer for life..



Bravo to the Blue Ox System. Gives me confidence pulling my Airstream. Could not be more satisfied. Truly!


Although we haven't used it is exactly the part I needed to replace. The ubolts on my arms were bent pretty badly. Searched everywhere to buy them for my mechanic to install. Nobody sells these. Had to order on agent was very helpful and product arrived on time! I recommend for any parts tou need for any blu ox unit! We will be taking trailer out this weekend and have every confidence in this product.


The go-to site for camper trailer parts. I had checked locally at our three major hardware stores, but U-bolts were not in stock at the necessary weight.
The online video was exactly right for clarifying that I was ordering what I needed to replace U-bolts that were damaged by a bottoming-out. Keeps my weight distribution spring bars in order.
Exactly what I needed, easy to get, third buy from etrailer.


Back Ordered parts came a month earlier than you said they would. I like that. They came before the next two.


Parts showed up as expected and were easy to install.


Received order untimely matter and exactly the part I needed!


The product was exactly what I needed! After buying a couple of products that were labeled as what I needed, which were too small, including an incorrect recommendation from Blue Ox, I was very frustrated and reached out to etrailer. I was contacted by Sierra who was very concerned and persistent. We worked together and she found the right part. She definitely went above and beyond.



It’s working out perfectly. It was a matter of finding the right sized product and etrailer put in the extra effort it took.


Replacement U-Bolts for our Blue Ox trailer hitch were an exact match, with everything needed. Very quick shipping!


Very happy with order


Outstanding service, thank you.


Excellent service!


Easy to find what I needed and it was delivered early. Excellent service.


u-bolt it perfect for my blue ox swaypro

Pierre B.


very well


Awesome shipping time


The perfect parts delivered in record time. Thanks!


Weaker steel than original. Broke while driving after about 6 months of daily use. The spring bar put a big gash in the road.

Etrailer Expert

Jenny N.


I reached out to the manufacturer and if the u bolts break then it is typically from the system bottoming out or having too much tongue weight for the bars to handle.


Very fast and efficient service. Could not find the product in Albuquerque. One of the places suggested you pulled it up on ocmputer. they only made large U bolts


I am pleased with etrailer’s responsive and ability to provide OEM replacement products quickly.


Appreciate the prompt service and happy that you had exactly what I needed. These were replacements for a 5 year old Blue Ox weight distribution hitch that I was refinishing. Fair amount of rust and bolts were also stripped after I removed the old nuts. Glad that these were available.


Easy to order, fast service and good pr ice


It is what I ordered. It took a while, but that due to blizzard up north


It's almost impossible to find U-bolts in grade 5 or 8.
I'm cleaning up a Blue Ox Sway pro and cut off the old bolts.
So, finding the kit at a reasonable price was a no brainer.
I degraded one star because the washers don't appear to be grade 5.
I'll get some at Lowe's.
I'm happy.


These folks put customer service first, parts were missing in shipment, without hesitation they had new parts coming, no hassle. Great team of people to work with!


eTrailer had what I wanted, a reasonable price, and acceptable shipping.


Easy to order on their website, they had exactly what I needed. And it shipped right away. I would recommend using e- trailer and I will order from them again

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Kathleen M
Installed by:
Kathleen M
Employee Wilson B
Updated by:
Wilson B
Employee Mike S
Written by:
Mike S

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