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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
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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. 1-800-496-5010 to order Blue Ox accessories and parts part number BLU48FR or order online at Free expert support on all Blue Ox products. Guaranteed Lowest Price 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 (42)
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  • Videos (1)
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Blue Ox Accessories and Parts - BLU48FR

  • Weight Distribution Hitch
  • Hardware
  • 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 Reviews

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

Average Customer Rating:  4.8 out of 5 stars   (42 Customer Reviews)

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


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


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.
Mark - 07/03/2022


u-bolt it perfect for my blue ox swaypro

very well
Pierre B - 06/02/2022


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

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.
-- Etrailer Expert Jenny N - 06/20/2022


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..


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


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


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!


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.


Arrived in good time. Product is as adv ertised.


Easy to install and work great. The originals were very worn. I'm glad this was an easy fix.


Have bought from etrailer many years Very good service !


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.


Order came on time and accurate. Exactly what I needed for by my Blue Ox sway bars.


When looking for replacement parts other cities wanted me to buy a hole hitch or a lease half of one. etrailer had just what I needed and for a good price.The delivery was prompt to. Thank you for your service!


Wanted to paint the weight distribution bars and replace the U-bolts after four years of use. Had no success finding comparable U-bolts at local hardware and auto parts stores. Checked the etrailer site and found exactly what I needed. The customer service and delivery was great and efficient!


Exact part that we needed Staff were friendly and efficient


These bolted right up and replaced the worn u-bolts exactly. Actually quieted down the towing rig a bit. Easy to work with staff, easy to order and prompt delivery.


came very fast.glad to see you had the part i needed.


What I needed at a good price. Fast Del ivery!


Everyone was great!


Thanks for the very prompt delivery.




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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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