bing tracking image
  1. Trailer Leaf Spring Suspension
  2. Redline
  3. Camper
  4. Car Hauler
  5. Utility Trailer
  6. U-Bolts
Replacement U-Bolt for 1-1/2" Wide, Square Trailer Axles - 1/2" Diameter - Raw Finish

Replacement U-Bolt for 1-1/2" Wide, Square Trailer Axles - 1/2" Diameter - Raw Finish

Item # 1753223
Our Price: $10.61
You Save: 23%
Trailer Leaf Spring Suspension
Orders above $99 qualify for Free Shipping
Shipping Weight: 0.66 lbs
In Stock
Redline Camper,Car Hauler,Utility Trailer Trailer Leaf Spring Suspension - 1753223
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos


Need help with installation?
Locate installers near me
5" Long U-bolt works with a U-bolt plate and another U-bolt to help secure your 1-1/2" wide, square trailer axle to its leaf springs. Raw finish. Great Prices for the best trailer leaf spring suspension from Redline. Replacement U-Bolt for 1-1/2" Wide, Square Trailer Axles - 1/2" Diameter - Raw Finish part number 1753223 can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (76)
  • Q & A (0)
  • Videos (1)
  • Photos
  • Why etrailer?

Redline Trailer Leaf Spring Suspension - 1753223

  • Camper
  • Car Hauler
  • Utility Trailer
  • U-Bolts
  • Square Axle - 1-1/2 Inch
  • 5 Inch Long
  • 3500 lbs
  • 1/2 Inch Diameter
  • Redline

5" Long U-bolt works with a U-bolt plate and another U-bolt to help secure your 1-1/2" wide, square trailer axle to its leaf springs. Raw finish.


  • Replacement U-bolt acts as part of a trailer suspension system
    • Used with another U-bolt (sold separately) and a U-bolt plate (not included) to secure one side of your axle to a leaf spring, which is mounted to your trailer's frame
  • Square bolt fits square axle beams
  • Raw finish


  • Application: 1-1/2" wide axles
    • For 3,500-lb axles only
  • Bolt size: 1/2"-13
  • Length: 5"
  • Inner width: 1-1/2"
  • Distance between bolt ends (on center): 2"
  • Quantity: 1 U-bolt

U-Bolt Diagram

Replacement U-Bolt for 1-1/2" Wide, Square Trailer Axles - 1/2" Diameter

Replaces 1753223 U-Bolt for 1-1/2" Wide Square Trailer Axles

Video of Replacement U-Bolt for 1-1/2" Wide, Square Trailer Axles - 1/2" Diameter - Raw Finish

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

Video Transcript for Redline Trailer Suspension 1753223 Review

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:

Customer Reviews

Replacement U-Bolt for 1-1/2" Wide, Square Trailer Axles - 1/2" Diameter - Raw Finish - 1753223

Average Customer Rating:  4.8 out of 5 stars   (76 Customer Reviews)

5" Long U-bolt works with a U-bolt plate and another U-bolt to help secure your 1-1/2" wide, square trailer axle to its leaf springs. Raw finish.


Nice quality and length to replace on tent trailer square axle u bolt


I ordered 4 square u-bolts and 2 plates as part of replacing the axel on a 1977 small boat trailer. Needed longer u-bolts than I fond any place else, but trailer had ones that could work. Ideally would have preferred stainless or at least galvanized for use in salt water, but at least could get trailer back on the road. 1 of the 4 u-bolts I ordered was narrower than the rest, had to be forced on at risk of damaging the threads. The center hole in the plate was too small to fit over the top bolt head on the leaf spring; so had to resort to under slung install - which was not the original trailer setup.

I will have our customer service team reach out to you. I would recommend using a corrosion resistant spray with the u bolts and plate. When using in salt water then rinsing off the u bolts and plates with freshwater will help to length the life of the parts.
-- Etrailer Expert Jenny N - 11/23/2021


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 These shipped fast, were packaged well, and are just what I needed!


They were the exact size I needed for my project.


Correct u bolt. On time.


Very happy with the great product, great price, as well as fast, fair-priced shipping. Will definitely use etrailer again when the need arises.

I sold the trailer that this part was installed, but the installation went smoothly, and I was happy with my purchase.
Eric - 08/30/2021


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 ...

Working great ,,no complaints. ....
Steven G - 09/11/2017


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


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!


Excellent product and hard to find. The shipping was super fast which allowed me to finish my project fast!


This was the only place I could find this for my old trailer, Thanks


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.


My parts fit exactly to the specifications needed for the little green trailer I was restoring. Thanks for having some difficult to find parts available for my project. Shipping and communication was excellent as well.


Used this to mount tail light brackets on my old M101-A2 trailer. Fit like a glove around the framework.


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.


Exactly what I needed to fabricate two mounting brackets to attach the canopy I built for my Kubota.


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.


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 for an older trailer with 1.5 in axle and 1.75 leaf springs. Exactly what I was looking for. Thank you etrailer!


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 !


Good quality products and easy install, just what I needed! Thanks!

Great! Product was of good quality and fit the application well.
Kristina - 07/23/2020


Item arrived timely snd is exactly what we needed. We love you guys, you never disappoint!!!


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


Product is high quality and as described on Extremely happy with purchase. Will definitely visit site again.


This went very well. The parts were exactly what I needed and I received them when promised. In addition, the web site detail for the parts was great as I was able to order the parts to 3 critical dimensions as clearly displayed on the web site. Thank you so much.

Show More Reviews

See what our Experts say about this Redline Trailer Leaf Spring Suspension

  • U-Bolt Dimension Measured on Bolt Centers
    I pulled a Replacement U-Bolt with Nuts # 1753223 from our warehouse to measure the distance between the U-bolts measured on center and found that dimension to be right at 2 inches. Check out the video I attached that shows me taking this measurement with a dial caliper.
    view full answer...
  • What is the Torque Requirement for 1/2 Inch U-Bolts for Trailer Suspension
    According to our FAQ on slipper springs, linked for referenced, the torque specs are as follows: Torque Ratings 1/2 inch Bolts: 45 ft/lbs - 70 ft/lbs 9/16 inch Bolts: 65 ft/lbs - 95 ft/lbs 5/8 inch Bolts: 100 ft/lbs - 120 ft/lbs The Replacement U-Bolt, # 1753223, uses a 1/2 inch nut so it would fall into the 45 to 70 foot pound category.
    view full answer...
  • Should Trailer Leaf Springs Be Easy to Move Up and Down
    If the slipper springs on your trailer have a lower capacity like # WIC2 at 500 pounds apiece, then it would be possible to physically compress them with the trailer empty but it should not be all that easy. With a load on the trailer it will be easier. If you find that you can move the springs then it is probably time for some new ones. On higher capacity springs you probably would not be able to move them at all without a load on the trailer. I have included a link to our slipper spring...
    view full answer...
  • How to Determine Axle Weight Capacities on a Trailer
    The axle capacity should be stamped on the frame of the trailer near the coupler of the trailer. It also could be listed somewhere on the axle. I wish there was an industry standard weight capacity for the 1.5 inch by 1.5 inch square solid steel axles but there is not. If you do not see a weight capacity listed in either of those places you can remove the hubs on your trailer and give me the bearing numbers that are listed on the spindles. I will be able to tell which hubs and spindles...
    view full answer...
  • Determine Square Axle Capacity
    Square axle capacities are pretty hard to determine. Unlike round axles, they do not have set capacities based on their dimensions. We have no information for the bearing numbers you listed. But what you can do is give me some exact measurements of your spindle and we should be able to see if there is a hub we carry that would fit so that you could at least get a ballpark on your capacity. I need the dimensions of where the bearings and seal ride. You might be able to contact the original...
    view full answer...
    Image 1 for
  • Does the Replacement U-Bolt for 1-1/2 Wide Square Trailer Axles Come with the Nuts
    Yes. The Replacement U-Bolt for 1-1/2" Wide, Square Trailer Axles - 1/2" Diameter # 1753223 does come with the matching nuts to secure these U-bolts to your axle to the leaf spring with a U-bolt plate. I've linked the review video of these U-bolts that shows the nuts that are included with these, they're just not included in the product photos currently, so I can see why this might be confusing.
    view full answer...
  • U-Bolt Mounting Plate to Use with 1-1/2 inch U-Bolts # 1753223
    The u-bolt plate part # 115983 is the correct size for use with the 1-1/2 inch u-bolts part # 1753223.
    view full answer...
  • Securing Axle U-Bolts With Loctite
    Though it is not completely necessary to use something like Loctite's Threadlocker # LT37420, there wouldn't be any adverse affects either. Most U-Bolt kits do come with lock nuts making them more secure than standard nuts, but you can definitely apply # LT37420 to completely secure their purchase on the U-Bolts.
    view full answer...
  • Replacement U-Bolts Compatible with CE Smith U-Bolt Kit for 1-1/2 Inch Square Axle
    The CE Smith U-Bolt Kit for Mounting 1-1/2" Square Trailer Axles - 3-3/8" Long U-Bolts - Zinc # CE23102 unfortunately doesn't have direct replacement parts outside of the kit. The Replacement U-Bolt with Nuts for 1-1/2" Wide, Square Trailer Axles - 1/2" Diameter # 1753223 is the closest we have to what you are seeking but it is not zinc plated and is 5 inches long.
    view full answer...
  • Need Replacement Square U-Bolt for 1-1/2 Inch Axle
    For a replacement U-Bolt closest to your measurements, I have the Replacement U-Bolt with Nuts, part # 1753223, which is for 1-1/2 inch wide, square axles. We also sell these U-Bolts in a pair, part # SP01-120. The Replacement U-Bolt, part # 1753223, will work great with your 1-1/2 Inch, 1800 pound capacity axle. U-Bolts do not typically carry a weight rating.
    view full answer...
  • What is the Axle Capacity for an Old Trailer with Hub # 22834
    The bearing numbers you have provided indicate that you have hub 22834. This hub is no longer made but there are parts for it such as the bearings # 2788 and # 1779 an the races # 2729 and # 1729. The hub is rated for 2,600 pounds which means it fits a 5,200 pound axle.
    view full answer...
  • What is the Weight Capacity of a Trailer Axle with # L44643 Inner and Outer Trailer Bearings
    If both the inner and outer bearing are # L44643 bearings, that means it can fit on a BT8 spindle. One BT8 spindle, like # TRU94FR, has a capacity of 1,000 pounds. So on a single axle with 2 spindles, it would have a 2,000 pound capacity. The axle and/or trailer capacity should be on a sticker or plate on the trailer tongue.
    view full answer...

Do you have a question about this Trailer Leaf Spring Suspension?

  • Why

    At we guarantee:
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate trailer leaf spring suspension information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Cole B
Installed by:
Cole B
Employee Mike S
Updated by:
Mike S
Employee Eric H
Updated by:
Eric H

At 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. Let us know if anything is missing or if you have any questions.

Product Experts Available Now!
Call 1-800-940-8924