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CE Smith U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts - Zinc
CE Smith

CE Smith U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts - Zinc

Part Number: CE23002
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Trailer Suspension Parts
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Mount your round, 2-3/8" diameter axle to your trailer's leaf springs with this U-bolt kit. U-bolts, plates, nuts, and washers included. Zinc plating resists rust and corrosion - great for boat trailers. Great Prices for the best trailer suspension parts from CE Smith. CE Smith U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts - Zinc part number CE23002 can be ordered online at or call 1-800-940-8924 for expert service.
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CE Smith Trailer Suspension Parts - CE23002

  • U-Bolt Kits
  • Boat Trailer
  • Snowmobile Trailer
  • Round Axle - 2-3/8 Inch
  • 5-1/2 Inch Long
  • 3500 lbs
  • 1/2 Inch Diameter
  • CE Smith

Mount your round, 2-3/8" diameter axle to your trailer's leaf springs with this U-bolt kit. U-bolts, plates, nuts, and washers included. Zinc plating resists rust and corrosion - great for boat trailers.


  • Mounting kit attaches trailer axle to leaf springs
  • Galvanized plates and zinc-plated hardware resists rust and corrosion
  • Includes:
    • 4 U-bolts
    • 2 U-bolt plates for 1-3/4" springs
    • (8) 1/2" Hex nuts and washers
  • Spring seats (sold separately) required for mounting axle to leaf spring
  • Made in the USA


  • Application: 2-3/8" diameter axle
    • Typical 3,500-lb axle
  • U-bolt dimensions
    • Inner width: 2-7/16"
    • Length: 5-1/2"
    • Diameter: 1/2"

23002 CE Smith U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts - Zinc

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Video of CE Smith U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts - Zinc

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

Video Transcript for CE Smith U-Bolt Kit for Round Trailer Axles Review

Speaker 1: Today, we'll be having a look at the CE Smith line of U-bolt mounting kits for mounting round trailer axles. Here's what our kit comes with. It's everything you need for replacing the U-bolts on a single axle on your trailer. We have 4 new U-bolts, you'll have 2 per side; 2 new plates, 1 per side; 8 new lock washers, you'll be using 4 for each side of the trailer; and 8 new nuts, again 4 for each side of the trailer.You can see how well our U-bolts grip around the contours of our axle. This'll keep the axle firmly attached to our leaf springs, so we don't have to worry about it slipping and sliding.Now because we have the zinc and the galvanized finish on our plate and our hardware, this will better protect them from corrosion from the elements, especially salt spray. It's not an issue if you decide to use them on a boat trailer such as this one.Now many of our customers have had to make a second phone call or send an email to us after they bought a new axle for their trailer because they found, once they tried to remove the old one or put the new one on, that they couldn't get their factory U-bolts off.

They had to cut them off, and now they're searching for a replacement. This kit will be a perfect solution for this problem here.Now many of our customers compared these to the Redline line of U-bolt kits. Now the main difference you're going to see between this one and those is that those do not have the galvanized or the zinc finish on the plates or the hardware, which will cause them to rust out faster.As you can see, we already have our new axle sitting on top of our leaf springs. Now this kit could work for an axle that sits on top or below your leaf springs. It works for both applications.

You don't need to worry if yours resides below, you can still use this kit for that.We'll start by taking our new U-bolts and dropping them over our axle on either side of our leaf spring. Now we'll take our new plate. We want to make sure that this flange right here faces down, this hole here in the center lines up with the alignment pin on our leaf spring, and we'll insert our U-bolts through the holes. Place on our lock washers, and we'll put that on our nuts.Now we can start to tighten our hardware, making sure we tighten them evenly as possible. Now we'll torque our hardware again, making sure we alternate to ensure that we're doing it as evenly as possible.And that completes our look at the CE Smith line of U-bolt kits for mounting round trailer axles..

Customer Satisfaction Score:

Customer Reviews

CE Smith U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts - Zinc - CE23002

Average Customer Rating:  4.9 out of 5 stars   (314 Customer Reviews)

Mount your round, 2-3/8" diameter axle to your trailer's leaf springs with this U-bolt kit. U-bolts, plates, nuts, and washers included. Zinc plating resists rust and corrosion - great for boat trailers.


etrailer has become my source for almost everything for repairing or upgrading our trailer, the replacement of broken leaf springs being the most recent project.
If you have questions about the correct part for your project, search the customer service frequently asked questions. There is a lot of helpful information in there that you may not find on other websites. You can also contact customer service if you don't find a useful answer.



Its been a year since the leaf spring replacement and there have been no problems.


Customer [service] was great in helping me identify the correct parts for my car hauler. Ordered on Monday, package arrived Wednesday w free shipping. HUGE difference in ride quality!

Etrailer Expert

Brooke M.


You really know your way around a trailer! It looks great! What are you hauling? Im moving in a few weeks. Care to swing by and give me a hand? Just kidding.


Box delivered with a torn open corner and packaging for one of U-bolt kits was opened as well. Several 3/4” split washers ended up missing but U-bolts, hangars and nuts were fortunately in the bottom of the box.


Received my two orders and I'm impressed with the quality I see. I am in the process of cutting off the old rusted out fenders so it will be a little while before I can install the new springs and shackle kits. After that I can then install the new fenders and my trailer should be like new. Thank you for the help and prompt service.


The majority of the hardware was great. I had a couple of lock washers blow out during torque settings on the U-Bolts.


Thicker ubolts than original. Nice upgr ade


Better than most of the 7/16th inch u-bolts found on many 3500 LB axles that come as original equipment. The u-bolts are well made and the plates are thicker and galvanized for better rust protection.


etrailer is amazing.
My trailer got into
a tussle with a K-rail on the I-70 in Colorado. The trailer lost, bent axel and all that. One call to etrailer and Sara and two days later I'm back on the road. All the parts from MO toCO in such a short period of time. Thank you etrailer you are amazing.


Fit great, easy to install, good quality parts. No issues after a year.


Heavy Duty products


Great customer service. Product shipped and arrived in a timely manner. I'll be installing the new axle on my flatbed trailer this week - weather permitting.


Is this normal?

Etrailer Expert

Jenny N.


This set up all looks ok to me!


WOW, excellent Quality. installed perfect in Big Tex SA35.
PS - eTrailer is Awesome! Fast, priced right, competent. I'm never going anywhere else form here out.


Fantastic fast shipping will definitely deal with again


Fit perfectly.


I upgraded from a single leaf 3500lb axle spring to a 4 leaf 4000lb axle spring and also upgraded the U-bolts. The upgrade went very well. Everything fit perfect. The trailer tire to fender clearance was only 1.5 inches (at best) before the upgrade, now it is 3.5 inches. This will help the tire from rubbing the fender on the rough and bumpy road that we have in the state.


Highly recommend! I first made the mistake and ordered from “the other trailer parts outlet” so it took 10 days from my order to receive missing and beat up broken China made parts. The other place didn’t want to replace but wanted me to repair at my time and cost. I called etrailer, ordered on Monday, received on Wednesday. No damage as they actually package the parts up correctly. I got brand name parts too. Lesson learned. If you are on the fence or shopping around. Save yourself 10 days, 5 phone calls and hassle. Shop etrailer first.


I expect these to last just as long as the ones they replaced, which were on for 20 years. The plate seems to be thicker than the original. Wish there was a more specific torque rating than just a recommended range.


They still seem to be doing there job and holding up!


Very well made and heavier duty than I expected. Should last a long time.


worked well - fit as intended, and after a year, no issues of any kind.


I bought a trailer that someone had reversed the axle and did some “REDNECK ENGINEERING “on. I put the axle back where it was supposed to be by using U bolts I had ordered. Everything fit perfect. Now trailer is back like it was supposed to be, thanks to etrailer and Jane. She was so helpful and follow up on my order was exceptional. I know I can always count on etrailer to get what I need at a fair price. THANKS


Went on easy, torched to 75 and using it today


easy torched off bolts then put on new ones easier then cleaning all bolts and threads


Everything was delivered very fast and well packaged great company to do business with !

Show More Reviews

See what our Experts say about this CE Smith Trailer Suspension Parts

  • Replacement 25-1/2 Inch Leaf Springs and U-Bolt Kit For Travel Trailer With 3,500LB Axles
    It sounds like you have the 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles # e54SR which are 25-1/8". This measurement is taken with the leaf spring relaxed from center of bolt hole to center of bolt hole. With them holding the weight of the trailer they will begin to flatten out and get longer. We do also have them with a Dacromet Coating # e68SR which will withstand corrosion better than painted steel units. The CE Smith U-Bolt Kit # CE23002 includes new u-bolts, washers, nuts and...
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  • Recommended Leaf Spring Replacement For A 2019 Dutchmen Kodiak Ultra-Lite 283BHSL
    Definitely looks like the springs are being overloaded and need to be replaced. You can use higher rated leaf springs but, the higher you go the stiffer the ride will be. Since we know the weight class with your axles the next step would be to measure from eyelet to eyelet to figure out the correct length. With the leaf spring being flat it's going to measure a bit longer than it typically would so we would just need to find something close to the measurement. At 4,000lbs we have a...
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  • Replacement Axle For Yacht Club Jet Ski Trailer With 89" Hub Face & Idler Hubs 5 on 4-1/2"
    While we do not offer a square axle we do have the Round Axle # e65GR which will fit your trailer. This has the 89" hub face to hub face and idler hub with 5 on 4-1/2" pattern you are needing. The spring center to spring center is 74" or you can have 2 new Spring Seats # TRSS238 welded on at the correct mounting width for your springs. You will need the U-Bolt Kit # CE23002 to install these axles since they are 2-3/8" round.
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  • Suspension Parts Needed for 3,500 lb Tandem Axles and 29-1/2" Hanger Spacing
    Thanks for all of the information, Robert! It sounds like you have the Tandem-Axle Trailer Hangers # H248 installed on your tandem axle trailer so to get your Dexter Trailer Axle w/ Electric Brakes # 7359765-EB installed you need the following parts: - 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles # e54SR - CE Smith U-Bolt Kit # CE23002 - Suspension Kit for Tandem-Axle Trailers # AP233 You need a total of 4 leaf spring, 2 of the U-Bolt kits, and just one of the suspension kits...
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  • Do You Have a 3,500LB Axle with 4" Drop and 5 on 4-1/2" Bolt Pattern with Electric Brakes, 95" Hub F
    All of our 3,500LB, 4" drop axles with 95" hub face like our etrailer Axle # e45SR you found are going to have a 80" spring center. As we do not offer custom axles you can easily have the springs seats removed and 2 new Seats # TRSS238 installed at your 81" spring center. This is typically cheaper and much faster than ordering a custom axle from a local dealer. I recommend upgrading to the U-Bolt Kit # CE23002 with galvanized spring plates and zinc coated hardware to resist corrosion.
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  • Replacement U-Bolt Kit, Suspension Bolts, and Leaf Springs for a 2007 Haulmark TS6X12DS2 Trailer
    You'll need the CE Smith U-Bolt Kit # CE23002, 9/16" Bolts like part # 126B2 and then one of the following leaf spring sizes: - 23-1/8" Long # e59SR - 25-1/8" Long # e68SR - 27" Long # e97SR To get the correct leaf spring length you just need to lift the weight off of your leaf springs and measure from the center of one bolt hole to the center of the other bolt hole and then choose whichever spring best matches what you currently have.
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  • Replacement For 25-1/2 Inch Leaf Springs on Boat Trailer
    Leaf springs flatten out over time, so since yours are 25-1/2" center to center, you'll want to go with ones a little shorter than that: - 3-Leaf Double-Eye Spring for 4,000-lb Trailer Axles - 25-1/4" Long - Dacromet # e93SR The # e93SR says for "4,000 lb" axles but that is just their capacity; you said you have 2-3/8" axles, which is a 3,500 lb axle, so this will give you a bit of added strength. You mentioned 3" shackle bolts as well, and for those use # 166081. Then for the U-bolts,...
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  • Correct MORryde Rubber Equalizers for Trailer With 33" Wheelbase
    Thank you providing that measurement. Since you have a 33" wheelbase that is correct, you need the # MR87ZR. To choose the right MORryde Suspension Upgrade Kit you will also need to measure your shackle straps. If they measure 2-1/4" from center hole to center hole you need the # MR46ZR and if it is 3-1/8" you need the # MR76ZR. Choosing replacement leaf springs will require knowing your leaf spring length and axle capacity. The length is the spring eye to spring eye measurement. You can...
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  • U-Bolt Kit For Double-Eye Leaf Spring e48SR
    Here is what you need for a rust-resistant U-bolt kit and shackle bolts to go with the 4-Leaf Double-Eye Spring # e48SR: - CE Smith U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts - Zinc # CE23002 - Zinc Shackle Bolt with Locknut for Double-Eye Springs - 3" Long # TRFA73Z916DLNZ
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  • Can Square Axle be Replaced With Round Axle & How to Find Right Axle
    You can replace your square axle with round axles, but you would need to replace both axles instead of just one to ensure you have the same length axles, which will ensure your suspension and tires wear evenly and avoid problems. In order to choose the correct replacement axle for your trailer you will need to know the dimensions of your current axle's hub face to hub face and spring center to spring center; I have added a link below to a video which walks you through how to measure....
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  • Does Trailer Axle with Idler Hubs e65GR Come With U-Bolts
    The Trailer Axle with Idler Hubs # e65GR does not include U-bolts so you will need to purchase them separately. For a kit that will fit this axle and also comes with the U-bolt plates I recommend using the CE Smith U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles # CE23002.
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    Andy, while I do like your Axle # e95SR and U-Bolt Kit # CE23002 selection of which you will need 2 of each I do have another recommendation for the suspension kit. The Tandem-Axle Trailer Hanger Kit # APT3 you found has longer equalizers designed for a 35" spacing used on larger axles. Also I do not like the shackle straps it comes with either as they are a thin steel and over time the holes will likely start to elongate. Instead you should use the Dexter Heavy-Duty Suspension Kit # K71-359-00...
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  • U-Bolt Kits Available For Different Size Axles When Adding New Hangers
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    Yes, you can still install the Roadmaster Comfort Ride Leaf Spring Suspension Kit even though the trailer rides slightly nose high when coupled to the tow vehicle. When installing one of these kits you'll most likely need to get longer U-bolts since there typically aren't enough threads to accommodate the additional mounting brackets. To determine the right kit and U-bolts you'll need to know the capacity and diameter of your axles and how many axles your trailer has. 3.5k 2-3/8" Tandem...
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    Thanks for the picture! While this does help narrow down which leaf spring will be correct, you'll need to measure the length of your leaf spring with no weight on it (Jack the trailer up and have the axle dangling not supporting any weight). I included a diagram of the measurement needed. Now your picture shows you have a 3.500lb axle so chances are you use the common 25-18" # e68SR. But you should replace the U-bolts and plate with # CE23002 as well since they'll be ruined trying to...
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    Image 1 for Image 2 for
  • Replacement Leaf Spring Recommendation for 2009 Venture VAB-3025 Boat Trailer
    According to my research you should need 25-1/8" long springs rated for a 3,500 lb axle which means you'll need the following parts: - 3.5K Leaf Spring # e54SR OR Upgrade to part # e68SR - U-Bolt Kit # CE23002 for Round Axle OR # CE23103 for Square Axle - Heavy Duty Suspension Kit # K71-403-00 You'll want to verify the length of your current leaf springs by lifting your axle off the ground by the frame and measuring from center eye to center eye. If you measure something different...
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  • Replacement 3,500LB Trailer Axle With 89" Hub Face, Idler Hubs, Leaf Springs and U-Bolts
    For your axle we have the Trailer Axle with Idler Hubs # e65GR. This axle has a hub face measurement of 89" and includes idler hubs with a 5 on 4-1/2" bolt pattern. If you require a different bolt pattern please let me know. The axle has the spring seats mounted 74" on center. You can remove the current spring seats and have 2 new Spring Seats # TRSS238 installed between 71" and 77-3/4" on center if yours are not 74" on center. For double eye leaf springs you will need to select the correct...
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    We do have replacements for the specs you're asking about. The kit you're looking for comes from CE Smith: - CE Smith U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles # CE23002 This kit comes with the U-Bolts, mounting brackets, and the lock washers and nuts needed to complete the installation.
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  • 3,500 lb Axle And Leaf Spring Setup - What Parts Do I Need?
    We can set you up with all of that. We do offer a 3,500 lb 95" hub face axle # e68GR. The spring seats on this axle are at 80", so we can sell you a few loose spring seats # TRSS238 and you can have them attached at 76". We can also provide new U-bolts # CE23002 for mounting the axle. We can get you some electric brake assemblies # AKEBRK-35-SA and hubs # AKHD-545-35-G-EZ-K to go with it. The hubs have the standard 5 on 4-1/2" bolt pattern. We can also set you up with springs. If you...
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