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

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Trailer Leaf Spring Suspension
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Shipping Weight: 6 lbs
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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 leaf spring suspension 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 Leaf Spring Suspension

  • Boat Trailer
  • Snowmobile Trailer
  • U-Bolt Kits
  • 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

Item # CE23002

California residents: click here

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:  4.8 out of 5 stars   (174 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.


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.


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.


Quality products . Delivered in a timely manner .


Nice looking U bolts for 1.75" springs, bought two kits for my 2 new axles I bought. They came with new hardware, I did add a bit of locktite to the threads since it only came with lock washers, but overall, a must have for any new axle install.


Replaced worn out springs and hardware. Everything fit and went better than expected. Simple enough to do yourself. Thanks


Shipping was much faster than expected. Customer service was excellent and a representative reached out to modify my order for faster delivery due to an item being back ordered. A replacement item was selected and everything arrived soon after order confirmation. All items arrived well packaged and exactly as I ordered it. I would definitely order from etrailer again.


u bolt kit worked well as planned


Fast shipping and great product as described. These are more heavy duty then the ones we took off the PJ trailer. Extremely satisfied.


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


Brent was awesome!! Helped me get the correct parts I needed. I ordered in a Wednesday midmorning and received everything the following day with free shipping. I will buy all my trailer needs from and will use Brent.


All of my parts arrived within a few days. Just finished putting them on. So far everything looks great.


Great people to work with . I certainly keep their information.


Put new springs and ubolts on my boat trailer looks good got them quick


worked very well


The packing was horrible and box end was completely open and had parts missing when delivered. If they would of bubbles wrapped items in box and put hardware in a sealed bag it might of got here in better condition. I had to go purchase 13 nuts before I could complete my repair and the worst thing is I already paid for them once.

Customer Service will reach out to you.
-- Etrailer Expert Sierra K - 11/10/2021


I only had the trailer for 3 months after installing them. But I really noticed a big difference in the ride of the trailer. I installed the same on my new trailer with the same results. Way better ride.


Other than the burs in the holes looks to be a good product. luckily I had rite size drill bit.


Ordering process was easy to use. etrailer order confirmation was quick and order status provided in timely manner. Order was delivered as estimated. I would definitely use etrailer again.


A was a great product fit perfectly arrived in great condition and timely manner i im super happy great job guys


Worked well. Get your dremel tool ready the holes in the plates are punched out and there tends to be tails of metal left over from the punch that you must ream out to get the bolt through.


I Have ordered several items and it is amazing how efficiently the order is processed and mailed out. All business should be as efficient. Great job


easy to navigate , very good product and great customer service with follow up.


Tommy in Customer service was a GREAT HELP! got the right parts for a great price.


My items were delivered on time and in great shape. I just finished loose fitting the springs, u bolts and shackle parts. Everything went together very easily. Thanks so much for your great product. And great prices. Will be ordering more in the future. Thanks again

Doing great. Great product. Great company.
Alan - 06/28/2019


Great service and a great product

Show More Reviews

See what our Experts say about this CE Smith Trailer Leaf Spring Suspension

  • Torque Spec for Tightening Nuts of 1/2 inch Diameter Trailer Suspension U-Bolts
    For 1/2 inch trailer u-bolts that attach to axle the recommended torque value is between 45 and 70 ft lbs of torque.
    view full answer...
  • Is the CE Smith U-Bolt Kit 23002 2-3/8 Inches Wide or 2-7/16 Inches Wide
    The 2-3/8" measurement you are referring to on the CE Smith U-Bolt Kit part # CE23002 is in regards to the diameter of trailer axle that the kit is designed to be used with. The actual width of the u-bolt from the inside edge of each bolt is 2-7/16" and the diameter is 1/2". We do not have a u-bolt with a 2-3/8" width and a 3/8" diameter. However, as mentioned above if this is for a 2-3/8" (3,500 lb) trailer axle then you will want to use one that is slightly larger than the width of the...
    view full answer...
  • Replacement Suspension Components for a 1987 Corey Dual Axle Trailer
    It is always best to replace your suspension components on your trailer with products that are the exact same size as what you currently have. We do have the U-Bolt Kit # CE23002 which is for 3,500 lb axles that have a 2-3/8" diameter and these are 5-1/2" long. I would double check your 5,500 lb axle as that is not a capacity that I am familiar with. It may be a 3,500 lb that could have been misread as 5,500. You can also measure the diameter to verify that it has a larger capacity. An...
    view full answer...
  • Will U-Bolt Mounting Kit for 1-3/4 Inch Diameter Axles Fit 2 Inch Diameter Axles
    The U-bolts on a kit like # CE23000 would not fit on a true 2" diameter axle. The inner width is 1-7/8" which would be just enough to fit on a 1-3/4" diameter axle. I recommend measuring your axle again, or measuring the inner width of your old U-bolts. Your typical 2" axle would be a square axle, and more than likely you actually have a 1-3/4" axle. Your round axle is going to have a 1-3/4" or 2-3/8" diameter. If you find that it is actually 2-3/8" you would need the # CE23002 instead.
    view full answer...
  • Should I Paint U-Bolts to Protect Finish
    If you are concerned about rust and corrosion, an excellent option for you is the CE Smith U-Bolt Kit for Mounting # CE23002 which comes with galvanized plates and zinc-plated hardware. The u-bolts included are also 5-1/2 inches long and 1/2 in diameter just like in the APUBR-1 kit. You can apply a coat of rust-resistant paint to the U-Bolt Kit # APUBR-1 if you want to but it's not required. In fact, most people don't because these components, while susceptible to rust, are not directly...
    view full answer...
  • Can 7/16" U-Bolts be Used for 3,500 lb Axle Suspension
    As long as the 7/16" U-Bolts that you are using fit your 3,500 lb axle diameter correctly and they are rated for a 3,500 lb axle then you are good to go. We only carry 1/2" U-Bolts, parts # CE23002 and # APUBR-1, but when I reached out to my contact at Dexter Axle, who is one of the leading axle manufacturers, they said that 7/16" U-Bolts are fairly common for 3,500 lb axles.
    view full answer...
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  • Replacement Dexter 3,500LB Axle For a 2012 Gatormade 16' Lowboy Tandem Axle Utility Trailer
    You will need the Dexter 3,500LB Trailer Axle w/ Electric Brakes # 7359765-EB to replace your axle on your 2012 Gatormade 16' lowboy trailer. According to the measurements(95" hub, 80-1/4" spring center) you provided as well as the information I could find this is the same axle the manufacturer installed with the electric brakes. The 1/4" difference on the spring center is likely a combination of tolerances and the axle loosing the slight curve and as it straightened got slightly longer....
    view full answer...
  • Recommended Replacement U-Bolts For a 2020 Grand Design Imagine Travel Trailer With 3,500LB Axles
    I recommend using the CE Smith U-Bolt Kit # CE23002 to mount the Dexter 3,500lb axle under your 2020 Grand Design Imagine travel trailer. This kit uses zinc coated u-bolts, nuts and washers while the mounting plate is galvanized to increase life of the components. These will last longer than the U-Bolt Kit # APUBR-1 which is not coated especially in climates where you see more humidity and salt.
    view full answer...
  • Trailer Suspension U-Bolt Kits for Round and Square Axles
    We do offer u-bolt kits for trailer suspensions for both square and round axles. All of these are shown on the linked page. The nearest round axle u-bolt kits we have to your 2-1/2-inch dimension are kits # CE23002 and # APUBR-1 which are for axles with a diameter of 2-3/8-inches. But we do offer a single 2-1/2-inch u-bolt with nuts as part # 175668, the item you referenced.
    view full answer...
  • Replacement Round Axle For Jet Ski Trailer with Square Axle
    The Dexter Trailer Axle Beam with E-Z Lube Spindles # 7359765 would work for you as a replacement axle. It will require new Spring Seats # TRSS238 to be welded on at your 84" spring center measurement. You will also need a new U-Bolt Kit # CE23002. This kit has been zinc coated to resist corrosion on your jet ski trailer. I recommend using new bearings and hubs with your new axle. If you let me know your wheel bolt pattern I can give you my recommendation for those parts as well. Is...
    view full answer...
  • 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.
    view full answer...
  • How to Tell if Trailer Axle Will Fit 1987 Ranger Trailer
    If your current axle has 89" hub face and 74" spring center measurements then yes, the Trailer Axle with Idler Hubs - 4" Drop - 5 on 4-1/2 Bolt Pattern # e72GR can be used as a replacement but you'll also need to swap out your U-Bolt setup for the CE Smith U-Bolt Kit # CE23002 since you'll be changing from a square axle to a round axle. Attached are some review videos as well as a photo showing where to measure for the hub face and spring center measurements.
    view full answer...
    Image 1 for Image 2 for
  • Recommended Replacement Tires for Lowered Trailer Currently Using LT235/75R15 Off-Road Tires
    If your springs are already on top of your axles as it sounds, then you will lose the diameter or your axle plus the spring stack height when you flip the springs to the traditional location under the axle. This will most likely lower your trailer by a little over 3 inches. You need a new u-bolt kit for your axle, so I recommend the CE Smith U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts - Zinc # CE23002 if your axle is 2-3/8 inch diameter or # CE23003 if...
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    Image 1 for
  • Replacement Leaf Springs, U-Bolts, & Shackle Straps for 3,500 Pound 1981 Bass Boat Trailer
    The leaf spring I recommend to replace your trailer's existing leaf springs is the 4-Leaf Double-Eye Spring for 3,500 Pound Trailer Axles # SP-212275. This spring measures 25-1/8 inches from eye-to-eye and will work well to replace the existing spring length. Based on your trailer axle's diameter, the capacity of the axle is 3,500, which is the axle capacity for which these springs are designed. The number of springs to not determine the axle capacity, so it will not affect your trailer...
    view full answer...
    Image 1 for
  • Recommended U Bolt Kit and Shackles for 3500-lbs Axle
    For a 3500-lb axle, it's most likely a 2-3/8" diameter so you can use the U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts # APUBR-1. If this is a boat trailer or utility trailer that might be sitting outside a lot you may want to consider upgrading to the CE Smith U-Bolt Kit # CE23002 since they're zinc plated and will help fight off corrosion a bit better. For shackles, the most popular size shackle is 2-1/4" like the part # TRSL225, but you'll want to measure...
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  • Replacement Axle for 1990's Karavan Trailer
    The best option we can offer you is the Dexter Trailer Axle Beam part # 8327812 which has a 3,500 lb capacity and E-Z Lube feature. This axle has the same hub face length of 89" and drop of 4" that you were looking for. The spring center is set at 74" yes but you can move these inward to match your 70" spring center no problem. In regards to shape, square vs round this will also not be an issue. The u-bolts would be different yes but you would need to replace these when removed from the...
    view full answer...
  • Will Dexter Axle Beam 7359765 Replace Bent 95" Hub Face To Hub Face Dexter Axle?
    It sure is! The Dexter Trailer Axle Beam # 7359765 you were looking at has the same 95" hub face to hub face and 80" spring center to spring center measurement as your current axle so this will be an exact replacement for you. The spring seats on this axle are located on the bottom so it will sit above your leaf springs just like your old axle. Since you mentioned you brake components are in good shape they can be transferred over as this axle uses the same bearing combination of # L68149...
    view full answer...
    Image 1 for Image 2 for
  • Recommended U-Bolts and Plates for Dexter 428510 Axle
    For your 3,500 lb Dexter axle, I recommend the U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts # APUBR-1 or the CE Smith U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts - Zinc # CE23002.
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  • Replacement Double Eye 4 Leaf Spring For Single Axle Trailer
    I have two sets of springs that are a 4 leaf spring that'll work for you. They are for two different weighted axles, a 3,500 lb axle # SP-212275 and a 6,000 lb axle # SP-221275. Both measure 25-1/8 inches long which is a bit shorter, but this is the measurement without any weight on the springs. I've included a diagram with more measurements so you can double check! These both do not come with the mounting hardware. You could use the same hardware or you can use one of these # 7162184UB. I've...
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  • Determining Correct Replacement Equalizers, Shackle Straps, and Leaf Springs For 1999 Tahoe Lite
    I would be happy to confirm the replacement suspension parts you will need for your 1999 Tahoe Lite with 2800lb axles, but you will need to confirm a few measurements before placing your order. First you will need to measure the distance center to center between the horizontal mounting holes on your current equalizers, and the center to center measurement of the holes in your current shackle straps. The Dexter Heavy-Duty Suspension Kit for Tandem-Axle Trailers - 1-3/4" Wide Double Eye...
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    Image 1 for Image 2 for
  • Axle U-Bolt Kit for Single 2-3/8-Inch Diameter Trailer Axle
    We have many sizes of round and square axle u-bolt kits that appear on the linked page. These are not rated by weight so you simply want to choose the one to match your axle diameter, which should be 2-3/8-inches. U-bolt kits # APUBR-1 or # CE23002 will do the trick.
    view full answer...
  • Recommended Bolt On Hangers For Aluminum Frame Trailer
    Since you've got an aluminum frame trailer, I understand why you're looking for a bolt on solution. The only available bolt on hangers we have available would be the # CE14017G and # CE14016G but they are designed for slipper springs and not double-eye springs like # e77SR you were looking at. If you went this route you would want to use something like the # SP-040275 as your springs, which have a 3700-lbs capacity. This would be the best solution available for your new aluminum trailer,...
    view full answer...
  • Replacement Axle Needed for 3,500 lb Square Tube Axle with 89" Hub Face
    The only square tube axles we have are for smaller boat trailers, but we may still have some compatible options depending on your trailer. The Trailer Axle w/ Electric Brakes # e43SR has an 89" hub face length as well as a 74" leaf spring center length so if this matches the dimensions of your trailer then you just need the U-Bolt Kit # CE23002 to fit this to your trailer. Another option is the Timbren Axle-Less Trailer Suspension System w Electric Brake Hubs # A35RS545E rated for 3,500...
    view full answer...
  • Parts Needed to Add Tandem Axles to Boat Trailer
    The first step in figuring out what replacement axles to get for your boat trailer is to measure the hub-face and spring-centers of your old axle. After you find that out then you can choose axles that match what your old axle had. I have attached a photo showing where you need to measure on your old axle. You can then use the Hanger Kit # APT5, U-Bolt Kit # CE23002, and Double Eye Spring # SP-212275 for 3,500 lb axles. Be sure that you use the following measurements for this hanger kit...
    view full answer...
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