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CE Smith U-Bolt Kit for Mounting 5.2K to 7K, Round Trailer Axles - 7" Long U-Bolts - Zinc

CE Smith U-Bolt Kit for Mounting 5.2K to 7K, Round Trailer Axles - 7" Long U-Bolts - Zinc

Item # CE23003
Our Price: $57.59
You Save: 11%
Trailer Leaf Spring Suspension
Shipping Weight: 7 lbs
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Mount your round, 3" 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 5.2K to 7K, Round Trailer Axles - 7" Long U-Bolts - Zinc part number CE23003 can be ordered online at or call 1-800-940-8924 for expert service.
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CE Smith Trailer Leaf Spring Suspension - CE23003

  • U-Bolt Kits
  • Boat Trailer
  • Snowmobile Trailer
  • Round Axle - 3 Inch
  • 7 Inch Long
  • 5200 lbs - 7000 lbs
  • 1/2 Inch Diameter
  • CE Smith

Mount your round, 3" 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: 3" diameter axle
    • Typical 5,200-lb to 7,000-lb axle
  • U-bolt dimensions
    • Inner width: 3-1/8"
    • Length: 7"
    • Diameter: 1/2"

23003 CE Smith U-Bolt Kit for Mounting 5.2K to 7K, Round Trailer Axles - 7" Long U-Bolts - Zinc

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Video of CE Smith U-Bolt Kit for Mounting 5.2K to 7K, Round Trailer Axles - 7" 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 5.2K to 7K, Round Trailer Axles - 7" Long U-Bolts - Zinc - CE23003

Average Customer Rating:  4.7 out of 5 stars   (209 Customer Reviews)

Mount your round, 3" 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.


Very fast shipping, Rob was very helpful and made sure parts got shipped that same day even though I put the order in late that afternoon. Great job Rob and everyone at e-trailer!!!


Received my parts today and after examining everything all looks good.
The quality of parts looks excellent and can't wait to start installing them.
Shipping was fast and arrived as they said.
Great company to buy with.
Will was very helpful and very knowledgeable about parts.
If you call would definitely ask for Will.


Quinn did sn excellent job on my order We compared pricing and informed me as to del8very times, I received email updates and was informed as to when to expect delivery. Oustanding and professional customer service, Highly recommend etrailer your trailer needs.


Good selection of suspension parts to get our 2019 Jayco Eagle fifth wheel ready for a road trip


The u-bolts and plates are of excellent quality. Bolts are yellow cadmium plated and the plates are hot dip galvanized. The fit was perfect, no issues at all during assembly.

Randy R.


One long trip out west and no issues. Very good quality part for the price.


Works great. Heavy duty and plated.



Very heavy duty - grade 8 Checked torque and zero movement - nuts stayed tight! Use the proper U-Bolt kit for your needs.


Great parts and quick delivery


Great quality item, as always etrailer has the fastest shipping 5 star


High quality parts


What excellent service I received. I received my shipment promptly and one of my items was ordered incorrectly. I wish I had known but was not too bummed. It was probably my mistake. When I called to re-order the rep recommended I go right to the manufacturer for the special part, and gave me the number. etrailer credited my credit card for the incorrect part and because it was not an expensive item did not require me to return it. Thank You!!!


The UBolts plates didn’t fit had to use my old ones. The span was not wide enough for the u bracket to sit start through.


Good product


Other then UPS shipping everything was Awesome! Very fast shipping but just some damage and when I called William kicked ass and sent me what was missing ASAP!!!!


Arrived on time and as described


These are what you need when installing a new suspension package.


I have not been able to use parts as UPS lost one entire shipment, damaged another shipment and etrailer left some parts out of the replacement shipment. I want to replace all the items on my trailer together in one day.

Anyways, your company has been good about fixing the issues.

I hope UPS pays for the damage and lost shipments.


you sent me the wrong size U bolts. NOT GOOD!

Etrailer Expert

Jenny N.


Oh my goodness! Customer Service will be in touch as soon as possible.


Needs a little more threaded length or just shorter overall. Had to put in spacers to make sure the nuts didn't bottom out on the threads. I guess I have a narrow spring pack.


Missing 2 Lock washers

Etrailer Expert

Jenny N.


Oh no! Our Customer Service team will reach out.


They work, nothing special.


Springs arrived after a couple of days. I have never had an item better packed! Springs fir my trailer no modifications as well as U bolts. I wish I had thought to get new hanger bolts as these will be needed. Do not order your springs without new shackle hanger bolts!

David M.


Product is great. Daily hauler with bobcat and concrete blocks over the mountains from NC to TN. Perfect!


Great product


Website had all of the product information and specifications needed to make sure I was ordering correct parts for my trailer. Everything arrived incredibly fast and fit perfectly. The only negative was shipping damage.


Fast processing and shipping. Products arrived quickly!!!!


Holding up well thanks for following up

Show More Reviews

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

  • Torque Specs of the CE Smith U-Bolt Kit item # CE23003
    I checked with CE Smith and you will want to torque the 1/2" bolts of the U-Bolt Kit item # CE23003 to 65 ft lbs.
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  • 2017 Keystone Montana M-3160 RL Leaf Spring U-Bolt Torque Rating
    Your 2017 Keystone Montana M-3160 RL will have 7K axles which means you'll have a U-Bolt kit similar to CE Smith U-Bolt Kit # CE23003 which needs to be torque to between 45 ft/lbs - 70 ft/lbs.
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  • Torque Specs for CE Smith U-Bolt Kit for Mounting 5.2K to 7K, Round Trailer Axles
    The torque specs for a 1/2" trailer suspension u-bolt like the CE Smith U-Bolt Kit part # CE23003 is between 45 ft/lbs - 70 ft/lbs.
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  • Recommend U-Bolt Kit for a 3 Inch Diameter Trailer Axle
    If you have a round 3" diameter axle on your Spartan boat trailer then you are going to want to use the CE Smith U-Bolt Kit part # CE23003 which contains u-bolts that are 7" long x 3-1/8" wide x 3/8" diameter. The reason you need this size u-bolt for a 3" diameter axle is because the u-bolt will need to be wider than 3" in order to fit a 3" diameter axle and significantly longer than 3" in order to attach the plate over the leaf spring stack. Unfortunately, we do not have a u-bolt in the...
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  • U-Bolt Kit Recommendation for a 3 inch Diameter Axle
    Sounds like you are looking for the CE Smith U-Bolt Kit part # CE23003 which is a kit for 3 inch axles, has u-bolt plates and matching nuts. The length of the bolts is 7 inches and the diameter of them are 1/2 inch.
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  • What Info is Needed to Pick Out Replacement Axle and Leaf Springs for Trailer
    When picking out an axle for a trailer you'll need to know the overall length of it from hub face to hub face as well as the distance between the spring seat centers to pick out correct size. I also attached a link to a page with all of the axles we carry. To pick out replacement leaf springs you would need to know the axle capacity and length of your current springs. I also attached a link to all of the 6k leaf springs we carry as well. Then for a U-bolt kit you would want the part #...
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  • Distance From Inside Arc Area Of U-Bolt To Threads For U-Bolt Kit Mounting Kit
    I pulled one of the U-bolts we offer from our warehouse and took a quick measurement for you. The distance from the inside of the inside arced area of the U-bolt, part # CE23003 to the threads on the leg is 4-3/4 inches. The threaded portion is 2 inches. I also pulled another set of U-bolts, part # APUBR-8 and the measurement from the inside of the arc to the threads is the same 4-3/4 inches as well as the threaded portion being 2 inches. This is a 1/2-20 fine thread U-bolt.
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  • Parts Needed to Make Over Under Axle Kit for Trailer with 7k Axles
    You'd need new u-bolts like the part # CE23003 and then spring seats like part # TRSS300 and you'd be able to make an over under axle kit for your trailer with 7k axles. Basically you install the new spring seats on the opposite side of the axle and then move the axles to the other side and secure them with new u-bolts.
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  • Will The 6-Leaf Double-Eye Spring for 5,300-lb Trailer Axles Fit a Forest River Cherokee 25pack12?
    There are a couple ways to verify if the 6-Leaf Double-Eye Spring for 5,300-lb Trailer Axles # SP-222275 is the correct size for your Forest River Cherokee 25pack12. First if you can find the axle tag information stickers on the back of your axles I can use that information to verify what the axle manufacturer installed on it from the factory. If you can find these please send me a copy of each sticker. If you are unable to find the axle information tag on the back side of the axle tube...
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  • U-Bolt Kits Available For Different Size Axles When Adding New Hangers
    Our U-Bolt kits are available separately due to axles having different sized and most hanger kits can be used with several different size axles. Here is a list of different size kits depending on your axle size. 1-3/4" Round Axle # CE23000 2-3/8" Round Axle # CE23002 3" Round Axle # CE23003 1-1/2" Square # CE23102 2" Square # CE23103
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  • Replacement Leaf Spring for 2020 Grand Design Reflection 240RL
    The etrailer leaf spring part # e27SR is the correct capacity and length to work on your 2020 Grand Design Reflection 240RL. It having a couple more leaf's would not be an issue at all either. Since the height would be slightly different you would want to replace all of your springs on your trailer. For a u-bolt kit we have the CE Smith kit part # CE23003 which is for 3 inch diameter axles like you have.
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  • Replacement Leaf Spring For A 2014 Heartland RV Landmark Fifth Wheel
    The 6-Leaf Double-Eye Spring for 7,000 pound Trailer Axles # e64SR is 24-7/8 inches long and since your springs measure out to be 26 inches when fully loaded these springs will work on your 2014 Heartland RV Landmark Fifth Wheel. The springs have a sturdy steel construction and have the nylon bushings included. The spring capacity is 3,500 pounds which makes the axle axle capacity 7,000 pounds. If you need a new U-Bolt Kit # CE23003 is the kit you will need. I attached a review video...
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  • Are The 6-Leaf Double-Eye Spring for 5,000-lb Trailer Axles # UG34FR Sold Individually?
    The 6-Leaf Double-Eye Spring for 5,000-lb Trailer Axles # UG34FR is for a single spring. You will need to order a quantity of 2 to replace both springs on your single axle trailer. Each spring is rated for 2,500lbs for a total capacity of 5,000lbs for the trailer on a single axle. Be sure to check your current U-Bolts as you may need a new CE Smith U-Bolt Kit # CE23003 when you replace the leaf springs. This kit includes the u-bolts, nuts and u-bolt plates for both sides of your axle.
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  • Help Allowing SumoSprings Trailer Helper Springs To Fit a 2007 Cedar Creek 5TH Wheel Camper
    You are correct the SumoSprings Trailer Helper Springs # SS26MV are the correct choice for your 2007 Forest River Cedar Creek 5th wheel having overslung 6,000lb axles. Do be sure to order a kit for each axle. For the spring plate it may be best to get all new plates and U-bolts # CE23003 for each axle. This hardware is coated to help prevent corrosion unlike the factory parts which are usually painted steel. If your hardware is still in good shape you will most likely want to just grind...
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  • Can Leaf Springs Be Replaced With Higher Capacity Springs And Parts Needed For Replacement
    You can replace your lower rated leaf springs with a higher capacity spring with the same dimensions, but your trailer will ride much stiffer. Adding higher capacity springs will not add more to your trailer's capacity so you'll want to still stick to your trailer's current limitations. Since you'll be removing the U-bolts to swap out the leaf springs it's recommended to replace them as well. For a 3" diameter axle you'll need U-Bolt Kit # CE23003.
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  • Recommended U-Bolt Plates and U-Bolts For 7000lb Axles With 2 Wide Springs
    I have another option for you, but the CE Smith U-Bolt Kit # CE23003 you were looking at is designed for 1-3/4" springs and will not fit with your 2" wide springs. Instead you will need two of the U-Bolt plate # TRTP300200 per axle, and two of the U-Bolts # CE15287GA for each axle. This will fit your 7000lb axles perfectly, and will be what you need to connect them to your leaf springs.
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  • How Thick Is The 6-Leaf Double-Eye Spring # e27SR?
    The 6-Leaf Double-Eye Spring # e27SR is 2-1/4" thick at the thickest part of the spring pack(not including center pin). Each of the 6 leaves are 3/8" thick. If you are mounting this to a 3" axle you will want the U-Bolt Kit # CE23003, otherwise we have the U-Bolt Kit # CE23002 if you are attaching it to a 2-3/8" axle.
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  • U- Bolts Closest To 2-1/2" Inside Diameter And 6" Long
    I have one slightly smaller and one larger option as we do not currently have a u-bolt that matches your dimensions. The 2-3/8" Round Trailer U-Bolts # SP01-040 are only 2-3/8" wide and 5-1/2" long when measured inside the bolt bend to the end of the threads. It is 1/2" diameter like you are looking for. For something slightly larger the Replacement U-Bolt w/Nuts # 175668 are 2-5/8" wide and 7-3/4" long. They can always be cut down to the necessary length as they have threads covering...
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  • Can New Spring Seats Be Welded Onto The Top Of An Trailer Axle Beam
    Yes, you'd just need to reach out to a qualified welder and have them weld on spring seats like part # TRSS300 to the top side of the Trailer Axle Beam with Easy Grease Spindles # e45GR. It's super common to do for people who have an underslung setup and want to raise the height of the trailer. When you remove the old axle you'll also want to replace the u-bolts with ones like part # CE23003 since they get stretched when torqued down and shouldn't be reused.
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    Image 1 for Image 2 for
  • Replacement Axles for 2017 Grand Design Reflection 29RS
    What you're looking for is an 86-1/2" long replacement axle. Since you will need new hubs and drums, along with brakes, I recommend getting the # 8327816-EB. This has a 71-1/2" spring center length so you will also need to cut off the spring seats and weld on # TRSS300 to match the current 68-1/2" measurement. Grand Design does a great job listing their parts, but unfortunately they don't include the leaf spring information. You will need to measure your current leaf springs to find the...
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  • Leaf Springs and U-Bolts for 2010 Keystone Cougar Travel Trailer
    The best leaf spring option we have is the part # e28SR which has a 5,000 lb axle capacity and is 25-1/4 inches in length. Old springs do tend to stretch a bit over time but in your case this capacity matches what you are in need of and is a close enough length that it would work well. Then for a u-bolt kit for a 3 inch diameter axle you'd need the part # CE23003 which comes with plates and nuts/washers.
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  • U-Bolt Kit for a 3,500 lbs Axle
    It sounds like you are looking for a u bolt kit for a 3,500 lbs axle. The 3-Leaf Double-Eye Spring for 4,000-lb Trailer Axles - 25-1/4" Long item # e57SR will work great for a tandem axle suspension system. For your ubolt kit you're going to need the Redline U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts item # APUBR-1. I have attached a diagram so you can compare the dimensions. It's better to use a piece of string to measure a round axle than a tape measure....
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    Image 1 for
  • Replacement U-Bolt Kit For Dexter 4400lb 3 Axle With 6-Leaf Springs
    The CE Smith U-Bolt Kit # CE23003 will fit your 3" round Dexter 4400lb axle. The U-bolts are 7" long. The 6-Leaf Double-Eye Spring # e27SR uses 6 leaves that are 3/8" thick which will make the spring pack 2-1/4" tall. When you add that to the 3" axle and 9/16" spring seat you have a total thickness of 5-13/16". That leaves you 1-3/16" for the spring plate and nuts.
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  • Does The Trailer Axle w/ Electric Brakes # e65SR Also Include U-Bolts For Mounting?
    The Trailer Axle w/ Electric Brakes # e65SR does not include U-bolts. We have either the Standard # APUBR-8 or Zinc/Galvanized Coated # CE23003 U-Bolt Kits depending on your application. If you are in an area prone to rust steel easily due to road salts or high humidity you will want to use the zinc/galvanized kit.
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Do you have a question about this Trailer Leaf Spring Suspension?

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Joshua S
Video by:
Joshua S
Employee Dustin K
Video Edited:
Dustin K
Employee Cole B
Installed by:
Cole B
Employee Brent H
Installed by:
Brent H
Employee Wilson B
Updated by:
Wilson B
Employee Amanda M
Written by:
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