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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: $43.34
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Trailer Leaf Spring Suspension
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Shipping Weight: 6 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 1-833-496-1390 for expert service.
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CE Smith Trailer Leaf Spring Suspension - CE23003

  • Boat Trailer
  • Snow Trailer
  • U-Bolt Kits
  • 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

California residents: click here

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:  4.8 out of 5 stars   (128 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.


Perfect fit for 3" axle


Good quality and good fit. They went right together and after a year have not required any retorque. No rust either.


The new set of springs seem just fine after a year of use. A set of 4 of these springs replaced the OEM springs after an equalizer failure bent one spring. The new springs appear to be more substantial than the OEM springs. All 4 had the same eye to eye spacing, so I didn't worry about tire wear from misalignment just because I replaced the springs. The OEM springs were about 6 years old and had flattened some. I had no installation difficulties. I did replace the nylon bushings with bronze bushings along with a set of wet bolts. The hardest part of the spring replacement job was identifying exactly which OEM spring was installed.


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.

One long trip out west and no issues. Very good quality part for the price.
Randy R - 08/28/2017


Plates are too soft. They easily bowed with minimal torque on U-bolts. I used the original plates from the OEM which were less prone to bowing. U-bolts also seemed soft and distorted easily in combination with the soft plates.

The torque specs for a half inch trailer suspension u-bolt like the CE Smith U-Bolt Kit part # CE23003
CE Smith U-Bolt Kit for Mounting 5.2K to 7K, Round Trailer Axles - 7" Long U-Bolts - Zinc
is between 45 ft lbs and 70 ft lbs. Otherwise it will
-- Etrailer Expert Heather A - 02/22/2022


I would have given these the highest rating because the product is excellent. The reason for just an average rating is solely because of the customer service or rather lack of customer service. I placed the order for this and 2 additional items to replace the entire suspension on a Passport 3350BH. All items were in stock when order was placed on 1/31/2022 with a delivery date of 02/03/2022. There was a snow storm on 02-03 which delayed the item to the following week which is understandable. However it continued to be delayed until the following week. After my first call I was told the storm had caused a delay. I asked why my order was in a gathering stage for days and then changed to back to order accepted, only response was the snow had slowed them down. After another week of no order, I sent 2 emails with just a standard response of blaming a snow storm 2 weeks prior. I asked several questions on my order which were never answered, I’d have to assume that they just didn’t care to answer or it’s a general email they send to everyone. Long story short the order came on 02/19 which is completely unexceptionable based on a 3 day original ship date. Hard to explain to a customer that a snow storm that we had as well pushed the ship date out 16 days on in stock items.


Works great. Heavy duty and plated.


good service. Latest package arrived with a few parts missing - lost during shipment. etrailer is shipping replacement parts. Always had good service and products from etrailer


The suspension parts were exactly what I needed. Always a pleasure to do business with etrailer.


Awesome service. Was able to speak with a great parts gal named Shawnee. She helped me get all the parts I needed to completely rebuild my 5th wheel suspension. All parts arrived before I expected and were an exact perfect fit.


great product!


Excellent staff support
Items arrived
earlier than expected


Good, solid stuff. A great value.


Perfect replacement parts when installing a new axle.


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!

Product is great. Daily hauler with bobcat and concrete blocks over the mountains from NC to TN. Perfect!
David M - 12/01/2017


All the hardware was packaged so that the u-bolt threads were protected. Also liked the zinc plating.


This is a fall project so I have not installed them for this review. I will say that the ordering process met my expectations. The benefits ordering from Etrailer is a customer service will review your order and recommend alternatives should something not match up or be out of stock and keep you informed of your order.
My order was delivered as promised.


etrailer has good quality parts and lots of helpful information.

by: 03/31/2022

Super fast shipping, good packaging , quality parts


Excellent kit. Everything included for a easy fit.


Robert - 09/23/2021


U bolts needed more threads/or I ordered wrong


Great customer service...received product as promised. I have outfitted my trailer to organize and carry all my construction tools for building and remodeling. The springs are a noticeably stiffer than the smaller factory springs I had on trailer; however , that’s what I intended to get by upgrading.

I have every confidence that these won’t break like the cheapass factory springs Stealth put on their 14’ enclosed trailer. (No, I didn’t overload the trailer—the original springs failed due to the very thin metal and fatigue.)


Needed To Replace Axle,Have To Use New New U Bolts So Don't Fight With Old Ones,Thanks


Better than original

Show More Reviews

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

  • 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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  • 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.
    view full answer...
  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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
  • 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.
    view full answer...
  • Replacement Leaf Springs for 1998 Coachmen Catalina 364 TBS
    Based on the weight capacity you mentioned seeing on the spec sheet the best option for a leaf spring would be the part # SP-222275 which is for a 5,300 lb axle but is a bit shorter at 24-7/8 inches which is more common on the higher capacity axles. So then for a U-bolt kit you'd want the part # CE23003 which fits the 3 inch round axles which are the size of 5,200 lb axles. It will probably make the most sense to go with a new hanger kit too since the leaf springs are a shorter and you'd...
    view full answer...
  • Leaf Springs and U-Bolts for 2010 Keystone Cougar Travel Trailer
    The best leaf spring option we have is the part # SP-218275 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 # SP-220275 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 Leaf Springs for a 4400-LB Axle on a 2016 Grand Design Refrlection
    For your 2016 Grand Design Reflection 29RS, we have two possibilities for replacement springs that work for 4400-lb axles. You need to measure from the center of one eye of the leaf spring to the center of the other to get the proper length. However, since yours are flat, they have stretched quite a bit. So, an accurate measurement will be difficult. More than likely, you will need the 26"-long 6-Leaf Double-Eye Spring for 4,500-lb Trailer Axles, part # e27SR I've linked to a video review...
    view full answer...
  • Recommendation to Replace Double Eye Leaf Springs on Montana 5th Wheel Trailer
    I am happy to get your Montana 5th Wheel Trailer all set up with new suspension components. When picking out replacement leaf springs, it is important to keep in mind that older springs will have stretched out a bit from their original length. This difference likely won't quite be the 1-1/8 inch difference between the 26 inch measurement you took on your springs and the 24-7/8 inch Double-Eye Springs # SP-222275 you referenced, but it is still a good idea to select a leaf spring stack...
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  • Converting Triple Axle Trailer From Slipper Springs to Double Eye Springs
    You will need to weld on new spring hangers to convert your triple axle trailer from slipper springs to double-eye leaf springs. The linked page shows you all hangers. Select hangers of the same height as the current ones to keep the trailer's stance as it is now or taller ones if you want to raise its height. For selecting cushioned equalizers you will want to match the hole spacing dimensions to your current equalizers. Please refer to the linked page showing cushioned triple-axle kits...
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  • Replacing Unknown 7,000LB Axle Hubs And Electric Drum Brakes On A Ron's Dump Trailer
    To confirm that the Dexter Trailer Hub and Drum Assembly # 8-219-18UC3 will fit on your Ron's Trailer axle you will need to measure the spindle on your axles. I have included a picture for the measurement locations for the spindle. You can also compare the bearing numbers that you have to determine if they share the same inner dimensions. B-2.25" ( # GS-2250DL) C-1.750" ( # 25580) D-1.250" ( # 14125A) If these match and you have the E-Z lube spindle the Dexter # 8-219-18UC3 is the right...
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    Image 1 for
  • Recommended Axle To Replace 86-1/2" Long Dexter Mobile Home Axle
    I reached out to my contact at Dexter and based on the part number you provided you have an older mobile home axle that has an 86-1/2" hub face to hub face measurement, and 75-1/2" spring center to spring center measurement. They were unable to find the exact weight rating of the axle. Based on the hub face length you need for a replacement we have the Trailer Axle Beam with Easy Grease Spindles - 86-1/2" Long # e45GR which has a 5200lb axle rating which would be a great choice. The spring...
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  • Compatibility of Hub/Rotor, U-Bolts, Hangers, and Bearings for 6k Trailer Axle
    The trailer axle components between a 5.2k and 7k trailer axle are essentially all the same so what you are wanting to do overall will work. The axle # e23GR is 3 inch in diameter so the shock kit part # RM-2460 will fit it. The hanger kit part # APS4 though is a single axle hanger kit and since the shock kit is for a tandem setup it's worth mentioning that and offering the tandem axle setup # H248. The U-bolt kit part # CE23003 does fit the axle diameter, as well as the spring seat part...
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Info for this part was:

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