1. Trailer Leaf Spring Suspension
  2. Universal Group
  3. Leaf Springs
  4. Springs
  5. Double Eye Springs
  6. 26 Inch Long
4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles - 26" Long

4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles - 26" Long

Item # SP-051275
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Trailer Leaf Spring Suspension
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4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles - 26" Long Leaf Springs SP-051275
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Double-eye leaf spring acts as part of a trailer's suspension system by providing an attachment point for a 4,000-lb axle. Spring flexes to resist shock and also ensures a smooth ride. Includes bushings with 9/16" inner diameter. Lowest Prices for the best trailer leaf spring suspension from Universal Group. 4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles - 26" Long part number SP-051275 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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  • Reviews (257)
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Universal Group Trailer Leaf Spring Suspension - SP-051275

  • Leaf Springs
  • Springs
  • Double Eye Springs
  • 26 Inch Long
  • 4000 lbs
  • Universal Group

Double-eye leaf spring acts as part of a trailer's suspension system by providing an attachment point for a 4,000-lb axle. Spring flexes to resist shock and also ensures a smooth ride. Includes bushings with 9/16" inner diameter.


Features:

  • Leaf spring acts as part of your trailer's suspension system
    • Provides attachment point for your trailer's axle
  • Multiple leaves allow flexibility to absorb road shock
    • Allows for a smooth ride
    • Reduces wear and tear on trailer
    • Ensures level ride on bumpy and uneven surfaces
  • Sturdy steel construction
  • Nylon bushings included
  • Pre-mounted hangers or aftermarket hanger kit (sold separately) required for installation
    • Spring attaches to hanger mounted on trailer frame at one end
    • Other end connects to shackle straps suspended from hanger or equalizer


Specs:

  • Quantity: 1 leaf spring
  • Spring capacity: 2,000 lbs
  • Axle capacity: 4,000 lbs
  • Length from center of spring eye to center of spring eye: 26"
  • Spring width: 1-3/4"
  • Eye diameter with bushing: 9/16"
    • Eye diameter without bushing: 11/16"
  • Leaf thickness: 3/8"
  • Number of leaves: 4
  • Additional dimensions: see table


Double-Eye Spring

Part NumberABCD
SP-05127513"14"26"4-1/4"


Note: To ensure proper axle alignment and suspension performance, leaf springs should always be replaced in pairs.



Leaf springs are an integral part of your trailer suspension system. The leaf springs provide the attachment points for your trailer's axle, suspending it from the frame of your trailer. Each spring flexes to absorb road shock as you travel, allowing the axle to move somewhat independently of the rest of your trailer. This helps to reduce wear and tear on the trailer and also ensures a smooth ride.


Double-eye leaf springs attach to hangers that are welded onto your trailer. One end of this spring will attach directly to the hanger with a suspension bolt. The other end will attach to shackle straps that are suspended from a hanger. These straps allow the spring to move and pivot so that it can better compensate for uneven pavement. If you have a tandem- or triple-axle trailer, the shackle straps will be attached to the equalizer that connects multiple springs.


To mount this spring, you will need hangers, shackle straps, and suspension bolts. If you are simply replacing a spring, you may still have hangers welded onto your trailer. You should, however, replace your shackle straps because they are usually the first component to wear out. You may choose to replace old suspension bolts as well. It is recommended that you replace the other leaf spring in your setup at the same time. Because springs can sag and elongate as they wear, this new spring may not exactly match the old one, and the alignment of your trailer could be affected.


If you are fabricating a trailer, you will need to purchase a hanger kit for installation. To determine the type of hanger kit that you need, you must know the specific type of leaf spring that you have, as well as your axle capacity. Depending on the hanger kits used with them, springs can be configured to work for single-, tandem- or triple-axle applications. Hangers and other suspension components can also be purchased separately if there isn't a complete kit that works for your setup.



UNA-051 Universal Group Double Eye Trailer Leaf Spring - 4 Leaf - 2,000-lb Capacity






Customer Reviews

4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles - 26" Long - SP-051275

Average Customer Rating:  4.9 out of 5 stars   (257 Customer Reviews)

Double-eye leaf spring acts as part of a trailer's suspension system by providing an attachment point for a 4,000-lb axle. Spring flexes to resist shock and also ensures a smooth ride. Includes bushings with 9/16" inner diameter.

- SP-051275
by:

These are good, they are not made here, the plastic bushings push right out and the wet bolt bushings went right in...



- SP-051275
by:

I had a broken spring on the road and had it replaced. I considered replacing only the other three. I decided to do all four to keep everything the same. I'm glad I did. I replaced the plastic bushings with the bronze ones and grease-able bolts that came with the pivot kit I bought. There were only pieces of the original bushes left in the old springs. I had not realized how over the years my trailer had sagged. Now it's like new again. NOTE** Make sure to press the bushings in, a bench vice works fine, and do not use a hammer. They are bronze, not steel, and can be ruined. ( Just some sound advice from a 68 year old professional).


Comments
These springe are holding up as I would expect. My trailer tows fine and halls very well.
R. W - 08/09/2021


- SP-051275
by:

Awesome product and price, highly recom mend.


Comments
They are already starting to Sag and I have less than a thousand miles on my trailer
Brett K - 10/06/2021


- SP-051275
by:

A good price and perfect replacement for my 2015 Puma Toyhauler. I would suggest upgrading the shackle hardware though. Everything on my camper's suspension is heavily worn and not the highest of quality. And if you're going to replace one, replace them all....



- SP-051275
by:

The boat trailer leaf springs arrived earlier than expected and they fit perfectly. Etrailer was the only place that had this spring in stock. I tried 3 springs locally that didn’t fit. After a lot of hard work I ordered the correct size and got them on. After four springs, on and off, I’m a pro now!!! Thanhs so much for having the correct size and being very nice when I called to verify the size! Pull trailer after the installation, and I couldn’t be happier!



- SP-051275
by:

They do exactly what they are supposed to do....what more needs to be said? I bought these because the old springs on my travel trailer had flattened out to the point that my tires would hit the trailer body in the top of the wheel well when flexing, such as when pulling into driveways. The new springs gave me the clearance to eliminate that problem, and are a little heavier duty than the old ones as well. Installation was very straightforward, and not too difficult for this 70-year-old guy, requiring just basic hand tools.



- SP-051275
by:

As usual, the order was shipped and received quickly. Parts were the quality I expected and no issues on fit. Email communication was very good. Never had any issues on numerous orders in the past.


Comments
Springs are over a year old with several thousand mikes on them. They have held up well
Bob - 10/24/2021


- SP-051275
by:

Very nice quality heavy duty springs. They’re on a custom built trailer, so I was relying on the accuracy of the published specs to select a replacement set of springs. The spec data was right on as these bolted up directly with no issue.



- SP-051275
by:

Using etrailer.com has been a great experience. They have a huge selection of trailer parts and make it very easy to find the right parts. The packaging seems to have gotten alot better. Very sturdy box. It arrived within a few days from ordering which was a huge plus. I was able to get the job done sooner than planned. That kind of experience will keep me loyal to etrailer for any future trailer parts needs. Thanks guys and gals. Keep up the great work. As far as the parts, eveything was heavier duty than factory. Since I measured the old parts I was able to find the exact replacements for those parts. The job went so smoothly without any issues. These springs raised the trailer height without any load on the axles 1.5 inches. It was definitely time for new springs and hardware. Im kind of glad the one spring broke.



- SP-051275
by:

I called customer service and worked with William B. He was patient and listened while i described problem and sent pictures to him for review and advice. He took time to search forums and find out specifications of the boat trailer which happened to be quite old. Helped solve a challenging problem and called me back quickly when had some questions about my order. he also sent me an email about the status of the order and let me know when it shipped. I was very impressed with the customer service. I ordered several size options and etrailer was great to work with. The trailer was for a boat MasterCraft Prostar 205 from '90s and wasn't able to measure the springs correctly because it was 3 hours drive away. Thanks for great service.



- SP-051275
by:

I replaced 3500lb axle springs with these 4000lb axle springs. Super easy. Good fits all the way around. Also suspension upgrade from Moryde, new Goodyear endurance on steel. Correct parts every time, faster delivery than anywhere. Too easy. Dont waste your time going anywhere else.



- SP-051275
by:

1-year review: Perfect fit. I thought the eye bushings looked a little chincy but they have held up well. The spring rate is perfect. Still at the exact sag as the day I put them on. The finish was fair to good but better than what I paid for. Im happy with how well they fit and have performed. I would buy again.



- SP-051275
by:

So far so good, they fit my old vintage trailer perfectly. My old ones were sagging and my camper would slowly rock from side to side when towing. Now my camper tows smoothly and no more sag.



- SP-051275
by:

Great replacement springs, I ordered brackets also. Cut all bolts with grinder and new ones went in like a charm. Didn't realize how bad the old ones were. Nice and easy upgrade.



- SP-051275
by:

The spring I purchased were just a little higher in rating than originals. The extra provided about 1/2" of additional lift. My tires no longer strike the fender! All ok so far!



- SP-051275
by:

Every time I have had the pleasure of doing business with eTrailer, both personally and professionally the results have been good. They have become my/our go-to source for all related needs. Not sure call them they are friendly and helpful.



- SP-051275
by:

Fit perfectly. Will check it out next trip but should be good



- SP-051275
by: 09/18/2021

Broke today 1 year and 4 months old...I wish there was a way to buy good quality stuff that wasn't made in China. I guess that cargo ship has sailed.



- SP-051275
by:

I order for my 2007 crossroads Cruiser 5th wheel. a set off 4 leaf springs And brakes all around everything fits perfect.



- SP-051275
by:

Perfect fit. Super fast shipping!!


Comments
No issues working great.
DAN P - 11/03/2021


- SP-051275
by:

Perfect fit for replacement of failed original part.



- SP-051275
by:

so far so good with the springs! it was an easy install once I cut the old ones out. They went right in and the trailer road fine with the boat on it.



- SP-051275
by:

Your company and your representative, were excellent in attitude and service. It is rare to find such personal service these days. We are passing your information on to fellow farmers in East TN. Thank You again.



- SP-051275
by:

Replaced my springs on my travel trailer a year ago and did over 10,000 miles and they are holding up well. No rust or squeaking. let's hope these keep on working like this for a lot more.



- SP-051275
by:

I replaced the nylon bushings with brass bushings, but otherwise just what I needed.


Comments
great
Ted K - 06/12/2020

33
265
Show More Reviews

Ask the Experts about this Universal Group Trailer Leaf Spring Suspension

  • Replacement Leaf Springs for a Vintage Camper
    With how long your current springs are, you will have replace the hangers for the springs to attach to. That being said, this does happen sometimes and it is not the end of the world. The Universal Group 4-Leaf Double Eye Spring # SP-051275 will have a length of 26 inches from eye to eye, so you will also need the # APS2 hanger kit. This will cover both hangers on both sides, so you will need no other parts to get this system up and running.
    view full answer...
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  • Replacement 26 Inch Double Eye Leaf Springs and Hardware
    26 inch leaf springs have different capacities and aren't based on the number of leaves directly so it is better to determine the axle capacity and then get the 26 inch springs appropriate for that capacity regardless of the number of leaves. The weight capacity numbers represented on the title of your 26 inch options are the axle capacity number (or greater) and the springs will be 1/2 that capacity so when one is on each side the axle the capacity is that larger number. Springs rated...
    view full answer...
  • Determining The Correct Replacement Leaf Springs For Tandem Axle Trailer W/ Square Axles
    I would be happy to help you find the correct replacement suspension components for your trailer, but you will need to take a few measurements first. Starting with the leaf springs, you will need to make sure that the tires on the side of the trailer you are working on is off the ground with the trailer supported by the frame as the leaf springs will stretch when the tires are on the ground and weight is applied. If your 26-1/2" measurement was with the tires off the ground the closest...
    view full answer...
  • Replacement 26-1/4 Leaf Springs for Trailer with 3,500 Lb Axle
    The 4-Leaf Double-Eye Spring part # SP-051275 measures 26" eye to eye unloaded so this would be an excellent replacement option. They will work great on a 3,500 lb axle offering a bit more support than the original equipment. The 1/4" difference won't be an issue as the springs were measured loaded and will shorten without a load.
    view full answer...
  • Should I Switch To Heavier Rated Leaf Springs For My Rock Climbing Trailer?
    I recommend staying with the 4-Leaf Double-Eye Spring for 3,500-lb # SP-212275. This will ensure that you do not have to change other parts of your suspension system and the trailer has the correct ride quality. The 4-Leaf Double-Eye Spring for 4,000-lb # SP-051275 may have issues with contacting parts of the frame since the springs are 3/4-7/8" longer. To correct this your spring hangers would need to be moved. The 4-Leaf Double-Eye Spring for 6,000-lb # SP-221275 would cause you...
    view full answer...
  • Measuring for Replacement Trailer Leaf Springs
    The best way to measure you springs is with them removed from the trailer. And it's likely they've flattened over time and weren't originally 26 inches. They may have stretched up to 3/4 of an inch. The length and weight capacity is more important than the number of leaves. As long as the replacement fits and is rated properly it will work for you. I've linked an article on trailer suspension you may also find helpful.
    view full answer...
  • Will these leaf springs work SP-051275
    There a few more measurements that are needed off of your current leaf springs to guarantee that you will find the correct replacement leaf spring. I have attach a diagram that will show the other measurements that are needed. You have the first measurement with the eye-to-eye distance. To find the correct replacement you will also need the spring height, measured from top of the center of the spring to the center of the eye. Also needed is the distance from the spring center to the...
    view full answer...
    Image 1 for
  • Replacement Double-Eye Leaf Springs Needed for a 2002 DHM Trailer
    Since leaf springs will stretch over time I recommend going with the 4-Leaf Double-Eye Spring # SP-051275 which is 26" long from center eye to center eye and is rated for a 4,000 lb trailer axle. This leaf spring has a width of 1-3/4" and a thickness of 3/8". I have attached a review video for you to check out as well.
    view full answer...
    Image 1 for
  • How to Determine Correct Leaf Springs for Trailer Axles
    Really the best way to determine the correct leaf spring for your axle is by measuring the length from the center of one spring eye to the center of the other eye if you have double-eye springs, or from the center of the spring eye to the end of the spring if you have slipper springs. Additionally, an accurate length for a leaf spring can only be measured with the trailer unloaded and on jacks. I have added a link to help articles on both double-eye leaf spring and slipper spring suspension...
    view full answer...
  • Replacement Leaf Spring Recommendation for 3,500 lb Trailer Axle to Replace 25-3/4 inch Spring
    The correct leaf spring you need is the part # SP-212275. This is a 3,500 lb axle spring that measures 25-1/8 inches in length. Since old springs stretch out over time this spring would be exactly what you need when you consider your current spring was around 1/2 an inch shorter when new.
    view full answer...
  • Replacement Leaf Spring for Karavan Boat Trailer
    Can you get me the length of your current springs and your trailer's axle capacity? With that I can pick you out the best option.
    view full answer...
  • Recommended 26 Inch Leaf Springs for 3750 lb Tandem Axle Boat Trailer
    The 4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles - 26" Long # SP-051275 will be the closest fit for your 3750 lb axle. Having leaf springs rated slightly higher is normal because you will be limited in capacity by the weakest component on your trailer and normally you want that to be your axle. These springs will not be too strong for that axle as to cause too firm a ride.
    view full answer...
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  • Can Bushing of Leaf Spring # SP-051275 be Replaced for Use with 1/2 inch Bolt
    You could swap out the bushings of the leaf spring # SP-051275 with the part # TRBU11506 and it would have correct inner diameter for a 1/2 inch bolt.
    view full answer...
  • Replacement Trailer Leaf Springs for 5200-lb Axle
    When a trailer leaf spring is well worn it can become elongated. Springs can flatten out and become as much as a 3/4-inch longer, measured eye to eye, than when they were brand new. So the correct replacement spring for your suspension might measure shorter than the worn spring you removed. That said, we do have several 26-inch leaf spring for various axle ratings from 2000- to 6000-lbs. The linked page displays all leaf springs and the filters on the page will let you select the axle...
    view full answer...
  • 25-1/4 inch Leaf Spring Recommendation for Travel Trailer with Tandem Axles
    20 year old leaf springs on a trailer could easily stretch 3/4 of an inch. Going with a 25-1/4 inch spring like you mentioned would be great. Since your springs are 3 inch in diameter that would indicate that most likely you have a 5,200 lb axle as that's a very common rating for that size. For a 25-1/4 inch length spring we have the part # SP-218275 which has a 5,000 lb capacity. # SP-220275 which has a 4,000 lb capacity, and # SP-115275 which has a 6,000 lb capacity. Suspension components...
    view full answer...
  • Replacement 4-Leaf Spring Recommendation for Trailer with 26-1/4 inch Old Springs
    In terms of lengh and capacity the best option we have is the 4k axle part # SP-051275 which is 26 inches long and is a 4 leaf setup. Springs tend to stretch a little bit over time so your old ones measuring 26-1/4 inches would be ideal for this spring. If your equalizers and shackles are in good condition still you wouldn't need to replace them. If so email me the dimensions of them and I will see what we have that would work well.
    view full answer...
  • Arch Height of Universal Group Leaf Spring
    The manufacturer of # SP-051275 is Universal Group and the arch measures 4-1/4 inches high. I've attached a photo for you to see.
    view full answer...
    Image 1 for
  • How Far Apart Should the Leaf Spring Hangers Be Spaced With a 26 Inch Long Leaf Spring
    When using the 4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles part # SP-051275 with the Single-Axle Trailer Hanger Kit for Double-Eye Springs part # APS4 you will need to space the leaf spring hangers 25-3/4" apart.
    view full answer...
  • How to Replace 26-1/2 inch Leaf Springs on Trailer
    Since old springs tend to stretch out about 1/2 inch you would want a 26 inch spring to replace what you have. Which we carry several. See the attached link. You would need to select the filter on the page that has the axle capacity that matches your trailer and it would be the correct fit. The part # SP-051275 that you referenced is for 4,000 lb axles.
    view full answer...
  • Can I Upgrade Leaf Springs on Utility Trailer With 3500 Lb Axle
    You can upgrade the 1750 lb leaf springs to 2500 lb leaf springs. You do want to keep in mind that the ride may be a bit stiffer since you are upgrading your springs to a higher capacity. Like you mention upgrading the springs will not give you a higher weight capacity because the axle is still rated for 3500 lbs. The only benefit may be that the springs last a bit longer because of the higher capacity. The new springs do need to be the same measurement spring eye to spring eye accounting...
    view full answer...
    Image 1 for
  • Can Boat Trailer Replace Slipper Springs With Double Eye Springs?
    Yes, you can replace your slipper springs with double eye springs. The Double-Eye Spring # SP-051275 measure 26 inches from center of spring eye to center of spring eye and would work for you; these have a 2,000 lb capacity each though you will need to find springs that match your trailer's capacity as closely as possible. The other thing you would need is a hanger kit such as # APS3, which has 1-1/2" tall front hangers, 1-1/4" tall rear hangers, and 3-1/8" shackle straps. The correct...
    view full answer...
  • Replacing 4-Leaf Double Eye Springs with 6-Leaf Double Eye Springs on 4,400 Pound Axle
    Installing slightly over-rated leaf springs on a trailer shouldn't cause any damage to the axle or other suspension components. There is no reason to replace the axle on your trailer with a higher-rated unit so that it matches the springs. Over-rated leaf springs may cause a bit of a rougher ride but I suspect that the "springy" experience you described has more to do with the noticeable difference between old worn-out springs and brand new ones that are in good condition. The difference...
    view full answer...
  • Leaf Spring Recommendation for 10k Trailer with 26-1/4 inch Springs
    Your 10k trailer with dual axles is going to have two 5k rated axles (most likely). The only double eye spring we have that would match that capacity is the part # SP-218275 but it would be about an inch too short as it measures 25-1/4 inches. You should note that old springs typically stretch out around 1/4-1/2 inch as they flatten over time. Dimensionally the correct spring we have would be the part # SP-051275 as it is right at 26 inches. This is for a 4k axle though. Best...
    view full answer...
  • Leaf Spring and U-Bolt Kit for Dexter 4,000 lb Axle
    Yes the leaf spring part # SP-051275 would be the correct spring for your 4,000 Dexter axle. This is a very standard length trailer leaf spring at 26 inches and will work well on your trailer. Then for a U-bolt kit part # APUBR-1 would be what you'd need and then for shackle bolts part # 166081.
    view full answer...
    Image 1 for
  • Correct Orientation of Straps/Clips on Leaf Spring Packs
    The strap you're pointing out in the photo is known as the rebound clip. It's meant to help prevent some axle wrap and to help keep the main leaf from breaking during a rebound. The spring should be installed so the straps are toward the front of the trailer. If you click the provided link, you can see an installation video.
    view full answer...
    Image 1 for
  • Replacement 26 Inch Leaf Springs, Shackle Straps, And U-Bolts
    To give you the correct leaf springs, I would need to know the capacity of your axle or what your Gross Vehicle Weight Rating (GVWR) is not just the weight of the trailer itself. This is the loaded capacity of the trailer. We have a few options for 26 inch leaf springs: 4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles - 26" Long # SP-051275 4-Leaf Double-Eye Spring for 2,000-lb Trailer Axles - 26" Long # SP-124275 6-Leaf Double-Eye Spring for 4,500-lb Trailer Axles - 26" Long...
    view full answer...
  • Replacement Spring for Boat Trailer
    Thank you for the information. When it comes to replacement springs, the eye-to-eye distance and weight capacity are the most important factors. Springs flatten - or stretch - over time, so your 26-3/4 inch springs were likely 26 inches. There are two possible four-leaf options for you, and the right one will depend on your axle's weight capacity. Spring # SP-051275 is for an axle with a capacity of 4,000 lbs. The other spring is # SP-124275, which is for an axle with a capacity of...
    view full answer...

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