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  1. Trailer Leaf Springs
  2. Universal Group
  3. 27 Inch Long
  4. Double Eye Springs
  5. 3500 lbs
  6. 4 Leaf
4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 27" Long

4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 27" Long

Item # SP-210275
Our Price: $73.80
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Double-eye leaf spring acts as part of a trailer's suspension system by providing an attachment point for a 3,500-lb axle. Spring flexes to resist shock and also ensures a smooth ride. Includes bushings with 9/16" inner diameter. Great Prices for the best trailer leaf springs from Universal Group. 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 27" Long part number SP-210275 can be ordered online at or call 1-800-940-8924 for expert service.
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Universal Group Trailer Leaf Springs - SP-210275

  • 27 Inch Long
  • Double Eye Springs
  • 3500 lbs
  • 4 Leaf
  • 1-3/4 Inch Wide
  • Universal Group

Double-eye leaf spring acts as part of a trailer's suspension system by providing an attachment point for a 3,500-lb axle. Spring flexes to resist shock and also ensures a smooth ride. Includes bushings with 9/16" inner diameter.


  • 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


  • Quantity: 1 leaf spring
  • Spring capacity: 1,750 lbs
  • Axle capacity: 3,500 lbs
  • Length from center of spring eye to center of spring eye (unloaded): 27"
  • 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

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-210 Universal Group Double Eye Trailer Leaf Spring - 4 Leaf - 1,750-lb Capacity

Replaces PR427

Customer Satisfaction Score:

Customer Reviews

4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 27" Long - SP-210275

Average Customer Rating:  4.7 out of 5 stars   (212 Customer Reviews)

Double-eye leaf spring acts as part of a trailer's suspension system by providing an attachment point for a 3,500-lb axle. Spring flexes to resist shock and also ensures a smooth ride. Includes bushings with 9/16" inner diameter.


Having never replaced a leaf spring before I decided to go ahead and give it a shot on my own. I reviewed the information on and found the replacement parts without a problem. Once they arrived I removed the old worn leaf springs and replaced them without much trouble at all. Back to safe trailering. Thanks etrailer for the help.


You sent the wrong spring 3 were correct 1 was wrong messed up my delivery date

Etrailer Expert

Katrina D.


I am sorry that this pushed back your delivery date. I see our customer service department is currently working on getting the return process started.


I purchased the 3000# axle springs and all mounting hardware to replace the old ones on my 1963 travel trailer. My trailer no longer leans to the left and goes down the road better than new. I should have done it many year ago. I received my package on time and installation was easy and fit perfect. Thanks Bridget


I completed construction of a mobile bandsaw mill and found the springs on the mobile home axle I used were much to strong. I believe they were rated for 6,000 pounds and did not flex with the light load of the bandsaw mill. The SP-210275 were a perfect fit for my need. Shipping was very quick and other than needing to purchase longer "U" bolts, I was able to simply remove the old springs and bolt the new springs right into place. Very satisfied with this purchase and installation.


I discovered that I needed to fit the holes in the bottom of my axle onto the studs on the springs before tightening the hardware fastening the springs to the rear shackles and front hangers.


With the outstanding help from Tommy at, I was able to purchase the right axle, hubs, spring and tires the first time. Everything arrived in good condition, went together like a dream. I was impressed with the quality of product and service.


Good shipping quick and quality product


Super fast shipping great part


The spring arrived earlier than I thought it would. Looks like it will fit and do the job. I purchased the leaf spring as an emergency back up in case on breaks on the Trailer. E Trailer hasn't let me down.


Great description of part. It was exactly what i needed. Arrived earlier than expected and i really appreciated being informed throughout the shipping process. This is my go to site from now on. Thank you very much.


Hello,I would like to say I am very satisfied with shipping was fast, price was great,now I'm ready to go catch them bass .


The product was correct but the ordering was next to imposible. It took weeks longer than necessary. It wasn't until I was refered to Mgmt. that my order was resolved, gratefully. All in all the 2 day project took 3 weeks. Still upset a year later.


Easy installation dose what I need it to do.



Product has worked just fine and hasn’t broken after using for a year. It has been loaded most of the time.


Great product! My first purchase from etrailer but it won't be my last! etrailer seems to have everything you would need for your RV or trailer. Waited until the last minute to pick up an extra leaf spring for my trip to Alaska. Fast shipping got it here in plenty of time. Thanks!


Installation pictures.


Great service. I know that I needed to do something to my trailer but I had no idea where or how to get the right parts Everything was too rusty to find any part numbers. I sent them a few pictures and gave them the measurement that they asked for and in about 30 mins I had a complete parts list of what I needed. When I got the parts everything was correct and fit great. Will defiantly be ordering from them again. Preston, and Jessica B were very helpful....



I rebuilt my little 5x8 utility trailer with parts from you guys and its been holding strong. Thanks for all the help. I went into this build without knowing much about suspension and you guys were a big help at getting the right parts.


All Parts arrived as ordered and their quality and type is as expected, thank you.

However, I would suggest better packaging when shipping leaf springs. The loose nature of the packaging seems to have caused the leaf springs to puncture the box causing a 2 day delay in shipping and the potential loss of my other items.



Great. Theyve been under the boat and holding it up just fine


Replaced a older set on a trailer with no specs. Bought the length closest to what I had, but a higher weight capacity. Replaced the axle to a 3500 lb one too. Have more confidence in the trailer now and I know it's a lot safer. How do these compare to others? I don't know. It's very hard to find these things locally and few sites have as good videos as etailer. These guys seem to know their stuff. There was lots of specs on these items at this website so I felt confident planning and executing the trailer upgrade.


The springs arrived quickly and they were an exact fit. Installed in about 1 1/2 hrs. Thank you very much


Well, I just got the parts, so can't say anything reliable on chinese made parts.
The price was(is) Great! a boat load cheaper then the local store....humm.

springs fit perfectly, however, the springs I wanted are no longer being offered, could of had springs made but I went with the less$isMore theory. (more in my pocket)

The "white" nylon bushings I ordered would not fit into the equalizers, but the grey colored ones I had did fit perfectly, just a-hair difference in outer diameter.

The bolts fit perfectly as well.

It is always 10 times easier dealing with eTrailer then the local store, So I know eTrailer has put a lot of time into making it easy for their customers, Thanks!

Very Fast shipping, all at a price I can afford!


Thank you etrailer!

The shipment
arrived sooner than expected, the leaf springs along with a hanger kit arrived in a heavy duty box with very good packaging. As for the leaf springs they're heavy duty thicker gauge compared to the ones currently on my utility trailer. With beefing up my suspension I'll be able to raise my box and carry a heavier load with my current axle.


The price was right and shipping was fast, and the video on measuring made it easy to be sure I was ordering the right part for my trailer. What's not to like? The only mistake I made was in not ordering all the hardware (U-Bolt kit, shackle bolts, and shackle straps) all at the same time. Although the videos say these parts can be reused, mine were rusty enough that they were really hard to get apart and then back together, even though they were only a year old.


It was the perfect size and fit right up. I bought it for my 1963 2 horse trailer with random axels and it worked great. Thank you.



Worked and fit great, I’m sure it will continue to work great for years to come. I love the fact that you took the time to follow up.


The leaf springs arrived and look excellent. The shipping and customer service has been top notch.

One note, the retention bolt on the bottom of each spring is slightly larger that the bolts were on the old springs (1964 Shasta travel trailer). Accordingly, I'll have to drill out the bolt hole on the axel leaf spring seat to accommodate the new bolt size. Otherwise, smooth sailing.


Purchased double eye 27" 4 leaf spring as a replacement on double axel boat trailer. Product matched description, affordable. Great customer service. Arrived early.
Would be nice if bottom leaf was extended width, to incorporate thru holes for U-Bolts to mount the springs to the axel.

Show More Reviews

See what our Experts say about this Universal Group Trailer Leaf Springs

  • Replacement Leaf Spring For 1998 Boat Trailer Carrying 18-Ft Bass Boat
    The best fit when replacing leaf springs on a trailer is to know what the trailer and axle capacity is. There may be a plate or sticker that has that information listed. We offer one single leaf spring, part # e46SR, and it is designed for 6,000 axles. It has a measurement of 25-1/4 inches eye center-to-center. If you are measuring the spring after it has been taken off the trailer it may have flattened a bit over time. As far as the leaves in the leaf spring, we may have one that...
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  • Should the Space Between Tandem Axle Trailer Tires Be the Same On Both Sides of the Trailer
    Is there more weight on one side of the trailer? If so, you would want to make sure the load is distributed evenly from side to side. Are you on level ground when you measured the distance between the tires? If not, that would cause one side of the suspension to have more of a load on it. I would measure the distance between the spring hangers on both sides just to make sure the problem is the springs and not where they are attached on your trailer. If everything checks out it might be...
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  • Can Two Single Axle Correct Track Kits Be Used in Place of Tandem Axle Kit
    Yes, you can use two of the Correct Track Trailer Alignment and Lift Kit - Single Axle # LC87120 and it will be the same as the tandem axle kit # RR23QX. The tandem axle kit comes with 8 suspension plates and 16 alignment correction plates along with the hardware. Since the # LC87120 has 4 suspension plates and 8 alignment correction plates it would be the same if you ordered two. For leaf springs, you will want to make sure you match the current capacity and length. The length is measured...
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  • Should Trailer Leaf Springs Have Higher Capacity Than Axles
    I recommend keeping the springs rated for 7,000 pounds if your trailer's axles are rated for the same. You have to keep in mind that a portion of the trailer's weight (Likely 10 to 15 percent) is on the hitch and therefore the tow vehicle's rear axle and not on the trailer axels. If you use 9,000 pound springs and overrate them you're likely to have a rough, stiff ride. Springs are rated by the axle capacity. The leaf springs for 3,500 pound axles are: # e59SR which are 23-1/8 inches...
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  • Which Double-Eye Leaf Springs Are Suitable For 5,500lb Tandem Trailer?
    The 3-Leaf Double-Eye Spring for 2,000-lb Trailer Axles - 23-1/2" # SP-113275 is rated for 1,000lbs each, and since there are two springs per axle the weight capacity would be 2,000lbs per axle. This would not be sufficient for your 5,500lb trailer so you would want a heavier duty leaf spring. I see you ordered 4 of these leaf springs which tells me you likely have a tandem 2 axle trailer. This means each leaf spring must be rated for a minimum of 1,375lbs to be sufficient for a 5,500lb...
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  • Replacement Leaf Spring Needed for a 2011 Forest River Wildcat 29BHS Travel Trailer
    From what I could find I believe that your 2011 Forest River Wildcat 29BHS has tandem 3,500 lb axles. Although I don't know what length leaf spring you are needing you will just need to compare the length of your springs with what we carry (as we carry the most common options). We offer replacement leaf springs that measure 23-1/8" long # e59SR, 25-1/8" long # e54SR, and 27" long # SP-210275. Please note that these measurements are taken from center eye to center eye (the C measurement...
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  • Replacing Suspension Components on Old Motorcycle Trailer
    It will be time to update your suspension on you motorcycle trailer. Current leaf springs for trailers are all 1-3/4" wide. To update your trailer you will need a correct Spring Hanger Kit # APS2. This will give you new hangers that will need to be welded to your frame. These will fit inside where your old mounts are as the new leaf springs will be much shorter. I have linked a help article below that will help you with the suspension systems on trailers. For leaf springs there are several...
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  • 2016 Coachmen Clipper BH17 Replacement Leaf Spring Suspension Enhancement
    It looks like the springs that you have are the 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles # SP-210275. These springs do not have a lot of curve built into them at 2-3/4" when relaxed from eylet to top of spring pack. There are some 4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles # e48SR that would give you a higher curve at 4-1/4" from eyelet to top of spring pack. Please note that the axle on your camper is rated for 3500lbs so the higher capacity springs will not increase...
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  • Can 3,500 lb Leaf Spring Be Installed on Vintage Aristocrat Lo Liner Trailer with 2,000 lb Axle
    Yes, you will need to replace the hangers as well since there will be a 1/4" gap. The 4-Leaf Double-Eye Spring # SP-210275 you're looking at is rated for 3,500 lb axle applications so I actually recommend using the the 3-Leaf Double-Eye Spring for 2,000-lb Trailer Axles # e84SR instead. This will give you just the right amount tension needed for your trailer - the 3,500 lb leaf spring will be too rigid and cause the trailer to ride more stiff. The 2K leaf spring is shorter than the 3.5K...
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  • Differences Between etrailer # e97SR and Universal Group # SP-210275 Leaf Springs
    The etrailer 4-Leaf Double-Eye Spring # e97SR is going to have the same dimensions as the Universal Group # SP-210275. Both springs are rated for a 3,500lb axle with center eye to center eye measurements of 27". They both are made of 4 leaves and have 3/8" thick leaves. The only difference is in the manufacturer of the product.
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  • How to Determine the Correct Leaf Spring Replacements for a 1975 Rolco Tandem Axle Boat Trailer
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  • What Would Cause Boat Trailer Leaf Spring to Flatten Out
    It's possible the weight of your trailer and boat is more than the capacity of the leaf springs you installed which is causing them to fail. Most 20 ft pontoon boats weigh around 2,200 lbs so it's very likely with the weight of your boat and the weight of the trailer you are exceeding that figure. So your best option is a new set of springs that are rated higher than the weight of the boat and trailer. The weight capacity figure is more important than matching the lengths as you can move...
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  • How Many Leaf Springs Come With the 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles
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    Trailer axles will often have some kind of labeling on them to indicate their weight capacity, sometimes a sticker but sometimes a metal plate too. If very old that axle sticker or plate could be long gone. The 1-1/2-inch square axle we offer, CE Smith Trailer Axle # CE33201GA-HUB, is rated for 1800-lbs and includes 5-on-4-1/2 idler hubs and also comes with bearings, races, seals, grease caps, wheel studs, lug nuts, and marine-grade wheel bearing grease. This axle has a hub face spacing...
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    I have attached a helpful article about double-eye trailer suspension you can check out. Basically, the leaf spring has an "eye," or bolt hole, at each end of the spring, created by rolling the steel of the spring to make a circle. The Over-Under kit # K71-384-00 you asked about is designed for a 2-3/8 inch axle and should work well for you. While you have the suspension apart it is always good to inspect the rest of the parts and replace any that show signs of being work or damaged....
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  • Torque Specs for U-Bolts with 3,500 Pound 4-Leaf Double-Eye Springs
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  • Torque Specs for Attaching Leaf Springs
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  • How to Pick Leaf Springs for a Trailer
    If you look on the frame of your trailer there should be a plate with the trailer VIN number and the axle capacities of the trailer. You will want to pick leaf springs that are as close to the axle capacity as possible. You will want to also measure the distance from eye to eye of your old leaf springs and then pick a leaf spring with the same weight capacity of your trailer axles and that is slightly shorter (around 1 inch) to compensate for the sag and wear of the old leaf spring. Leaf...
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  • Recommended Leaf Spring For 1,200 Lb Boat Trailer
    The longest leaf springs we offer are the 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles, part # SP-210275. These springs measure 27 inches eye-to-eye and are designed for axles up to 3,500 lbs. I have attached a photo of this spring that has the dimensions noted you can check out. When measuring the springs, the weight has to be removed from the springs. The leaf springs I recommend for your trailer are part # e84SR. This spring is designed to work with a 2,000 lb axle. The eye-to-eye...
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    Image 1 for
  • Replacement Leaf Spring for 1995 Ellis Tandem Axle Trailer
    In order to find if the 4-Leaf Double-Eye Spring # SP-210275 will fit your 1995 Ellis trailer you will need to know your axle capacity and measure your existing leaf springs. This particular leaf spring is for a 3,500 lb axle. The measurement you need is the spring eye to spring eye measurement. Keep in mind, your existing leaf springs will be slightly longer since they flatten over time. If you find that you are close to the 27" length of this spring then it will work as a replacement....
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  • Difference Between 3-Leaf and 4-Leaf Leaf Springs
    The only real difference between your current 3-leaf springs and the 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 27" Long # SP-210275 will be the thickness of the leaf spring stack. This will be 3/8" thicker when compared to what you have now. It may be possible that with the additional material and thickness they will hold up a little better and last longer. Overall though, they have the same capacity regardless of the number of leaves.
    view full answer...

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