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  1. Trailer Leaf Spring Suspension
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4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 25-1/8" Long

4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 25-1/8" Long

Item # SP-212275
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Trailer Leaf Spring Suspension
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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. Lowest Prices for the best trailer leaf spring suspension from Universal Group. 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 25-1/8" Long part number SP-212275 can be ordered online at or call 1-800-496-5010 for expert service.
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Universal Group Trailer Leaf Spring Suspension - SP-212275

  • Leaf Springs
  • Springs
  • Double Eye Springs
  • 25-1/8 Inch Long
  • 3500 lbs
  • 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: 25-1/8"
  • Spring width: 1-3/4"
  • Eye diameter with bushing: 9/16"
    • Eye diameter without bushing: 11/16"
  • Leaf thickness: 5/16"
  • 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-212 Universal Group Double Eye Trailer Leaf Spring - 4 Leaf - 1,750-lb Capacity

Replaces PR4B

Customer Reviews

4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 25-1/8" Long - SP-212275

Average Customer Rating:  4.9 out of 5 stars   (586 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.


Broken spring on our 33 foot Salem trailer halted our vacation. etrailer had the exact spring replacement for our Salem (used the 'select vehicle' guide), and I received them within 2 days of ordering as promised. Did the installation myself and found them to be an exact fit - glad I ordered extra hanger bolts. Our vacation is back on! Thank you for all your help!!


Perfect fit, easy to install, nice upgrade on a 2018 Tracker Bass Boat trailer that originally had just a single taper leaf.


Good item fit was direct replacement for my original leaf springs.


Looks like HD Quality. Easy install and perfect fit. I replaced all four on my tandem and it took about 30 minutes per side to install. Now getting the 25 year old original parts off the trailer frame and axles is a chapter in its self. I ordered the Never Fail bushings and hardware kit, u-bolt kit, along with new equalizers to go with the new springs. Good thing too because every thing was worn badly. The new parts gave me at least 2 more inches of space between the frame and the axles. The true test will be when I load it up with logs and hit the road. I added some pics to give you an idea of what I had before and 1 after.


Positive ExperienceI recommend etrailer. the price was better than I'd seen locally or online, although it happens that the size and type I needed was a particularly good deal. The service and shipping were surprisingly prompt, and when the box arrived, everything was as advertised.
While replacing four leaf springs is about as much fun as shopping for socks, etrailer at least made ordering a positive experience.
I actually found the video helpful as well. I've included a picture of what mine actually looked like. A breaker bar is a very handy tool.

I have a question, Ive. Measured my springs to be 26. 14 to the center of each bolt, however the springs are nearly gone so can I safely say that my springs measurement should be 25 1/4?
-- comment by: DAVID D - 08/23/2013


I make my living with my 2008 cargo trailer. On the way to a job, my leaf springs broke on one side and as I nursed the trailer back home afterwards, the other side broke. I ordered all the parts needed from etrailer using their measuring guidelines to get the correct leaf springs and hardware. Having never replaced leaf springs before made me nervous but given the fact that etrailer's website is very comprehensive, I found the correct parts that I needed easily. My parts were delivered quickly and I had the old broken springs off and the new ones installed and was back on the road with only a couple days of down time. I'm very happy with etrailer and will recommended them again and again.


Installed easily, as expected, and are so far working fine on my single axle 18x8 dove tail utility trailer. Just hauled about a ton of pavers with no problems. Springs are made in China.


I found etrailer online when I searched for leaf springs for my landscape trailer. I am very pleased at the fast delivery and wide range of good quality trailer products and the helpful knowledge etrailer has on it's website. I replaced my leaf springs on my trailer. The new springs I ordered was a perfect fit.


Replaced both leaf springs, hangers, and shocks on a Dexter 3500lb axle. Entire process took just over an hour.


Just what I needed, but more importantly the service was fantastic as usual.


It is always a pleasure do business with etrailer


I purchased a set of these leafs for a utility trailer and they worked perfectly.

A year later and holding up just fine. I installed these springs on my ATV trailer that gets a ton of work literally. With the stones and firewood Ive hauled, they have worked just fine.
Kevin - 05/07/2022


I bought springs, shackle bolts, and u-bolts and plates. Everything was great and fit perfectly. Only issue were the u bolts which were not galvanized. However, at a local trailer store, I bought galvanized U bolts for $4.50 each.
For the DYIers, taking the old ones off took more than 4 hours for each side. My existing shackle bolts were so heavily rusted that I had to cut three off with a hack saw. Difficulty was confined space to operate hack saw with boat still on trailer. However, reassembling the new springs was less than 45 minutes each side.
Must have tools are large diameter 3/4-13/16-7/8 deep sockets (6 point), 2 2 foot long breaker bars and a can of PB blaster.
For safety: Good quality jack stands, minimum of 3--don't rely on the front trailer jack as it may roll.
By the way, I did these myself and I am 64 years old.


Easy, straight forward order. Springs work great!


First I want to thank you for NOT sending out a review question 2 days after shipping the product !
Everything for my new springs came in a timely manner and were as advertised. I did have to call because the springs I ordered were too stiff. No problem I returned them and got the ones i should have ordered. Trailer rides much better than when it was new.


It was a great investment. I follow a group of trailer owners who have posted their factory springs breaking/snapping. I like that we can grease them before long trips. The springs gave me the peace of mind I needed before heading out on a cross country trip.

Ronald - 09/15/2021


Perfect fit for my trailer. Seem to be well built. Though they are stamped China. But what you gonna do right. If you need them, you need them. Been on the trailer for a couple months now. And seem to be holding up to the abuse.


Springs arrived when they said it would. Fit perfectly. Have not taken the trailer out yet - tomorrow


Not much to say about this. I broke a spring while traveling through heavy road construction on I-80 in Northern Nevada. I ordered a new spring from etrailer on the Internet. It arrived in two days and I discovered I had ordered the wrong size when I tried to install it. I immediately contacted etrailer and they sent a new spring immediately. It arrived in three days later. It was an exact replacement and bolted right in and I was back on the road. What else can I say? Great product and great service!


Parts fit well, I have use ETrailer in the past, they always deliver.


They look good and better than what came off trailer. I like also have a clip around the leaves. I will move the AZ spring to left rear do to more arch for clearance. Will add new nylon bushing while doing the change. I am very happy with this order. Thank You for your help over the phone for this order.


These guys made ordering easy! No long drawn out questions. Shipping was fast and right. If I ever need anything of this nature again I will definitely use them again.


I need new springs for a cargo trailer i am converting to a portable observatory for my telescope. and they had the part and it came in the mail in good time. the springs fit perfectly. only regret is I need more trailer parts to complete the project and I could have saved on shipping had I ordered it all at once.
Thank you for helping get the order quicker without extra coast.


Installed easily on my trailer. My trailer sits level again and I expect a much smoother ride next time I haul cabinets on it. One of the old leaf springs broke. I replaced both. Originally I ordered the wrong size but Alexis in customer service was extremely helpful in getting the correct size reordered and helping me return the wrong size ones.

Its been a year and the leaf spring is still working great! Ride is smooth and level!
James - 07/28/2021


Service was great and got the right part on time

Show More Reviews

See what our Experts say about this Universal Group Trailer Leaf Spring Suspension

  • How To Determine the Weight Rating of a Trailer Axle For Leaf Spring Replacement
    The trailer will have a plate or sticker on it that will list the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that will list the weight capacity. Since the trailer you have is an older trailer it might be missing the plate or be very hard to read. You can also tell the weight capacity of the axle by measuring the diameter of the axle. A 2,000-lb axle will have an axle diameter of 1-3/4 inch. A...
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  • 5th Wheel Trailer Pulls Nose High Are Spacers Available to Level with My 2011 2500 Dodge Ram Diesel
    The first thing I would do in your situation is take the truck and trailer to your RV dealer and have them check out your setup. Typically 5th wheel trailers are set up to tow a bit pin high to allow for more weight transfer to the rear most axle or axles on the trailer. If possible, you can adjust the trailer pin box closer to the underside of the trailer loft, or reduce the height of your fifth-wheel hitch head in the bed of your truck. Be aware that adjusting the trailer too close to...
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  • How Are Trailer Leaf Springs Weight Capacities Rated
    There is usually two capacities listed on a leaf spring. The spring capacity and the axle capacity. For the 4-Leaf Double-Eye Spring # SP-212275 that you referenced it has a spring capacity of 1,750 lbs meaning that the individual spring can handle 1,750 lbs. The axle capacity is 3,500 lbs meaning that when you use two springs the combined capacity is 3,500 lbs. I attached an FAQ article on trailer suspension for you to check out also.
    view full answer...
  • How To Determine Weight Capacity of Double Eye Leaf Springs on Trailer
    The best way to determine the weight capacity of your leaf springs would be to check the weight rating of the axle on your trailer. The trailer will have a plate or sticker on it that will list the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that will list the weight capacity. You can also tell the weight capacity of the axle by measuring the diameter of the axle. A 2,000-lb axle will have an...
    view full answer...
  • Which Leaf Springs for my 5x10 Trailer with a 3,500 Pound Axle
    There is a lot of variance in how much a spring will stretch. A trailer that carries a lighter load or is not used frequently will not have as much spring stretch. The springs you were looking at, part # PR626, are made for trailers with 4,500 pound axles. It might result in a bit rougher of a ride. The double eye springs we carry for a 3,500 pound axle are 25-1/8 inch long. At six years of age, I can see the springs stretching 3/4 of an inch. We have two springs that would work for you,...
    view full answer...
  • Replacement Leaf Springs for 3500-lb Tandem Axle Trailer
    We can help you select replacement leaf springs for your tandem axle boat trailer. You can click on the link provided to select your axle rating (3500-lbs) and see springs rated for that axle capacity. Then just choose the type of spring you need, double-eye or slipper. You can also sort the results based on spring dimensions, number of leaves, etc. For example, if you need a 3500-lb-rated double-eye spring with 3 leaves that is 25-1/8-inches long (eye to eye) then use part # SP-212275....
    view full answer...
  • How To Determine Correct Replacement Double Eye Leaf Springs for Camper Trailer
    The axle capacity and a couple of measurements from your existing leaf springs will help us determine the correct replacement springs for you. It is best to replace all springs at the same time and to make sure they match the capacity of the trailer axle. Your axles' capacities should be listed on a sticker located near the center of the axles. The measurements from your springs that are helpful when searching for replacements are (A) the length from center of one eye to the center of...
    view full answer...
    Image 1 for
  • Selecting Replacement Leaf Springs for Rockwood Tent Trailer
    You definitely want to replace both leaf springs on your trailer's axle to avoid tracking issues. It is almost impossible to tell the actual length of a leaf spring when it is installed and under load. It is far better to remove one and then measure it, keeping in mind that a really old and/or well-worn spring can actually become elongated from years of use. It is possible for a leaf spring like # SP-212275 to become 1/2- to 3/4-inch longer after many years of use. You also want to ensure...
    view full answer...
  • 3,500 lb Trailer Axle Leaf Spring Recommendation for a Single Axle Travel Trailer
    When picking out leaf springs for a trailer the number one priority is to pick out the proper weight rating springs for the trailer. The reason being that hangers can be moved if needed. If your current leaf springs are 25-1/4 to 25-3/4 inches in length and the hanger spacing works as-is then the # SP-212275 would work just fine. Otherwise you could move the hangers out a bit and it would be just fine.
    view full answer...
  • Should Trailer Leaf Springs be Replaced in Pairs
    When in comes to replacing leaf springs on trailers we recommend that you replace them in pairs so you are using the same springs on each side of the axle. I attached a help article on trailer suspension leaf springs for you to check out as well.
    view full answer...
  • How to Determine Axle Weight Rating from Axle Diameter and Bearings
    Usually a 3-inch diameter trailer axle will carry a weight rating of 6000-lbs or 7200-lbs. A 3-1/2-inch axle can carry a rating as high as 8000-lbs. The hub/drum assemblies we offer that use inner bearing 25580 and outer bearing LM67048 are shown on the linked page. These hubs work on axles rated for 5200-lbs, 6000-lbs, or 7200-lbs. It is necessary that a new hub use the same bearing set as the one it replaces. The hubs shown on the page come in three different wheel bolt patterns, 6 on...
    view full answer...
  • Replacement 3,500 lb Axle Leaf Spring Recommendation for a 19 Foot Trailer
    The closest matching leaf spring we carry is the part # SP-212275 that you referenced as it is a 3,500 lb axle spring with 4 leafs. Only thing is it is a bit shorter than what you currently have a 25-1/4 inches. Old springs tend to stretch out, but you may have to move your suspension hangers at worst. These will work best for you one way or the other.
    view full answer...
  • Replacement Leaf Spring for 1994 Road Clipper Car Hauler Mfg. by Diamond C Trailers
    Yes, the part # SP-212275 would fit your trailer and would work well. It is the correct capacity at 3,500 lbs and is just a tiny bit shorter than your current spring which is normal. Trailer springs tend to flatten out and stretch out over time so yours probably were 25-1/8 inch when new. The second dimension you are looking for is 12.5625 inches.
    view full answer...
  • Can Two 3-Leaf Springs and Two 4-Leaf Springs be Used Together on a Tandem Axle Trailer
    Yes but you will want to put the matching springs on the same axle. The extra leaf in the 4 leaf springs does not throw off the height equivalency much at all so I would not worry about it. Ideally you would want them all to be the same but given that they are only off by a fraction of an inch (the height of a single leaf) and because the springs are all the same capacity you won't have anything to worry about.
    view full answer...
  • Picking Out Replacement 3,500 lb Spring For Trailer
    The springs allow the trailer to sit level even though they have differing amount of leaves because the axle sits on top of the spring and the leaves are added to the bottom of the springs. That being said we strongly recommend you run the same springs on both sides of the trailer and replace them in pairs. What you would then want to do is measure the springs you have when there isn't a load on the trailer. If 26 inches is about what you have then the correct spring would be the part...
    view full answer...
    Image 1 for
  • How to Measure to Select Correct Replacement Trailer Leaf Springs
    It is difficult to accurately measure the length of a leaf spring when it is still under tension in the suspension system. You will get a more accurate eye-to-eye length measurement if you remove the spring from the suspension. The leaf springs we offer for 3500-lb-rated axles come in several lengths, including the longest at 27-inches. While it is possible for springs to become elongated from use a 3-inch gain in length is not possible. Well-worn springs can become up to 3/4-inch longer...
    view full answer...
  • What is the Weight Capacity For Leaf Springs in the Picture
    From the picture, it looks as if you have six leaf, double eye, leaf springs. In order to determine which leaf spring you have, a few measurements will need to be taken. The first measurement is the distance from center eye to center eye as noted as distance -A- in the picture. The second measurement is the from the center of the spring to the center of the eye which is measurement -B-. The third measurement is from the center of the eye to the center of the spring as is figure -C- and...
    view full answer...
    Image 1 for Image 2 for
  • How to Determine Weight Capacity of Trailer Axle
    To find the load capacity for your axle you should look on the trailer VIN plate or sticker that lists the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that will list the weight capacity. You can also tell the weight capacity of the axle by measuring the diameter of the axle. Here is a list that will show the axle weight capacity based on the axle diameter: Typical Axle Diameters Based on Axle...
    view full answer...
    Image 1 for
  • How to Pick Out Leaf Springs for a Trailer
    Sounds like you replaced your slipper spring with a double eye spring. Either spring style will work just fine. Whichever style you prefer or think would be easier to convert your trailer to would be your best solution. When replacing trailer leaf springs we strongly recommend you replace them in pairs. I would urge you to get a set of matching properly rated springs for your trailer as soon as possible. If you look on the frame of your trailer there should be a plate with the trailer...
    view full answer...
  • Troubleshooting Leaf Spring Shackles that Angle the Wrong Direction Without a Load On the Trailer
    It sounds like you have the correct spring, part # SP-212275. As it is the correct length and weight capacity that you need. I would try putting a load on the trailer first to see if the shackle flips the way it is supposed to face. The spring should flatten out quite a bit once there is some weight on it and the shackle should then angle the correct direction.
    view full answer...
  • How Many Leaves Does the Leaf Spring # SP-212275 Have and is it Sold Individually
    The 4-Leaf Double-Eye Spring # SP-212275 that you referenced has 4 leaves and is sold individually. I attached a review video for you to check out as well.
    view full answer...
  • How Thick are the Leaves in 4-Leaf Double-Eye Spring For 3,500 Pound Trailer Axles, # SP-212275
    I went out to the warehouse and pulled a 4-Leaf Double-Eye Spring, # SP-212275, to measure. At the center of the spring where the bolt is, the total width, including the bolt, is 2 inches. The width of just the leaves is 1.30 inches. Each leaf is approximately 0.30 inches thick.
    view full answer...
  • How to Pick Out Replacement Leaf Springs for a Trailer with Rusty Leaf Springs
    The bolt running down the middle of your leaf springs will keep them together, but if they are showing as much rust as you said they are it would be a good time to replace your springs. The clips are designed to help keep the leafs together although they are already connected at the bolt. You will need to measure the length of your springs from one eye to the other, the width of the springs and determine the capacity of springs you need to pick out the correct springs. I attached a page...
    view full answer...
  • Troubleshooting Trailer Axle Equalizer that Touches Trailer Frame
    The first and easiest thing you should check is that the trailer is being towed level. If the trailer is nose high or low that can cause the equalizers to not sit level. You will need to select the correct rise/drop ball mount so that the trailer sits level. I attached an FAQ on how to do this. If there is significantly more weight on one of the trailer axles you will need to adjust the cargo in the boat or the way the boat is loaded on the trailer to get the proper amount of tongue weight...
    view full answer...

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