1. Trailer Leaf Spring Suspension
  2. Universal Group
  3. Leaf Springs
  4. Springs
  5. Double Eye Springs
  6. 27 Inch Long
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
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Our Price: $66.88
Trailer Leaf Spring Suspension
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Universal Group Springs - SP-210275
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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 - 27" Long part number SP-210275 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (153)
  • Q & A (80)
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  • Why etrailer?

Universal Group Trailer Leaf Spring Suspension - SP-210275

  • Leaf Springs
  • Springs
  • Double Eye Springs
  • 27 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.


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: 1,750 lbs
  • Axle capacity: 3,500 lbs
  • Length from center of spring eye to center of spring eye: 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
SP-21027513-1/2"14"27"2-3/4"


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

Replaces PR427






Customer Reviews

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

Average Customer Rating:  4.8 out of 5 stars   (153 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.

- SP-210275
by:

Product shipped quickly and as advertis ed. 909042



- SP-210275
by:

The springs were just what the description said, they fit perfect. very happy, this is the second set we have purchased, and will continue to buy our trailer parts from etrailer. and only took 4 days to ship to Boston Ma. 901195



- SP-210275
by:

865972



- SP-210275
by:

The u bolts could have been about a half inch longer. It worked but easy enough but could have been easier 856477



- SP-210275
by:

were narrower than original,but worked. 856363



- SP-210275
by:

brackets came in with leaf spring ordered, did a test fit is the same as the older ones that I have which are stainless steel u-bolts. I will keep these as a spare and coat these with a rust inhibitor/ paint. 837354



- SP-210275
by:

Quality part, made to specs. 837322



- SP-210275
by:

Quality part, made to specs. 837321



- SP-210275
by:

Worked as advertised, good quality product. Shipping was fast as well and the folks at etrailer maintain great communication. 828944



- SP-210275
by:

Great product! Fit perfectly! 815539



- SP-210275
by:

Great product- 808964



- SP-210275
by:

The order was delivered in 4 days to my surprise. Everything was as ordered. Alex was great. I'll be on the lake tomorrow. Thanks. 814389



- SP-210275
by:

The set of springs I purchased for a dump trailer definitely fixed the problem of one broken spring and one very worn out spring. The springs, axle u-bolts were all the perfect fix and replaced perfectly. Ordering another set now AND a rear axle I was so pleased with the outcome. Thanks etrailer! 806058



- SP-210275
by:

All products were as ordered. Plan on building custom trailer for custom smoker. Taylor M represents your company very well. Will continue to use your store when needed and will definitely recommend to others. 785128



- SP-210275
by:

These leaf springs fit perfectly..work well for my utility trailer.....I would recommend this product for anyone needing to replace broken leaf springs... 765792



- SP-210275
by:

Bought these leaf springs for a DIY kayak trailer I had built, after a year in I have nothing but great things to say about them, the fit was exactly what I was looking for and would highly recommend this company to anyone looking to upgrade their trailers. 733849



- SP-210275
by:

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. 722172



- SP-210275
by:

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. 720720



- SP-210275
by:

Good product and great price. Shipped in a timely matter 705193



- SP-210275
by:

Been a year and the are holding up well. 703427



- SP-210275
by:

Great product and quick delivery. 688420



- SP-210275
by:

The springs I purchased are just what is needed. The description given is exactly what was received. Good quality from the looks of them. The only change I would like to see would be made in USA !!, of course then they would be too expensive. The service department is also right on top of things also, they kept me informed as to the status of my order each step of the way. A satisfied customer. 682376



- SP-210275
by:

All my ordered parts arrived have not installed yet but so far perfect experience. 681244



- SP-210275
by:

worked perfect,great price, fast shippi ng 675313



- SP-210275
by:

Fit perfectly 665445


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Show More Reviews

Ask the Experts about this Universal Group Trailer Leaf Spring Suspension

  • How To Determine Trailer Leaf Spring Replacement Based on Axle Capacity and Other Components Used
    For your replacement leaf spring, there are a few things to consider. The number of springs in the stack doesn't determine the capacity, so you will need to know the capacity of your axle so you don't have springs that are too stiff or not strong enough for your application. For instance, if your springs are for a 3,500 lb axle, then the 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 27" Long # SP-210275 may be the correct replacement even though it is 4 leaf versus 6 because the...
    view full answer...
  • Torque Specs for U-Bolts with 3,500 Pound 4-Leaf Double-Eye Springs
    To use with the 4-Leaf Double-Eye Spring for 3,500 Pound Trailer Axles # SP-210275 I recommend the U-Bolt Kit # APUBR-1. The manufacturer doesn't list any specified torque specs for this kit but based on the size of the hardware (1/2 inch diameter nuts) you will want to torque them down to about 70 foot pounds. I have attached an installation video that you can also take a look at.
    view full answer...
  • Replacement Leaf Spring Recommendation for a Single Axle Ranger Boat Trailer
    The way to pick out a leaf spring for a trailer is to go with the one that will match the axle capacity needed and is the correct length. For you the part # SP-212275 is the correct one to use. It is for a 4,800 lb axle (close enough) and has an overall length of 25-1/4 inches. Leaf springs tend to stretch out over time so yours new would have been this exact length most likely. The height of this spring is 3 inches.
    view full answer...
  • Difference Between Measurements on 3,500 lb Double Eye Leaf Spring
    The axle should mount over the center of the 27" 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles # SP-210275. The measurements you see in the accompanying diagram are different because "A" is measured in a straight line from the center of the spring eye to the center of the spring while "B" is the measurement of the curve from the spring eye to the center of the spring, like if you laid a tape measure down on the spring itself, if that makes sense. I have added a link to a video...
    view full answer...
  • Picking Between 27 inch and 25-1/8 inch Long Leaf Spring for Trailer
    There wouldn't be a noticeable difference between a 25-1/8 inch leaf spring and a 27 inch spring. But since the 25-1/8 inch size # SP-212275 is more common it would be what I would go with in case you ever had to replace them in the future. This would make your future replacement a little easier.
    view full answer...
  • 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...
    view full answer...
  • How Far Apart Should Hangers Be on My Custom Built Trailer With 27" Leaf Springs?
    Generally speaking you want the distance between your hangers to be about 1/2" shorter than your leaf springs, since your shackle straps will allow for some movement on the springs. The hanger kit you want to use depends on how much clearance you need for your axle. A good kit that will give you about 4-1/2" of clearance from the center of your axle to the bottom of the trailer frame is the # APS5 . This kit contains the front and rear hangers as well as shackle straps and bolts needed...
    view full answer...
  • Recommended Leaf Springs for Vintage Trailer
    The 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 27" Long # SP-210275 will work with your vintage trailer. It looks from the photo like you would also need the Replacement U-Bolt with Nuts for 2" Wide, Square Trailer Axles - 9/16" Diameter # 175211 and the U-Bolt Plate - 2" Wide, Square Trailer Axle - 1-3/4" Wide Spring - 9/16" Bolts # TRTP200175. You will need to reuse your shackle straps, but you can use the Wet Equalizer Bolt with Locknut and Grease Zerk for Double-Eye Springs...
    view full answer...
  • Suspension Solution for Trailer with 3,500 lb Axles to Smooth Out Ride Quality
    Longer springs really aren't going to smooth your ride quality out a noticeable amount. Trailer suspension is typically pretty bouncy or rough due to the fact that there is no shock on the springs to dampen or slow the movement of the suspension. The solution for that is a shock kit like the part # LC281255 which is designed to fit 2-3/8 inch diameter axles like what are commonly used for 3,500 lb axles.
    view full answer...
  • Availability of Double-Eye Leaf Spring with 30-Inch Eye-to-Eye Measurement
    The double-eye leaf springs we offer are all 1-3/4-inches wide and are available in lengths from 20-1/4-inches for 2000-lb axles up to 27-inches for 3500-lb axles, part # SP-210275. Please see the included link. Slipper type springs (with a single eye) are offered in lengths of 30-inches and higher and these are intended for 9000-lb and higher axles. A link to all slipper springs is included for you as well. Do note that a very well-worn spring can become slightly elongated from use....
    view full answer...
  • What to Consider When Replacing a 3,000 Pound Single Axle Trailers Leaf Springs
    If you use a higher rated leaf springs on a lower rated trailer they will work but will cause stiffness in your ride quality. This is due to the trailer not being under the heavier weight therefore less flex of the springs, using a higher rated spring will not increase the capacity of the trailer because the trailer itself cannot support more than the stated 3,000lbs of weight. When replacing leaf springs you will want a new u-bolt kit like # APUBR-1, the correct shackle bolt like #...
    view full answer...
  • How to Pick Out Leaf Springs for 2000 Fleetwood Toy Hauler SUT26A
    You will want to 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 is slightly shorter (around 1/2 inch) to compensate for the sag and wear of the old leaf spring. Once you know the length you need check out the chart I attached that has all of the springs we carry. The lengths are in the column A.
    view full answer...
  • Can the Trailer Leaf Springs PR427 Install Above and Below Trailer Axle
    The leaf springs part # SP-210275 that you referenced can be mounted above or below the axle. The distance from the center of the spring eyes to the bottom of the spring measures 2-3/4 inches and this spring has the standard 1-1/2 inches of deflection.
    view full answer...
  • How Far Apart From Each Other Should Hangers be Welded for Leaf Springs on Trailer
    As a general rule, you will want the distance between the hangers on a leaf spring suspension system to be around a 1/2 inch shorter than the length of your leaf springs. This will allow for some movement with the shackle strap. For example, if you have Double-Eye Springs like # SP-210275 that are 27 inches long, you will want to mount the hangers about 26-1/2 inches apart from each other.
    view full answer...
  • Estimated Weight rating for 1-1/2-Inch Square Trailer Axle
    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...
    view full answer...
  • Spring Height Measurement of Trailer Leaf Spring SP-210275
    The measurement is from the exposed face of the first leaf (the longest leaf that the eyes are mounted on) to the center of eyes.
    view full answer...
  • Picking Out Trailer Leaf Springs for Trailer with 30 inches between Hangers
    To pick out the correct suspension components for a trailer you want to do it by most importantly picking out the springs that closely match the capacity of the axle capacity needed. That is priority one. For example if you were using the springs part # 1020, # SP-219275, # SP-111275, # SP-218275, # SP-115275, or # SP-220275 with the hanger kit part # APT5 that comes with equalizers that are 7-3/4 inches long you would want the hanger spacing to be 29-1/2 inches which is pretty close...
    view full answer...
  • Is There an Advantage to Going to a Higher Rated Leaf Spring with a 3,500 lb Trailer Axle
    There really wouldn't be a benefit. It would unnecessarily stiffen up the suspension. You still would be limited by the 3,500 axle capacity so you wouldn't gain any capacity while increasing the stiffness of the trailer suspension. Best option is to stick with 3,500 lb leaf springs. For 3,500 lb springs we have the part # SP-210275 for a 27 inch long spring, part # SP-212275 for a 25-1/8 inch spring, or part # SP-216275 for a 23-1/8 inch long spring.
    view full answer...
  • What is Minimum Distance Between Tandem Axle Tires
    As a general rule of thumb the minimum safe distance between front and rear tires on the same side of a tandem axle trailer is 4 inches. If you are at that distance currently there would be no reason to increase the distance. Tire failure is usually caused by a few things. It can be from overloading the trailer, improper tire inflation, and/or exceeding the speed rating for the tire. You should verify that the tire capacity you have for you trailer is adequate for how much your trailer...
    view full answer...
  • Double Eye Leaf Springs for Boat Trailer, Stretched Out
    Before you can pick out a set of leaf springs for your boat you need to find out the weight rating of your trailer axle. Then you will need to purchase leaf springs that are each 1/2 of the axle rating. The # SP-210275 is rated for 1500 pounds so if your boat trailer axle is a 3000 pound axle then I would say that # SP-210275 is the correct leaf spring for your axle. Due to wear and different manufacturing tolerances the spring dimensions will be slightly different especially for length...
    view full answer...
  • Torque Spec For Leaf Spring Shackle Bolts
    There is no specific torque rating for shackle bolts. You'll want to ensure that the bolts you use are long enough so that when installed you will have at least 2 threads protruding from the nut. Make sure that the bolt you're using has a lock nut, like part # 166081. If the bolt you are using has knurls at the bolt head, tighten the bolt down until the knurls go through the shackle link or hanger and the bolt head is flush. Then back off the nut slightly so that all of the components are...
    view full answer...
  • Leaf Spring Recommendation for 1966 Aristocrat Lo-Liner
    I believe the part # SP-210275 will be your best option. It is 27 inches in length and is designed for 3,000 lb axles which is a bit more than what you would need, but would still work fine. The only spring we have that is exactly 26 inches is the part # SP-256275 which is for 4,500 lb axles.
    view full answer...
  • Recommended 27 inch Leaf Spring for my Trailer
    If you are looking for a Leaf Spring that is 27-3/4 inches long, the closest that we offer in length is 27 inches. If your springs are worn, it is possible they were originally 27 inches long and have flattened out over time. We have a Double-Eye 4-Leaf Spring # SP-210275 that is rated for 3,500 lb Trailer Axles. This spring measures 1-3/4 inches wide and the leaf thickness is 3/8 of an inch. We also have the 5-Leaf Slipper Spring with Hook End # SP-160275 which is rated for 6,000 lb...
    view full answer...
  • Thickness of Trailer Leaf Springs SP-210275 and SP-219275
    I went and grabbed a # SP-219275 from our warehouse and measured the thickness of the leafs of the spring where it would attach to an axle and found that it measures exactly 1 inch thick. The distance from the center of the spring eyes to the bottom of the spring measures 3 inches and this spring has the standard 1-1/2 inches of deflection. The thickness of the leaf spring # SP-210275 is 3/4 inches. The distance from the center of the spring eyes to the bottom of the spring measures...
    view full answer...
  • How to Adapt CE Smith Trailer Axle Kit CE33201GA-HUB for 55-1/2-Inch Spring Spacing
    We do not have axle kits with a 55-1/2-inch spring center spacing but you can still use an axle like # CE33201GA-HUB so long as it is rated properly for your application simply by having two steel spacers like # 01077-011 welded at the appropriate positions on the axle tube. You may just need to enlarge the holes to match the size of the nuts on the spring stacks before you have them welded on. It is not a good idea to drill new holes in the axle as this could reduce its capacity. This...
    view full answer...
  • 30 inch 1,500 lb Leaf Spring Recommendation
    The best recommendation I could make for you would be a 1,500 lb spring like the part # SP-210275 and have the hangers moved so that they accommodate this 27 inch spring by a qualified welder. I attached a review video and an FAQ on trailer suspension for you to check out as well.
    view full answer...
  • How to Select Correct Leaf Springs for 1959 Camper Trailer
    I can help you to determine what you need to know to pick the correct leaf springs for your trailer but you are very much on the right track in terms of the information you'll need. Start with the length from the center of one eye to the center of the other eye, which you said was 30 inches. Even keeping in mind that springs are going to stretch a bit over time, that is a quite a long measurement. The longest we have is the 4-leaf double-eye spring # SP-210275 which measures 27" from...
    view full answer...
  • How to Choose Correct Leaf Spring Length for 1958 Spartan Trailer
    When choosing a replacement leaf spring for your trailer suspension you will want to choose a leaf spring that is compatible with your hangers (double-eye or slipper spring) and that has the proper axle weight capacity rating. Because leaf springs tend to flatten out as they get older and more worn out (making them longer), you're going to find that your measurements aren't the exact length of springs you'll use; it's most important to get close to the length while using the correct...
    view full answer...
  • Leaf Spring Replacement Recommendation for a Boat Trailer with a 3000 lb Axle
    The 4-Leaf Double-Eye Spring # SP-210275 that you referenced that is 27 inches long should work well for you. Typically you want the spring a little bit shorter than the hanger distance (about 1/2 inch) but you're close enough that it should work just fine. I attached an FAQ article on trailer suspension for you to check out also.
    view full answer...

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Info for this part was:

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Expert Research:
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Expert Research:
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Written by:
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