1. Trailer Leaf Spring Suspension
  2. Universal Group
  3. Leaf Springs
  4. Springs
  5. Slipper Springs - 2 Inch
  6. 26-5/8 Inch Long
7-Leaf Slipper Spring w/ Hook End for 8,000-lb Trailer Axles - 26-5/8" Long

7-Leaf Slipper Spring w/ Hook End for 8,000-lb Trailer Axles - 26-5/8" Long

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Our Price: $103.14
Trailer Leaf Spring Suspension
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Shipping Weight: 25 lbs
SP-285275 - 26-5/8 Inch Long Universal Group Springs
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Slipper leaf spring acts as part of a trailer's suspension system by providing an attachment point for an 8,000-lb axle. Spring flexes to resist shock and also ensures a smooth ride. Includes bushing with 9/16" inner diameter. Lowest Prices for the best trailer leaf spring suspension from Universal Group. 7-Leaf Slipper Spring w/ Hook End for 8,000-lb Trailer Axles - 26-5/8" Long part number SP-285275 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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  • Reviews (18)
  • Q & A (11)
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  • Why etrailer?

Universal Group Trailer Leaf Spring Suspension

  • Leaf Springs
  • Springs
  • Slipper Springs - 2 Inch
  • 26-5/8 Inch Long
  • 8000 lbs
  • Universal Group

Slipper leaf spring acts as part of a trailer's suspension system by providing an attachment point for an 8,000-lb axle. Spring flexes to resist shock and also ensures a smooth ride. Includes bushing 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 bushing included
  • Pre-mounted hangers or aftermarket hanger kit (sold separately) required for installation
    • Eye of spring attaches to hanger mounted on trailer frame
    • Slipper end slides into hanger or equalizer


  • Quantity: 1 leaf spring
  • Spring capacity: 4,000 lbs
  • Axle capacity: 8,000 lbs
  • Length from center of spring eye to end of spring: 26-5/8"
  • Spring width: 2"
  • Eye diameter with bushing: 9/16"
    • Eye diameter without bushing: 1-5/16"
  • Leaf thickness: 3/8"
  • Number of leaves: 7
  • Additional dimensions: see table

Hook End Slipper Spring

Part NumberABCDEF

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.

Slipper leaf springs attach to hangers that are welded onto your trailer. The eye of this spring will attach to the front hanger with a suspension bolt. The hooked slipper end of the spring will slide into the rear hanger. If you have a tandem- or triple-axle trailer, the slipper end will slide into the equalizer that connects multiple springs. The shape of the slipper end of a leaf spring may vary slightly due to differences among trailer manufacturers. Because of this, it's important to check your leaf spring's slipper end before purchasing a replacement spring.

To mount this spring, you will need hangers, a suspension bolt, and possibly a spring keeper bolt, depending on the design of the rear hanger. If you are simply replacing a spring, you may still have hangers welded onto your trailer, but it would be wise to replace the bolts as they can experience wear. It is also 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-285 Universal Group Slipper Trailer Leaf Spring - 7 Leaf - 4,000-lb Capacity

Replaces 1403T3

Item # SP-285275

Customer Reviews

7-Leaf Slipper Spring w/ Hook End for 8,000-lb Trailer Axles - 26-5/8" Long - SP-285275

Average Customer Rating:  4.9 out of 5 stars   (18 Customer Reviews)

Slipper leaf spring acts as part of a trailer's suspension system by providing an attachment point for an 8,000-lb axle. Spring flexes to resist shock and also ensures a smooth ride. Includes bushing with 9/16" inner diameter.

- SP-285275

These are great springs. They fit my 8000lb axle perfectly. I've also used these on my 7000lb axle trailer. Shipping was fast and pro. I'm back up and running. Thanks.

Still not broken. I tend to run at max capacity of my trailer everyday so Ive really given them a workout.
Dustin D - 04/18/2019

- SP-285275

I love these things. I pull heavy loads day in and day out. 3-500 miles a day everyday. I was having to replace all the undercarriage bolts and shackles once a year due to wearing the bolts in half and making the shackle bolt holes oblong shaped. There was so much slop it worried me to be on the highway doing higher speeds. I did my one your inspection and there was very little wear. And that made me happy. Last time I had to stay up until 4am with one of my workers and cut everything out from under the trailer. Then re-weld and and install everything back. It's a serious problem when you don't have time to do it. This product will help save on downtime, labor and money.

- SP-285275

Received the shipment in excellent shape and in just a few days as I had paid for expedient shipping. Installed with out any problems.

- SP-285275

Great Company and great product!

- SP-285275

- SP-285275

- SP-285275

Very impressed, heavy duty I have a Kaufman Mini 5 Trailer car hauler and they use 5 leaf springs ,I upgraded to 7 leaf and major improvement,,handles the weight with no problem

- SP-285275

- SP-285275

Doing a great job so far. Been in service on our toy-hauler for about a year. Running them at 75% of the weight rating. No sagging or bending so far. The original 1.75 inch wide 7000 lb springs bent the first time we used our new toy-hauler.

- SP-285275

- SP-285275

We put this on a 16ft dump trailer we use commercially. It has been through a lot in one year and is holding up great.

- SP-285275

It is working fine, I am very happy with it. Thank you.

- SP-285275

Fast service

- SP-285275

Exactly as advertised. Perfect fit replacements, shipped promptly. I expect them to last 20 Years +. Good pricing, good product, good service. Can't ask for more.

- SP-285275

Good quality product. great customer service. Will order from them again

- SP-285275

Very good quality. Shipping super fa st!!!

- SP-285275

Product is exactly what the picture showed! Great product, worked great. Customer service was even better. Crystal was extremely helpful and made the purchase a breeze.

- SP-285275

Great product fast shipping and as always reasonable prices


Ask the Experts about this Universal Group Trailer Leaf Spring Suspension

  • How to Determine Correct Replacement Slipper Springs for Triple Axle Trailer With 8,000 lb Axles
    I can help you determine exactly what you need to replace the suspension in your triple axle trailer, although we don't have any type of database which has each part for each year, make and model of trailer that would tell us exactly what you have on your trailer, which means you'll need to do a bit of pretty simple measuring. Since you have a triple axle trailer, with three 8,000 lb axles you will need slipper springs for that axle capacity, for which we have two of that capacity. To...
    view full answer...
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  • Are Double Eye Leaf Springs Rated For 8,000 lb Axles
    Thank you for that detailed information and what I can tell you is that when choosing leaf springs, the actual number of leafs isn't the most important thing, the weight rating and center-eye to center-eye measurement is what you need to know. I have added a cut out from the help article on double eye trailer suspension which I highly recommend reading. We do not carry double eye springs rated for 8,000 lb axles and there is no way for us to know the rating of your currently installed...
    view full answer...
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  • Replacement 5 Leaf Slipper Spring for a Tandem Axle Dump Trailer with Two 6K Axles
    If your current springs have 5 leaves then going to a 7 leaf spring will increase the height of the trailer a little and make the trailer more susceptible to sway. Regarding capacity if you go with springs rated higher than what is required it will be very stiff and can cause a very rough ride on the trailer. For the best ride I recommend sticking with the recommended size # SP-232275 and I do recommend replacing all of the springs at the same time to avoid uneven wear.
    view full answer...
  • Will Higher Capacity Trailer Leaf Springs Provide a Smoother Ride
    You could go up in spring capacity if you wish, but it won't increase the capacity of your trailer. You'll still be limited to the capacity of whatever the lowest rated component is. Using springs that are rated higher than the load applied to them will result in a rougher ride. Be sure to replace both springs on a given axle at the same time. For a smoother ride, you'll be better off using properly rated springs. If you don't already have radial tires, switching from bias-ply will further...
    view full answer...
  • Slipper Spring Recommendation with 11-1/4 inches From Eye Center to Bolt Center
    We have the slipper spring part # SP-232275 which has 11-1/4 inches from the center of the eye hole to the spring pack bolt. It is also 26-5/8 inches long. It has a 7,000 lb axle capacity as well.
    view full answer...
  • Spacing Between Hangers With Slipper Springs for 8,000 lb Axles and Hanger Kit
    I checked for you and when installing the 7-Leaf Slipper Spring w/ Hook End for 8,000-lb Trailer Axles # SP-285275 with the Tandem-Axle Trailer Hanger Kit for 2" Slipper Springs - 12" Long Equalizers # APT6SE the distance between the front and center hangers will be 28-1/2", the distance between the center and rear hangers will be 29-1/2", the distance between the U-bolts will be 33" and distance between the center of the axle and trailer frame will be 4-1/2". I made a diagram for you...
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  • Recommended Triple or Quad Axle Suspension for Trailer Build
    Since you are building a trailer I first want to state that using quad axles isn't ideal. It will cause tire scrub as there becomes too broad an axle base for the trailer to track as nicely. That is why most trailers will use tandem or triple axles as needed for load capacity. If you just want to add the 4th axle for overbuild reasons it will bite you as you will need to replace tires more often. Most of the professional semi flat bed trailers that have the quad axles are for transporting...
    view full answer...
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  • Leaf Springs for 8K-Rated Axle
    We do offer both double-eye and slipper-type leaf springs for many axle weight ratings. You can see all of these leaf springs on the page I linked for you. In the 8K axle capacity we offer two slipper-type springs. Part # SP-161275 is a 6-leaf slipper spring that is 29-1/2-inches long. Part # SP-285275 is a 7-leaf spring that measures 26-5/8-inches. Both are 2-inches wide. Please note that leaf springs tend to stretch when they are worn so the length of the old spring you remove...
    view full answer...
  • Replacement Springs for Sanibel 3500 with Dual 8000-lb Dexter Axles
    Since you have 8000-lb axles, we know that they will use slipper springs and I can narrow your options down to 2 different sized replacement springs for your Sanibel 3500 5th Wheel. In order to choose the right one you'll need to determine the length of the spring. You can measure the length of the spring from the center of the eye on one side to the end of the spring. If you have 29-1/2" long springs you will need # SP-161275 . If you have 26-5/8" long springs you will use # SP-285275...
    view full answer...
  • Parts Needed for Home Builit Triple Axle Flat Bed Trailer
    Thanks for all of the info on the parts you're looking for. From those specs I recommend the following for you: Wheel and Tire combo # A16RTK8SMPVD Buyer's Products Square Jack # 3370091415H Curt Lunette Ring # C48560 Electric Drum Brakes for 7,000 pound Axles # AKEBRK-7-SA
    view full answer...
  • What Would Cause the Front Eye on my Slipper Springs to Unwind or Loose its Shape
    The load or hitch height would not affect the front spring eye. For it to come unwound or loose its rounded shape there has to be some kind of rearward force pulling it out of round. This would shift the front axle effecting the equalizers and the tire spacing. The best bet here is to replace that front set of slipper spring and inspect it regularly to determine when the damage has occurred. We carry a good selection of slipper springs like the 7-Leaf Slipper Spring w/ Hook End for...
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Cole B
Installed by:
Cole B
Employee Alexander C
Written by:
Alexander C

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