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

Item # SP-285275

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Trailer Leaf Spring Suspension

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Shipping Weight: 26 lbs

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SP-285275 - 26-5/8 Inch Long Universal Group Springs
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  • Springs
  • Leaf 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. 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 800-298-8924 for expert service.

  • All Info
  • Reviews (10)
  • Q & A (7)
  • Videos (1)
  • Photos
  • Why etrailer?

Universal Group Trailer Leaf Spring Suspension - SP-285275

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

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

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Universal Group Trailer Suspension - Leaf Spring Suspension - SP-285275 Review

Today we're going to be taking a look at the seven leaf slipper spring for eight thousand pound trailer axles. This is made from a very strong and durable steel construction. It's going to flex to absorb road shock and provide a smooth ride, and it's going to help reduce wear and tear on your trailer. It's going to ensure a level ride on bumpy and uneven surfaces. Now this is designed to mount to the trailer frame with hangers or a hanger kit, those items are sold separately. It does come with the bushing here at the eye. That's going to have a eye diameter inside that bushing of nine sixteenths of an inch.

Now, as you can see here, the number of leaves that the spring contains is going to be seven. The spring width from edge to edge, that's going to give us a measurement of right on two inches. The spring capacity is four thousand pounds, so the axle capacity is eight thousand pounds, four thousand pounds per leaf spring. Now, we do want to recommend that in order to ensure proper axle alignment and suspension performance, that your leaf springs should always be replaced in pairs. Few length measurements I'm going to go over with you real quick. Measuring from the center of the eye to the end of the spring, so measuring center of eye to end of the spring is going to be about twenty-six and five-eighths of an inch.

From the center of the eye you can see how on this end how it kind of curves up. If we measure from the top of that bend, so about to this point here, that's going to give us a measurement from the center of the eye of about, that looks to measure pretty close to twenty-four and a half inches. That's going to do it for today's look at the seven leaf slipper string for eight-thousand pound trailer axles.

Customer Reviews

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

Average Customer Rating:  5.0 out of 5 stars   (10 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

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. 567830

- SP-285275

Good quality product. great customer service. Will order from them again 527123

- 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. 575485

- 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. 504266

- 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. 639528

- SP-285275

Very good quality. Shipping super fa st!!! 509872

- 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. 508499

- 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. 497707


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

Great product fast shipping and as always reasonable prices 490258

- 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 322344


Ask the Experts about this Universal Group Trailer Leaf Spring Suspension
Do you have a question about this Trailer Leaf Spring Suspension?

  • 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 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...

  • 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...
    view full answer...

  • 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...

  • 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...

  • 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...

  • 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...

Do you have a question about this Trailer Leaf Spring Suspension?

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Info for this part was:

Expert Research:
Michael L
Expert Research:
Michael H
Expert Research:
Jameson C
Installed by:
Cole B
Written by:
Alexander C
Photos by:
Stacy F

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