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  1. Trailer Leaf Spring Suspension
  2. Universal Group
  3. Camper
  4. Car Hauler
  5. Utility Trailer
  6. Leaf Springs
2-Leaf Slipper Spring w/ Radius End for 1,000-lb Trailer Axles - 24-5/8" Long

2-Leaf Slipper Spring w/ Radius End for 1,000-lb Trailer Axles - 24-5/8" Long

Item # SP-177275
Our Price: $21.05
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Trailer Leaf Spring Suspension
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Shipping Weight: 5 lbs
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Slipper leaf spring acts as part of a trailer's suspension system by providing an attachment point for a 1,000-lb axle. Spring flexes to resist shock and also ensures a smooth ride. Includes bushing with 9/16" inner diameter. Great Prices for the best trailer leaf spring suspension from Universal Group. 2-Leaf Slipper Spring w/ Radius End for 1,000-lb Trailer Axles - 24-5/8" Long part number SP-177275 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-177275

  • Camper
  • Car Hauler
  • Utility Trailer
  • Leaf Springs
  • Slipper Springs - 1-3/4 Inch
  • 24-5/8 Inch Long
  • 1000 lbs
  • Universal Group

Slipper leaf spring acts as part of a trailer's suspension system by providing an attachment point for a 1,000-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: 500 lbs
  • Axle capacity: 1,000 lbs
  • Length from center of spring eye to end of spring (unloaded): 24-5/8"
  • Spring width: 1-3/4"
  • Eye diameter with bushing: 9/16"
    • Eye diameter without bushing: 11/16"
  • Leaf thickness: 1/4"
  • Number of leaves: 2
  • Additional dimensions: see table

Radius 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 flat 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-177 Universal Group Slipper Trailer Leaf Spring - 2 Leaf - 500-lb Capacity

Replaces WIC2

Customer Satisfaction Score:

Customer Reviews

2-Leaf Slipper Spring w/ Radius End for 1,000-lb Trailer Axles - 24-5/8" Long - SP-177275

Average Customer Rating:  4.9 out of 5 stars   (165 Customer Reviews)

Slipper leaf spring acts as part of a trailer's suspension system by providing an attachment point for a 1,000-lb axle. Spring flexes to resist shock and also ensures a smooth ride. Includes bushing with 9/16" inner diameter.


Great Company Easy to order helpful. Installation was quick and easy


Works on my 14’ Jon boat trailer. Wish I would’ve went with a little stiffer/ stronger springs but these work great too!


The Slipper spring on a Calkins Trailer (23 yrs old) disintegrated and It took a while to find the replacement because Calkins in now defunct. The E trailer parts arrived in a few days . Everything went well except that the U bolt treads were too short so I had to jury-rig the second plate underneath so that the clamps tightened round the Axle and it is working fine. The first photos show Pre and Post the third photo shows that the axle itself is also corroded and though still strong, I reinforced it with Carbon fiber.


Product arrived exactly as described, was about a week late (due to circumstances that were out of etrailer's control) I checked with etrailer and they responded quickly and kept me updated on the shipment of my order the rest of the way. I appreciate the great customer service and will be shopping with them again!


Fit fine fast shipping
I’ll be back
to this company if I rebuild another trailer




It was just as advertised at a good price. It replaced a broken spring.


Perfect for my bbq pits. On my 3rd one and my 3rd pair of springs.


Great products and price


Super service, fast shipping, arrived in excellent condition - good packaging. Matched the listing. Have not yet tried them.


They have everything you need for a boat trailer. Product comes in one or two days. Packaging is great. I recommend this Company to anyone that needs parts for their trailer.

Martin - 03/05/2021


I'm building a light duty trailer for hauling a inflatable boat (100lbs) and outboard (100lbs). These light duty springs will be just about perfect for what I need. It was hard to find light duty trailer springs, seems like most online sites they all started at 2000LBs''


Ordered new leaf springs for my trailer. Great website to locate what I needed. Order filled and on its way in less than 24 hrs. Delivery was ahead of schedule and product was just as advertised. Great customer service with an email at each step informing me of progress of my order. Great site and great company.

I’ve put a lot of miles on my trailer since replacing the springs. Not a single problem and the ones I got are better than the factory supplies ones that came with the trailer. Still very happy with my purchase!
Ray - 08/09/2020


Got here quickly. Install was easy. It did make the wheels a few inches back but I resolved the issue. It was for a folding trailer.


These are a perfect fit for my old PWC trailer. They were easy to install and we’re delivered earlier than expected. eTrailer customer service is the best. I’ll never buy trailer parts from any other online retailer.

Have had these on the PWC trailer for about a year now. The springs are still firm and have shown no signs of rusting. The trailer is towing better too. Dollar for dollar this was the best upgrade Ive made to the trailer. Not at all disappointed at all by this purchase!
Wayne - 06/27/2020


works fine . I put these springs on a trailer I built to tow my motorcycle behind the car. The bike weighs 750lbs and the springs are rated at 1,000 per . with 14in tires it tows very well . great price and fast delivery... thanks


This was a hard to find spring from a HARBOR FREIGHT Chinese Trailer. IT WAS A LITTLE LONG BUT SHOULD WORK FINE. Was shipped fast and at a better rate than quoted. these guys are good. thanks for the service, Dale

works great they saved my trailer
Dale - 10/20/2020


Excellent product. The U-bolts fit the slipper springs nicely and were easy to install. I ended up not using the mounting plates as the plates welded to the existing axle matched the U-bolts.


Spring does what you'd expect. The only downside is that etrailer took a week just to ship the item then another 3-4 days before it was delivered. This project was on hold for almost two weeks because of the delay.


They are EXCELLENT!!! Timely delivery and the products are top notch and affordable. I recommend etrailer to everyone!!


Excellent spring for any properly rated trailer. I used the spring on my trailer for an inflatable boat. Worked perfectly and fix exactly. Also bought new u-bolts and plates.


Very nice springs for a light duty trailer. The bushing could be a little better, but honestly for the price I won't complain much.


Repairing a small boat trailer and needed new springs and tires. I found these here and at good prices. Hopefully I won't have to do any more work on the trailer but if I do I will be looking here for parts.


Replaced the leafs on my mini trailer to 1k lbs springs. Rides so much better now, etrailer was a no hassle buy. Good prices, shipping and tracking. Thank you


slipper spring was exact match..only 40 minutes to install sweet!!! time i drop a tree on my trailer (dont intend to but hey) i will defitnitly order thru etrailer they have it are waycool also went on rim with no prob many thanks highly recomend both items and doin business with etrailer

Show More Reviews

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

  • How to Order The Correct Slipper Springs For A 1970s Harding Boat Trailer
    The springs you have on your boat trailer are called slipper springs. One end of the spring has an eye and the other is an arched, open end. The front eye of the spring is attached to a front hangar on the trailer and the slipper end is inserted into a rear hangar. To get the correct slipper spring for your trailer you will need to know the number of leaves, the width of the spring, the length of the spring, and the weight rating of the axle on your trailer. The 2-Leaf Slipper Spring for...
    view full answer...
  • Can Double Eye Springs be Replaced with Slipper Springs on a 1969 Shoreline Boat Trailer
    In most cases switching from double eye to slipper spring requires new hangers and mounting hardware. This would require you to cut the old spring hangers off the trailer and mount the new hangers in the correct location for the slipper springs. Due to the extra welding involved, I suggest you stay with your original suspension set-up. To select the correct springs you need the weight capacity of each axle. Then you need to measure the dimension from center of eye to center of eye on...
    view full answer...
  • Distance Between Slipper Spring Hangers When Used with Slipper Spring # SP-177275
    The distance from the center of the bolt hole on front hanger to the rear hanger for the slipper spring # SP-177275 would need to be 23-1/8 inches. I attached an FAQ article on slipper spring suspension systems for you to check out as well.
    view full answer...
  • Is there a Centering Stud on Both Sides of the Redline Slipper Spring # WIC2
    I pulled a 2-Leaf Slipper Spring # SP-177275 from our warehouse and found that it has a mounting stud on both sides of the slipper spring. Check out the video I attached that shows both sides of the spring.
    view full answer...
  • How to Pick Out Slipper Spring for a Jon Boat Trailer
    Your trailer has pretty short slipper springs. Since we don't have any slipper springs short enough your best option is going to be to determine what spring capacity you would need and then get the correct spring for that and then move the hangers of your trailer so that it will accommodate the spring. I attached a page that has a chart with all of the slipper springs we carry for you to check out. Having a trailer sitting lower on one side than the other has potential for tire wear as...
    view full answer...
  • Slipper Spring Recommendation for Replacing 26 inch Long Spring
    The closest slipper spring to what you are looking for is the part # SP-177275 which is 1-3/4 inches wide, 2 leaves, and an overall length of 30-1/4 inches. This spring is designed for 2,000 lb axles. If the distance between your spring hangers is 27-3/8 inches this would work well for you assuming the axle capacity is correct.
    view full answer...
  • Replacement Trailer Slipper Spring for a WaveRunner Trailer
    Trailer springs tend to stretch out around 1/2 inch from the dimension they had when new. For your waverunner trailer the part # SP-177275 should work well as it has a 1k axle rating and is 23-1/8 inches long where yours is 24. We don't have galvanized springs unfortunately, and I would recommend you keep the spring over/under the axle in the same configuration as you have it now.
    view full answer...
  • Can a Trailer with Slipper Spring Suspension be Converted to Double-Eye
    Sounds like your trailer has slipper springs and you are wanting to convert it to a double-eye system. This is definitely possible. It would be just a matter of changing springs and hangers. You would need to go with a leaf spring that is rated for the weight of your trailer when it is loaded an ready to go. I attached a page that has all of the double eye springs we offer. At the top is a chart that has all of the springs and their capacities. Select the capacity you need and then on...
    view full answer...
  • 1000 lb Capacity Slipper Springs For 400 lb Sailboat Trailer To Ease Rigid Ride
    The 2-Leaf Slipper Spring w/ Radius End for 1,000-lb Trailer Axles - 24-5/8" Long, # SP-177275 will most likely work well on your trailer and will ease the beating on your 400 lb sailboat. The 3/8 inch difference in length from your current springs shouldn't be an issue based on the curve, so I don't forsee an issue. However, if you find out it does bind and cause issues, you would need to move the mount. Since you will be lowering the capacity of your trailer, make sure your boat...
    view full answer...
  • Recommended Leaf Spring Capacity for a Conversion Boat Trailer
    Yes and no, a leaf spring with a lower capacity will provide a better quality ride than a leaf spring with a higher capacity but you will not want to make that part the lowest rated suspension component. Typically, we recommend choosing a leaf spring with a capacity that either meets or exceeds the capacity of the axle. I would be skeptical if the leaf spring pack you have now is only rated at 1,000 lbs. However, since you have converted a boat trailer to a light duty kayak carrier I...
    view full answer...
  • Replacing Leaf Springs On Trailer To A Lower Capacity To Avoid Road Shock
    Yes you can replace the leaf springs that came standard on the trailer to soften the ride of the trailer. Just be advised that the total capacity of the trailer will be lowered because you will be limited by the lower rated springs. You can refer to the linked articles for help in selecting appropriate springs for your trailer. Do note that very well-worn springs can become elongated from years of use. If you remove a spring from the trailer and measure it you may find that it has become...
    view full answer...
  • Finding VIN on Trailer to Register and Purchase Tag
    A Vehicle Identification Number (VIN) can be found in many different locations on a trailer. It is most common to be found near the coupler on a plaque or embossed into the frame. It however can be anywhere on the trailer frame as there are not consistent rules for this. If you cannot find the VIN anywhere on your trailer frame, you can call your local highway patrol and they can issue one to you so you can register your trailer.
    view full answer...
  • Trailer Leaf Slipper Spring With Smallest Capacity
    I am not 100% sure what you are asking for or the parameters you have in mind other than the weight so the best I can offer is the lightest available leaf spring, which has a 500 lb capacity. - 2-Leaf Slipper Spring # SP-177275 This is a 1-3/4" wide slipper spring that measures 24-5/8" long; if you let me know the size you need I may be able to offer a recommendation. Additionally, I have added a link to a video review for you to check out as well as a couple links to help articles on...
    view full answer...
  • Replacement Hook Style Leaf Spring for Trailer
    Thanks for the photo. The hook end you referenced is a slipper style leaf spring but without knowing the capacity of your axle or the width of the spring is it difficult to give you a replacement recommendation. I've attached the link for the page to all your leaf spring options to assist. The number of leaves doesn't matter but the length, width, and capacity does.
    view full answer...
    Image 1 for
  • Can You Remove a Leaf On the 2-Leaf 1K Slipper Spring with Radius End
    The 2-Leaf Slipper Spring w/ Radius End part # SP-177275 cannot be disassembled. It has a 500 lb capacity which will be the lowest we can offer. It should still work fine for a 400 ish lb trailer.
    view full answer...
  • 1975 Dilly Boat Trailer Leaf Springs Replacement Solution
    The closest leaf spring we have is the Slipper part # SP-177275 which is 30 inches overall and is rated for an 1,000 lb axle. This spring could work for you but you'd have to move in your hangers a bit closer most likely.
    view full answer...
  • Availability Of 1000lb Slipper Spring For A 1000lb Motorcycle Trailer
    The shortest 1000lb rated spring we offer is the 2-Leaf Slipper Spring w/ Radius End for 1,000-lb Trailer Axles - 24-5/8" Long # SP-177275 which measures 24-5/8" from the center of the spring eye to the end of the spring as shown in the included diagram. This is a 1-3/4" wide slipper spring so I recommend double checking the spring on your trailer is also 1-3/4" wide, and confirm that you are measuring the length as shown in the included diagram with the trailer off the ground as weight...
    view full answer...
    Image 1 for
  • Can Trailer Leaf Spring SP-177275 be Used in Place of 1,500 lb Axle Leaf Spring
    Yes, the 2-Leaf Slipper Spring part # SP-177275 will work great in place of a similar setup designed for a 1,500 lb axle. This is for a 1,000 lb axle so it will be a bit softer. It's also the same size as what you have so it will easily bolt up in place.
    view full answer...
  • Replacement for 26.25 Slipper Leaf Spring for 700 lb Trailer
    For a 26-1/4 inch long slipper spring that is 1-3/4 inches wide we have a spring that is going to be way overkill with capacity as the part # SP-264275. This has a 4,300 lb capacity. The best option would be the part # SP-177275 with you moving your current hangers most likely as it is 24-5/8 inches long overall and 22-11/16 inches long where it mounts to hangers.
    view full answer...
  • Slipper Spring Recommendation for a Kayak Trailer
    All things being equal there really isnt an advantage to going with one over the other, its just that when you get to the heavier capacities you only see the slipper style. I would recommend either for you, but more importantly you want to pick the spring set that best matches the capacity of what you plan on towing. In that case I would recommend the 2-Leaf Slipper Spring for 1,000-lb Trailer Axles # SP-177275 since it has the closest capacity at 1,000 lbs per axle. Since your trailer...
    view full answer...
  • Replacement Slipper Spring for a Jon Boat Trailer
    When replacing trailer leaf springs you are correct in that you want to do both sides at the same time. You can go a little over in capacity but if you go too much the suspension basically wouldn't function as it would be too stiff to move and absorb bumps. When picking out a slipper spring the most important dimension you need to get from your old springs is the length of the spring when measured from the center of the bolt hole to the other end of the spring. The 2-Leaf Slipper Spring...
    view full answer...
  • 1,500 lb Slipper Springs or 1,000 lb Slipper Springs for a Trailer
    The best way to pick out a slipper spring replacement for a trailer is to base it off of the weight capacity for the trailer and then the dimension of the spring getting replaced. Sounds like you are considering going with the # SP-178275 over the # SP-177275 for your trailer. Both of these springs share the same dimensions, but since your old springs seem to be too soft it would seem like the # SP-178275 would be a better choice. You should note that going with a higher rated spring...
    view full answer...
  • How to Choose Correct Replacement Slipper Spring for 1981 Daily Boat Trailer
    By slider leaf spring, I'm assuming you mean a slipper spring. To recommend a suitable replacement, I'll need to know the capacity of the axle (this can be determined from the wheel bolt pattern, the diameter of the axle or from the reference numbers from the inner and outer wheel bearings. Getting an accurate measurement of the spring length is important as well, because the springs can flatten out over time. Is the measurement you took from the center of the eye to the very end of...
    view full answer...
    Image 1 for
  • Can Lower Rated Leaf Springs Be Installed on a Trailer to Improve Ride Quality
    You can use a 1,000 lb capacity leaf spring on a 3,500 lb axle without any problems. You should note that your overall capacity would be limited to the lowest rated component of the trailer. Which in your case could be the 1,000 lb leaf springs. So basically you should be able to improve the ride quality of your trailer by going to a 1,000 lb rated spring like the # SP-177275 but you would sacrifice weight capacity. Since your trailer weighs 1,200 lbs you basically wouldn't be able to...
    view full answer...

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