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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/ Flat End for 1,800-lb Trailer Axles - 30" Long

2-Leaf Slipper Spring w/ Flat End for 1,800-lb Trailer Axles - 30" Long

Item # SP-038275
Our Price: $46.35
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Trailer Leaf Spring Suspension
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Shipping Weight: 10 lbs
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Slipper leaf spring acts as part of a trailer's suspension system by providing an attachment point for a 1,800-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/ Flat End for 1,800-lb Trailer Axles - 30" Long part number SP-038275 can be ordered online at or call 1-800-940-8924 for expert service.
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Universal Group Trailer Leaf Spring Suspension - SP-038275

  • Camper
  • Car Hauler
  • Utility Trailer
  • Leaf Springs
  • Slipper Springs - 1-3/4 Inch
  • 30 Inch Long
  • 1800 lbs
  • Universal Group

Slipper leaf spring acts as part of a trailer's suspension system by providing an attachment point for a 1,800-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: 900 lbs
  • Axle capacity: 1,800 lbs
  • Length from center of spring eye to end of spring (unloaded): 30"
  • Spring width: 1-3/4"
  • Eye diameter with bushing: 9/16"
    • Eye diameter without bushing: 7/8"
  • Leaf thickness: 3/8"
  • Number of leaves: 2
  • Additional dimensions: see table

Flat End Slipper Spring

Part NumberABCDE

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-038 Universal Group Slipper Trailer Leaf Spring - 2 Leaf - 900-lb Capacity

Replaces WID2

Customer Satisfaction Score:

Customer Reviews

2-Leaf Slipper Spring w/ Flat End for 1,800-lb Trailer Axles - 30" Long - SP-038275

Average Customer Rating:  4.8 out of 5 stars   (118 Customer Reviews)

Slipper leaf spring acts as part of a trailer's suspension system by providing an attachment point for a 1,800-lb axle. Spring flexes to resist shock and also ensures a smooth ride. Includes bushing with 9/16" inner diameter.


My old leaf springs were so rusted I was one pot hole away from being broken down. These are perfect!


Prices were better than my local stores and anyone else on the internet and I received them in 3 days! I’ll definitely buy again for trailer needs.


Fantastic all around. Service, Product, Communication!


Great Product, Fast shipping, Great experience!! Thanks


These leaf springs are amazing! I purchased two springs that replaced the old leaf slipper springs on a single axle toy hauler trailer. The measurement from the eye bolt to the end of the slipper spring was 29 1/4 inches. My old springs measured 32 inches because they were so worn and the 30” leaf slipper springs worked perfect!


Service was great, had to wait a bit due to supply chain issues outside etrailer's control.
One thing to note, order in pairs! I mistakenly ordered a single spring, Janet was able to help me get the second one quickly.
Looking forward to tuning up an old utility trailer with these.
One minor suggestion for etrailer: Question anyone ordering ONE spring! :)


The springs fit perfectly and fully met my expectations...see attached photo of my trailer with new parts installed. Great quality, price, lightning fast delivery, and exceptional customer service from order to drop off at my doorstep. Will recommend and order again. Well done, e-trailer, and Thanks.


Couldn’t find locally, had them in 3 da ys.


Great deal! Shipped fast and fit great on an old Dilly trailer for my Hobie Cat. The right side spring was flattened, so replaced em both and the fit was great. Thanks eTrailer!


Was able to raise my 38yr old trailer to like new height. Website was easy to navigate to find parts.


I like that. all dimensions right exactly with product description. Looks very strong.
Good quality. I hove it will give my jetski nice and smooth road trips.


I ordered the springs on Saturday and got them UPS ground Thursday, amazing service, website and product springs fit like a glove many Thanks!


Excellent quality and exact size springs are holding up great. Plus shipping for parts was fast thanks again


It still is working !!


The left leaf spring on my Dilly 3 rail motorcycle trailer broke. These springs cannot be welded because the steel carbonizes. I ordered 2 replacemeny slipper leaf springs from etrailer. They fit beautfully, just had to slightly increase the diameter of the hole in the axle so that the bolt/nut in the center of the spring would fit. Etrailer has always delived a quality product over the years to me.


good job i wish i bought all of my suspension parts from you


Work fine. Had to open the holes on the trailer for 9/16dia. mounting bolts. The trailer is from the 70's, and the 1/2 mounting holes were already wore larger so a 9/16 drill worked easily.


Fast shipping, excellent quality and ease of ordering make etrailer the place to shop for all your trailer needs. I haven't installed all the items but will do so when the weather turns favorable. All items are exactly as ordered and should present no problems installing them. My only suggestion would be to secure the slipper springs more securely within the large box. In transit movement which must have caused the springs to move, allowed them to mash the smaller box and spilled out some of the smaller items which, luckily, were not lost. I will shop with etrailer again in the future.


This is a good, light duty spring. I replaced a set that were about 30 years old and these springs were exactly the right size. While the original spring was 4 leaves, this one was only two, but much thicker steel. Over all, I think the trailer ride is better than the old spring, but I miss the nylon bushings that were used before. This spring has a steel sleeve for the shackle bolt.


Just what I needed to fix my snowmobile trailer. Replaced old 4 leaf springs with this one. Everything perfect. From order to delivery I got great communication from etrailer. When shipped, faster ship no extra charge, these guys go above and beyond! Any trailer needs in the future will be bought here. These guys rock!!!!


Needed to replace a broken spring on my ATV trailer. Ordered 2 new springs, as everyone says that you should replace both sides at the same time. Only took a little over an hour to remove both sides and put on new springs. Got to love air tools. PS do not forget to replace your U bolts as well.


Installed the springs tonight, have to install the axle with new u-bolt kit yet. The spring pins had threaded grease zerks! Way to go! :-) So far, so good.


Springs fit great and installation was easy. Really happy.


Perfect! Fixed up my 35 year old trailer's suspension like new.

All products performed perfectly. Very happy with my purchases. Thanks again.
John B - 06/28/2018


Needed boat trailer springs and nobody around carried them in 30". Did a search and found had them. Super fast shipping (ordered them on Wednesday and they arrived Friday) ! Perfect fit and got our boat back on the trailer and to the water the next day. I highly recommend

Show More Reviews

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

  • How to Measure for Replacement Slipper Spring on a Cox Tent Trailer
    A similar leaf spring that we have is the Universal Group 2-Leaf Slipper Spring # SP-038275 which is 30" long and rated for a 1,800 lb axle. The 30" is measured from the center of the eye to the end of the leaf spring (see attached picture). The spring is 1-3/4" wide and has an eye diameter of 9/16" with the bushing. Let me know if this doesn't fit your specs and I can see if we have something else for you.
    view full answer...
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  • Where is 30 Inch Measurement Taken on Slipper Spring # SP-038275
    2-Leaf Slipper Spring # SP-038275 measures 30 inches from the center of the eye to the very end of the spring. I included a picture showing some measurements for this spring: A is 13-3/4 inches B is 30 inches C is 15 inches D is 17-3/4 inches E us 4-7/8 inches It depends on the design of the slipper spring by a 27 inch double eye spring would connect to the hangers at about the same locations as a 30 inch slipper springs. The two styles use different hangers though.
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  • Will Overrated Slipper Springs Cause Rigid Ride
    The 30" 2-Leaf Slipper Spring for 1,800-lb Trailer Axles # SP-038275 may well improve your ride, it just depends on what your axle is rated for and what your current springs are rated for, though it seems likely a 4-leaf spring is rated for more than you need. Ideally you are going to want your springs to be rated the same as your axle, or as close as possible without going under. The 30" # SP-038275 you referenced have an 1,800 lb axle capacity (900 lbs per spring), which is the lightest...
    view full answer...
  • How To Find the Correct Replacement Leaf Spring for an Old Row Boat Trailer
    In order to find out what trailer leaf spring is correct you will need to measure from the center of the eye to the end of the other side while there is no weight on the trailer. Since you have a slipper type spring you will also need to measure the width. I have attached a list of options for you once you get the above info but from the photo it looks like you have need the 2-Leaf Slipper Spring w/ Flat End part # SP-038275 which measures 30" long and is 1-3/4" wide. I recommend you replace...
    view full answer...
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  • Which End Faces Forward When Installing a Slipper Spring
    When installing a slipper spring, like the 2-Leaf Slipper Spring # SP-038275, you will install it so that the end with the eye is oriented towards the front of the trailer and the open end is facing the rear part of the trailer. You will need to use hangers when installing slipper springs and avoid shackle straps. Since one end of the slipper spring is open and not "fixed" it will not sit properly if shackle straps are used. I have attached a review video for this specific slipper spring...
    view full answer...
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  • Can Slipper Spring # SP-038275 Install Below Trailer Axle
    Yes the slipper spring part # SP-038275 that you referenced can install below the trailer axle. I attached a picture that shows it installed in this orientation.
    view full answer...
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  • Can the 2 Leaf Spring on my 1977 Boat Trailer be Replaced with the 3 Leaf Spring # WIF3
    Over time leaf springs will flatten making them a bit longer than their than their original length. You mentioned that the springs on your 77 boat trailer measure 31-1/2 inches so the 3-Leaf Slipper Spring, # SP-039275, measuring 30-1/4 inches would work as a replacement for your current 2 leaf springs. Part # SP-038275 that you mentioned is a 2 leaf spring for 2,000 pound axles. Please keep in mind that although you will be increasing the weight capacity of the springs by upgrading to...
    view full answer...
  • Replacement for 31 Inch Slipper Springs on Small Trailer
    The closest leaf springs we have to what you're describing is part # SP-038275. these are 30 inches from the center of the eye to the very end of the slipper end. One thing to keep in mind is your springs are going to be longer than they were when they were new because springs flatten over time. Before purchasing springs you should find out your trailer's axle capacity because the number of leaves isn't an indication of capacity. These springs are for 1,800 pound axles. Also, make sure...
    view full answer...
  • Correct Replacement for Old Worn Out 31.75" Long Trailer Slipper Spring
    The best fit replacement option we offer for this trailer using the provided measurements is the 2-Leaf Slipper Spring w/ Flat End part # SP-038275 which measures 30" long. The leaf springs will lengthen over time as they wear out which is why the correct replacement is usually shorter in length than the original. This one seems a bit shorter than normal but the keeper should still retain the end of the spring just fine based on the provided distance.
    view full answer...
  • Replacement Slipper Springs for 1982 Cox Boat Trailer
    Selecting new slipper springs for your 1982 Cox boat trailer's suspension means matching them up to your trailer's axle weight rating and also matching their width and length dimensions. The actual number of leaves does not always matter because different grades of steel can mean fewer or more leaves in a spring for it to reach is rated weight capacity. I think you are on target with the 1800-lbs axle rating for the spring # SP-038275 you referenced since your 1-1/4-inch diameter axle...
    view full answer...
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  • Recommended Leaf Springs for 1200 lb Trailer
    For your 1200 lb trailer capacity, I recommend the 2000 lb leaf springs like # SP-169275. These will have a 1000 lb capacity each. These come in different lengths, so I have attached the options for you in a link. If you have slipper springs instead of double eye springs, then the 2-Leaf Slipper Spring w/ Flat End for 1,800-lb Trailer Axles - 30" Long # SP-038275 are the only option we have that won't give you too rigid a ride on your trailer.
    view full answer...
  • Picking Out Replacement Leaf Springs for 2001 Coleman Utah Pop Up
    Looks like you have slipper springs on your 2001 Coleman Utah pop up. We have replacement slipper springs available like the # SP-038275 which is 30 inches long and for 1,800 lb axles or the # SP-179275 which is 24-5/8 inches long and for 2,000 lb axles. These are both 1-3/4 inches wide which is the most common width for lighter duty applications like yours. If you can get me the axle capacity you need, the length of the springs, and the width I can see if we'd have a direct replacement...
    view full answer...
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  • Replacement Slipper Spring Recommendation to Replace 31 inch Long Spring
    For a slipper spring that would work well for your application you would want the part # SP-038275. This is a 2k rated spring that is 30-1/4 inches long. This should be a much softer spring than what you have as it looks like your spring would be a higher capacity than this one.
    view full answer...
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  • 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...
  • Slipper Spring Recommendation for a Jon Boat Trailer
    Based on the dimensions you listed I think the part # SP-264275 would fit. It's 26-14 inches long, has 13-1/4 from the eye to the mid point of the spring and has an overall height of 3-1/2 inches. Each spring is rated at 2,050 lbs. For a lighter rated spring with very similar dimensions that would work check out part # SP-038275. It has a 1,000 lb capacity. It doesn't have the hook at then of the spring, but it would work much better. Sounds like you were already planning on doing it,...
    view full answer...
  • Are Trailer Leaf Springs Directional, Is there a Front and Back
    Double eye leaf springs like the part # SP-169275 do not have a front or back designation. Slipper springs like the part # SP-038275 do have a front and back.
    view full answer...
  • Are Radius End And Flat End Slipper Springs For A Trailer Interchangeable?
    The only difference between the Flat and Radius end slipper springs is the shape of the end of the spring with the radius having an arch and the flat being flat as you can see in the included pictures of the Radius End # SP-179275 and Flat End # SP-038275. The springs are interchangeable but you will want to make sure that the length from the center of the spring eye to the end of the spring is the same, and make sure the spring matches the axle rating of the axle on your trailer. I included...
    view full answer...
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  • Does Hitch Bolt 166097 Fit Slipper Spring part # SP-038275
    Yes the spring eye bolt part # 166079 does fit with the slipper spring part # SP-038275 that you referenced.
    view full answer...
  • 30 inch Long Slipper Spring Recommendation for Boat Trailer
    We have a few options for 30 inch long slipper spring that is 1-3/4 inches wide. For a 3,700 lb axle option we have the part # SP-040275. For a 2,900 lb axle option we have the part # SP-039275. For an 1,800 lb axle you would want the part # SP-038275.
    view full answer...
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  • Replacement Slipper Springs to Replace 32 Inch Long Springs
    The 30 inch slipper springs we carry don't have a measured radius but the 28 inches you're looking for will work just fine. Your 32 inch springs were likely a little shorter than that originally and have flattened over time. Although probably not the full 2 inch difference but enough that our 30 inch springs will work on your trailer. We carry three different weight capacities that are 30 inches: 4-Leaf for 3,700 pound axles # SP-040275 3-Leaf for 2,900 pound axles # SP-039275 2-Leaf...
    view full answer...
  • Slipper Spring for Older Boat Trailer that is 30 inches in Length
    We have a few slipper springs that are 30 inches from spring eye to hook, but you did say eye to eye which would imply a double eye spring. Since 30 inch double eye springs are very uncommon I'll assume you do have a slipper. So for a 1,800 lb capacity spring you'd want the part # SP-038275 or for a 2,900 lb spring you'd want the # SP-039275.
    view full answer...
  • Replacement Slipper Style Leaf Spring for 1984 Tee Nee Trailer
    For your 1984 Tee Nee trailer, the number of leaf springs is not the determining factor but rather the length and the capacity rating. The 3-Leaf Slipper Spring w/ Flat End for 2,900-lb Trailer Axles - 30" Long # SP-039275 is a great replacement option based on your photo as long as your axle capacity is 2900 lbs because each spring is rated for 1450 lbs. If you have a 3,500 lb axle then instead you would want # SP-040275 because it is a higher weight rated spring. If the trailer axle...
    view full answer...
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  • Replacement Slipper Springs for a 2,100 lb Trailer
    The most important factor in picking out a new leaf spring for a trailer is to match the capacity needed. Going with a 3,500 lb spring for a 2,100 lb trailer is going to give you a very harsh ride. For a spring similar to the # WIG4 that is better rated for your trailer we have the # SP-039275 which is for a 3,000 lb axle or part # SP-038275 for a 2,000 lb axle. If you need all 2,100 lbs of your trailer's capacity you would have to go with the # SP-039275. If you have a 2 inch square...
    view full answer...
  • Replacement Trailer Suspension Components
    In a typical leaf spring trailer suspension a spring seat like # TRSS300 is welded to the axle but the u-bolt plate is not. The u-bolt plates are bolted around the axle and leaf spring and these hold the spring in place on the spring seat and to the axle, as noted on your photo. You can also refer to the linked article on slipper spring suspensions for more on the details of how these parts work together and on how to measure. You'll want to completely remove one spring from the suspension...
    view full answer...
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