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Single-Axle Trailer Hanger Kit for Double-Eye Springs - 3-1/4" Front, 1-1/4" Rear

Single-Axle Trailer Hanger Kit for Double-Eye Springs - 3-1/4" Front, 1-1/4" Rear

Item # APS4
Our Price: $25.78
You Save: 45%
Trailer Leaf Spring Suspension
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Shipping Weight: 8 lbs
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Kit includes 3-1/4" tall front hangers, 1-1/4" tall rear hangers, 3-1/8" shackle straps and hardware for mounting springs to your 2,000-lb to 7,000-lb, single-axle trailer frame. Components for mounting axle to springs sold separately. Great Prices for the best trailer leaf spring suspension from etrailer. Single-Axle Trailer Hanger Kit for Double-Eye Springs - 3-1/4" Front, 1-1/4" Rear part number APS4 can be ordered online at or call 1-833-496-1390 for expert service.
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  • Reviews (144)
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etrailer Trailer Leaf Spring Suspension - APS4

  • Boat Trailer
  • Camper
  • Car Hauler
  • Snow Trailer
  • Utility Trailer
  • Hangers
  • Suspension Kits
  • Double Eye Springs
  • Single Axle
  • etrailer

Kit includes 3-1/4" tall front hangers, 1-1/4" tall rear hangers, 3-1/8" shackle straps and hardware for mounting springs to your 2,000-lb to 7,000-lb, single-axle trailer frame. Components for mounting axle to springs sold separately.


  • Attaches 2 leaf springs (sold separately) to your trailer frame
    • Use table below to determine hanger location based on type of leaf springs
  • Achieves 5" or 5-1/2" clearance between trailer frame and axle, depending on axle size
  • Includes:
    • (2) 3-1/4" Tall front hangers
    • (2) 1-1/4" Tall rear hangers
    • (4) 3-1/8" Long shackle straps
    • (6) 3" Long x 9/16" diameter shackle bolts
    • (6) 9/16" Diameter locknuts
  • Designed for use on trailers with single, 2,000-lb to 7,000-lb axles
  • Does not include components for mounting axle to springs

Hanger Locations for Single Axle

Leaf SpringsA - Distance Between HangersB - Distance Between Center of Axle and Trailer FrameAxle Diameter
SP-169275 (1020)20"5-1/2"1-3/4"
(typical 2,000-lb trailer axle)
SP-219275 (PR722)
SP-220275 (PR3)
SP-218275 (PR4)
SP-212275 (PR4B)
SP-111275 (PR5)
SP-198275 (PR6)
(typical 3,500-lb trailer axle)

Note: The above table provides an indication of where the included hangers can be mounted on your trailer. The distance between the hangers may vary depending on your specific application. Be sure to verify proper positioning before welding.

TSW-S7 Single Axle Hanger Kit - 1.75" Double Eye Springs - 2,000 lbs to 7,000 lbs

Replaces APS4

Customer Satisfaction Score:

Customer Reviews

Single-Axle Trailer Hanger Kit for Double-Eye Springs - 3-1/4" Front, 1-1/4" Rear - APS4

Average Customer Rating:  4.8 out of 5 stars   (144 Customer Reviews)

Kit includes 3-1/4" tall front hangers, 1-1/4" tall rear hangers, 3-1/8" shackle straps and hardware for mounting springs to your 2,000-lb to 7,000-lb, single-axle trailer frame. Components for mounting axle to springs sold separately.


The fit and finish were very good. Unfortunately, for me I had to order additional hanger brackets for the springs that were suggested for me as the kit only came with two compatible brackets. It has delayed my project for a few days until I get the new brackets.


Kit is excellent. I would recommend this kit and to my friends


Parts were exactly as described and worked well with my existing trailer brackets.


Great people, fast service, arrived complete with exact parts i needed.
Great followup emails

All the parts have held up fine with no signs of wear. I do occasionally gross out the trailer weight wise, your replacement parts have held up better than OEM parts.
Brad - 05/24/2022


I have ordered before and so has my son.Parts are complete and fit.


I inherited an aluminum trailer that ended up needing a complete overhaul and etrailer was the best resource I could have found. After researching extensively to find out what I needed and watching their videos on how to do it I ended up ordering an EZ-lube axle, galvanized hubs, springs and a hanger kit (in other words everything from the frame down).
Everything shipped quickly and arrived in great shape. All the parts worked perfectly and I couldn't be happier!


Everything was of good quality and fit together without difficulty.


As described, fast delivery, no modifications required. Assembled and positioned and welded them up.


Bought for a trailer project. Came quick. Price was great. Thanks etrailer.


Wrong parts, and when I tried to return them (because I found the correct parts at another company), they charged me with a higher cost of S&H and restocking fee that was almost more than the product was worth.


Recieved on time but unfortunately could not use on my trailer setup. Tried returning but it's over the return date and I have no use for them. Otherwise seems to be a good product


Nice product, did the job.


Everything works and fits as required. Shackles were a little rough around the edges from the stamping process so I cleaned them up a little with my side grinder and a flapper wheel, didn't need to, I just like stuff perfect. Overall very good and very useable especially for the money.


Product arrived just as described and very quickly. This kit was a great way to drop the springs on our trailer enough for the axle to be put on correctly.


It fits fine. There was no problem mou nting.


the parts worked perfectly


Welded on great. trailer tracks like ne w.

After a year they work as they should.
Dominic R - 10/05/2021


The axle hanger kit arrived today. I have done a dry setup; everything fits as expected.

Thanks for your excellent product and prompt delivery.



my order arrived well packaged.
the parts
are every bit as good as OEM and went together nicely.


As advertised. Fast shipping.


Everything needed to repair the spring hangers


Well constructed


The hangers look good and I believe they will do a great job. I need to move my axle back on my trailer so it will be able to haul some weight. It is a dump style body and can't handle weight, only on the front of the trailer. So I am going to move the axle back about 6 to 8 inches. The tracking info on the kit was great... ALL gratitude goes to your company...

It works great. Thanks for making a wonderful product. I give you 5 stars.
Elbert - 04/14/2019


I bought springs, mounts and Tailight kit to fix up a rusty utility trailer. I cut, weld scraped and painted for the better part of a month in spare time. The springs and mounting instructions on e trailer are excellent. Only issue/shortcoming are the tail lights. Wire just pushes in and spring loaded strip holds them. I soldered and sealed the connection with silicone. So far that salt covered roads haven't hurt it in winter. The folks at etrailer are very helpful and prices are a good value.


Haven't installed it yet, but the components appear to be good quality. A little surprised that there are no actual spring bushings?? Maybe that's normal for trailer springs? Looks like a thin wrap of Teflon? or something. Anyway fast shipping and good packaging.

The hanger kit does not include bushings because the trailer spring normally comes with bushings. If you are concerned about where the shackle strap bolts to the shorter hanger, I recommend it is well lubricated with grease such as L11380.
-- Etrailer Expert Heather A - 11/19/2020

Show More Reviews

See what our Experts say about this etrailer Trailer Leaf Spring Suspension

  • What Torque Should My Suspension Components Be Tightened To?
    If you're referring to the bolts that attach the shackles in your suspension system to your # APS4 hangers, you won't need to torque them to a specific rating since over tightening those bolts would squeeze the shackles against the leaf springs and potentially cause binding issues. When it comes to mounting the hangers, it is strongly recommended that you weld your leaf spring hangers to your trailer frame. Mounting the hangers with a bolt only will not provide a secure connection between...
    view full answer...
  • Are the Threads of the Shackle Bolts of the Single-Axle Trailer Hanger Kit Fine or Coarse
    The threads of the shackle bolts included with the Single-Axle Trailer Hanger Kit # APS4 are fine and they include the correct matching locknuts.
    view full answer...
  • Hanger Placement with 3,500 lb Axle with Hanger Kit part # APS4 On Trailer with Axles Under Springs
    Your axles being under the leaf springs will not change the hanger location recommendations listed for the Single Axle Hanger Kit part # APS4. You would want to have the hangers 25-3/4 apart measured on bolt center. However, since your axles are below the springs you would not need to have 5 inches between the center of the axle and the trailer frame.
    view full answer...
  • How to Mount Redline Single-Axle Trailer Hanger Kit Part # APS4 To Trailer Frame
    I contacted our representative at Redline and he informed me that the Single-Axle Trailer Hanger Kit for Double-Eye Springs - 3-1/4 Front, 1-1/2 Rear, part # APS4, must be welded to the trailer frame. He informed me that there should be a hole to make a Button Weld. I would recommend having a trailer professional install part # APS4.
    view full answer...
  • Could the Single-Axle Trailer Hanger Kit # APS4 Be Used for Mobile Home Leaf Springs
    If the springs you have are 1-3/4 inches wide the hanger kit part # APS4 that you referenced will technically fit and work with what you have. Since you are using axles we aren't familiar with I can't give you hanger spacing dimensions.
    view full answer...
  • How Far Apart Should Hangers be Mounted for 27 Inch Leaf Springs
    If your Double-Eye Leaf Springs are 27 inches long, you will just want to mount the hangers in the Redline Single-Axle Trailer Hanger Kit # APS4 mentioned in your question about 26-1/2 inches apart. As a general rule, you want the distance between hangers on a leaf spring suspension system to be around a 1/2 inch shorter than the distance of your leaf springs, which will allow for some movement with the shackle strap.
    view full answer...
  • Shackle Strap Length For Single-Axle Trailer Hanger Kit APS4
    From center hole to center hole, the shackle straps measure 3-1/8 inches on the hanger kit you asked about: - Single-Axle Trailer Hanger Kit for Double-Eye Springs # APS4 The kit also uses 3-1/4 inch tall front hangers, 1-1/4 tall rear hangers, and is designed for single axles with weight ratings between 2,000 lbs and 7,000 lbs.
    view full answer...
  • Thickness of Hangers in the Single-Axle Trailer Hanger Kit for Double-Eye Springs
    The Single-Axle Trailer Hanger Kit for Double-Eye Springs part # APS4 uses 3/16" thick hangers.
    view full answer...
  • Will Spline Length of Bolts from Single Axle Hanger Kit APS4 Prevent Leaf Spring Movement
    The spline length of the bolt that come with the Single-Axle Trailer Hanger Kit for Double-Eye Springs # APS4 aren't long enough that they would prevent the movement of a leaf spring with it. Basically holds the bolt to the shackle or hanger but does not go through enough to the spring to prevent it from moving.
    view full answer...
  • Can I Use a 2" Hanger for a 1-3/4" Wide Leaf Spring
    You want to make sure the hangers on your trailer have the same width as your leaf spring so if your leaf spring is 1-3/4" wide then you don't want to use a 2" or 2-1/2" wide hanger. It's true that you want the hanger bolts installed somewhat loosely so you leaf spring isn't binding, but you definitely don't want that much side to side play for your leaf springs inside your hangers. You either need to use wider leaf springs or you need to use smaller hangers like what you see with the...
    view full answer...
    Image 1 for Image 2 for
  • Do the Shackle Straps Go Inside or Outside the Leaf Spring Hanger
    The shackle straps need to be placed on the outside of the rear leaf spring hangers which you can see in the attached photo. Furthermore, the distance between the two mounting plates (inside to inside) on your leaf spring hangers should be 1-7/8", not 2" which is most likely why there is too much of a gap between the shackle straps and leaf spring. Therefore, the leaf spring hangers will need to be replaced. For this, we generally kit the single axle trailer suspension hangers and shackle...
    view full answer...
    Image 1 for
  • Where to Place Axle on a Custom Built Pontoon Boat Trailer
    When it comes to placing an axle on a trailer there is no set place for it to go, however the help article I have attached can really help you out in determining where the best place is on your trailer. A good starting point is having 60% of the trailer in front of the axle and 40% behind (include the tongue with this starting point) but because most of the weight of your boat will be at the rear due to the motor, you will most likely want to move it further back on the trailer in order...
    view full answer...
  • Recommended Double Eye Leaf Springs and Hanger Kit for 3,500 Pound Axle Trailer
    For double eye leaf springs, I recommend going with the 4-Leaf Double-Eye Spring # SP210275. This spring is 25-1/8 inches long x 1-3/4 inches wide and designed for 3,500 pound axles. These springs are a common length for 3,500 pound trailers. One spring is included with the part number, so you will want to order 2 of the same spring in order to replace both sides. A suspension kit will provide you with new hangers, shackle bolts, shackle straps, and locknuts needed for your new leaf springs....
    view full answer...
  • Can a Coleman Fleetwood Pop Up be Converted From Slipper Spring to Double Eye
    If you wanted to convert your slipper spring suspension to double-eye suspension you certainly could. 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 the product page the correct...
    view full answer...
  • Recommended Shackle Straps or Hanger Kit for Single Axle Trailer
    We have some kits like the Single-Axle Trailer Hanger Kit for Double-Eye Springs - 1-1/2" Front, 7/8" Rear # APS1 and the Single-Axle Trailer Hanger Kit for Double-Eye Springs - 3-1/4" Front, 1-1/4" Rear # APS4. You are correct that that bolting to your hangers on both ends is not correct, however the size of the shackle strap needed is determined based on your hanger length as you can see in these kits. So, the Shackle Strap - 3-1/8" Long # TRSL313 may or may not be a good fit based...
    view full answer...
    Image 1 for
  • Hanger Spacing Needed for Single Axle Trailer with 25-1/4 inch Long Leaf Springs
    With a 25-1/4 inch leaf spring using a single axle hanger kit like the part # APS4 the correct hanger spacing would be 24-7/8 inches.
    view full answer...
  • Can Over Under Kit Fit 2 inch Square Axle on Trailer
    We have 2 inch square U-bolt kits like part # CE23103 which you could use, but we don't have spring seats for this axle size. So you would have to remove the spring seats on your axle and weld them on the other side and you'd be have an over-under kit that fits your axle. You might have to drill spring seats in the axle.
    view full answer...
  • Leaf Springs and Hanger Kit for Single Axle Trailer with 2-3/8 OD Axle
    The correct hanger kit to fit the # SP-219275 Leaf Springs that will give you the appropriate clearance is the Single-Axle Trailer Hanger Kit for Double-Eye Springs - 3-1/4" Front, 1-1/4" Rear # APS4 . This will provide 3-11/16" clearance taking into account the axle diameter and spring pad you mentioned.
    view full answer...
  • How Far Apart Should the Leaf Spring Hangers Be Spaced With a 26 Inch Long Leaf Spring
    When using the 4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles part # SP-051275 with the Single-Axle Trailer Hanger Kit for Double-Eye Springs part # APS4 you will need to space the leaf spring hangers 25-3/4" apart.
    view full answer...
  • How To Convert Slipper Springs to Double Eye Springs on a 2007 Carnai TFS Trailer
    The leaf spring hangers you have on 2007 Carnai TFS Trailer are for slipper springs and I am not aware of a way to convert them to double eye leaf springs. In order to install double eye leaf springs on your trailer you would need to remove the hangers you have now and install the Single-Axle Trailer Hanger Kit for Double-Eye Springs part # APS4. Once the new hangers are installed you could then add the 3-Leaf Double-Eye Spring for 2,000-lb Trailer Axles part # SP-169275 (2) to complete...
    view full answer...
    Image 1 for
  • Where To Place the Leaf Spring Hangers On a Single Axle Trailer
    The placement of your leaf spring hangers will be dependant on the location of your trailer axle (see photo). Therefore, I cannot give you an exact location on the trailer frame that they will need to be installed. However, I can tell you how far apart they must be installed but only if you use a kit we offer, the Single-Axle Trailer Hanger Kit part # APS4 with the Double-Eye Spring part # SP-220275. If you use these two parts then the leaf spring hangers will need to be 24-7/8" apart....
    view full answer...
    Image 1 for
  • Typical Trailer Suspension Hanger Spacing Relative to Leaf Spring Size
    On single axle trailers typically you put the hanger spacing right at 1/4 of an inch shorter than the leaf spring length from eye to eye center. So if you were using the leaf spring part # SP-212275 that you referenced which measures 25-1/8 inches long from eye to eye unloaded the hanger spacing you'd want to use would be 24-7/8 inches. The hanger kit for this leaf spring typically is the part # APS4.
    view full answer...
  • Switching From Slipper Springs to Double-Eye Springs on 4 x 6 Trailer
    To replace your slipper springs with double-eye leaf springs you first want to take a quick measurement of the existing leaf spring stack. Measure from the center of the eye to the end of the spring to make sure the new double-eye assembly has a similar length. Also be sure that the new springs have the capacity needed to support the loaded weight of your trailer. The Universal Group 3-Leaf Double-Eye Spring # SP-169275 that you were looking at measures 20-3/8 inches from eye to eye, 1-3/4...
    view full answer...
  • Rear Hangers in Trailer Suspension Kit # APS4 Do Not have Bushings
    The trailer suspension hanger kit # APS4 does include hangers that do not have bushings like you said. Adding bushing definitely would not hurt if they will fit. The bolts are 9/16 inch which is what the holes in the hangers accept. There likely isn't space for a bushing. The other issue is that there are no bushing we carry that have a 9/16 inch outer diameter (which would then require a smaller bolt). You will want to make sure the hangers without the bushings are well lubricated using...
    view full answer...

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