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  6. 4-1/4 Inch Long
U-Bolt Kit for Mounting 2,000-lb, Round Trailer Axles - 4-1/4" Long U-Bolts

U-Bolt Kit for Mounting 2,000-lb, Round Trailer Axles - 4-1/4" Long U-Bolts

Item # APUBR-10
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Trailer Leaf Spring Suspension
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Trailer Leaf Spring Suspension APUBR-10 - U-Bolt Kits - Redline
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Mount your round, 1-3/4" diameter axle to your trailer's leaf springs with this U-bolt kit. U-bolts, plates and nuts included. Lowest Prices for the best trailer leaf spring suspension from Redline. U-Bolt Kit for Mounting 2,000-lb, Round Trailer Axles - 4-1/4" Long U-Bolts part number APUBR-10 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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Redline Trailer Leaf Spring Suspension - APUBR-10

  • U-Bolt Kits
  • Axle Mounting Hardware
  • Round Axle - 1-3/4 Inch
  • 4-1/4 Inch Long
  • 2000 lbs
  • 3/8 Inch Diameter
  • Redline

Mount your round, 1-3/4" diameter axle to your trailer's leaf springs with this U-bolt kit. U-bolts, plates and nuts included.


Features:

  • Attaches trailer axle to leaf springs
  • Includes:
    • (4) 4-1/4" Long U-bolts (175643)
    • (2) U-Bolt plates for 1-3/4" springs (117535)
    • (8) 3/8"-24 Hex nuts (38N)
  • Spring seats required for mounting axle to leaf spring sold separately


Specs:

  • Axle diameter: 1-3/4"
    • Typical 2,000-lb axle
  • Spring width: 1-3/4"
  • Dimensions: see below


U-Bolt Diagram



APUBR-10 U-Bolt Kit for 2,000-lb Round Trailer Axles





Video of U-Bolt Kit for Mounting 2,000-lb, Round Trailer Axles - 4-1/4" Long U-Bolts

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




Video Transcript for Redline Round Trailer Axle U-Bolt Mounting Kit Review

Randy: Hey guys, it's Randy here at etrailer.com. Today, we're going to be taking a look at a replacement U-bolt kit. This is going to be designed for the 2000 pound axles, looking for an inch and three-quarter axle diameter. You can see how they're designed to fit around your axle with an incorporated plate here and hold that axle to your spring pack.Now, I think it's crucial anytime you replace an axle that you replace these U-bolts. Over time, of course, they're going to get stressed and they're going to get strained. They can even stretch out on you.

And basically by getting a new set, not only do we have new hardware, so we don't have to worry about any cross-threaded situations, we get new lock washers and a new plate down here, by getting these new U-bolts, you can rest assured that your axle is going to be held securely to your spring.When we just throw our old U-bolt kit back on there and we start torquing it down, there's no way for us to know for sure that it's actually holding to the values that we want. So definitely keep that in mind. I think that anytime I replace an axle, I always get a new U-bolt kit for it. Talk to our customer, explain to them the benefit and let them know that by replacing that you get that peace of mind and you know that you're not going to have any issues with it down the road. And oftentimes it's hard to get the old nuts off.

They're usually rusted onto the U-bolts and you generally have to wind up cutting them. So in my mind, if you're ordering an axle, definitely get a replacement U-bolt kit. So when you do get everything there, you're not running around trying to find it. It's a very cost-effective way to freshen everything up and get it ready to go.Now, when we install our U-bolt kit, essentially we'll take two of the U-bolts and they need to go around our axle. In our case, our axle's sitting on top of the spring so we put the spring perch right on the bolt that sticks out, because that's going to be sitting right in there, right in the middle.

Then our plate needs to go on the opposite side of that. And if we look down low, you'll see that bolt's also going to come through the center hole on that. The two outside holes, we've got our U-bolts that come down through. Then we're going to place a lock washer and we're going to place a nut on each one. Once we've got that done, we need to equally tighten these down to get them nice and snug.

Then we'll torque them to specifications. Now we'll just head over to the other side and repeat that same process there. We'll be ready to go..


Customer Reviews

U-Bolt Kit for Mounting 2,000-lb, Round Trailer Axles - 4-1/4" Long U-Bolts - APUBR-10

Average Customer Rating:  4.8 out of 5 stars   (300 Customer Reviews)

Mount your round, 1-3/4" diameter axle to your trailer's leaf springs with this U-bolt kit. U-bolts, plates and nuts included.

- APUBR-10
by:

I purchased this kit for the standard 5' x 8' 2,000 lb. trailer from Lowes. I did an axle flip and added larger tires. This is the perfect kit for this trailer. It went on easy, and the bolts were slightly longer. Also the bolts in this kit were fine thread instead of course thread. Overall an improvemet over the factory hardware and I had no issues. Shipped in a timely manner and packaged well. I highly recommend this kit if you plan on flipping the axle or need a replacement.



- APUBR-10
by:

These should include lock washers or jam nuts. There is nothing to keep them tight. I added lock washers and jam nuts for added tightness. Extremely fast shipping. Well packed.



- APUBR-10
by:

Looked under my trailer and the u bolts and plates wer rusted away, it's an old trailer so I had no details like make or model number. Called and talked to Kelly S. She was very knowledgeable and overly efficient! Got my parts super fast, the u bolts wrer very thick and the plates were even thicker. Quality parts at a good price. Would highly recommend and a big thanks to Kelly


Comments
A year later still going strong
Mike T - 02/29/2016



- APUBR-10
by:

Stacy of etrailer was fantastic. I did not know much about trailer repair parts but Stacy walked me through explaining the parts names and usage for the items I needed and when I checked other sites they did not have my products nor did they ship for free. Great experience!



- APUBR-10
by:

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!



- APUBR-10
by:

They are great, except that I should have ordered square u bolts. My mistake. :-)



- APUBR-10
by:

I am restoring my Carry On trailer and the U-Bolts were a rusty mess. E-trailer had what I needed and it is the exact product as the original, so yes, this product does fit Carry On trailers sold by Tractor Supply Company. This is a great product at a very reasonable price.



- APUBR-10
by:

Product was exactly as described and has held up well for the year I’ve owned it. Customers service, shipping, everything was on point. If I have trailer needs in the future I’ll definitely be shopping here.


Comments
Still going strong another year later!
Brandon B - 05/24/2021


- APUBR-10
by:

Christian was a great help on the phone to help me figure out what I needed. Shipment arrived very quickly. Packaging could have been better.



- APUBR-10
by:

I purchased a number of products from etrailer and I am very pleased with them all. The shipper lost my axle. When I contacted etrailer customer service, they handled my problem quickly and I had a replacement axle in a couple days. Well done! The products were all of high quality and the assemble was much easier as a result. I have attached a few pictures of the build for those interested. Thanks etrailer for your great products and service!!


Comments
The trailer has performed better than my expectations. The products I purchased are all performing perfectly. When I build my next trailer, I will get all my assemble products from etrailer.com
Jim D - 01/02/2021


- APUBR-10
by:

Did not end up using, as the previous U-Bolts were still in good shape and had nylock nuts. Be aware that these have 24 TPI threads, not the expected 16 TPI. This is published in the description on the web, I did not read all of the words that were so carefully written. etrailer did everything right on their end.


Comments
No problems with this or the other parts I used to convert to spring over configuration. I recommend etrailer and will use them next time I change my rig.
Thom K - 07/07/2015



- APUBR-10
by:

Old spring seats were rusted away, replaced the seats and u bolts, etrailer showing the measurements makes it easy to know you are getting the right parts



- APUBR-10
by:

As advertised. working properly



- APUBR-10
by:

this ujoint kit appears to be complete however the spring seat is not a kit and only comes with just the one. So you need to know to order 2. this is has cause me a delay since I had to order another. The info should be there to warn the buyer they need a quantity of two or come with two if it's sold as a kit like item APUBR-10 ---the ubolts.


Comments
As stated in the product description, the spring seats are sold separately.
-- Etrailer Expert Mike L - 04/22/2019


- APUBR-10
by:

Parts came in on time and were just what I ordered. Good job



- APUBR-10
by:

Not much to say, they went in fine, and secure the axle to the spring seats...



- APUBR-10
by:

Perfect fit, quality materials.



- APUBR-10
by:

After purchasing an order of springs, shackle kit, U-bolts, bearing kit and a new Pro jack for a trailer repair I discovered a week delay in shipping due to one of the items on back order. (Email the day after I ordered informing me of the delay) A call to Angie K. On that Sunday!!!! And she had an in stock item to replace it and had my order on its way Monday morning , Thank You Angie everything sent was what I ordered and correct. Communication was great and they did what they said they would, Good prices and free shipping on my orderThanks again



- APUBR-10
by:

I received the u bolts and plate assembly to replace the ones on my trailer as I had to replace the springs. These are a perfect fit and exact replacement on what I had. These came quickly and will work as expected.


Comments
better than new
Richard C - 09/30/2020


- APUBR-10
by:

U bolts and plates fit great. Good qual ity.



- APUBR-10
by:

Looks to be of great quality. Would recommend tightening to only 30 ft lbs. I initially started with 50 and managed to slightly bend a plate. Overall very happy with product.


Comments
Holding up well, no issues
Shawn - 04/14/2021


- APUBR-10
by:

Lock washer split open when I tightened down the nut with an impact drill



- APUBR-10
by:

Used these on replacement of my trailer springs after hitting an area of the road that had evidentally washed out. These fit great without having any issues. Just bolt on and tighten.



- APUBR-10
by:

AWESOME!!! Still going strong!



- APUBR-10
by:

Was just what I needed I should have ordered with my new axle and hubs


26
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Show More Reviews

Ask the Experts about this Redline Trailer Leaf Spring Suspension



  • U-Bolt Kit for 1-3/4" Round Axle
    There is a kit for 1-3/4 inch round axles, the U-Bolt Kit for Mounting 2,000-lb, Round Trailer Axles - 4-1/4" Long U-Bolts # APUBR-10. That said, these are for 2,000 lb axles that are found on RVs instead of a mobile home axle. The reason for that is mobile home axles are designed for a one-time use so people don't change the suspension. I have added a link to a video review of this kit for you to check out as well.
    view full answer...
  • Torque Specs for U-Bolts on 3,500 Pound Axles
    For 3,500 pound axle U-bolt kits like the Redline # APUBR-1 that use 1/2 inch hex nuts you will want to torque them down somewhere between 45 and 70 foot pounds. I have attached a great article on trailer suspension that includes this info along with details on all the other necessary components that you can look through.
    view full answer...
  • Torque Specs for 9/16" Trailer Axle U-Bolts
    The torque specs for 9/16" diameter u-bolts like the U-Bolt Kit for Mounting 5,200-lb to 7,000-lb, Round Trailer Axles part # APUBR-9 will be a range, from 65 ft. lbs. to 95 ft. lbs. If the tie-plates start to bend inside this range that would be a stopping point.
    view full answer...
  • Longest 1/2' U-Bolts Available for 3,500 Lb Round Axle
    The longest u-bolts we currently offer in 1/2" for a 2-3/8" diameter axle is 5-1/2" such as the U-Bolt Kit part # APUBR-1.
    view full answer...
  • Is Trailer Suspension U-Bolt Plate Supposed to Bend and What is Torque Spec for 3/8" U-Bolts
    Trailer suspension U-bolt plates can bend, yes, so it doesn't sound like you have anything to worry about. For 3/8 inch nuts on the U-bolts in kit # APUBR-10 they should be torqued between 30 and 50 foot pounds according to Dexter Axle.
    view full answer...
  • What Torque Should Be Used For U-Bolt Nuts On Trailer Suspension
    If the U-bolts are 9/16 inch diameter, the torque specs should be between 65 to 95 foot lbs. If the U-bolts are 3/8 inch diameter, the torque should be between 30 and 50 foot lbs.
    view full answer...
  • Replacement Parts for Long Chih Industrial LCI-850T Folding Utility Trailer
    The website for Taiwanese trailer maker Long Chih Industrial does not provide any specs or construction details for their LCI-850T folding utility trailer so I cannot tell you which parts you will need to complete assembly. However, we do offer all sorts of trailer hardware like u-bolt kit # APUBR-10 as well as other individual parts you can see on the linked page.
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  • U-Bolt Suspension Kit for 1-3/4 Inch Diameter Round Trailer Axle
    U-bolt kit # APUBR-10 is the only one we carry that fits a 1-3/4 inch diameter trailer axle. You would have to change the springs to 1-3/4 inch wide springs to use this kit. A larger u-bolt kit would not work because it can cause damage. To determine if we have springs that will work for your trailer I will need to know the type of springs you have, double-eye or slipper springs, and the measurements. A 1-3/4 inch diameter axle likely has a 2,000 pound capacity so we would be looking at...
    view full answer...
  • Availability of 3/8-Inch Diameter U-Bolts that Measure 4-inches x 3-1/2-inches
    We do offer several different u-bolts and axle kits with 3/8-inch diameter and all of these can be seen on the link at right. One such example is part # APUBR-10 which is a kit with 4 u-bolts, plates and nuts. None of these has the exact dimensions you quoted, please note. A second link will let you see all u-bolts we offer and the filters in the left-hand margin will let you sort the results based on length.
    view full answer...
  • Can Trailer Leaf Springs be Moved from Below the Axle to the Top of the Axle
    Some trailers have the leaf spring stack above the axle and some have it underneath. You can move the stack to the top of the axle but you will have to weld on new spring seats to the top of the axle. Use # TRSS175 for a 1-3/4 inch round axle. It will raise the height of the trailer some but you need to be aware that it also raises the center of gravity. That makes the trailer more susceptible to sway.
    view full answer...
  • How to Make a Trailer Axle Over Under Kit for 1-3/4 inch Round Axles
    All you would need for an over-under kit for a 1-3/4 inch round axle would be the U-bolt kit part # APUBR-10 and the spring seat part # TRSS175. You would need two of the spring seats.
    view full answer...
  • Replacing Suspension Hardware For Harbor Freight Single Axle Trailer With Slipper Springs
    The first thing you will need to determine is what the weight capacity of the trailer is. There should be a plate or sticker on the trailer or on the axle with those numbers. We offer a 2-leaf slipper spring, part # SP-179275, for 2,000-lb axles. I have attached a drawing of a leaf spring with the dimensions for the SP-179275 leaf spring you can check out. These springs measure 1-3/4 inches wide and have an eye diameter of 9/16 inch. The U-bolt mounting kit for these springs is part...
    view full answer...
    Image 1 for
  • Does Over Under Kit for 1-3/4 inch Axle Require Welding
    All you would need for an over-under kit for a 1-3/4 inch round axle would be the U-bolt kit part # APUBR-10 and the spring seat part # TRSS175 that you referenced. You would need two of the spring seats. You will need to weld the spring seats into place.
    view full answer...
  • Changed Trailer Deck From Steel to Wood Now Tires Rub Fenders When Towing A Load
    We carry over-under conversion kits that fit both a 2-3/8 and 3 inch axles. However, we do not offer a kit that will fit a 2,000 lbs axle, but we can put together a conversion kit for you that will work with your axle. You will need U-Bolt Kit for Mounting 2,000-lb, Round Trailer Axles, # APUBR-10 and 2 of Spring Seat, # TRSS175, for 2,000 lbs with 1-3/4 inch diameter. You will place a spring seat on the top of the axle to provide a place for your leaf spring to sit. The new spring seat...
    view full answer...
  • How to Determine What Hubs Fit Axle and if Larger Tires Fit Trailer
    So it may be possible to put on larger tires, but there is a few things that you need to know, starting with the hubs that fit, and there are some things that you need to do, starting by measuring your spindle to find out of there are hubs that fit that support larger 12 inch tires. To do this, you will need to take apart your hub assembly and look at the bearings themselves; wipe away the grease and you should be able to see the part number stamped directly on them. If you are unable to...
    view full answer...
    Image 1 for
  • Availability of Replacement Bearing and Dust Cap for Long Chih Industrial LCI-850T Trailer
    While we don't have exact replacement parts or a way to figure out what fits the specs of your Long Chih Industrial LCI-850T trailer, we should still be able to help you out. All you'll need to do is take some measurements to ensure that you get the correct parts. For a replacement bearing you need to use a digital caliper like part # 301-17068 and measure the spindle where the bearing rides to the 3rd decimal place (1.234 for example). If you could also let me know the weight rating of...
    view full answer...
    Image 1 for
  • Parts Needed to Flip Axle on a Pop up Camper
    I have exactly what you need, but it will have to come in the form of a couple parts pieced together because an over-under conversion kit or "axle flip kit" as some people call it isn't available for the smaller 1-3/4 inch round axles. To move your leaf springs above your axles, you will want the following parts: Qty 2 - Spring Seats # TRSS175 Qty 1 - U-Bolt Kit # APUBR-10 The spring seats will be welded to the opposite side of the axle as the current spring seats. You may not need the...
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  • Recommended 26 Inch Leaf Springs for 1,500 or 2,000 Pound Trailer Axle
    When measuring your existing leaf springs, you will want to measure the length from the center of spring eye to the center of spring eye. If you measured a length of 26 inches, then the 4-Leaf Double-Eye Spring # SP-124275 should be a perfect replacement if you have a 2,000 pound axle. To confirm your axle rating, I recommend checking for a plate somewhere on the axle itself that lists its capacity. Even if you do find that your axle has a 1,500 pound capacity, this leaf spring set will...
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  • Possible Solution for Bent A-Frame Trailer Due to Swivel Jack
    The frame members of a trailer really aren't replaceable. Your best option will be to take the trailer (carefully) to a fabricator to see if they weld in a new section of frame there. You should also have them go over the trailer to make sure there aren't any other structural issues that need addressing as well. Also be sure not to overload the trailer. It looks like it bent where the swivel jack was initially installed. You might have that front section of the trailer reinforced with another...
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  • Correct Spring Seat and U-Bolt Kit for my 1-3/4" Round 2,000 lb. Axle
    The Spring Seat for Typical 2,000-lb, Round Trailer Axles with 1-3/4" Diameter part # TRSS175 are confirmed to work with the U-Bolt Kit for Mounting 2,000-lb, Round Trailer Axles part # APUBR-10. The U-bolts are always slightly wider at the mouth than at the bend and they all fit together really well.
    view full answer...
  • Parts Required to do Over/Under Conversion on 1-3/4 Axle on Tractor Supply Trailer
    From what I was able to determine the Tractor Supply trailer you have likely has a 2000-lbs axle on it, which has a 1-3/4" diameter axle. There isn't a specific over/under conversion kit for that size axle but you can use 2 of the spring seat # TRSS175 and weld them on either end of your axle and then use the # APUBR-10 u-bolts you were looking at to complete the process. It should be noted that you need to have a qualified welder perform the installation of the spring seats.
    view full answer...
  • Does Trailer Spring Seat Need to be Welded to Axle
    You do want to weld the spring seat of your axle to it. If you are in need of a spring seat for a 3,500 lb axle you'd want the part # TRSS238 and you'd be set.
    view full answer...
  • Availability of U-Bolt Kit for 1-1/2 inch Trailer Axle
    For 1-1/2 inch square axles we have the axle u-bolt kit part # CE23102 which comes with mounting plates as well.
    view full answer...
  • Parts Needed to Flip 2,000 Pound Axle With Slipper Springs
    Technically the over-under conversion kit can be used with slipper springs if the spring seats are fully welded to the trailer axle and you would have to use a u-bolt plate that fits the springs. Since you have a 2,000 lb axle this doesn't matter since there is not a kit that fits a 1-3/4" diameter axle like the one you have. You can do the same thing with the U-Bolt Kit for Mounting 2,000-lb, Round Trailer Axles - 4-1/4" Long U-Bolts # APUBR-10 assuming you have 1-3/4" slipper springs....
    view full answer...


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