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Replacement U-Bolt with Nuts for 3" Round Trailer Axles - 1/2" Diameter

Replacement U-Bolt with Nuts for 3" Round Trailer Axles - 1/2" Diameter

Item # 1755892
Our Price: $13.36
Trailer Leaf Spring Suspension
Shipping Weight: 0.9 lbs
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Redline Trailer Leaf Spring Suspension - 1755892
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This 7" long U-bolt works with a U-bolt plate and another U-bolt to help secure your 5,200-lb, 6,000-lb, or 7,000-lb round trailer axle to its leaf springs. Bolt is 7" long and has an inner width of 3". 2 Nuts included. Great Prices for the best trailer leaf spring suspension from Redline. Replacement U-Bolt with Nuts for 3" Round Trailer Axles - 1/2" Diameter part number 1755892 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (33)
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  • Videos (2)
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Redline Trailer Leaf Spring Suspension - 1755892

  • U-Bolts
  • Camper
  • Car Hauler
  • Utility Trailer
  • Round Axle - 3 Inch
  • 7 Inch Long
  • 5200 lbs - 7000 lbs
  • 1/2 Inch Diameter
  • Redline

This 7" long U-bolt works with a U-bolt plate and another U-bolt to help secure your 5,200-lb, 6,000-lb, or 7,000-lb round trailer axle to its leaf springs. Bolt is 7" long and has an inner width of 3". 2 Nuts included.


  • Replacement U-bolt acts as part of a trailer suspension system
    • Used with another U-bolt (sold separately) and a U-bolt plate to secure one side of your axle to a leaf spring, which is mounted to your trailer's frame
  • Round bolt fits round trailer axles
  • 1 U-bolt and 2 nuts included


  • Application: 3" diameter axles
  • Inner width: 3"
  • Length: 7"
  • Bolt size: 1/2"-20

U-Bolt Diagram

1755892 Redline U-Bolt with Nuts for 3" Round Trailer Axles - 1/2" Diameter - 7" Long

Video of Replacement U-Bolt with Nuts for 3" Round Trailer Axles - 1/2" Diameter

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

Video Transcript for 3 Inch Round Trailer U-Bolts Installation

Hi there trailer owners. Today we're gonna be taking a look at red lines line of replacement U bolts. Round U bolts are commonly used to hold your leaf spring stack onto your axle. And if you're making any repairs to your trailer it's possible that the threads can get damaged where you can't reuse the U bolt. You might have to replace them in that instance, or if you had some sort of blowout or any other kind of damage where you might've had some damage that caused some issues with your U bolts here you may need to replace those as well. Over time if you've constantly taken these off they do stretch out over time.

So it is a good idea to replace them. If you've had several repairs done and remove them. The ones that redline have, offer slightly longer length. So that way you can ensure it's going to be a fit for your trailer. We also recommend these.

If you're gonna be adding accessories to your trailer and you need the additional length if that accessory goes under a U bolt we can see our factory U bolt here on the trailer We we're just working on if we wrap it around and we can see it only goes up about that high. This is about six inches in length. The new one here that we put on is about seven inches in length and it gives us the extra length that we needed to be able to install the mounting plate for the shock absorbers that we just installed on here. With our factory U bolt we'd have almost no threads here sticking out. So our nut would be able to go on but it wouldn't be able to be properly torqued with enough threads to ensure that it's gonna stay torqued in that position.

Today, we're showing off the three inch wide U bolts with a half inch diameter. These have a seven inch length, and we're gonna use those to get our comfort ride system installed but we have them available on all the various sizes. So that way you can ensure you got a replacement for your trailer. We have them down as small as an axle diameter of one and three quarters of an inch. That's going to be your 2000 pound axles all the way up to an axle that is five inches in diameter.

And that's gonna be your larger axles that are around 12 to 15,000 pounds. Now the diameter of the U bolts do change as the sizes go up.Your smaller ones that only are for the one and three quarter inch axles typically have a size of three eights and of diameter while your large ones, with that five inch wide axle length is going to have a diameter of a U bolt of about three quarters of an inch to ensure that it can handle that weight rating of that. Now there are a couple of different U bolts that do have an overlap. The three inch ones that we're using here also have another three inch version available. That's in a nine 16th diameter. So you want to just check your trailer and your old U bolt to make sure you're replacing it with one that's going to be accepted acceptable with the hardware that you have on here. Cause we wouldn't be able to take a nine 16th and slide it through these brackets because the bracket on here was designed for a half inch. Replacing your U bolt is pretty easy. The smaller your trailer is usually the easier it is. Those larger U bolts. You are going to need to have a little bit more strength required to remove and torque down the nuts ' cause they are typically a higher torque value for the larger the U bolt. When taking them off you wanna make sure your axle is properly supported. If you follow along with us, we'll show you an example of how to remove and swap out the U bolts. We'll begin our installation by parking our trailer onto level ground. Your driveway in most cases is a great spot and lifting it up and removing our wheels. You'll wanna Jack it up and support the frame with Jack stands. You have to get it high enough off the ground where your wheels are off the ground so you can get those pulled off. And once you've got those pulled off here you are set up to begin working. We're using a lift here on ours to hold ours up. But again, it's gonna be very similar at home. You're just not gonna have the cross beam with the lift. You'll have just these Jack stands here underneath your frame. Now the Jack stands that I've got here. These are just precautionary Jack stands that are underneath the axles because we're going to be taking the U bolts loose. And once we take those loose, the axle can drop down. But I also have my Jack here underneath the axle and I'm gonna be moving this Jack around and keeping it under the axle that I'm working on this 'cause the Jack stands are really just supplementary in case something happens. My Jack, where two something we're to happen to the Jack with a fluid leak out we got a Jack stand here to support it. So we're going to remove the nuts here on top to take these U bolts off, the U bolts that are on your trailer. Aren't gonna be long enough to accept the brackets for the comfort ride system. So we are going to be replacing these U bolts. You can get new U bolts here at etrailer. Once we get these off, we'll show you the new U bolts. We're using a three quarter inch socket to remove the nuts, they are gonna be on there little snugs if I have to start it by hand, and then your tool can zip it off easily the rest of the way. Now we've got these all zip loose. We can pull our U bolts out of there. They just pull down. They're usually a little bit stiff. So just kind of working back and forth and just pull downward, come out of there. You can also kind of rock the top piece here. sometimes that helps . If you pull it over like this you can kind of get a little bit of a bang motion on it. To help persuade it off of there. So now we've got our factory bracket out of the way. This is your comfort ride. Your shock bracket. You'll have four of these in the kit and they are gonna be specific to a certain location. So we've got them set out here for the axle. So this is going to be for the front axle towards the front. We want this bracket to be angled down towards our equalizer here. And we also want to make sure that the holes are flat facing towards the center of our trailer like that. And the one for the axle behind this is gonna face like this. So these brackets are gonna be angled like this, on the opposite side of our trailer we want the same story to be mimicked over there. So we'll take our bracket now we'll set it on top of our leaf spring you see there's alignment pin there that does line up with the hole in the bracket. We can then set our factory bracket right back on top grab our new U bolts. We'll go up through the bottom through our shock bracket and our factory one. And then we'll secure it with the new nuts that came included with the U bolts. We'll do the same thing with the other two sets of holes right over on the other side of our leaf spring stack. Once we got them all started we can go back and tighten them down. You do wanna kind of go back and forth to try and tighten them down evenly. So you have roughly the same amount of U bolts sticking up above each night. So now we'll torque our hardware to the specifications found in your instructions. And that completes our look at red lines line of replacement, U bolts..

Customer Satisfaction Score:

Customer Reviews

Replacement U-Bolt with Nuts for 3" Round Trailer Axles - 1/2" Diameter - 1755892

Average Customer Rating:  4.8 out of 5 stars   (33 Customer Reviews)

This 7" long U-bolt works with a U-bolt plate and another U-bolt to help secure your 5,200-lb, 6,000-lb, or 7,000-lb round trailer axle to its leaf springs. Bolt is 7" long and has an inner width of 3". 2 Nuts included.


Performing well after a year. Still on the Trailer.. No issues


They worked fine


This u-bolt made a great trailer hitch holder as seen in Trailer Life mag. The price was just right. My local auto parts store wanted $15 for one just like it. Just slip a short piece of garden hose over one end. You can leave it on the hitch head for easy removal from the receiver.



What else can I say about a U-bolt. I love it.


Arrived exactly as described in the product description. I used the U-bolt in conjunction with the combo bar 12" to fabricate a hitch receiver for my bike rack for my motor home.



Everything still works perfectly. Thanks!


I had messed one of the U-bolts in the set and etrailer did an awesome job getting me this individual replacement the next day so I wasn’t delayed using our travel trailer.


Just what I needed to install my new leaf springs. Amazing customer service, ordered and shipped the same day


Unfortunately this is not 1/2. This is .4 inches, too small for what I need. This was recommended as a replacement for out of stock part number Originally wanted.


the products that i received were awesome and the shipping was quick. i was able to get my trailer back on the road quickly. packaging could use a bit better attention. the springs had broken out through the box.. thanks buck


I ordered four of these (enough for one axle) to see if they would fit. I received them yesterday and they all fit perfect at first glance. Need to test some things out, but if all goes well, I'll be ordering many more.

Next in my list is bearings. I need to get the sizes, but if you can supply those, it would be fantastic.

All in all, this was a great experience. Good price, good timing, no issues.




Correct parts and worked as they should. Replaced springs and hardware on one side of trailer the day i recieved parts.


Direct replacement for the existing U-bolts. Just needed a longer version for the thicker springs that I ordered.


Exact and perfect


Product fit and is holding up well. These replaced all the u-bolts on a 11T triaxle deckover equipment trailer.


Good quality equipment The special shipping rates are very good. better than just regular ground. They called to let me know that additional items were coming to replace some that had been shipped. No extra charge.


All the parts ordered worked great. Susan did a great job in finding a way to get all the u bolts in stock by finding two different sets to put together so I would not have to wait for several to come into stock for my order and at about the same cost. Managed to get the trailer together in time to do a trail work project that was on the schedule before these broke.


Can always count on the best from etrai ler.


Still going! This is a good quality pro duct.


Part arrived promptly and fit exactly. Very Pleased!


Fit the axel perfectly!


Products worked great. ...Super fast shipping. ...



Great product


Great products worked as described. Way better than the original parts


Buy American please


as described...shipped fast

Show More Reviews

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

  • Correct Replacement U-Bolt for Toy Hauler Trailer with 3" Axles
    I have just what you need to replace the u-bolt on your toy hauler trailer with 3" diameter axles, the Replacement U-Bolt with Nuts for 3" Round Trailer Axles part # 1755892-Z.
    view full answer...
  • U-Bolt Kit Similar to APUBR-8 But with Galvanized U-Bolts
    The U-bolt kit part # APUBR-8 contains the U-bolts part # 1755892 that you also referenced. It just also contains the nuts and plates needed which you would need. For a kit with the # 1755892-Z you would just also need the plates part # TRTP300200 for if you have 2 inch wide springs or part # TRTP300175 for if you have 1-3/4 inch springs.
    view full answer...
  • U-Bolt Kit for a Trailer with 3 Inch Diameter Axles Rated for 7,000 Pounds
    Sticking with the 1/2 inch u-bolts is perfectly fine for your 7,000 pounds axles. Going to 9/16 inch wouldn't hurt either and if you decide to go that route then you will also need to replace the u-bolt plates and the nuts. For a kit that includes the u-bolts, plates, and nuts I recommend # APUBR-9. You would need 1 per axle. I have included a link to a video of this product for you.
    view full answer...
  • 1/2 Inch Diameter U Bolt that is 7 Inches Long
    I would be happy to help you. Here is a 1/2 inch diameter u bolt that is 7 inches long. It is for 3 inch diameter axles. It is the Replacement U-Bolt with Nuts item # 1755892-Z. I have also linked our entire selection of u-bolts.
    view full answer...
  • Replacement Leaf Springs For a 2015 Jayco Eagle 5TH Wheel Camper
    The 4-Leaf Double-Eye Spring # e47SR are rated for 3,000lbs per spring. To confirm that these are a correct fit for your 2015 Jayco Eagle 5th wheel you will want to confirm the spring measurements. A-12-9/16" B-13-5/16" C-25-1/8" D-3-1/8" I recommend replacing the U-Bolt with Nuts # 1755892 to reduce the chances of the original bolts having damaged threads or built up corrosion.
    view full answer...
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  • Replacement 1/2" - 20 Nuts for Trailer Suspension U-Bolt Kit
    We do have the Redline Replacement Nut # 12N-Z which was designed as a replacement nut for trailer U-Bolt suspensions like the kit # 1755892 you are looking to get. It isn't a flange nut like what initially comes with the kit but it will still work as designed. Typically this bolt and nut should be torqued to about 70 ft-lbs each. If you don't have a torque wrench already then we do have some options here like the Powerbuilt # ALL944001.
    view full answer...
  • Recommended U-Bolts for a 5,200 lbs Axle
    For replacement U-Bolts I recommend two of the U-Bolt Kit item # APUBR-8 as it includes the correct length U-Bolts for the item # e34SR springs, new U-Bolt plates, and new nuts. I would not recommend reusing your existing u-bolts plates since you're going to be replacing everything else. Cost wise it would be less expensive to buy two kits. If you decide to keep your bolt plates you would need eight of the Replacement U-Bolt with Nuts item # 1755892.
    view full answer...
  • Compatibility of Round Cargo Box U-Bolts with Square Roof Rack Crossbars
    Its easy to modify a cargo box to fit a new vehicle that has differently-shaped roof rack crossbars. However you may not need to do anything to get your Karrite Explorer cargo box's hardware to work on your vehicle with square cross bars. It is perfectly okay to use rounded u-bolt hardware like # 1755892 on a square bar. The replacement hardware kit # SR05587 that we offer for your Explorer cargo box actually uses rounded u-bolts. As long as you can tighten down the hardware you have...
    view full answer...
  • Corrosion Resistant Leaf Spring Mounting Hardware for 3 inch Round Axle with 2 Inch Leaf Springs
    We do indeed offer U-bolt and plate kits for a 3 inch diameter axle tube that can be used on 2 inch wide springs, part # APUBR-9 for a 7-1/4 inch long U-bolt or # APUBR-8 for a 7 inch U-Bolt. These bolts and plates are constructed of steel and aren't galvanized. We do offer galvanized U-bolts and zinc plated plates separately. For a 7 inch long by 1/2 inch diameter galvanized U-bolt suitable for a 3 inch round axle and 2 inch wide spring, use part # 1755892-Z. For a U-bolt plate for a...
    view full answer...

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Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
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Adam R
Employee Dustin K
Video by:
Dustin K
Employee Cole B
Installed by:
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Employee David F
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Employee Lisa S
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Employee Chris R
Video Edited:
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