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  1. Trailer Leaf Spring Suspension
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  5. Round Axle - 3 Inch
  6. 7-1/16 Inch Long
U-Bolt Kit for Mounting 5,200-lb to 7,000-lb, Round Trailer Axles - 7-1/16" Long U-Bolts

U-Bolt Kit for Mounting 5,200-lb to 7,000-lb, Round Trailer Axles - 7-1/16" Long U-Bolts

Item # APUBR-9
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Trailer Leaf Spring Suspension
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APUBR-9 - Round Axle - 3 Inch Redline Trailer Leaf Spring Suspension
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Mount your round, 3" 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 5,200-lb to 7,000-lb, Round Trailer Axles - 7-1/16" Long U-Bolts part number APUBR-9 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-9

  • U-Bolt Kits
  • Axle Mounting Hardware
  • Round Axle - 3 Inch
  • 7-1/16 Inch Long
  • 5200 lbs - 7000 lbs
  • 9/16 Inch Diameter
  • Redline

Mount your round, 3" 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) 7-1/16" Long U-bolts (176500)
    • (2) U-Bolt plates for 1-3/4" or 2" springs (117521)
    • (8) 9/16"-18 Hex nuts (916N)
  • Spring seats required for mounting axle to leaf spring sold separately


Specs:

  • Axle diameter: 3"
    • Typical 5,200-lb to 7,000-lb axle
  • Spring width: 1-3/4" or 2"
  • Dimensions: see below


U-Bolt Diagram



APUBR-9 U-Bolt Kit for 5,200-lb to 7,000-lb Round Trailer Axles





Video of U-Bolt Kit for Mounting 5,200-lb to 7,000-lb, Round Trailer Axles - 7-1/16" 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 Axles U-Bolt Mounting Kit Installation

Today on our fifth wheel trailer we'll be installing the Red Line U-Bolt Kit for mounting 5,200 pound to 7,000 pound round trailer axles. This is part number APUBR-9. Here's what our kit consists of. We have the two flanges here that will go on top of our axle which will secure our u-bolts to the top and hold our axle in place to release springs. We have the necessary two, one per side and then the necessary four u-bolts, and then the eight nuts to secure it. The reason you want this is in case you ever need to replace a bent or damaged u-bolt or hanger assembly, or if you ever need to remove one a lot of the times they have a nylon lock nut on and you cannot remove the nut easily without causing damage to the threads of the u-bolt.

As you can see here ours rusted and bent and they had to be cut to be removed. If you have a situation like we did here today, this is the perfect kit for you to replace this. Now that we've gone over what's included in our u-bolt kit, we'll go ahead and show you how to install it. As you can see here we just have our axle sitting atop of our release spring here, and it's not secured. This is where the u-bolts come in play, and they'll secure our axle to release spring. We'll take our plate here, notice it's got these ridges.

These bridges need to face up. Here's our centering pin on our release spring, it goes in the center hole here on our plate. We'll drop that over, as you can see that holds it in place. I have our two u-bolts here and our four nuts. We'll start with one u-bolt, come up from the bottom, take two nuts ... We'll take our second u-bolt just like we did on the outside edge, come up and place our nuts on.

Now we use a 7/8ths socket and a ratchet and we'll snug these down. See, now that they're snug we'll torque them down. When we do our final torque we'll do it like the lug nuts on a wheel, in a star pattern, just to make sure the torque is evenly applied to your bolts. With that done we'll do the same on the other side now. That completes our installation of the Red Line U-Bolt Kit for mounting 5,200 pound to 7,000 pound round trailer axles.

Part number APUBR-9 on on our fifth wheel trailer.


Customer Reviews

U-Bolt Kit for Mounting 5,200-lb to 7,000-lb, Round Trailer Axles - 7-1/16" Long U-Bolts - APUBR-9

Average Customer Rating:  4.8 out of 5 stars   (191 Customer Reviews)

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

- APUBR-9
by:

Excellent parts for the project I was working on. I installed a 1997 Chevy axle on a 1950 International box trailer. With a few “adjustments”, I made it work!



- APUBR-9
by:

Delivered as promised and installed as required. No problems with service and the product. Excellent company to do business with. Always glad to have etrailer available for go to supplies at lowest cost.



- APUBR-9
by:

Perfect fit, another quality set of parts from etrailer. Cut the old ones off. Put new ones on. No fuss.


Comments
As good or better than original, no problems at all
Chuck - 07/01/2021


- APUBR-9
by:

I chose this particular kit mainly for the 9/16" u-bolts. I could have easily used the 1/2" kit but it was a nice upgrade and not much difference in cost. These u-bolts and plates fit my car trailer perfectly without any modifications. Everything in product description was just what it said when I received them. Shipping was faster than I expected!



- APUBR-9
by:

i have installed them but have never taken the trailer out of the barn



- APUBR-9
by:

Heavy Duty U bolt kit worked perfect for my round 3" trailer axles.



- APUBR-9
by:

Worked great for my application. Quick shipping, pricing was best around.


Comments
Great. Just what I needed.
Alexander P - 03/28/2021


- APUBR-9
by:

I had rusted old bolts and leaf springs, these were great replacements. No issues look great work well and fast shipping.



- APUBR-9
by:

Great price and quality!



- APUBR-9
by:

Made these work. My original bolts were smaller and these had to be "made to fit", but these won't break.


Comments
Very Satisfied
Michael L - 09/18/2020


- APUBR-9
by:

3 U-bolt kits, the hangers, rockers, etc. kit for a triple axle trailer, and 3 new sets of leaf springs went on a home-made 25' gooseneck we converted from 2 axle to 3 axle. We had no problems at all with the trailer since installation, and we've had it loaded down pretty well with logs, lumber, tractors, and equipment. Everything has held up well after several hours of service on the road and off-road. etrailer has always been great to work with, have had fast, accurate delivery, and timely updates on order status, etc. We've never had a problem, so I can't say how well Customer Service is!



- APUBR-9
by:

Just what I needed....



- APUBR-9
by:

ordered for a restoration of older camper worked as expected



- APUBR-9
by:

I orderd u bolts and when we went to use them found the nuts that came with them was coarse threads instead of fine. We purchased the correct ones and then found they would not tighten all the way up do to threads being flattened half way up the u bolt. Had to end up using some old ones I had to complete the install of springs on trailer.


Comments
For a shorter 3 inch round axle u-bolt, we have part # CE15287GA
CE Smith Replacement U-Bolt w/ Nuts for 3" Round Axles - 1/2" Diameter - Galvanized
$14.32
, which measures 6-11/16 inches long x 12 inch diameter. This u-bolt will work with u-bolt plate part # CE20003G
U-Bolt Plate for 3" Diameter Axle, 1-3/4" Wide Spring - 1/2" Bolts - Galvanized
$9.27
.
-- Etrailer Expert Victoria B - 11/25/2019


- APUBR-9
by:

I finished installing my new springs on my trailer today. Every thing went together without any problem.i am very pleased with your product.



- APUBR-9
by:

Replaced the 4 leaf leaf springs on my 5th wheel with the 5 leaf leaf springs and the mounting kit, so far it seems to have solved the problem of the springs breaking. The trailer handles better then ever on the highway and the back roads. Couldn't be happier.


Comments
Couldnt be happier with the mounting kit and etrailer
robert s - 04/06/2018



- APUBR-9
by:

etrailer made this whole process as easy as possible. Chose the 3 to 5 day shipping got it in three days. The package was intact all the parts were there and the instructions were very good. I even went on the products website and checked out their installation videos. Those were also very helpful. As usual etrailer took good care of me. To steal a quote “I’ll be back”



- APUBR-9
by:

Etrailer is the perfect place to get anything. It's great products and fast delivery is on spot. I'll use this site for everything I need cause they have it all too. Thank etrailer your the best. I bought u bolts the last 2 orders and they were perfect quality.



- APUBR-9
by:

I was happy with the fast free delivery. There was just one problem. There was 8 washer's missing in the sack of nuts for the u-bolts. I just installed the u-bolts with no washers


Comments
The U-Bolt Kit for Mounting 5,200-lb to 7,000-lb, Round Trailer Axles does not come with washers. It comes with: 4 7-14 Long U-bolts 176500 2 U-Bolt plates for 1-34 or 2 springs 117521 8 916-18 Hex nuts 916N
-- Etrailer Expert Heather A - 07/02/2020

Comments
The U-Bolt Kit for Mounting 5,200-lb to 7,000-lb, Round Trailer Axles does not come with washers. It comes with: 4 7-14 Long U-bolts 176500 2 U-Bolt plates for 1-34 or 2 springs 117521 8 916-18 Hex nuts 916N
-- Etrailer Expert Heather A - 07/02/2020


- APUBR-9
by:

All new springs and u-bolts on a tandem axle Big Horn 5th wheel. Feeling alot better about the suspension on the '06 Heartland.



- APUBR-9
by:

The products from etrailer are great quality and received on time and have been very reliable



- APUBR-9
by:

After 30 years and many miles of towing, my trailer suspension finally succumbed to the ravages of Michigan roads and the salt used on them. I replaced the original single leaf spring suspension with a new multi-leaf system from etrailer.com and couldn't be happier with the results. The trailer tows much nicer now and with everything new and tight my tires are wearing at a much slower pace. I have since ordered a hitch coupler rebuild kit from etrailer.com which installed easily and is working very well. I wouldn't hesitate to recommend etrailer.com to anyone.



- APUBR-9
by:

These parts made installing the new springs much easier than struggling with rusty ones.



- APUBR-9
by:

Great product, I get everything I need for my fleet of goosenecks, brakes,springs,hitches all shipped right to my po box



- APUBR-9
by:

Package arrived as promised Quick delivery Rep Mariah was very helpful and pleasant to deal with! This is second order from etrailer and I will probably now use them exclusively for all my trailer needs!


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Show More Reviews

Ask the Experts about this Redline Trailer Leaf Spring Suspension



  • How to Determine Correct Replacement Leaf Springs for 7,000 lb Axle
    I can give you some guidance on how to determine the correct replacement leaf springs, and you are right that replacing all four of them at the same time is a good idea. What you'll need to do for double-eye springs (which is what I assume is on your 2017 Keystone Fuzion) is measure from the center of one eye to the center of the other eye and get a match as close as you can. Just take into account that the springs may have elongated a bit over time. For example, the only double eye spring...
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  • Recommended Equalizer, Leaf Spring, and Hardware for 2005 Weekend Warrior Suspension System Upgrade
    For your upgrade in trailer suspension on your triple axle Weekend Warrior toy hauler I recommend the E-Z Flex Triple Axle Suspension Kit with 7-3/4" Equalizers # K71-657-00. This kit comes with all the equalizers and hardware you need. Then you will use the 6-Leaf Double-Eye Spring for 6,000-lb Trailer Axles - 26" Long # SP-053275 and I recommend upgrading your axle u-bolts to the # APUBR-9. You will use the following quantities: 1-E-Z Flex Kit 6-Leaf Springs 3-U-bolt Kits This update...
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  • Will the 8K Roadmaster Comfort Ride Leaf Spring Suspension Kit Work With 7K Axles
    The Roadmaster Comfort Ride Leaf Spring Suspension Kit part # RM-2460-2580 will indeed work on 7,000 lb axles. The leaf springs would just be slightly overrated for what you need but there will be no problems with compatibility. It does require that you un-bolt the u-bolts so we recommend replacing them at this time using the U-Bolt Kit part # APUBR-9.
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  • Dexter EZ Flex Equalizers for 6,000 Pound Axles on a 2006 Heartland Bighorn 5th Wheel
    The length is good on the EZ Flex system # K71-653-00 but the height may be different depending on where you are measuring that 4-3/4 inches. On the EZ Flex the distance from the center of the mounting hole to the center line between the 2 bottom holes, straight up and down, is 2-7/8 inches. If your 4-3/4 inch measurement is diagonal then you will be good to go with this kit. For a u-bolt kit you can use # APUBR-9. The shocks might actually feel more effective with the EZ Flex kit installed....
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  • Could U-Bolt Kit # APUBR-9 Be Used with Roadmaster Comfort Ride Shock Absorber
    Since I am not sure the dimensions of your current U-bolts I can only give you a picture that has the dimensions for the # APUBR-9 for you to check out and compare to what you have to see if these will fit and give you the extra length you'd need. These are 3 inch axle U-bolts though which are what the # APUBR-9 is designed to fit.
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  • Replacement Axle Needed for Dexter Axle Mobile Home Axle
    Thank you for all of the good info! Since mobile home axles are just meant to be used once we want to focus on weight capacity and fit with your trailer frame to make sure we get something that is a good replacement. I'm guessing that when you measures the 75-1/2" width of your trailer frame that you were measuring outside to outside so the 6K Dexter Trailer Axle w/ Electric Brakes # 8327830-EB with the 74" spring-center and 89" hub-face measurements should do the trick. I do recommend...
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  • Material Grade and Torque Spec of the U-Bolt Kit part # APUBR-9
    The U-bolts of the U-Bolt Kit part # APUBR-9 are Grade 5. The torque specs for 9/16 diameter U-bolts like this is 65-95 ft lbs.
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  • Can a Dexter 5,200 Lb Axle Be Replaced With a Dexter 6,000 Lb Axle
    It sounds like you are asking if you can use the Dexter Trailer Axle Beam part # 8327826 to replace the axle beam included with Dexter Trailer Axle with Electric Brakes part # 8327816-EB and reuse the braking assemblies and hubs/drums. If that is the case then yes you can as the diameter of the spindle where the bearings and grease seal ride are the same. Therefore, even though they may use a different outer bearing, the diameter for the inside of the bearing where it sits on the spindle...
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  • Compatibility of Axle U-Bolts for the RM-2460
    The holes in the top plate of the Roadmaster Comfort Ride Shock Absorbers # RM-2460 are for 9/16 inch diameter u-bolts like # APUBR-9. The system will actually utilize your current u-bolts for mounting those plates. I reached out to my contact at Roadmaster and the bolt hole size on the 3" shock plate is slightly slotted so it is 0.6" x 0.75".
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  • Replacement Leaf Springs, Equalizers, and U-bolts for ALKO T52 Axles
    Those may not be the original springs on your Springdale. According to ALKO the T52 axle would either have a 5 or 6 leaf spring at a length of 26 inches. To be accurate the springs should be measured with no weight on them because they will otherwise flatten out some leading to a longer measurement. ALKO shows the 4-leaf spring for the T52 at a length of 25-1/4 inches. If you measure it at about 25-1/4 inches with no weight on the spring then you can use # SP-218275 for 5K axles. If it...
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  • Recommended U-Bolts for Weekend Warrior LE-3305 Axle Flip Project
    To convert your axle for a top mounted leaf spring I would recommend replacing the U bolts, nuts and tie plates, so your best bet would be to go with a U bolt kit. For a 2-3/8" round axle use # APUBR-1 For a 3" round axle use # APUBR-9 You don't want to actually turn the axle over, because it would have your wheel camber going the wrong way.
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  • Recommended Slipper Spring And U-Bolt Kit For Trailer With 7,000 Lb Axle
    We have just what you are looking for. The slipper springs we offer for a 7,000 lb axle are part # SP-232275. This is a 5-leaf spring that measures 26-5/8 inches long and 2 inches wide. It is always recommended to replace both sides of the trailer suspension at the same time to make sure they wear evenly and support the trailer evenly as well. You can check out the attached photo with the dimensions noted for the leaf spring. When checking the dimension of the spring you will want to...
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  • Parts Needed to Replace Leaf Springs, Shackles and Hangers on a Tandem Axle Trailer with 3 Inch Axle
    The # SP-218275 springs are not designed for use with a 3 inch Dexter axle. A 3 inch axle is rated for at least 6,000 pounds so you would need to go with the # SP-198275, 6-Leaf Double-Eye Spring. The # SP-198275 spring has a 24-7/8 inch length and will have the same axle spacing, 34 inches, as the # SP-218275 spring that you referred to. You should check your current axle spacing or wheel and tire size to be sure the 34 inch spacing will provide clearance to mount the tires on your trailer. To...
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  • Recommended Replacement Leaf Springs and U-Bolts for 2005 Sierra Sport 24 Foot Toy Hauler
    For your 2005 Sierra Sport 24 foot toy hauler, you will want the U-Bolt Kit for Mounting 5,200-lb to 7,000-lb, Round Trailer Axles # APUBR-9 for each axle, and then you will want the 4-Leaf Double-Eye Spring for 6,000-lb Trailer Axles - 25-1/8" Long # SP-221275. This will work well with your current EZ-Flex Equalizer.
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  • Hanger Kit Recommendation for a 6K Axle on a Tandem Trailer
    There are two spring options that would work for you, the part # SP-115275 that you referenced or the 5 Leaf Spring part # SP-111275. The only difference is that the # SP-111275 is a multi-leaf spring with a 100 lbs more capacity than the # SP-115275. Either would work fine for you, I would go with the # SP-111275 just because of the additional capacity, and with a multi-leaf spring if a leaf fails your trailer wouldn't be completely un-usable. You would be able to limp home to fix the...
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  • 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.
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  • How to Determine Correct U-Bolt Kit and Leaf Spring Bushing for a 6,000 Lb Trailer Axle
    A 6,000 lb axle is usually going to be 3" in diameter. Therefore, for the u-bolts you can use part # APUBR-8 for 7" long or part # APUBR-9 for 7-1/4" long. You can measure your existing u-bolts or from the bottom of the axle to the top of the leaf spring pack in order to determine which length you need. You can always choose the longer option and cut away any remaining threads if necessary. Most leaf springs for 6,000 lb axles are 1-3/4" wide and will use a 9/16" bolt. If this is the case...
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  • Replacement Leaf Springs, U-Bolts, Shackle Straps, and Hardware for Three 7,000 Pound Trailer Axles
    When replacing springs always replace them in pairs (2 springs per axle) but if you are going to replace all 6 then that is even better. When measuring a spring you have to do it with the weight off of the spring by either removing the spring or jacking up one side of the trailer and measuring on that side. The reason I bring that up is because the double-eye springs that we have do not have the exact measurements that you have provided. Spring # SP-198275 is a close option. Eye to eye...
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  • AL-KO 5200 lb Axle Mounting Bolt Size
    The U-Bolt Kit for Mounting 5,200-lb to 7,000-lb, Round Trailer Axles - 7-1/4" Long U-Bolts # APUBR-9 are 9/16 inch diameter. These hold the axle to the leaf springs. The bolts that hold the springs to the frame are also 9/16 inches and # 166081.
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  • 3 inch Axle U-Bolt Kit Recommendation for Trailer Suspension
    Sounds like you are looking for a 3 inch axle u-bolt kit. For that you would need the part # APUBR-9 which comes with the U-bolts, plates, and nuts.
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  • 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...
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  • Can a Three Leaf Spring Stack Be Used To Replace a Two Leaf Spring Stack
    Yes, you can replace a two leaf spring stack with a three leaf spring stack so long as your center to center (double eye springs only) measurement matches but please note the loaded and unloaded as well as the new and used center to center measurements will be different. There is a correlation between the numbers of leaves in a stack and the weight capacity of that stack but there are also two leaf spring stacks with the same weight capacity as three leaf spring stacks so going by the rated...
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  • Loc-Tite for Tightening U-Bolt Nuts of U-Bolt Kit
    You can use Loc-Tite if you would like when tightening the nuts of your U-bolt kit. It's not required but it won't hurt. The torque specs for 9/16 diameter U-bolts like the # APUBR-9 is 65-95 ft lbs. With that amount of torque on the nuts they would not back off. For Loctite you could use the part # LT37420.
    view full answer...
  • How to Raise a 2011 Dutchmen Aerolite Trailer with Axle Flip Kit
    Yes, you can install lift blocks between the leaf spring perch/seat and leaf springs on your trailer to give you additional clearance between the top of your tire and trailer fender. However, you will also need longer u-bolts for this like the U-Bolt Kit part # APUBR-9 which is 7-1/4" long. We currently do not carry lift blocks so you will need to source these elsewhere. The other option you have which would perhaps allow you to retain more of the factory ride quality is to install taller...
    view full answer...


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Info for this part was:

Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Kathleen M
Video by:
Kathleen M
Employee Zach D
Video by:
Zach D
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Brent H
Test Fit:
Brent H

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