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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

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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 800-298-8924 for expert service.
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  • Reviews (170)
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Redline Trailer Leaf Spring Suspension

  • 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

Item # APUBR-9





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 Trailer Suspension - Leaf Spring Suspension - APUBR-9 Review

Today we'll be reviewing Part Number APUBR-9. This is Red Line U-Bolt Kit for mounting 5200 lbs to 7000 lbs round trailer axles. It's going to attach the trailer axle to your leaf springs, it's going to include four 7 1/4 U-bolts, 2 U-bolt plates for 1 3/4 inch or 2 inch springs, and then it's going to include eight 9/16 inch hex nuts. Spring seats are required for mounting the axle to the leaf springs and that's all going to be sold separately. It's going to fix axle diameters of 3 inches, typically 5200 lb to 7000 lb trailer axles. The spring width that this would fit is going to be 1 3/4 inch or 2 inch and we'll just take a few moments to go over some dimensions. We take a measurement of the length of the u-bolt, again we're measuring from the bottom of the cross member, to the base of the bolt post.

It's going to give us a measurement of 7 1/4. The threaded portion on each bolt is going to measure 3 inches. It's that portion there and then the width that we have in between is going to measure right at 3 inches and that's just a measurement between the bolt posts. Taking a look at one of the plates, it's going to measure 5 1/4 by 3 3/4. We measure the distance, center on center between the holes going this direction, it's going to measure 3 3/4 of an inch and then center on center going this direction is going to give us a measurement of 2 5/8 of an inch. That's going to do it for our look at Part Number APUBR-9, this is Red Line U-Bolt Kit for mounting round trailer axles and again the bolts are going to measure 7 1/4 of an inch in length.

.


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   (170 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:

The fit was perfect didn’t even have to trim the bolts 936165



- APUBR-9
by:

good quality parts 935111



- APUBR-9
by:

perfect fit, easy to assemble and great quality 932872



- APUBR-9
by:

928390



- APUBR-9
by:

Very helpful on finding the right parts and fast shipping would recommend them Very highly 927680



- APUBR-9
by:

Great product, easy to install. Would purchase again. 925057



- APUBR-9
by:

Works good. Suits my needs very good. 923257



- APUBR-9
by:

perfect match, as is described. same day shipped and fast delivery 922333



- APUBR-9
by:

921974



- APUBR-9
by:

915472



- 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! 913086



- APUBR-9
by:

901471



- APUBR-9
by:

900705



- APUBR-9
by:

works well 899989



- APUBR-9
by:

Fast service. 882017



- APUBR-9
by:

Good product 880331



- APUBR-9
by:

875238



- APUBR-9
by:

Products are just as advertised. Great product! 853518



- APUBR-9
by:

Parts came in fast and were great. 837210



- APUBR-9
by:

Perfect fit, another quality set of parts from etrailer. Cut the old ones off. Put new ones on. No fuss. 824711



- 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 820105


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
-- Heather A - 07/02/2020

84788
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
-- Heather A - 07/02/2020

84790

- APUBR-9
by:

Working great. 808314



- APUBR-9
by:

Nice hardware great upgrade. 795117



- 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 792968



- APUBR-9
by:

Got it fast and seem to be a great prod uct. 792154


27
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Show More Reviews

Ask the Experts about this Redline Trailer Leaf Spring Suspension

  • 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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  • 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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  • 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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  • 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...
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  • U-Bolt Kit for 6,000 lb Axle
    We have a similar kit that will work for your 3" round axle with the U-Bolt Kit # APUBR-9. This kit comes with four 7-1/4" u-bolts, two u-bolt plates for 1-3/4" or 2" springs, and eight 9/16"-18 Hex nuts.
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  • Thread Length of U-Bolt Kit for Mounting 5,200-lb to 7,000-lb Round Trailer Axles
    The threaded portion on each bolt of U-Bolt Kit for Mounting 5,200-lb to 7,000-lb, Round Trailer Axles part # APUBR-9 is going to measure 3 inches. I have attached a very helpful video that shows the measurements of the components of this kit for your reference.
    view full answer...
  • Dimensions of U-Bolt Kit for Mounting 5,200-lb to 7,000-lb # APUBR
    The U-Bolt Kit for Mounting 5,200-lb to 7,000-lb, Round Trailer Axles - 7-1/4" Long U-Bolts # APUBR-9 you asked about has overall bracket dimensions of 5-1/4 by 3-3/4 inches. The center on center hole measurements are 3-3/4 inches for your u-bolts and 2-5/8 inches between them for your leaf springs. Most double eye leaf springs will be 1-3/4 inch wide like # SP-198275 where slipper springs can be 2 inch like # SP-232275 and still work with this kit. Wider slipper springs like the...
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  • 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...
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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...
    view full answer...
  • 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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  • 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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  • 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...
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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 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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  • 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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  • 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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  • 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...
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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...
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  • Tandem Axle Trailer Suspension Hanger Kit To Provide More Axle Clearance
    It sounds as if your trailer suspension was built with the common Tandem-Axle Trailer Hanger Kit, # APT3, and that the springs and attachment hardware are wearing out enough that with the weight you are carrying there is no longer enough room for the suspension to work without contacting the trailer frame. I would recommend stepping up to the Heavy Duty Tandem-Axle Trailer Hanger Kit, # APT3HD, or the Tandem-Axle Trailer Hanger Kit, # AP233-H248. The # APT3HD kit comes with 2-1/2...
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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...
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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...
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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...
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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.
    view full answer...
  • 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...
    view full answer...
  • 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...
  • 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.
    view full answer...
  • Diameter of Center Hole in Equalizer in APT5 Tandem Axle Trailer Hanger Kit for Double Eye Springs
    The equalizer that comes in the # APT5 Tandem-Axle Trailer Hanger Kit is part # TREQE1. This eqalizer has a 9/16 inch diameter center and end holes. The # TREQE34 equalizer comes in the hanger kit # APT3HD. The # TREQE34 does have a 3/4 inch diameter center hole and 9/16 diameter end holes. Two wet bolts are included in the # APT3HD kit for the 3/4 inch diameter center holes on the equalizers.
    view full answer...




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Info for this part was:

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

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