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  1. Trailer Leaf Spring Suspension
  2. Redline
  3. U-Bolts
  4. Axle Mounting Hardware
  5. Square Axle - 1-1/2 Inch
  6. 5 Inch Long
1-1/2" Square Trailer U-Bolts (Qty 2)

1-1/2" Square Trailer U-Bolts (Qty 2)

Item # SP01-120
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Retail:$25.77
Our Price: $14.14
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Trailer Leaf Spring Suspension
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Shipping Weight: 1.49 lbs
Quantity: 
In Stock
SP01-120 - 1/2 Inch Diameter Redline Trailer Leaf Spring Suspension
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Lowest Prices for the best trailer leaf spring suspension from Redline. 1-1/2" Square Trailer U-Bolts (Qty 2) part number SP01-120 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
  • All Info
  • Reviews (98)
  • Q & A (0)
  • Videos (1)
  • Photos
  • Why etrailer?

Redline Trailer Leaf Spring Suspension - SP01-120

  • U-Bolts
  • Axle Mounting Hardware
  • Square Axle - 1-1/2 Inch
  • 5 Inch Long
  • 3500 lbs
  • 1/2 Inch Diameter
  • Redline


Square Trailer U-Bolt

  • Width: 1-1/2"
  • Diameter: 1/2"
  • Length: 5"
    • Threaded portion measures 2"
  • For 3,500-lb axles only
  • Includes Lock Nuts

071090 Redline Square Trailer U-Bolts with Nuts and Washers





Video of 1-1/2" Square Trailer U-Bolts (Qty 2)

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




Video Transcript for Redline Trailer Suspension SP01-120 Review

Today we'll be reviewing part number SP01-120. This is Red Line's 1 1/2 inch Square Trailer U-bolts. You're going to get two U-Bolts and you're going to get four nuts. The width of the U-bolts. We're measuring the distance between the two bolt posts. Is going to measure an inch and a half.

Each bolt is going to give us a diameter of a half inch. The length that we have from the bottom of the cross member to the bottom of the mounting post or the bolt post is going to be 5 inches. The threaded portion going to measure right at 2 inches. This is for 3500 pound axles 00:43 only. Again, you're going to get two U-bolts, measure a half inch in diameter, and you're going to get four nuts.

That's going to do it for our review of part number SP01-120. This is Red Line's 1 1/2 inch Square Trailer U-bolts. .


Customer Reviews

1-1/2" Square Trailer U-Bolts (Qty 2) - SP01-120

Average Customer Rating:  4.8 out of 5 stars   (98 Customer Reviews)


- SP01-120
by:

I purchased these U bolts to upgrade the suspension on my trailer. I would get a a lot of trailer sway when I was towing my jet ski trailer. I bought the trailer used and never really looked at the springs. Unfortunately for me, There was nothing but one U bolt strapped diagonally across the spring. I'm no suspension expert but I knew this could NOT be safe. I did extensive research on trailer suspension. It was difficult to find parts for a 11/2 inch square axle. It was until I came across etrailer webpage. They had everything I required to upgrade and make my trailer safe to operate on the road. It was actually criminal what the person did to attach the original spring. I am greatful nothing ever happened while towing. Now with the new parts installed, I feel a lot better and my trailer does not sway anymore. I will definitely purchase my trailer needs from etrailer from now on. The pictures and videos make finding what I needed so much easier. The complete transaction from order to delivery was extremely efficient and the customer service is absolutely outstanding.



- SP01-120
by:

Works great but I wish they were galvanized for winter conditions. Thanks to Stacey for her assistance and quick shipping.



- SP01-120
by:

These U-Bolts were exactly what I needed to replace the 1 1/2" wide ones on my 1966 Silver Streak travel trailer. When I started this project I had no idea how hard parts were going to be to find. When I brought the original U-Bolts in to my local (Anchorage, AK) trailer supply place and also a custom spring shop they all looked at them like they had dropped in from outer space. etrailer had exactly what I needed to get our vintage trailer back on the road. This will be my first stop the next time I need parts for my not so standard trailer. Thanks etrailer.com!



- SP01-120
by:

Excellent product, bolted right on, great fit. Several orders through etrailer.com have yet to be disappointed



- SP01-120
by:

These were needed to replace ones that had loosened. I would add that I have tightened these 2x since install and would recommed to others to check them after install as they stretch into the axle.



- SP01-120
by:

I purchased the 3000# axle springs and all mounting hardware to replace the old ones on my 1963 travel trailer. My trailer no longer leans to the left and goes down the road better than new. I should have done it many year ago. I received my package on time and installation was easy and fit perfect. Thanks Bridget



- SP01-120
by:

very good products and excellent customer support.



- SP01-120
by:

I was very impressed with the quality of these square U bolts. The bends were smooth with no stress cracking. The legs of the bolts were parallel and the nuts were a very high quality.



- SP01-120
by:

Perfect fit. Everything went together very smoothly.


Comments
great, no problems with about 1000 miles on the new parts now.
Michael E - 05/10/2019



- SP01-120
by:

Worked great for my trailer.



- SP01-120
by:

I ordered these bolts to use on my '63 Shasta (Canned-Ham ) Compact camper. The old girl had developed a squat worse than factory and that sat low. I removed the axle and springs and moved the axle below the springs and added a new plate with a tab to mount shocks that this trailer never had. The ubolts arrived in about 1 week and worked perfectly. The camper is a joy to tow now.


Comments
Al, how did you deal with the nub on the bottom of the spring stack? I have 1 1962 Compact.
-- comment by: Don M - 08/11/2014

Comments
There is a square plate top and bottom .There is a hole I drilled in one for the rivet that hold the springs together.
-- comment by: Al - 08/13/2014


- SP01-120
by:

The U bolts and spring plates were of good quality, but the price was much higher than it should be. I needed them so I bought them, even though the price was way too high.


Comments
Good
Landy - 06/30/2019



- SP01-120
by:

I'll be using you guys more in the futu re.



- SP01-120
by:

Well I can't believe it's really been a year since I purchased all the parts from Etrailer to rebuild my jon boat trailer. I bought this tilt trailer on craigslist and well let's just say needed some MAJOR TLC. From the roller brackets, fenders, tires/wheels, hitch coupler, winch, etc.. All the parts have held up extremely well and I am VERY happy with not only the quality of the parts but the customer service as well. This is my "GOTO" place to buy parts for all 3 of my trailers!!



- SP01-120
by:

Was just barely able to use to the min thread. 1 1/2" thick axle and 4 leaf 3500lbs springs. Had to add standard Split Lock washers under nuts to get enough thread available. Torqued to 50 Ft Lbs and there was less than 1/2 of a thread available if I need to retorque. These are nice and heavy. 1/2" x20 Nuts that come with U-Bolts are Non Locking and you will need to add Lock washers and the thread should be higher up the U-Bolts like another 1/2 to 1 inch if a person uses a 3 leaf 3000lbs spring or less thickness in my opinion.



- SP01-120
by:

These are exactly what we were looking for. etrailer is the only place we could find the 1.5" Size in a 1/2" diameter square u-bolt.



- SP01-120
by:

Perfect fitting ubolts for new axle installation, no issue's after a year of heavy use.



- SP01-120
by:

The u-bolts that I ordered from etrailer arrived quickly, even tho I chose the economy shipping option. The bolts are a hard to find item and are exactly as shown on the etrailer website. I am very pleased and won't hesitate to make additional purchases from etrailer.com



- SP01-120
by:

I used these u bolts on a harbor freight folding trailer. I wanted to lift the trailer to put larger tires. After welding blocks on, these u bolts fit perfect.



- SP01-120
by:

Products arrived very quickly and in good shape. had to do some modification on installation as its an odd ball trailer but happy with the results . Jim.


Comments
Great!!
Jim R - 07/31/2015



- SP01-120
by:

Product was very easy to install, very well built and looks good on my trailer



- SP01-120
by:

Used these after moving axle from inside spring to under. Worked great. It is hard to find 1 1/2 inch u bolts that are 1/2inch. Thanks. Shipping was great.



- SP01-120
by:

Great product and support. My trailer is old, way old. Had a hard time finding parts till I found etrailer.


Comments
Trailer was sold, but the new owners have no complaints.
Matthew W - 08/04/2017



- SP01-120
by:

Exactly the item I needed! 3 places in my not so small but not so big town, did not carry these. I am glad that I looked on-line and the best part was the price was very reasonable for these u-bolts. Shipping was on time too!!



- SP01-120
by:

Worked great!


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Info for this part was:

Employee Patrick B
Expert Research:
Patrick B
Employee Adam R
Expert Research:
Adam R
Employee Kathleen M
Video by:
Kathleen M
Employee Cole B
Installed by:
Cole B

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