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

2" Square Trailer U-Bolt (Qty 2)

Item # SP01-160
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Trailer Leaf Spring Suspension
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Redline 9/16 Inch Diameter Trailer Leaf Spring Suspension - SP01-160
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Square Trailer U-Bolts Lowest Prices for the best trailer leaf spring suspension from Redline. 2" Square Trailer U-Bolt (Qty 2) part number SP01-160 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (125)
  • Q & A (17)
  • Videos (1)
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Redline Trailer Leaf Spring Suspension - SP01-160

  • U-Bolts
  • Axle Mounting Hardware
  • Square Axle - 2 Inch
  • 5-3/4 Inch Long
  • 3500 lbs
  • 9/16 Inch Diameter
  • Redline

Square Trailer U-Bolts


Features:

  • 2" Wide
  • 9/16" Diameter
  • 5-3/4" Long
  • Length of threaded section: 2-1/2"
  • Inner width: 2-1/8"
  • Includes nuts


SP01-160 2" Square Trailer U-Bolt (Qty 2)





Video of 2" Square Trailer U-Bolt (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 SP01-160 Review

Today we are reviewing SP01160. This is a set of two 2-inch square trailer U-bolts and they are used with U-bolt plates for 2-inch square axles. Those are sold separately as part number 117594 and that plate, along with these U-bolts will secure the trailer axle to the leaf springs and those are mounted to the trailer frame. So, what you have here are two 9/16th inch diameter bolts that are, here we go, 5-3/4 inches long. The threaded portion right here, as you can see, is 2-1/2 inches long and the diameter, inside-to-inside here, is 2 inches. These bolts do come with the nuts that you will need and that is it for Part Number SP01160 from Redline, 2-inchSquare Trailer U-Bolts.


Customer Reviews

2" Square Trailer U-Bolt (Qty 2) - SP01-160

Average Customer Rating:  4.8 out of 5 stars   (125 Customer Reviews)

Square Trailer U-Bolts

- SP01-160
by:

Products are as advertised and of excellent quality. Prompt shipping and professional. No fuss, no muss... what more could I ask for! 501219


Comments
Still on my boat trailer no issues!
Christian - 04/27/2019

54556

- SP01-160
by:

Cheap China parts 398232



- SP01-160
by:

my friend ordered springs and hardware for my pontoon trailer. man did they get here fast. everything in one box. packed real good. no damage, nothing lost or left out. I finally got everything back together. fits great. i was worried that the springs where going to be to light, but the trailer sits just like new. sorry no pics. I was to greasy to get the camera out. But its like new again. yes etrailer.com i'm gonna be back next time I need parts. and i've already told all my friends with boats and trailers about etrailer.com . I am a happy customer. thanks again. C Finley 317074


Comments
Thanks for your follow up. Parts are still doing fine. I am still veryhappy with my shopping exp. With etrailer, and I have had the opportunityto share my exp with several people hope they come shopping with you.
chuck f - 11/15/2017

30873
Comments
Thanks for your follow up. Parts are still doing fine. I am still very happy with my shopping exp. With etrailer, and I have had the opportunity to share my exp with several people hope they come shopping with you.
chuck f - 11/15/2017

30878

- SP01-160
by:

Great service and parts where correct thank you etrailor 755034



- SP01-160
by:

Sure makes it easier to use new parts that fit right. 747000



- SP01-160
by:

perfect fit and fast delivery. 739712



- SP01-160
by:

Fit perfect 732528



- SP01-160
by:

good value fast shipping 706181



- SP01-160
by:

I like this company. Parts fit. Good qu ality 713218



- SP01-160
by:

order arrived complete and on time and worked as advertised, very satisfied thank you 677699



- SP01-160
by:

Parts arrived promptly, and exactly as ordered. The process was completely seamless and hassle free. 660573



- SP01-160
by:

SP01-160 U Bolts look to be good quality just wish they came with lock washers. TRTP200175 U Bolt spring plates work well with these U Bolts. I ordered 4 of these and got 1 and 3 #117594 plates which are very nice and look more heavy duty. I thought I got stiffed with the one oddball one but I didn't I ordered the cheaper ones and got 3 of the heaver duty ones. I also ordered #LC281285 Never Fail Tandem Axle Suspension Hardware Kit and one bolt in the kit is to long like its for a 2" wide spring. Guess I will just use one of the old ones I took out. And 4 #SP-051275 4 leaf double eye leaf springs. I am redoing the suspension on a fiber splicing trailer that was damaged during hurricane Michael. All in All etrailer has great prices and fast shipping and great customer service. 653954



- SP01-160
by:

as described 640734



- SP01-160
by:

Worked well, shipped fast, install was easy 640539



- SP01-160
by:

U-bolts worked great 639700



- SP01-160
by:

Very heavy duty steel and worked for my application. Sadly they are not galvanized; hence the 4 star rating. I prepped, primed, and painted them well so they should hold up. Used to hang fenders on a boat trailer. 611529



- SP01-160
by:

Just installed, not driven with it yet, but works as designed. 602441



- SP01-160
by:

LIghtning fast shipping. Great email communication. High Quality Product. 582590



- SP01-160
by:

Dynamite sales lady, product and servic e. 581502



- SP01-160
by:

this is a great product , looking for economic pricing , friendly and fast shipping, look no further but to etrailer thanks guys 560736



- SP01-160
by:

My second purchase from etrailer and I am happy to say the results were as expected 1. Items as described 2. Delivery was on time as promised (Of course once it is out the door it depends on the carrier to make the promise good) 3. Customer service is stellar, notifications... we got your order....we shipped it today.... we were notified it was delivered.... are you happy 553313



- SP01-160
by:

Just what I need to properly replace my leaf springs. Quality materials - solid. 540572



- SP01-160
by:

Products are as advertised and of excellent quality. Prompt shipping and professional. No fuss, no muss... what more could I ask for! 501220


Comments
Still on my boat trailer no issues!
Christian - 04/27/2019

54557

- SP01-160
by:

Very pleased with all my purchases from this company. No issues. I would recommend. 496707



- SP01-160
by:

Great bolts for my 2" axle over 2" springs. Much heavier than the OEM bolts, not worried about them breaking anytime soon. Chose to cut them down by 1.25" to better fit the spring gap on my overslung axle to maximize spring travel length on my HF trailer, but that was a personal choice, not a requirement. 428606


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Show More Reviews

Ask the Experts about this Redline Trailer Leaf Spring Suspension

  • U-bolts for Gooseneck Trailer hitch Safety Chains
    U-bolts for gooseneck hitches have springs on them so that the retract down when not in use. U-bolt kit # C113 sounds like it would work for you with the measurements you have provided. The u-bolts are 2 inches wide on center and the springs, washers, and nuts are included.
    view full answer...
  • How To Choose The Correct Leaf Spring U-Bolt Diameter Size On A Trailer Axle
    You will want to choose the diameter size of U-Bolts you need by the axle type (round, square) and the axle diameter. The Redline 2 Inch Square Trailer U-Bolt, part # SP01-160, you have referenced is for a 2 inch square axle. It is a 9/16 inch diameter bolt. The 9/16 inch diameter U-Bolts are used on 1-3/4 inch and 2 inch square axles, 2-1/2 inch round axles, 3 inch round axles, and 3-1/2 inch round axles. I am including a link to a page of the available 9/16 inch diameter U-Bolts. The...
    view full answer...
  • U-Bolts to Attach Bunk Brackets to Trailer with 3 inch Frame
    For a 3 inch trailer frame like you said you have we have the U-bolts part # 7163183UB which will work great for attaching roller bunk brackets like the part # CE10000G-4. The inside portion of the U-bolt is 3-1/8 inches wide by 3 inches long.
    view full answer...
  • What is the Internal Width of Square Trailer U-Bolts # SP01-160
    I went out to the warehouse and measured the internal width of Square Trailer U-Bolts # SP01-160. They are 2-1/8 inches wide on the inside. They are designed for a 2 inch square axle using 1-3/4 inch to 2 inch wide springs.
    view full answer...
  • Using Nylon Lock Nuts On 2 Inch Square Trailer U-Bolt SP01-160
    For the 2 inch Square Trailer U-Bolt, part # SP01-160 you purchased, you can use nylon lock nuts that would work for a 9/16 bolt.You would want to make sure you use nuts of equal strength and that they match the thread and size.
    view full answer...
  • Recommended Torque Specifications for U-Bolt # SP01-160 in a Slipper Springs Trailer Setup
    Since the # SP01-160 u-bolts are 9/16 inches in diameter the torque rating is from 65 ft/lbs - 95 ft/lbs. I have linked a Help Article on Slipper Spring Trailer Suspension System Review to this page that lines out the torque ratings of the different diameter u-bolts for you to check out. I linked all the parts you mentioned to this page for your purchasing convenience.
    view full answer...
  • Leaf Springs, Hanger Kit, and U-Bolts for a 2 Inch Square Trailer Axle
    Since you do not know the capacity of the trailer axle then you can't go by the capacity of the springs. If the axle is rated for 2,000 pounds and the springs for a 3,500 pound axle then you would still be limited to 2,000 pounds. If you have the inner and outer bearing numbers then that will help to determine what the likely axle capacity is. Since you want to replace the hangers as well as the springs then it doesn't matter which springs you choose. If the axle does end up having...
    view full answer...
  • How to Pick Out Replacement Slipper Springs for a Boat Trailer with 2 inch Square Axles
    In order to pick out springs you need to remove the load on the trailer so that the leaf spring is not flattened out at all. You will want to measure from the center of the eye of the spring to the center of where the slipper spring contacts the hanger. If that distance is 26-1/4 inches and the capacity of the axle is 4,100 lbs the # SP-264275 would fit and work well. The bushing of this spring is 9/16 inch in diameter. You will want to use a 9/16 inch diameter bolt so you can either...
    view full answer...
  • Need a 3-Leaf Slipper Spring Kit for my Boat Trailer with 2 Inch Square Axles
    In order to determine which 3-leaf slipper springs will fit, you will need to take a few measurements of the current springs on your boat trailer. I am including a diagram that shows which measurements are needed. The diagram also includes the measurements of the two 3-leaf springs that we have available. Compare your measurements to those to see if we have a match. 3-Leaf Slipper Springs for 1,500 lb Trailer Axles, # SP-178275 3-Leaf Slipper Springs for 3,000 lb Trailer Axles, # SP-039275 Although...
    view full answer...
  • Replacement Leaf Springs, Equalizers, and Shackle Straps for a Magic Loader Boat Trailer 6K Axles
    There is not an exact size leaf spring, equalizer, and shackle strap length that must be used on your trailer but they do all have to be compatible with each other. That said, the measurements that you provided are fairly standard so I recommend using the Tandem-Axle Trailer Hanger Kit part # APT5 with the 5-Leaf Double-Eye Spring part # SP-111275 (4). The leaf spring hangers can be discarded but it will be more cost effective to obtain the kit. These components will have the right combination...
    view full answer...
  • Replacement U-Bolt Plate for a Trailer with 2 Inch Square Axle
    For a 2 inch square axle you are going to want u-bolt plate # TRTP200175. The hole spacing on center is 2-5/8 inches by 2-3/8 inches. For matching u-bolts go with # SP01-160. They have a 9/16 inch diameter. I have included a link to a video review for you for the u-bolts. It does sound like you will need to replace some existing components if they do not match up. I do not recommend modifying anything because that can weaken those items. Any welding should be performed by a qualified professiona...
    view full answer...
  • Are 5-3/4 Inch U-Bolts Long Enough for a 3 Inch Tall Axle and Slipper Spring # SP-040275
    The internal length of u-bolts # SP01-160 is 5-3/4 inches so you would not subtract 9/16 inches from that length. The u-bolt plate # 117594-G is 3/16 inches thick. The spring stack for # SP-040275 I just measured and it is 1-7/16 inches thick. Adding in the 3 inch height of the axle and the total comes to 4-5/8 inches. So all of these parts will fit your trailer axle.
    view full answer...
  • Replacement U-Bolt and Plate for Trailer with 2 Inch Square Axle
    For a 2 inch square axle you are going to want u-bolt plate # TRTP200175. The hole spacing on center is 2-5/8 inches by 2-3/8 inches. For matching u-bolts go with # SP01-160. They have a 9/16 inch diameter. I have included a link to a video review for you for the u-bolts.
    view full answer...
  • Replacement Leaf Springs and U-Bolts for a 1987 Shore Line Boat Trailer
    Thank you for submitting the photo of your setup. Considering the height of your axle and the amount of clearance you currently have from the axle to the frame of your trailer you wouldn't have enough room to put your axle above the leaf spring. You would barely have a couple of inches of suspension travel. For U-bolts you would want the part # SP01-160 and then for plates you would want the # 117594. Based on the dimensions of your current slipper springs the # SP-040275 that you...
    view full answer...
  • Thickness of 4 Leaf Slipper Spring for 2000 lb Axle Part # SP01-160
    The 4-Leaf Slipper Spring for 2,000-lb Trailer Axles is 1.04 inches thick at the thickest point. If you need some replacement U-Bolts, we offer them. The part # is SP01-160.
    view full answer...
  • Leaf Spring and U-Bolts Recommendation for a Utility Trailer with 2 inch Square Axles
    Sounds like you have 2 inch square axles on your trailer, for a set of U-bolt you would want part # SP01-160 and then for a U-bolt plate you would want the part # 117594. Now to pick out the correct springs you will want to first find out how much capacity your trailer and axles are rated for. This should be stamped on a plate near the coupler where the VIN is located. If it was a round axle I could give you a pretty good ball park of what the capacity would be, but square axles don't...
    view full answer...
  • How to Increase Ground Clearance with Slipper Springs.
    I can help you figure out how to get more ground clearance from your trailer. All of our over under kits have only been tested on a double-eye spring setup, these are secured on both ends unlike slipper springs which are not. I would worry that it could become unsafe since the weight of the trailer was pulling on the axle and once you switch the location of it all the weight will now be pushing down on the rectangular axle. While we don't have a specific over under kit for rectangular...
    view full answer...

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Info for this part was:

Expert Research:
Jackie C
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Jameson C
Expert Research:
Adam R
Expert Research:
Jeffrey L
Video Edited:
Joshua S
Updated by:
Adele M
Installed by:
Cole B

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