Recommended U-Bolts And Plate For A 1-1/2" Wide Square Axle

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Question:

Hello, I need a ubolt kit to go with SP-210275 Springs. I have 1.5 square axles. The current square ubolts are 4.5 in length. I started to purchase 115983 and individual ubolts but wanted to know if you offer a kit instead. Thank you.

asked by: Roy B

0

Expert Reply:

Hey Roy,

The only U-bolt kit we currently only offer for 1-1/2" square axles is part # CE23102, which only has a 3-3/8" length so it likely wouldn't be the best option for you. Instead you'll want to order the 1-1/2" Square Trailer U-Bolts # SP01-120 and two of the U-Bolt Plate # 115983 to mount your axle to the leaf springs # SP-210275.

expert reply by: Kevin C

0

Roy

3/18/2024

Kevin, Thank you for your assistance. The order arrived over the weekend. This morning I tested to see how everything fits and the #SP01-120 U-Bolts are too narrow to freely slide through the bolt holes in the #115983 U-Bolt Plate or freely slide over the axle. They are not off by much but I'm concerned about damaging the threads if I use force to get them through the bolt holes and/or axle. Shouldn't the u-bolts freely slide through the plate and past the axle? Regards, Roy

Reply

Kevin C.

3/18/2024

@Roy In my experience they usually do give you a bit of a fight but there's obviously a limit to how much fight they should give you. I typically can get them to pop right through the hole in the U-Bolt Plate # 1158983 by getting one side of the bolt in and then prying just a bit with my hand on the other side to pop it into the other hole. The U-Bolts # SP01-120 slightly angle in to better encompass the axle tube so that's why they're fighting the plate.

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Roy

3/18/2024

@KevinC Thank you. I can get the U-Bolt into the plate in the manner suggested. My bigger concern is seating the axle in the U-Bolt. I have some clean-up and painting to do on the trailer before I install the suspension components so we'll see how it goes in a day or two. Thanks & Regards. - Roy

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Roy

3/21/2024

@KevinC - I didn't have any issues with fitment of the U-Bolts and U-Bolt plates when I installed them on the free axle today but I did run into what I perceive to be a problem with the SP-210275 "4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 27" Long" mating to the axle. There is an indent or hole approximately 1/8 " deep in the square axle. The nut on the bottom of the leaf spring is 2/8" thick with another 1/8" thread from the bolt for a total of 3/8" sticking out from the leaf spring. There were no additional brackets or components in the hardware (leaf springs, u-bolts and u-bolt plates) I removed so I'm not sure what next steps are to finish bolting up the axle to the leaf springs. Assistance would be appreciated. Thanks in advance. - Roy

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See All (6) Replies to Roy ∨

Answer 1

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…

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Answer 2

Hey Chris, The torque for the 3/8" diameter U-bolts of the CE Smith U-Bolt Kit for Mounting 1-1/2" Square Trailer Axles #CE23102 is 30 to 50 ft. lbs.

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Answer 3

The bearing part #L44649 has an inner diameter of 1.063 and is typically used in 3,500 lb axle hubs and the #L44643 has an inner diameter of 1 inch and is typically used on 2,000 lb axle hubs. If you can get me more info on your trailer like axle…

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Answer 4

For a slipper spring that would work well for your application you would want the part #e29SR. This is a 2k rated spring that is 30-1/4 inches long. This should be a much softer spring than what you have as it looks like your spring would be a higher…

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Answer 5

You can use leaf springs that are rated higher than the axle without any issues as long as they measure the correct measurement for your trailer. For example the 6-leaf double eye spring for 7,000 lb axles part #e64SR measures 24-7/8" eye to…

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Answer 6

I definitely recommend replacing your 3,500 lb 26 inch leaf springs with the 26 inch 4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles #e22YR. The 4,500 lb would be too stiff and your ride would suffer so the better option by far are the 4k…

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Answer 7

There is no specific torque rating for shackle bolts. Basically for the middle bolt there should be enough free play in the shackles to allow them to move. Tightening the shackle bolts too much will squeeze the shackle straps against the leaf springs…

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Answer 8

The 1-1/2" Square Trailer U-Bolts #SP01-120 is not galvanized and we don't have any in this size that are.

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Answer 9

If what you really need is a new axle you can go to a local trailer shop to you and have them custom order you the exact specs you need for a trailer axle. But to attach springs to your 1-1/2 inch square axle you would want the mount plate part…

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Answer 10

Regardless of the axle diameter, generally most modern double-eye springs are 1-3/4 inches wide. U-bolt plate #115983 works with u-bolts #SP01-120 which have a 1-1/2 inch width to fit around the axle. The u-bolt plate will set below the the leaf…

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Answer 11

If the center hole of your U-bolt plate isn't large enough for the nut on your leaf spring to fit flush you would want to drill it out large enough so that it will fit properly.

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Answer 12

The closest option we have is the part #SP01-120 which is U-bolt that is 1-1/2 inches wide, has a diameter of 1/2 inch, and has a length of 5 inches.

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Recommended U-Bolts And Plate For A 1-1/2" Wide Square Axle

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