What is Torque for 3,500 lb Axle U-Bolts

Question

Question:

Hi Boat trailer slipper leaf springs at 1750lb each , with 3500lb axle. What are the torque specs for the spring/axle U bolts for 7/16inch and 1/2 Thank you

asked by: DIRK

0

Expert Reply:

Hey Dirk, the correct torque spec for 3,500 lb axle u-bolts is 45 and 70 ft lbs. Are you replacing leaf springs?

expert reply by: Jameson C

0

Dirk

3/17/2025

Thats a pretty big spread in values , is there not a target like 65ftlbs ?

Jameson C.

3/17/2025

@Dirk Yeah it's goofy how big of a range it is. I think the lesson here is that it's not super exact and I wouldn't stress about it too much.

Answer 1

I sure can! To replace the bearings in your 2023 Grand Design with Dexter 7,000 lbs axles you will need the following parts: Inner Bearing - Replacement Trailer Hub Bearing item #25580 Outer Bearing - Replacement Trailer Hub Bearing item #14125A…

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Answer 2

That does make sense. We don't have an exact replacement for your application but if you check out the Dexter Trailer Axle Beam with 4" Drop E-Z Lube Spindles #7685269 you can see that it has 95" hub-face and 80" spring-center…

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Answer 3

You have a Lippert 3500 lb axle with 10 inch brake assemblies/hub drums. We can't order custom axles, but we do offer a Dexter #7359765-EB off-the-shelf axle that's very similar, the only difference is that the leaf spring seat center to…

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Answer 4

Hey Mike. We only have axles with 58" spring seats like the Trailer Axle with Idler Hubs item #e37YR. You can remove the spring seats and reinstall the Spring Seat for Typical 2,000-lb, Round Trailer Axles item #TRSS175 so they are a 1/4"…

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Answer 5

Hey Jerry, thanks for reaching out. I can help point you in the right direction, but the VIN doesn't do much good in this case because there isn't a universal database for trailers like there is for motor vehicles. Boat trailer manufacturers…

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Answer 6

I do have all of the components you will need to flip the axle on your tent trailer but there is not an all inclusive kit per se to do so. However, the kits are pretty basic as all they include are u-bolts, tie plates, and spring seats. For your…

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Answer 7

The replacement you would need for your trailer axle that measures out to be 72 inches from hub face to hub face and is 60-1/2 inches from spring center to spring center you will need is The Trailer Axle with Idler Hubs - 5 on 4-1/2 Bolt Pattern - 72…

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Answer 8

Hey John, thanks for the pictures an the information. To replace your 072-099-00 leaf spring you'll need the 26" Long 6-Leaf Double-Eye Spring for 4,500 lbs Trailer Axles item #e27SR. When you swap out your leaf springs, you'll also want…

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Answer 9

You may be able to use the Dexter Trailer Axle with Idler Hubs #20545I-ST-72-15 on your Ironton 5x8 trailer. This axle has as spring center to spring center measurement of 58" and a hub face to tub face of 72". You will need to have new…

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Answer 10

I did some research and found that the Erickson O-Track Cargo Control System like part #EM59133 is very similar to the L-Track systems you referenced. The Erickson O-Track is 18 inches long and includes 2 Spring-loaded O-ring clips and mounting…

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Answer 11

When replacing equalizer bolts and shackle bolts you will not use a specific torque rating for tightening the bolts. The first thing you should make sure of is that the bolts you use are long enough so that when installed you will have at least 2…

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Answer 12

For 3,500 pound axle U-bolt kits like the Redline #APUBR-1 that use 1/2 inch hex nuts you will want to torque them down somewhere between 45 and 70 foot pounds. I have attached a great article on trailer suspension that includes this info along with…

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What is Torque for 3,500 lb Axle U-Bolts

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