Torque Spec For Leaf Spring Shackle Bolts

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Question:

What is the Torque Requirement for 9/16inch shackle bolts

asked by: Tim

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Expert Reply:

There is no specific torque rating for shackle bolts. You'll want to ensure that the bolts you use are long enough so that when installed you will have at least 2 threads protruding from the nut. Make sure that the bolt you're using has a lock nut, like part # 166081. If the bolt you are using has knurls at the bolt head, tighten the bolt down until the knurls go through the shackle link or hanger and the bolt head is flush. Then back off the nut slightly so that all of the components are pulled together but not so tight they cannot move.

expert reply by: Mike L

0

Answer 1

There should be enough free play in the shackles to allow them to move. There is no specific torque rating for shackle 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…

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Answer 2

If there is a tiny bit of play in suspension components that are designed to move you would be fine. 1/16 of an inch isn't very much, and as long as you torqued everything down to spec you would be good to go. Ideally we just don't want it…

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Answer 3

Hey Dustin, thanks for reaching out! You'll need the MORryde ALLTREK 4000 #MR89DR if you have a 33" wheelbase, or the kit #MR29DR if you have a 35" wheelbase. The wheelbase is measured from the center of the front wheel to the center of…

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Answer 4

The common recommendation with oil bath hubs is to not mess with them at all as long as they aren't leaking or the oil isn't milky looking. Some say to change every two years but most will say that as long as everything looks good just leave…

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Answer 5

Hey Aidan, a small amount of play is fine in your leaf springs. If the springs are sagging significantly then that could indicate that your springs are worn or there may be other suspension problems. If you notice any of that, then you are going to…

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Answer 6

You will need the U-Bolt Kit item #APUBR-1 to use the 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 27" Long item #SP-210275. The kit uses 1/2 inch diameter nuts that you will want to torque them down to about 70 foot pounds.

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Answer 7

I have attached for you below some common torque values needed for a trailer suspension system but a lot of these will vary by bolt size and other factors. U-Bolts: Varies by Size - 1/2" bolts: 45 ft/lbs - 70 ft/lbs, 9/16" bolts: 65 ft/lbs…

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Answer 8

The torque requirements for leaf spring u-bolts depend on the diameter of the u-bolts that are being used. If the gross weight of your tandem axle trailer is 7,000 lbs, then you likely have two 3,500 lb axles. Typically 1/2 inch diameter u-bolts are…

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Answer 9

Since wire color codes are NOT universal, we always recommend wiring by function, rather than wire color. If you look at the Trailer Wiring FAQ article I have linked you to, you can see some diagrams showing the proper way to wire a vehicle and…

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Answer 10

For 1/2 inch trailer u-bolts that attach to axle the recommended torque value is between 45 and 70 ft lbs of torque.

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Answer 11

The 6-Leaf Double-Eye Spring for 4,500-lb Trailer Axles - 26" Long #e27SR will be the closest fit for your 3750 lb axle. Having leaf springs rated slightly higher is normal because you will be limited in capacity by the weakest component on your…

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Answer 12

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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Torque Spec For Leaf Spring Shackle Bolts

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