What is the Torque Rating for 9/16 Inch Trailer Suspension Bolts

Question

Question:

I purchased new leaf springs, equaflex equalizer, u bolts, shackle straps, bolts, etc. for my tandem axle trailer. What is the torque lbs on the 9/16 wet bolts suggested for the equalizer and the straight bolts suggested for the spring eyes with never fail bushings

asked by: Curt

0

Expert Reply:

For 9/16 inch suspension bolts, wet bolts or regular bolts, you will want to torque them to 65 to 95 foot pounds.

And should you ever use 1/2 inch bolts then the torque spec is 45 to 70 foot pounds. And for 5/8 inch use 100 to 120 foot pounds.

expert reply by: Michael H

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Answer 1

Yes, you could use leaf springs for a 4,000 lb axle, like part #e57SR (rated for 2,000 lbs each), with a 3,500 lb axle but it will make your ride a bit more stiff. The only times that a leaf spring would become damaged is if it is overloaded or has a…

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Answer 2

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 3

If the U-bolts are 9/16 inch diameter, the torque specs should be between 65 to 95 foot lbs. If the U-bolts are 3/8 inch diameter, the torque should be between 30 and 50 foot lbs.

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Answer 4

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 5

According to the installation instructions from Dexter Axle the torque specs for the wet bolts on their Dexter E-Z Flex Suspension Kits, like part #K71-653-00, is 30 - 50 ft-lbs. I have attached a clip from their instructions for you to check out.

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Answer 6

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…

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Answer 7

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 8

For trailer axle u-bolts like the part #APUBR-10 the torque rating to use is between 45 and 75 ft lbs.

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Answer 9

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 10

The clip that you are talking about that is on your leaf spring, like part #e54SR, is called the rebound clip. It keeps the main leaf spring from breaking on a rebound. Typically the band is located on the front-most side of the trailer but it…

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Answer 11

Your best bet for upgrading the suspension on your trailer with 5,000 lb axles is to change out the springs from 1,750 lb capacity each to at least 2500 lb capacity each. Helper springs would not increase the capacity of your original suspension,…

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Answer 12

Thanks so much for that info, and to replace your current leaf springs that are 24 inches apart from center eye to center eye, you want springs that are slightly shorter because over time they flatten out. So for replacements I recommend 23-1/8"…

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What is the Torque Rating for 9/16 Inch Trailer Suspension Bolts

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