What Are the Torque Specs for Trailer Suspension Parts

Question

Question:

On the leaf spring suspension how tight should all the bolts be torgued to? Hanger, u bolts and others

asked by: Thomas B

1

Helpful Expert Reply:

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 - 95 ft/lbs, 5/8" bolts: 100 ft/lbs - 120 ft/lbs, 3/4" bolts: 140 ft/lbs - 160 ft/lbs
Eye Bolts: No Torque - Snug But Not Restrictive
Spindle Nut: No Torque - Hand Tight Plus Quarter Turn
Brake Flange Bolts: 45-50 Ft Lbs

I have attached a list of our torque wrench selection for you to look through as well.

expert reply by: Conner L

1

Answer 1

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 2

The closest size we have to a 25.5" slipper spring is 24-5/8". Do understand that this may be the correct size for your application since as leaf springs sag and get flatter they also get longer in length. Also the amount of leaves…

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Answer 3

If the shackles are flipping the wrong direction frequently that typically means the leaf springs are too short, the hanger spacing is too big, or the shackles are too short. Most of the time it's somebody changed leaf springs and just went…

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Answer 4

Torque specs for wheel lug nuts will vary depending on the diameter of the lugs, type of lug nut and the wheel's material. The linked chart details the recommended torque for many combinations. Dexter Hub/Drum #84546UC3 has 1/2-inch studs and…

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Answer 5

Hey Barrett, ideally you have 2 inches of clearance between the tire sidewall and the frame of the trailer. Where you are at now is going to be not quite enough clearance. We don't have any wheel spacers and honestly 1-1/2 inch wheel spacers…

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Answer 6

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 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

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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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

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 11

In order to replace the leaf springs on a trailer you'll need to choose ones that have the same unloaded length from eye to eye. If you go with a set slightly longer or shorter you'd then need to swap out the shackle straps as well to help…

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Answer 12

It is not uncommon for the shackle straps to flip once weight is lifted off the suspension but if they do so when you have a load bearing then this will not allow for proper load distribution or suspension travel. The cause of this issue is that the…

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What Are the Torque Specs for Trailer Suspension Parts

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