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

Hello Lanny, thanks for reaching out. The CRE 3000 is already a pretty good suspension system, but if you want to upgrade, the first thing that comes to mind are the AllTrek 4000 equalizers. They have more rubber than the CRE 3000, 40% more, so you…

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Answer 2

The term, wet, in this case means that the head of the bolt has a grease Zerk in it and there is a channel that leads to center of the bolt. This makes it easy to grease the bolt while installed, as you can put a grease gun right up to the Zerk and…

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Answer 3

Hey, Lance. The direction the springs are in doesn't matter. They can be to the front or to the rear of the axle and will perform the same either way. What kind of trailer are you working on?

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Answer 4

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 5

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 6

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 7

Hello Daryl, The reason you’re having trouble locating a replacement is because Dexter does not offer a separate rubber bushing for the 13-143 equalizer, you’ll need to replace the entire unit. If the others are showing signs of wear as well, I…

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Answer 8

According to the Dexter Axle instructions, the bolts that are used to install the E-Z Flex Equalizer for 1-3/4" Double Eye Springs #013-144-03 should be torqued in the range of 30 - 50 ft-lbs (see attached cutout). Attached is an installation…

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Answer 9

Hi Mikolaj, We do have the correct replacement for the E-Z Flex equalizer marked 13-144, and what you need is the Replacement Equalizer for E-Z Flex Suspension Kits #013-144-03. It mentions "triple axle" on the product page but the…

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Answer 10

Hello Darrell, thanks for reaching out. The EQ-E1 equalizer is 7-3/4" long and 2-7/8" tall, and the Dexter E-Z Flex Equalizer #K71-655-00 is virtually identical in size so this will be a great option for an upgraded equalizer. As far as the…

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Answer 11

Let's start with the most important question you asked first...is it worth it to upgrade from the EZ Flex equalizers to the Road Armor. Honestly it's not going to give you a noticeable improvement so it would basically just be a waste of your…

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Answer 12

The torque specs for 9/16" diameter u-bolts like the U-Bolt Kit for Mounting 5,200-lb to 7,000-lb, Round Trailer Axles part #APUBR-9 will be a range, from 65 ft. lbs. to 95 ft. lbs. If the tie-plates start to bend inside this range that would be…

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What Are the Torque Specs for Trailer Suspension Parts

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