Slipper Spring Hanger Positioning for 7,000 lb Tandem Axle

Question

Question:

I’m building a tandem with7k slipper spring axles . From eye to inside of slipper part is 26 3/4. How do I figure out location of hangers. I’ve never dealt with slipper springs before. I have a 12 inch equalizer.

asked by: Chris H

0

Expert Reply:

The spring hanger placement is going to be determined by your axle spacing. For example, if your axles are spaced 33 inches apart, as shown in the attached diagram, a 7K axle slipper spring, like # e74SR, requires a distance of 28-1/2 inches between the front and center hangers and 29-1/2 inches between the center and rear hangers, when using our Tandem-Axle Trailer Hanger Kit for 2" Slipper Springs with 12" Long Equalizers, # APT6SE.

I'm not sure exactly where you measured the 26-3/4 dimension of your spring, but I've also included a diagram to show you the typical slipper spring dimensions we take into account. For spring # e74SR, the "B" dimension of 22-3/4 inches is the distance required between the first hanger and the mounting point on the equalizer. The "C" dimension of 26-5/8 inches is the distance from the center of the eye to the end of the slipper.

I've attached our Axle Placement Help Article for you at the bottom of this page as well.

expert reply by: Carla M

0

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Manuel

11/14/2021

I’m building a triple axle trailer and I’m using some E 5115 7000# axles. My question is the dimension on my hangers. The distance apart of each hanger. Thanks

Reply

Les D.

11/18/2021

@Manuel First, you have to take a look at the article I have attached for you. The distance between hangers is dependant on your leaf spring length.Having a triple axle is just adding half again the parts from the tandem axle set up.

Helpful Links

faq-where-to-position-trailer-axle.aspx

Reply

Darryl

3/6/2024

I am confused with the hanger drawing. It shows dims that do not line up with the description. Dim c shows CL of hanger, yet description states dim between ubolts. Dim B shows distance between axles, but states distance between hangers?

Reply

Mike L.

3/7/2024

@Darryl That was a typo when the table was constructed, as well as a mislabeling. The diagram/table shown on the # APT6SE product page (see link) are correct. The dimension mentioned as 'distance between u-bolts' is the center to center distance between the axle centerlines.

Helpful Links

trailer-leaf-spring-suspension/etrailer/apt6se.html

Reply

Answer 1

Hey Daniel, Chances are your slipper spring has flattened out over time and is longer than it originally was. Typically an older trailer that may not have had its suspension replaced anytime recently is around an inch longer than it was originally.…

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Answer 2

Hey Donald. The Dexter 072-032-00 is a 26-1/2" long slipper spring, with a hook end, 5-leafs, that works with a 7,000 lbs axle. Our closest option to replacing this spring is the 5-Leaf Slipper Spring for 7,000-lb Trailer Axles - 26-1/2"…

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Answer 3

You can switch from a 5-Leaf #e74SR to a 7-Leaf #e37SR as long as you are replacing all your leaf springs. Do note the 7-leaf springs are going to be roughly 3/4" taller so you may also need taller U-Bolts like the #MR66ZR which are 7-3/4"…

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Answer 4

There isn't a complete kit, but I can go ahead and list out everything you need for a 12 inch long equalizer for 2 inch slipper springs, along with the mounting hardware and U-bolts for your 8,000 lb axles. Here is what you need for your tandem…

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Answer 5

For the Equalizer for 2 inch Wide Slipper Springs #TREQ1344 you will want to use a Wet Equalizer Bolt with Castle Nut and Grease Zerk #TRFA71063 for the center bolt hole. This bolt has a grease (zerk) fitting. For the side bolt hole that the spring…

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Answer 6

The bronze bushings and wet bolts are a great option but they still do require maintenance especially under the conditions you referenced. There really isn't any new information in comparing it is basically the difference between maintenance…

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Answer 7

Slipper spring setups, like parts #e74SR and #APT6SE for 7K axles, do have different hanger sizes so what you'll want to do is cut off the older hangers and do some mock-ups of your new system before installing the hangers. Start off by mocking…

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Answer 8

The 5-Leaf Slipper Spring w/ Hook End for 7,000-lb Trailer Axles #e74SR does appear to be the most likely to fit your suspension system. It is common for old springs to become wore out and sag. When they do this the overall length that you are…

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Answer 9

Hey Jeff, we have the Mini Clearance/Side Marker Light w/ Grommet - Submersible #TN96MR which is designed to fit a 1 inch diameter hole like you have. It is also red and 1 inch in diameter as well.

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Answer 10

The recommended lug nut torque for your 7,000lb axle depends on a few factors like wheel size, stud size etc. Check out the attached photo which shows the torque specs for a variety of applications. I see you were looking at the Dexter Nev-R-Adjust…

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Answer 11

If you want to make a side marker light blink with the turn signal it will have to be tapped into the turn signal/brake light wire for that side. But then it will also come on with the brake lights. And you would not want to also attach it to the…

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Answer 12

The LED Trailer Mini Clearance and Side Marker Light with Grommet #MCL10RKB is designed to install into a 3/4" hole. A Replacement Flush Mount Rubber Grommet #A11GB is available and I recommend getting as few of these as the original ones are…

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Slipper Spring Hanger Positioning for 7,000 lb Tandem Axle

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