How to Determine Hanger Spacing on a Tandem-Axle Trailer Hanger Kit for Slipper Springs

Question

Question:

Hello, I just purchased Redline Trailer Suspension - AP216-H238 for a trailer Im repairing and had a few questions. Its a 1999, 6CAM16 Superline, tandem 7k axles with five leaf springs. The old hangers were already gone and I need to know if its 30 1/2inch from center to center of the new hangers? I see you answered a question similar to this on a 4K, four spring trailer, your tech said 30 1/2. I would like to see if my application is the same as well.

asked by: Garrett

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Expert Reply:

There isn't a specific distance the hangers have to be for hanger kit # AP216-H238. A good place to start is 30-1/2 inches on center but you would only really know by mocking it up on the trailer before permanently installing the hangers.

To determine where the center between the 2 axles should be, and then to work and add the hangers from there, you can follow the formula in the picture I have included. Once you know where the center between the 2 axles should be it would just be a matter of placing the hangers and other components in the proper positions.

expert reply by: Michael H

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Answer 1

The big things we are looking for on the label are the weight capacity, hub face (HF) length, and the spring center (SC) distance. Your axle is a 4,400 lb 85" HF and 68-1/2" CS Dexter axle. I will tell you up front that we do not carry a…

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Answer 2

To determine if there are compatible hubs and associated bearings to replace your current hubs to a more standard size you will have to take several precise measurements on the spindle of your axle. It is recommended to use a set of dial calipers to…

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Answer 3

The equalizer in the Tandem-Axle Trailer Equalizer Kit #AP216 is 11-1/2" on center from the outer spring mounting holes when measuring horizontal separation. One hole will be 6" on center from the equalizer mounting hole center and the…

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Answer 4

There isn't a set dimension for that on trailers. Typically axles are custom ordered to the specs needed. They order the spring seat to seat dimension for mounting to the trailer and then the hub face to face dimension for what will clear the…

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Answer 5

The only 7K axles we offer with straight spindles are the Dexter #8327834 axle you'd looked at and the same axle with brake drums/hubs, part #8327834-EB. These axles have a hub face to hub face distance of 95 inches and a spring seat center to…

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Answer 6

That does make sense. We don't have an exact replacement for your application but if you check out the Dexter Trailer Axle Beam with 4" Drop E-Z Lube Spindles #7685269 you can see that it has 95" hub-face and 80" spring-center…

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Answer 7

The reference to 4 leaf springs is the quantity of leaf springs the Tandem-Axle Trailer Hanger Kit, part #AP216-H238. Since it is for a tandem set up you would need to use 4 different leaf springs that are designed for axles up to 8,000 lbs…

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Answer 8

You're going to want at least 4" of space between your two tires on a tandem axle trailer. It sounds like you will need to move your spring hangers when you upgrade your axles to get the new ones farther away from each other. You can use the…

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Answer 9

The general consensus here at etrailer is that the minimum safe distance between tires on the same side of a tandem axle trailer is 4 inches. Technically speaking, you will need a minimum of 1 inch between the tires with the suspension in full flex…

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Answer 10

The difference in tire diameter will be an additional 2-1/2 inches going from the 225/75-15 which measure 28.4 to the 235/80-16 which measure 30.9 inches. As a general rule of thumb the minimum safe distance between front and rear tires on the same…

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Answer 11

I checked with Dexter, manufacturer of many trailer parts, and according to them there should be at least 1 inch of space between the tires when under load. So once your trailer is loaded and ready to tow, if you have more than 1 inch of space…

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Answer 12

The hanger spacing for a tandem axle trailer suspension setup can be determined, but you need to take into account the axle spacing needed for the overall diameter of your wheel and tire combination and the springs you will be using. Lets say that…

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How to Determine Hanger Spacing on a Tandem-Axle Trailer Hanger Kit for Slipper Springs

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