How Are Trailer Leaf Springs Weight Capacities Rated

Question

Question:

When a leaf spring is rated at 3500 lbs. is that 3500 per pair or for each spring?

asked by: Vic

0

Expert Reply:

There is usually two capacities listed on a leaf spring. The spring capacity and the axle capacity.

For the 4-Leaf Double-Eye Spring # e54SR that you referenced it has a spring capacity of 1,750 lbs meaning that the individual spring can handle 1,750 lbs. The axle capacity is 3,500 lbs meaning that when you use two springs the combined capacity is 3,500 lbs.

I attached an FAQ article on trailer suspension for you to check out also.

expert reply by: Jameson C

0

Danny

5/16/2025

Hi just to clarify the spring rating. Am building a 2000 kg total capacity trailer - tandem axle Will 4 x 500 kg single leaf springs be fine ?? They will prob be Rocker set up Regards D

Reply

Jameson C.

5/19/2025

@Danny Yes they would. That would add up to enough capacity.

Reply

Answer 1

Thank you for providing all of that information! From the photos and dimensions it looks like you have the suspension kit that's equivalent to the Tandem-Axle Trailer Hanger Kit #APT5. For your axle and hanger spacing you need lead springs that…

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Answer 2

Thank you for providing the specs for the suspension components that you already have. Correct hanger spacing really depends on the components being used such as springs, hangers and equalizers. Most of the hanger spacing dimensions that we have are…

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Answer 3

We had a previous customer with your trailer give us their spindle dimensions which allows me to know what bearing kit you'd need. The correct kit is the part #BK2-100 which fits the very common 84 spindle that your trailer has. I attached an…

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Answer 4

Thanks for getting me all the info needed to pick out a hub! Based on what you listed the correct hub you need for a replacement is the part #84545BX. This uses the same bearings as what you have and has a matching bolt pattern.

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Answer 5

The #84 spindle is just a common way to identify the spindle dimensions typically used for 3,500 lb axles. So instead of listing out the parts, people can just say they have #84 spindles and it's easier to know what fits it. The CE Smith Trailer…

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Answer 6

There typically aren't any part numbers stamped onto the trailer spindle that can be used for identification. There are however numbers stamped onto the hub most times which can be used for identification. The TDE46210 tells me you have a 3,500…

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Answer 7

Leaf springs typically have the part #stamped on the strap that holds the leafs together at one end of the shorter leafs, or it is painted on the concave side of the springs. The part number can then be used to determine the capacity of the springs.…

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Answer 8

The diameter of your trailer axle will determine the size of the parts that you will need to order. If your axle is 3 inches diameter, the Dexter Trailer Springs Over-Under Conversion Kit, #K71-385-00, would be a great choice and if your axle is…

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Answer 9

In height or total diameter, a 185/80-13 and 175/80-13 like part #AM1ST77 only differ by about 5/8 of an inch. The 185 would have a diameter of 24.65 inches while the 175 would have a diameter of 24.02 inches. The section width, or thickness of the…

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Answer 10

If you can get me the overall length of your slipper springs and the axle capacity of your trailer I can help you pick out the correct replacement.

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Answer 11

Your math is correct in your trailer weight load example. If a fully-loaded tandem axle trailer weighs 4000-lbs then each of the 4 tires will bear 1/4th of that load, or 1000-lbs. In this case a tire rated for 1300-lbs would provide a good safety…

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Answer 12

Looks like you have slipper springs on your 2001 Coleman Utah pop up. We have replacement slipper springs available like the #e29SR which is 30 inches long and for 1,800 lb axles or the #SP-179275 which is 24-5/8 inches long and for 2,000 lb axles.…

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How Are Trailer Leaf Springs Weight Capacities Rated

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