How to Determine Capacity of Square Axle

Question

Question:

I have a dual axle boat trailer with 2x2 square tube axles. How can I determine the weight rating so that I can order replacement leaf springs? There are no labels left on the trailer that states the rating. The tires are 205/75 R15 5 lug and the inner bearing # L44649, outer bearing # L68149.

asked by: Tim K

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Expert Reply:

Square axle capacities are pretty hard to determine. Unlike round axles, they do not have set capacities based on their dimensions.

Based on the bearings your hub looks like it's rated for 3,500 lbs. Most likely that would be the same rating as your axles.

expert reply by: Jameson C

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Answer 1

I have included a picture that shows the measurements needed for a spindle, bearings, seals, faces, and hubs. The spindle measurements are labeled A through F. A is the spindle shaft diameter B is where the grease seal sits C is where the inner…

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Answer 2

It is possible that the trailer tires that came with your trailer operated properly at 35 psi. When using any trailer tire, including the Kenda 205/65-10 Bias Trailer Tire #AM3H480 that you referenced, it is crucial to inflate it to the psi rating on…

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Answer 3

Typically what causes trailer tire failure is either overloading or exceeding the speed rating for the tire. It's unfortunate but most people aren't aware that the vast majority of trailer tires are only rated for 65 miles per hour. Exceeding…

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Answer 4

Square axles can be tough to determine capacity. Often times the same spindle fits a range of axle capacities. The best way to determine the capacity is to get the inner and outer bearing numbers stamped into the metal of the bearings like you did.…

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Answer 5

To replace a spindle, the old one would need to be cut off, and the new one welded into place. This is NOT a job for the do-it-yourselfer. The new spindle must be absolutely square with the axle in order to prevent premature tire wear and wheel…

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Answer 6

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 7

A BT8 spindle would have a diameter of .99 of an inch where the bearings would both install and would have a diameter of 1.24 where the great seal would ride. That would require a hub part #AKIHUB-440-2-1K for an idler hub. A BTR spindle would have…

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Answer 8

To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. If the old assembly has L44649 inner bearings, you would use the hub you chose #8-258-5UC1. If the inner bearings are marked…

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Answer 9

The 5.30-12 tires, being wider, are going to make more contact with the road. This means that the noise, and heat build up will be higher than a 4.80-12 tire but the rolling resistance will actually be less because the tire is larger diameter. The…

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Answer 10

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 11

The UFP H-1377 correlates to a Dexter #84 spindle, which is for a 3,500 pound axle. This will utilize an inner bearing #L68149 and an outer bearing #L44649. As this is being used on a boat trailer, I highly suggest going with the etrailer.com…

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Answer 12

Load range B trailer tires are going to have a lower capacity than C load range tires. Basically that, psi rating, and the ply rating are the only differences. A higher load range tire would last a little longer than lower load ranges of the same…

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How to Determine Capacity of Square Axle

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