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

0

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

0

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Answer 1

In order to pick out the correct hub assembly for a trailer you are going to need know a few key pieces of information. The first thing you will need to know is the bolt pattern of your hubs. Since the figure you came up with doesn't match any of…

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Answer 2

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 3

Hi Charles! That's an interesting idea, but the TruRyde #84 E-Z Lube Spindle w/ Brake Flange for 3,500-lb Trailer Axles #TRU77FR does need to be welded onto the axle beam. The 4 bolt holes/plate on this spindle (and all spindles for that matter)…

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Answer 4

In order to verify the spindle dimensions so that you can pick out the correct hub/drum you have to get exact dimensions. For that you need to use a digital caliper like part #PTW80157. For how old your trailer is this is especially important as the…

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Answer 5

Yes, we do! For a 1-1/2" spindle you'll want the Square #84 Spindle for 3,500-lb Trailer Axles item #TRU47FR. This is designed for 3,500-lb trailer axles and measures 1-1/2" wide x 3-5/8" long. For a compatible 5 on 4-1/2 hub we…

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Answer 6

A true 1 inch spindle is a BT8 spindle, like #TRU94FR. The next closest one would be the BTR spindle which is commonly referred to as a 1-1/16 inch spindle, like #TRU44FR and is more common than the BT8. Both of these are typically used with 2,000 lb…

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Answer 7

Hey Jeff, thanks for the pictures! I found a break down of your axle online and yours is a a 3,500 lb axle, which uses a #84 spindle compatible with a #L68149 inner and an #L44649 outer bearing. Pretty sure you need the #84 E-Z Lube Spindle item…

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Answer 8

You will need to measure the diameter of the spindles where the seal and bearings ride. Check out the picture I attached that shows where this is. You will need an exact measurement so either a digital or dial caliper will be needed. To pick out the…

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Answer 9

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 10

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 11

Hey Bryan, that's a good question. The pricing can definitely be misleading, but I wouldn't use it to judge the quality of the tire. A lot of that comes down to promotions, inventory, and whether you're looking at a tire by itself or…

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Answer 12

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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How to Determine Capacity of Square Axle

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