Tips for How to Identify a Trailer Axle

Question:

How can i find out the brand/make of my trailer axles? I have looked for a id tag and have found nothing.

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Expert Reply:

Depending on how the trailer was made, there will be a few spots you can check to identify the axle. First, if the trailer was pre-made by a specific company, you may be able to find this information in either the paperwork or on a placard somewhere on the frame.

Sometimes, the axle identity is stamped into the axle itself or into the hub if it was purchased as a complete assembly.

If you cannot find any markings or notation for the axle, you will need to look for replacement parts based on the capacity and dimensions of your existing parts. For example, if your trailer information shows that the maximum capacity of the trailer is 7000lbs, then you probably have two 3500lb axles. The bearings, races, and seals should have an industry standard number on the back edge which can be used to match replacements.

When looking for a wheel to fit your existing hubs, you can find out your existing bolt pattern by taking a simple bolt to bolt measurement. View information on measuring your bolt pattern at the provided link. The # AM20352 wheel you referenced will work for hubs with a 5 on 4-1/2 bolt pattern. With a capacity of 1870lb per wheel, these would be appropriate for a tandem axle trailer with a capacity around 3700lb when matched with similarly rated tires.

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Jameson C

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Follow up Questions

Travis L.

I have a boat trailer that the axel hub went bad and messed up the whole axel. Stamped on back of hub is 34231. The axel measuring 74 1/4 center spring hole. The total length from tip to tip is 90 1/4. Any help would be appreciated. Thanks 81711

Reply from Chris R.

We do have a few trailer axles available with a 74" spring seat length (linked below) but I wasn't able to find any info on the hub assemblies using the number you found. Is there any way you can tell me what inner and outer bearings are used inside the hub? There should be a number stamped right inside the bearings themselves. 67167

John

I have a home made trailer. The axle came from a mobile home. I would like to change it over to a 15” wheel with hubs. Is this possible. Thanks 76097

Reply from Chris R.

You'll likely need to replace the axle altogether but it should certainly be possible. I would need to know some specs on the existing axle though to recommend a good replacement (along with corresponding hubs and rims). Can you tell me its hub length and weight capacity? 62171

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