What 4 on 4 Bolt Pattern Axle with Trailer Hubs Do You Carry?  

Question:

Expert Reply:

Hi Murray,

We only carry two trailer axles that have a 4 on 4 bolt pattern, but neither matches your spring center measurement. You'll want to measure the hub face length to determine how long your current axle is. This is especially important because getting an axle that is too short or long will impact how close/far the tires are from the trailer. If they're too close the tires can rub the fenders and if they're too far it'll increase stress on the frame and affect how the trailer pulls/turns. You'll need to measure from the outer edge of the hub face (where your axle contacts the wheel and tire) to the outer edge of the opposite hub face. I've included a diagram of where that measurement needs to be taken and linked an article on all the measurements for identifying what axle you have.

Of the two 4 on 4 axles we have, the etrailer Trailer Axle with Idler Hubs - 4 on 4- 60" long part # e25GR is 60" long with a 48" spring center measurement. The other axle is the etrailer Trailer Axle with Idler Hubs - 4 on 3 - 72" long part # e62YR with a 58" spring center measurement. Even if the spring center measurements are different, if the length is correct, you can always cut off the spring centers and weld them back on at the spacing that you need. Also, the hubs don't come already installed on the axle, they will be separate from the axle in their own boxes as it's not possible to ship them attached to the axle.

What kind of trailer are you replacing the axle on?

expert reply by: Claire H

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Hub Face Measurement
(click to enlarge)