Can Square Axle be Replaced With Round Axle & How to Find Right Axle

Updated 06/21/2023 | Published 06/20/2023

Products Featured in This Question

Trailer Axle with Idler Hubs - 5 on 4-1/2 Bolt Pattern - 89" Long - 3,500 lbs

(455)

$450.91

CE Smith U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts - Zinc

(1087)

$45.00

Question:

I have a boat trailer with square axles its a dual axle i need to replace one axle can i replace it with a round one? or do i need to change both axles

asked by: Dan

Expert Reply:

You can replace your square axle with round axles, but you would need to replace both axles instead of just one to ensure you have the same length axles, which will ensure your suspension and tires wear evenly and avoid problems.

In order to choose the correct replacement axle for your trailer you will need to know the dimensions of your current axle's hub face to hub face and spring center to spring center; I have added a link below to a video which walks you through how to measure. The other thing you need to know is the weight capacity of the axle you need, which should match or exceed the GVWR of your trailer.

For example, the Trailer Axle with Idler Hubs # e65GR has a 3,500 lb capacity and measures 89 inches from hub face to hub face and 74 inches from spring center to spring center. You will also need new U-bolts for your round axle, such as the U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles # CE23002.

I have added a link below to our entire selection of both axles and U-bolts for you.

expert reply by: Kyle S