How to Measure a Leaf Spring To Find the Correct Replacement on a Trailer Axle

Updated 04/27/2017 | Published 04/26/2017

Question:

I would like to replace the leaf springs on my trailer but Im having a hard time finding the right size. The length from eye to eye is 25inch 3/4. The current leaf instsalled is opened eyed and measures 26inch free length. What would best be recommended for my situation?

asked by: Leaf S

Expert Reply:

There a few more measurements that are needed off of your current leaf springs to guarantee that you will find the correct replacement leaf spring.

I have attach a diagram that will show the other measurements that are needed. You have the first measurement with the eye-to-eye distance. To find the correct replacement you will also need the spring height, measured from top of the center of the spring to the center of the eye. Also needed is the distance from the spring center to the center of the spring eye.

Axle weight capacity will also be need to pick the correct replacement leaf spring. Most axles will have this information listed in a tag that is attached to the axle.

We could also figure out what axle you may have by the diameter of the axle tube.

If the axle is 1 to 1-1/2 inches in diameter, it's likely a 1000 lbs axle
2-3/8 in diameter, 3500 lbs axle
3 inches in diameter, 6000-7200 lbs axle
3-1/2 inches, 8000 lbs axle
4 inches, 9000 lbs axle
5 or more, 10000 lbs axle