This is a Trailer Leaf Spring Shackle made of Unfinished Steel that measures 4 3/8" long overall with 9/16" Leaf Spring Holes. This particular size has a 3 1/8" Center Hole to Center Hole spread. Spring shackles are the components that allow Double Eye Style Leaf springs to actually provide suspension.
On Single Axle trailers, you would see two of these shackles per side. They are mounted towards the rear of the leaf spring. As the spring compresses, these shackles will move backwards to provide the needed suspension for the trailer.
On Tandem Axle Trailers, you will have (4) of these shackles per side. They are mounted in the center on each side. These shackles attached to the Leaf Spring and equalizer bar (rocker bar) to provide suspension and equalization of weight while towing.
We have many lengths available, so measuring your current shackles will allow you to order the correct replacement. Changing the length of shackle used will affect the right height of your trailer.
On Single Axle Trailers, a longer leaf spring shackle will increase the ride height of the trailer, and a shorter will lower the ride height.
On a Tandem Axle Trailers, a longer leaf spring shackle will lower the ride height of the trailer, while a shorter shackle will increase the ride height.