Match the part number, measurements and connection points that apply to your trailer.
| Hub Face | Measure hub face to hub face. |
|---|---|
| Spring Center | Measure mounting centers and confirm perch configuration. |
| Capacity | Match the required axle rating. |
| Brakes | Confirm brake type and flange configuration. |
Part Number: SW4B
This is a single 4-leaf trailer leaf spring commonly used on 3,500 lb trailer axles. Each spring is rated at 1,750 lb capacity and is designed to be used as a pair on one axle. This is the most common leaf spring configuration found on 3,500 lb utility, cargo, and equipment trailers.
| Axle Rating | 3,500 lb axle (pair of springs) |
|---|---|
| Spring Capacity | 1,750 lb per spring |
| Number of Leaves | 4 |
| Spring Style | Double-eye leaf spring |
| Spring Width | 1.75" |
| Free Length (Eye to Eye) | 25.25" |
| Free Arch | 3" |
| Eye / Bushing Diameter | 9/16" (0.562" ID) |
| Part Number | SW4B |
This spring is intended for trailers originally equipped with 1.75" wide double-eye springs on a 3,500 lb axle. Length is measured eye-to-eye with the spring unloaded. Existing springs may measure slightly longer if stretched from age or use. Always confirm spring width, eye diameter, and unloaded length before ordering.
