The UNA051 is a heavy-duty, 4-leaf double-eye leaf spring designed specifically for trailer axles with a 4,000-lb (1,814 kg) capacity. It serves as the primary suspension component, providing support, stability, and shock absorption for utility trailers, equipment trailers, and other medium-duty applications. With a 26-inch length (center-to-center of the eyes), it offers a reliable and time-tested solution for load-bearing and ride quality.
| Category | Parameter | Specification | Notes / Explanation |
|---|---|---|---|
| Quantity & Capacity | Quantity | 1 leaf spring | This specification is for a single spring. |
| Spring Capacity | 2,000 lbs | The load rating for this single spring. | |
| Axle Capacity | 4,000 lbs | The total load rating for the axle, achieved by using two of these springs (one on each side). | |
| Dimensions | Length (Center to Center) | 26" | Measured from the center of one eye to the center of the other eye, unloaded. |
| Spring Width | 1-3/4" | The width of the leaf stack. | |
| Eye Diameter (with bushing) | 9/16" | The inner diameter of the eye after the bushing is installed. This is the size of the mounting bolt needed. | |
| Eye Diameter (without bushing) | 11/16" | The inner diameter of the metal eye itself, before bushing installation. | |
| Physical Attributes | Leaf Thickness | 3/8" | The thickness of each individual leaf. |
| Number of Leaves | 4 | This is a 4-leaf spring stack. |
