Spring Conv Rear 12in x 5in 300lb

The SWIFT SPRINGS Spring Conv Rear 12in x 5in 300lb coil spring is a conventional helical spring engineered for suspension tuning, load support, and dynamic stabilization in heavy-duty applications. With a 300 lb/in spring rate and 12-inch length, this rear coil spring delivers predictable compression and extension characteristics across demanding operational environments. The 5-inch outer diameter and black powder-coat finish provide corrosion resistance and durability in field conditions.

The 300 lb/in rate indicates this spring requires 300 pounds of force to compress one inch—a specification critical for matching suspension geometry to vehicle weight, load distribution, and intended use. Conventional coil springs like this model are commonly integrated into rear suspension assemblies for trucks, trailers, recovery vehicles, and equipment platforms where consistent load-bearing performance is non-negotiable. The 12-inch length accommodates standard mounting dimensions found in medium to heavy-duty platforms, while the 5-inch coil diameter ensures compatibility with typical spring pockets and mounting hardware.

Buyers specify this rear coil spring replacement when OEM or aftermarket suspension requires precision rate matching—whether upgrading load capacity for auxiliary equipment, restoring worn suspension geometry, or fine-tuning ride characteristics for specific operational demands. The black powder-coat finish protects against salt air, moisture, and corrosive field environments. At 7.3 lbs, the spring's weight is consistent with its size class and rate specification, making installation and handling straightforward across professional and field applications.