Spring QM 5in x 1.63in ID 120lbs

The TANNER Spring QM 5in x 1.63in ID 120lbs coil spring is a precision-engineered suspension component designed for coil-over applications requiring a 120 lb/in spring rate. This spring combines proven steel construction with an orange powder coat finish, delivering both durability and corrosion resistance in demanding field environments. The 5-inch length and 1.63-inch inner diameter make it compatible with standard coil-over systems used in off-road vehicle builds, suspension tuning applications, and tactical equipment platforms.

Spring rate is the critical specification that determines how this component performs under load. At 120 lbs per inch, this spring compresses one inch for every 120 pounds of force applied—a medium-firm rate suitable for vehicles carrying moderate payload or for applications requiring controlled articulation without excessive drop. The steel construction ensures consistent performance across repeated compression cycles, while the orange powder coat protects against rust and UV degradation. The lightweight design at just 0.35 lbs minimizes unsprung weight, a key consideration in suspension tuning for both on-road handling and off-road performance.

This spring serves users building or upgrading coil-over suspension systems for light trucks, SUVs, and specialized tactical vehicles. Builders prioritize spring rate selection to match vehicle weight, intended use (patrol duty, rapid mobility, recovery operations), and terrain demands. The 120 lb/in rate occupies the middle range—stiffer than passenger-car springs but more compliant than heavy-duty rated springs, making it ideal for balanced builds requiring both comfort and control. Proper spring selection ensures suspension geometry remains within design parameters and prevents bottoming under dynamic loads.