Ask anyone who’s ever lowered or lifted a truck and needed to compress a coil spring how nerve racking it can be. Truck coil springs are large and designed to hold the weight of a 4,500-5,500-pound ...

Take a steel rod, wrap it into a spiral shape, throw some engineered heat-treating in the mix, and you've got yourself a coil spring. That spring can be used as part of your suspension to support the ...