Coil Spring - 2.5in x 9 400#

The Coil Spring – 2.5in x 9 400# from QA1 is a high-travel coil spring designed for serious suspension builds on lifted trucks, custom off-road platforms, and performance-oriented vehicles. This spring is ideal for mechanics and fabricators who require precision-rate components that can handle extreme articulation and uneven terrain while maintaining ride quality.

Featuring a 2.5-inch diameter and a free length of 9 inches, this coil spring has a spring rate of 400 lbs/inch, providing the stiffness necessary to support additional loads and maintain consistent ride height under variable conditions. QA1's rigorous manufacturing standards ensure consistent coil pitch, proper heat treatment, and dimensional accuracy, which are critical to preventing premature fatigue and binding during full compression cycles.

This spring is particularly beneficial for vehicles that require enhanced suspension performance, such as those equipped with winches or bumpers. It is suitable for both independent and coil-over suspension applications, making it an excellent choice for custom installations where stock springs may not suffice.