C/O Spring - 4.10 ID x 10 350# Silver P/C

The QA1 Coil-Over Spring – 4.10 ID x 10 in, 350 lb/in Silver Powder Coat is a high-rate coil spring engineered for suspension systems requiring precision spring rates and compact packaging. Built by QA1, a recognized manufacturer of performance suspension components, this coil-over spring delivers the stiffness and reliability demanded in competition, street performance, and heavy-duty applications where vertical load control is critical.

With a 350 lb/in spring rate, this spring resists compression firmly, making it ideal for vehicles carrying heavy payloads or requiring minimal suspension travel during cornering and acceleration. The 4.10-inch inner diameter accommodates standard coil-over shock bodies, while the 10-inch free length positions this spring in mid-range compression applications. The single pigtail design ensures consistent seating and eliminates binding. Steel construction with durable silver powder-coat finish provides corrosion resistance across salt-spray environments and extended storage. The 5.85 lb weight reflects the robust material gauge required for this load rating.

This spring suits off-road suspension builds, truck lift kits, performance street cars, and any vehicle needing a stiffer spring without resorting to custom ordering. Users upgrading suspension geometry or reducing body roll will benefit from the 350 lb/in rate, which pairs effectively with adjustable dampers to fine-tune ride quality. The silver powder coat resists UV degradation and road salt better than bare steel, extending the spring's lifespan in harsh conditions.

Coil-over springs are industry-standard components in suspension tuning. The 350 lb/in specification positions this spring in the mid-to-stiff range, suitable for vehicles between 2,500 and 4,500 lbs where aggressive handling geometry is desired. Proper installation requires matching the spring to an appropriate damper and confirming ride height geometry to avoid binding or unwanted preload.