QA1 10SM400 Chrome Silicon Coil Spring 1-7/8 in. ID 10 in. Free Length 400 lbs/in. Rate

The QA1 10SM400 is a high-performance chrome plated coil spring featuring a 1-7/8 inch inner diameter, 10 inch free length, and a 400 lbs/in. linear spring rate. Designed for coilover suspension applications in street rods, muscle cars, and performance builds, this spring delivers consistent, predictable handling whether on the track or the street.

QA1's 1-7/8 in. I.D. coil springs are manufactured from high-quality chrome silicon alloy spring wire — one of the strongest spring steels available — then cold wound, heat treated, and shot peened for maximum consistency, accuracy, and long-term durability. Both ends are precision ground flat to ensure straight, consistent, and accurate operation under load.

Key Features:

• 1-7/8 in. inner diameter (I.D.) coil spring
• 10 in. free length
• 400 lbs/in. linear spring rate
• Chrome silicon alloy spring wire construction for superior strength
• Cold wound, heat treated, and shot peened for consistency and durability
• Precision ground at both ends for straight, accurate operation
• Polished and chrome plated finish for premium appearance
• Free length and spring rate clearly marked for quick identification
• Lifetime guaranteed to remain within 5% of original free height under normal operating conditions

QA1 springs are available in a wide range of rates and lengths, making them a versatile choice for custom coilover builds. The chrome plated finish provides both corrosion resistance and a show-quality appearance. Each spring is individually marked with its length and rate for fast, error-free identification during installation or setup changes.