QA1 12HT150 High Travel Coil-Over Spring 12in. 150lb/in. 2.5in. ID Silver

Vehicle Fitment

• Universal fit - compatible with any coil-over shock or suspension system using a 2.5 in. (63.5mm) inner diameter spring seat
• Commonly used with QA1 Proma Star and other coil-over shocks, custom suspension builds, drag racing, road course, and street performance applications

Fitment Notes

• Verify your coil-over shock's required spring I.D. (2.5 in.) and maximum spring length before ordering
• 12 in. free length - confirm your shock has adequate travel to use this spring length without over-extension or coil bind at full compression
• High travel design allows this spring to be compressed to coil bind without affecting spring rate or free height - ideal for applications requiring maximum suspension travel
• Sold individually - order the quantity needed for your application (typically two per axle)
• Available in additional lengths (7 in., 9 in., 10 in., 14 in., 16 in.) and spring rates - select the length and rate appropriate for your vehicle weight and suspension geometry

Features

• High-tensile chrome silicon alloy spring wire allows fewer coils and smaller wire diameter - reduces unsprung weight and improves suspension response versus standard spring wire
• Increased coil spacing provides greater suspension travel compared to conventional coil-over springs of the same length and rate
• Can be compressed to coil bind without affecting spring rate or free height - no permanent deformation under maximum compression
• Silver powder coated finish for corrosion protection and clean appearance
• Ground flat ends for straight, consistent, and accurate seating - eliminates side loading on the shock shaft
• Carefully heat-treated and post-processed for improved fatigue life under repeated compression cycles
• Made in the USA

Specifications

• Part Number: 12HT150
• Free Length: 12 in. (304.8mm)
• Spring Rate: 150 lb/in.
• Inner Diameter (I.D.): 2.5 in. (63.5mm)
• Wire Material: Chrome Silicon Alloy (high-tensile)
• End Treatment: Ground flat both ends
• Finish: Silver Powder Coat
• Quantity: Sold individually (1 spring)
• Country of Origin: USA

Included Components

• 1x QA1 12HT150 High Travel Coil-Over Spring

Product Description

The QA1 12HT150 is a 12 in. free length, 150 lb/in. high travel coil-over spring designed for performance street, drag, and road course applications requiring maximum suspension travel. Manufactured in the USA from high-tensile chrome silicon alloy spring wire, the high travel design spaces coils further apart than conventional springs - reducing unsprung weight, improving suspension response, and allowing compression to coil bind without affecting spring rate or free height. The 2.5 in. I.D. fits standard coil-over shock platforms including QA1's Proma Star series and most other aftermarket coil-over systems. Silver powder coated with ground flat ends for precise, consistent seating. Sold individually.

Verify coil-over I.D. compatibility (2.5 in. required) and available shock travel before selecting spring length and rate. Available in multiple lengths and rates to suit a wide range of vehicle weights and suspension geometries.