QA1 27684-3M 27 Series Monotube Shock Hyperscrew T-Bar/Poly Bushing 4/3M Valving

The QA1 27684-3M is a 27 Series stock-mount monotube shock absorber built for circle track racing applications. Featuring a zinc-plated steel body and a 46mm hard-anodized piston, this shock delivers precise, consistent damping performance lap after lap.

This unit is equipped with a Hyperscrew nitrogen gas port, which uses a threaded port near the bearing end of the shock body sealed with an O-ring screw — allowing gas pressure to be adjusted or serviced as needed. The linear valving is set at 4 compression / 3 rebound (4-3M), providing a stable, predictable damping curve with full control at low shaft speeds without generating excessive forces at high shaft velocities.

Key Specifications:

• Series: 27 Series Stock-Mount Monotube
• Compressed Height: 14.30 inches
• Extended Height: 22.63 inches
• Stroke: 8.33 inches
• Top Mount: T-Bar
• Bottom Mount: Polyurethane Bushing
• Valving: 4 Compression / 3 Rebound (4-3M) Linear
• Piston Diameter: 46mm Hard-Anodized
• Body Finish: Zinc-Plated Steel
• Gas Port: Hyperscrew

Key Features:

• Racer revalveable and rebuildable for unparalleled repeatability
• 100% dyno tested and individually serialized at the factory
• Made in the USA at QA1's Lakeville, MN facility
• Linear damping curve for a consistent, predictable feel
• Shocks include polyurethane bushings

The QA1 27 Series monotube shock is engineered for competitors who demand reliable, repeatable performance. Whether you're setting up for heat races or fine-tuning for a feature event, the 27684-3M delivers the consistency and durability that QA1 racing shocks are known for.