QA1 27685-4M 27 Series Monotube Stock Mount Shock Absorber 5C/4R Linear Hyperscrew

The QA1 27685-4M is a 27 Series stock mount monotube shock absorber built for circle track racing applications including street stocks, hobby stocks, and mini stocks. Featuring a zinc-plated steel body and a 46mm hard anodized piston, this shock delivers consistent, tunable performance in a direct stock mount configuration.

Valved at 5 compression / 4 rebound (5C/4R) with linear valving, the 27685-4M uses QA1's Hyperscrew adjustment system. Linear valving provides a stable, predictable damping curve that gives the driver improved feel and feedback throughout a wide range of shaft speeds. The monotube design separates the gas charge from the oil, reducing aeration and maintaining consistent damping force lap after lap.

Key Features:

• Stock mount monotube design — direct bolt-in replacement for OEM-style mounting
• 46mm hard anodized piston for durability and consistent performance
• Zinc-plated steel body for corrosion resistance
• 5C/4R linear valving with Hyperscrew adjustability
• 13.35" compressed length / 22.55" extended length
• T-Bar and polyurethane bushing mount hardware included
• Racer revalveable and rebuildable for long service life
• 100% dyno tested and serialized at the factory
• Made in the USA

The 27 Series is popular across a wide range of sanctioned circle track classes that mandate stock mount shocks. For IMCA Southern Sport Mod legal applications, see the sealed 27A Series equivalent. QA1 part number 27685-4M.