Disc 28/40 8mm ID

The Disc 28/40 8mm ID is a precision shock valve component engineered for high-performance suspension systems requiring reliable pressure control and flow modulation. Manufactured by BILSTEIN, a leader in damping technology, this compact disc serves as a critical internal valve element in advanced shock absorber assemblies. It is designed for technicians, suspension specialists, and OEM applications where precise valve response directly impacts ride quality, handling stability, and durability under demanding conditions.

Constructed from high-grade steel in its natural finish, this shock valve disc measures 1.4 x 0.45 x 3.05 inches with an 8mm inner diameter bore and operates at 0.016 inch thickness for optimal stiffness-to-flexibility balance. The disc's design enables controlled oil bypass and pressure relief within the shock chamber, preventing excessive pressure spikes while maintaining consistent damping force across compression and extension strokes. Its compact 0.01 lb weight and precision engineering ensure minimal inertial delay and accurate response to suspension loading, critical for vehicles operating on varied terrain or in competitive environments.

This component is essential for suspension rebuilds, OEM shock servicing, and custom damper tuning applications. Technicians restoring or upgrading BILSTEIN shock systems will find this disc integral to maintaining factory performance specifications or tailoring damping curves for specific vehicle platforms. Proper installation within the shock valve stack requires clean assembly conditions and correct stacking orientation relative to complementary spring and shim elements. Direct OEM compatibility is confirmed through the BILSTEIN MPN E4-FE1-Z003B41, ensuring exact fit and performance validation for your suspension system.