Bypass Disc 8ID 1 Notch

The Bypass Disc 8ID 1 Notch by BILSTEIN is a precision shock valve component engineered for performance suspension systems. This small but critical part regulates bypass flow within dampers, controlling how quickly hydraulic fluid moves through the shock absorber during compression and rebound cycles. Used in high-performance and off-road applications, the bypass disc ensures consistent damping behavior across varying suspension loads and speeds, making it essential for vehicles demanding refined ride quality and handling responsiveness.

Constructed from durable steel in a natural finish, the Bypass Disc 8ID 1 Notch features a 0.315-inch inner diameter and 1.437-inch outer diameter, with a thickness of 0.006 inches and a 0.011-inch bypass opening. The single notch design allows fluid to escape in a controlled manner, preventing shock lock-up and maintaining progressive damping characteristics. The compact 0.03-pound weight and minimal dimensions (2.65 x 0.4 x 3.1 inches) make installation straightforward within confined damper bodies. BILSTEIN's engineering ensures repeatability and longevity across thousands of suspension cycles, whether on street or track applications.

This valve disc is ideal for technicians, suspension specialists, and performance enthusiasts rebuilding or servicing BILSTEIN dampers. Original equipment specifications demand exact bypass disc geometry—any deviation alters suspension compliance and handling feel. Users should verify compatibility with their specific shock model and damper body before installation. Proper assembly requires attention to disc orientation and seating to avoid leakage or performance degradation. For vehicles equipped with BILSTEIN coilovers, air springs, or competition dampers, genuine replacement bypass discs maintain OEM performance standards and warranty compliance.