Disc Bypass 2 Notch 8mm ID

The BILSTEIN Disc Bypass 2 Notch 8mm ID shock valve (part number E4-B46-742A1) is a precision bypass valve component engineered for high-performance suspension tuning. This steel shock valve disc is designed to manage fluid bypass flow within damping circuits, allowing suspension engineers and builders to dial in precise pressure curves and response characteristics for competitive off-road, racing, and extreme-duty applications where standard valving cannot deliver the required control.

Measuring 1.44 inches in diameter with a 0.006-inch thickness and featuring a 0.035-inch bypass passage, this disc operates within tight tolerances critical to shock performance. The 8mm bore ID ensures compatibility with specific BILSTEIN shock architectures and mounting systems. The natural steel finish provides corrosion resistance suitable for most environments, while the precision-machined geometry allows controlled fluid flow across a defined pressure range. The two-notch design enables customized flow routing, allowing tuners to split bypass flows between different circuits or modify opening characteristics compared to single-notch configurations.

This component is essential for suspension specialists, shock rebuilders, and motorsports engineers working with BILSTEIN dampers who require component-level control over shock valving. Whether calibrating dampers for desert racing, rock crawling, high-speed off-road, or track applications, the correct bypass disc is fundamental to achieving the intended damping curve and vehicle dynamics. Direct replacement or OEM rebuild applications require exact specification matching—BILSTEIN part numbers and dimensions ensure proper fit and performance.

BILSTEIN's reputation in motorsports and extreme-duty suspension reflects decades of precision engineering. Shock valve components like this bypass disc must meet strict manufacturing tolerances; improper fit or specification can compromise damping performance and safety. Verify fitment against your shock assembly specifications and consult technical documentation before installation.