Bilstein B8 5125 Shock Absorber, Eye/Stem, 18.74 Collapsed, Zinc-Plated Monotube

The Bilstein B8 5125 is a high gas pressure monotube shock built specifically for custom suspension applications where a direct Bilstein fitment doesn't exist. With a 46mm piston diameter, 14mm shaft, and self-adjusting deflective disc valving, this shock delivers consistent, fade-free damping without the guesswork of manual adjustment. The zinc-plated finish protects against corrosion, and the stem/eye mount configuration with a 5/8-inch hourglass bushing gives custom builders a reliable, industry-standard interface to work with.

The numbers that matter here: 18.74-inch collapsed length, 30.91-inch extended length, and 12.17 inches of stroke travel. Compression is rated at 620 and rebound at 2495 (both at 52 m/s), giving you a clear picture of the valving bias before you ever spec this into a build. A black bellows boot is included.

We recommend this shock to builders running non-standard lifts, custom control arm setups, or any application where catalog fitments fall short. It comes backed by a limited 90-day warranty. If you're piecing together a custom suspension and need a proven monotube unit with real spec data to work from, the B8 5125 is a straightforward choice.