In HC20 Hydraulic Rock Drill (or Hydraulic Drifter) systems, the Cylinder 86677176 is the “power chamber core”—it holds the impact piston and high-pressure hydraulic oil, directly affecting the drill’s impact force and efficiency.

1. High strength: Heat-treated alloy steel (tensile strength ≥ 700 MPa) resists cracks and pressure deformation.
2. Smooth inner wall: Polished to Ra ≤ 0.4μm, ensuring friction-free piston movement and no oil leaks.
3. Precision: Coaxiality tolerance ±0.002mm, matching HC20’s piston perfectly to avoid misalignment.