In HC20 Hydraulic Rock Drill (or Hydraulic Drifter) systems, the Upper flange 86668753 is a “critical upper structural connector”—it links the drill’s upper housing to components like the hydraulic valve block, while sealing hydraulic interfaces to prevent oil leakage. As a long-service-life part, its integrity directly affects the drill’s safety: a cracked or deformed flange can cause oil leaks (wasting 3-5 liters monthly) or component misalignment, leading to unplanned downtime.

1. Durability: Made of heat-treated alloy steel (tensile strength ≥ 650 MPa), it resists cracks and deformation for long-term use.
2. Precision: Bolt holes and sealing surfaces are machined to ±0.003mm tolerance, ensuring seamless assembly and no leaks.
3. Corrosion resistance: Zinc plating protects against damp underground or dusty surface environments.