The Strike Piston 86715414 is the core rock-breaking component of the HC25 Hydraulic Rock Drill, operating at 1300-1500 impacts per minute. Generic pistons with surface hardness <HRC 50 typically wear out within 500-600 hours, losing impact efficiency. This OEM piston features a thick tungsten carbide coating (≥0.1mm) on its impact surface, achieving a hardness of HRC 55-60. This ensures that impact force  is limited to ≤5% over the 800-hour mandatory replacement cycle, maintaining consistent performance.