The O’ring 86255700 is specifically engineered to seal pipe joint gaps in HC25 Hydraulic Rock Drills, a location prone to vibration-induced leakage. Generic O-rings lack elastic recovery capabilities, often deforming permanently within 500-600 hours of use. This OEM variant incorporates elastic recovery agents into its NBR rubber formulation, maintaining ≥85% elasticity retention over 800 hours. It also resists degradation from mine-specific contaminants like coal dust and mineral oil, ensuring long-term sealing performance.