The Retainer Socket 86733243 plays a vital role in securing bearings within HC25 Hydraulic Rock Drills, ensuring they remain properly positioned for smooth rotation. Generic retainer sockets are often made from low-strength steel that wears rapidly—within 1500-1800 hours—leading to bearing misalignment and increased friction. This OEM socket is crafted from alloy steel heat-treated to HRC 40-45, providing excellent wear resistance with ≤0.02mm wear over long-term use. Its precision-machined inner bore (tolerance ±0.003mm) fits bearings perfectly, maintaining alignment and reducing rotational resistance until wear or deformation requires replacement.