The Shank Stop 86796018 controls the reciprocating stroke of the drill shank in HC25 Hydraulic Rock Drills, preventing over-movement that could damage the shank or internal components. Generic shank stops use soft materials that wear quickly—within 1500-1800 hours—leading to increased stroke length and component collisions. This OEM shank stop is made from wear-resistant alloy steel (HRC 45-50) with a precision-machined stop surface (flatness ≤0.02mm/m) that ensures consistent stroke limitation. Its durable construction resists deformation, maintaining precise stroke control until wear or damage requires replacement.