High-Precision Chrome-Molybdenum Steel Drill Sleeve for Hydraulic Rock Drills Engineered for extreme underground mining conditions, this drill sleeve ensures reliable performance in high-vibration hydraulic rock drill applications. Constructed from AISI 4145H chrome-molybdenum steel with 1080 MPa tensile strength and HRC 58-62 hardness, it withstands continuous dynamic loads while resisting abrasion and corrosion in harsh environments .
Technical Specifications & Design The sleeve features a 50 mm inner diameter, 75 mm outer diameter, and 120 mm length, adhering to ISO 1204:2016 P6 class dimensional tolerances for precision fit in hydraulic cylinder assemblies and drill rig components . Its zinc-nickel plated coating (12 μm thickness) passes 240+ hours of salt spray testing (ISO 9227 standard), ensuring long-term performance in wet or corrosive mining environments . The 2000 N axial load capacity and 80 N·m threaded connection torque make it suitable for heavy-duty hydraulic systems .
Performance Advantages
Vibration Resistance: Engineered to maintain dimensional stability in high-frequency oscillating systems, minimizing wear in critical hydraulic connections.
Corrosion Protection: Zinc-nickel plating exceeds industry standards, extending service life by 30% compared to standard electroplated coatings .
Precision Fit: Dimensions adhere to ISO 1204:2016 P6 class tolerances, ensuring compatibility with standard hydraulic system components.
Ease of Installation: Clear torque specifications streamline maintenance processes.
Applications
Underground Mining: Critical for supporting drill rods in rock drills used in tunnel boring and ore extraction.
Heavy Machinery: Used in excavators and loaders to reduce friction in high-pressure hydraulic lines.
Industrial Hydraulics: Supports presses and material handling equipment, ensuring structural integrity in repetitive motion tasks.
