High-Precision Chrome Steel Needle Bearing for Hydraulic Rock Drills Engineered for extreme underground mining conditions, this needle bearing ensures smooth operation in high-vibration hydraulic rock drill applications. Constructed from high-carbon chromium steel (SUJ2), it withstands continuous dynamic loads up to 25 kN while resisting wear and fatigue in abrasive environments .
Technical Specifications & Design The bearing features a 40 mm inner diameter (ISO 15 tolerance) and ABEC-5 precision, minimizing radial runout to ≤0.005 mm for consistent performance. Its quenched & tempered finish (HRC 58-62) enhances surface hardness, reducing friction and extending service life by 30% compared to standard carbon steel bearings . The 72 mm outer diameter and 17 mm width are optimized for direct replacement in Sandvik UD391 hydraulic rock drills, ensuring seamless integration with existing systems .
Performance Advantages
Vibration Resistance: Double-lip seals (NBR material) protect against mineral oil ingress and contaminants, maintaining lubrication integrity under cyclic loading.
Temperature Stability: Operates reliably from -30°C to 180°C, suitable for both cold climates and high-heat drilling environments.
Longevity: SUJ2 material and ABEC-5 precision reduce wear by 20% compared to conventional bearings, minimizing downtime in critical mining operations.
Applications
Underground Mining: Essential for hydraulic rock drills in tunnel boring and ore extraction, where precision and durability are critical.
Heavy Machinery: Used in excavators and loaders to support high-speed rotating components during high-impact operations.
Industrial Hydraulics: Supports presses and material handling systems, ensuring precision in repetitive motion tasks.
