High-Strength Alloy Steel Hexagon Head Bolt for Hydraulic Rock Drills Engineered for extreme underground mining conditions, this bolt ensures reliable fastening in high-vibration hydraulic rock drill applications. Constructed from 20MnTiB alloy steel (ISO 898-1 Class 10.9), it withstands continuous dynamic loads while resisting fatigue and corrosion in harsh environments .
Technical Specifications & Design The bolt features an M12 x 50 mm thread (ISO 4014) with a 1.75 mm pitch, designed for secure mounting in hydraulic cylinder assemblies and drill rig components. Its hexagonal head (18 mm width) provides optimal grip for torque application, while the zinc-plated coating with chromate conversion offers 120+ hours of salt spray resistance (ISO 9227) . The 20MnTiB alloy steel composition delivers a tensile strength of 1040 MPa and yield strength of 940 MPa, ensuring structural integrity under heavy impact loads .
Performance Advantages
Vibration Resistance: Engineered to maintain clamping force in high-frequency oscillating systems, reducing the risk of loosening during drilling operations.
Corrosion Protection: Zinc plating with chromate conversion meets ISO 9227 standards, extending service life in wet or corrosive mining environments.
Precision Fit: Thread dimensions adhere to ISO 4014 tolerances, ensuring compatibility with standard hydraulic system components.
Ease of Installation: Recommended torque rating of 60 N·m simplifies assembly and reduces the likelihood of over-tightening .
Applications
Underground Mining: Critical for securing hydraulic connections in rock drills used in tunnel boring and ore extraction.
Heavy Machinery: Used in excavators and loaders to fasten high-pressure hydraulic lines and structural components.
Industrial Equipment: Supports presses and material handling systems requiring reliable, high-strength fasteners.
