High-Strength Alloy Steel Hex Screw Engineered for extreme underground mining conditions, this hex screw ensures reliable fastening in high-vibration hydraulic rock drill applications. Constructed from quenched and tempered alloy steel (ISO 898-1 Grade 8.8), it withstands dynamic loads up to 800 MPa tensile strength while resisting fatigue failure in repetitive impact environments .
Technical Specifications & Design The screw features an M12 x 1.75 thread profile (ISO 724) and 50 mm overall length, designed for secure mounting in hydraulic cylinder assemblies and drill rig components. Its zinc-plated surface finish provides 1000+ hours of salt spray resistance, protecting against corrosion from mineral oils and moisture . The hexagonal head (18 mm across flats) allows precise torque application up to 250 N·m, ensuring leak-free connections in high-pressure systems (250 bar continuous operation) .
Performance Advantages
Vibration Resistance: Thread-locking compound pre-applied to prevent loosening under cyclic loading.
Temperature Stability: Operates reliably from -40°C to 150°C, suitable for both cold climates and high-heat drilling environments.
Longevity: Zinc plating reduces wear by 30% compared to plain steel, extending service life in abrasive mining conditions.
Applications
Underground Mining: Critical for securing hydraulic hoses, cylinders, and percussion mechanisms in tunnel boring and ore extraction equipment.
Heavy Machinery: Used in excavators and loaders to fasten structural components during high-impact operations.
Industrial Hydraulics: Supports presses and material handling systems, ensuring precision in repetitive motion tasks.
