High-Strength Hex Head Screw for Hydraulic Rock Drills This hex head screw is engineered to secure critical components in hydraulic rock drills, providing reliable clamping force in high-vibration mining environments. Constructed from 8.8 grade high-tensile steel, it balances tensile strength (800MPa) with ductility, ensuring resistance to loosening under repetitive impact loads.
Key Performance Attributes
Material & Durability:
8.8 grade high-tensile steel (ISO 898-1) offers 800MPa tensile strength and 640MPa yield strength, supporting a 12kN clamping load—suitable for securing housings, brackets, and covers in drill assemblies .
8μm zinc plating (ASTM B633) provides 72-hour salt spray resistance (ASTM B117), protecting against corrosion in damp underground mines and reducing maintenance needs .
Design & Precision:
The hexagonal head (17mm across flats) allows secure torque application (45Nm recommended), while the serrated underhead creates a mechanical lock to resist vibration-induced loosening—reducing failure risk by 30% compared to smooth underhead screws .
M10x30mm threads (1.5mm pitch) with 6g fit ensure compatible mating with tapped holes, while IT8 tolerance guarantees consistent performance across production batches .
Operational Reliability:
Rated for 10,000 cycles under recommended torque, it maintains clamping force in extreme temperatures (-40°C to +120°C). The screw’s design simplifies installation with standard tools, supporting efficient on-site maintenance .
Applications
Hydraulic Rock Drills: Secures housing panels, bearing brackets, and fluid line clips.
Mining Equipment: Compatible with tunneling machines, quarry drills, and exploration rigs requiring high-strength fasteners.
