High-Tensile Bolt for Hydraulic Rock Drills This bolt is engineered to secure critical components in hydraulic rock drills, maintaining structural integrity under high vibration, pressure, and corrosive mining environments. Constructed from 10.9 grade high-tensile steel, it is designed for load-bearing applications like housing assemblies and gearbox covers—where bolt failure could cause costly downtime.
Key Performance Attributes
Material & Durability:
10.9 grade high-tensile steel offers a minimum yield strength of 1040 MPa (ISO 898-1) and resists fatigue, withstanding 10,000+ vibration cycles (ISO 16130) without loosening. It reduces shear failure risk by 40% compared to 8.8 grade bolts, suited for heavy-duty drill operations.
Zinc-nickel plating (10μm) provides 500+ hours of salt spray resistance (ASTM B117)—3x better than standard zinc plating—protecting against damp underground corrosion. The coating also improves thread lubricity for easier maintenance.
Precision & Compatibility:
Manufactured to DIN 933 standards, the M12×1.75 threads and 19mm hex head ensure compatibility with standard tools and rock drill components. The self-locking thread eliminates the need for extra washers, streamlining assembly.
Operational Reliability:
Rated for 85 Nm max torque, it balances secure fastening with installation safety, avoiding over-tightening damage. The -40°C to +120°C range ensures performance in extreme conditions, from arctic quarries to hot surface mines.
Applications
Fastens housing panels, gearbox covers, and structural brackets in hydraulic rock drills.
Compatible with tunneling machines, quarry drills, and exploration rigs needing high-tensile, corrosion-resistant fasteners.
