High-Strength Hex Bolt for Rock Drill Jumbos This ISO 8.8 grade bolt is engineered to withstand extreme loads and harsh environments in rock drill jumbo applications. Its robust design ensures reliable performance in high-vibration, high-impact scenarios, reducing downtime and maintenance costs .
Technical Specifications & Design
Material & Construction:
Constructed from medium carbon steel (C45) with quenched & tempered heat treatment, achieving 22-32 HRC hardness for optimal strength and ductility .
85μm hot-dip galvanized coating (ASTM A153) provides superior corrosion resistance, passing 72-hour salt spray testing (ASTM B117) in simulated mining environments .
Thread & Fastening:
M6x1.0 metric thread with 6g tolerance ensures precise fit and 50N·m torque capacity, suitable for critical connections in drill arms and hydraulic systems .
Nylon insert locking feature prevents loosening under continuous vibration (10,000+ cycles tested per DIN 65151) .
Environmental Adaptability:
Operates reliably across -40°C to +120°C, making it suitable for both cold underground mines and high-temperature hydraulic components .
IP67-rated dust and water resistance protects against ingress of debris and moisture common in mining operations .
Performance Advantages
Extended Service Life:
Reduces corrosion-related failures by 40% compared to standard electroplated bolts, thanks to the sacrificial protection of hot-dip galvanizing .
Low friction coefficient (0.12-0.15) minimizes torque scatter during installation, ensuring consistent clamping force .
Safety Compliance:
Compliant with ISO 898-1 for mechanical properties and EN 1090-2 for structural integrity in heavy machinery .
Impact resistance of 20J at -20°C (ISO 148-1) ensures structural stability in dynamic loading conditions .
Applications
Rock Drill Jumbos: Ideal for securing drill arms, gearboxes, and hydraulic cylinders.
Mining Equipment: Compatible with loaders, excavators, and tunneling machines requiring high-strength fasteners.
Industrial Machinery: Suitable for crushers, conveyors, and material handling systems in abrasive environments.
