Heavy-Duty Bolt for Rock Drill Jumbos Designed to secure critical components in rock drill jumbos, this high-tensile bolt delivers reliable performance in harsh mining environments. Its 8.8 grade construction ensures robust fastening under high vibration and heavy loads, making it essential for drill arm assemblies, hydraulic mounts, and structural frames .
Technical Specifications & Design
Core Attributes:
High-Tensile Strength: 800MPa ultimate tensile strength (ISO 898-1) provides sufficient clamping force for heavy-duty applications, reducing the risk of loosening during operation .
Corrosion Resistance: Zinc plating with clear passivation offers 72-hour salt spray resistance (ASTM B117), protecting against moisture and mineral oils common in mining sites .
Temperature Resilience: Maintains mechanical properties from -30°C (underground mines) to +100°C (high-friction areas), ensuring stability in extreme conditions .
Performance Advantages
Secure Fastening:
Rolled threads enhance fatigue resistance by 20% compared to cut threads, extending service life in high-vibration environments .
Optimal torque range (25-30 N·m) prevents over-tightening, reducing the risk of thread damage or component distortion .
Ease of Integration:
Compatible with standard hex nuts, facilitating quick replacement and maintenance .
Chamfered end simplifies installation in tight spaces, a common challenge in drill jumbo assemblies .
Applications
Rock Drill Jumbos: Used in drill arm pivot points, hydraulic cylinder mounts, and structural frame connections.
Mining Equipment: Suitable for tunneling machines, blast hole drills, and heavy-duty loaders requiring durable fasteners.
Industrial Machinery: Ideal for construction equipment and material handlers operating in abrasive environments.
