High-Precision Parallel Pin for Hydraulic Rock Drills This parallel pin is engineered to provide precise positioning and torque transmission in hydraulic rock drill components, addressing the critical need for stable mechanical connections in high-vibration mining environments. Constructed from 45# alloy steel—known for its balanced strength and machinability—it is specifically designed for press-fit installation in shaft couplings, gear hubs, and rotating parts, where loose or inaccurate pins could cause equipment misalignment or failure.
Key Performance Attributes
Material & Durability:
45# alloy steel offers a tensile strength of 600 MPa (GB/T 699) and excellent wear resistance, maintaining structural integrity even after 5,000+ hours of continuous operation in drill rotating systems. The black oxide coating (5μm thickness) enhances corrosion resistance, withstanding 300+ hours of salt spray testing (ASTM B117)—suitable for damp underground mining conditions.
The solid circular cross-section eliminates weak points, reducing shear failure risk by 40% compared to hollow pins, making it ideal for load-bearing positioning applications.
Precision & Compatibility:
Manufactured to ISO 8734 standards with h6 diameter tolerance (±0.005mm) and ground surface finish (Ra 0.8μm), the pin ensures seamless press-fit compatibility with standard hydraulic rock drill shafts and hubs. This precision minimizes component misalignment, reducing vibration-induced wear on adjacent parts by 25%.
Operational Reliability:
The press-fit design provides permanent positioning without additional fasteners, simplifying assembly and maintenance. The -30°C to +110°C operating range ensures performance stability in extreme conditions—from cold mountain quarries to moderate-heat drill motor zones. It requires no periodic adjustment, supporting long-term equipment uptime.
Applications
Primary use: Positioning and torque transmission in hydraulic rock drill shaft couplings, gear hubs, and rotating mechanical components.
Compatible equipment: Tunneling machines, quarry drills, and mineral exploration rigs requiring high-precision mechanical fasteners.
