High-Strength Hinge Pin for Rock Drill Jumbos This heavy-duty hinge pin is engineered to deliver exceptional wear resistance and load-bearing capacity in extreme mining environments. Constructed from 42CrMo4 alloy steel with induction hardening treatment, it achieves 55-57HRC surface hardness and 5mm hardened layer depth, ensuring 10⁶ cycles of reliable operation under high-stress conditions.
Technical Specifications & Design
Material & Heat Treatment:
42CrMo4 alloy steel (EN 10083-3) provides 1200MPa tensile strength and excellent toughness, ideal for resisting impact loads in rock drilling applications.
Induction hardening process (3-3.5kHz frequency) creates a wear-resistant surface layer with 55-57HRC hardness, significantly extending service life compared to standard steel pins.
Precision Machining:
IT6 dimensional tolerance (ISO 286-1) ensures seamless fit with mating components, reducing vibration and noise during operation.
Ra 0.8μm surface finish minimizes friction and enhances lubricant retention, critical for maintaining smooth motion in abrasive environments.
Load & Environmental Performance:
80N/mm² specific load capacity supports continuous operation under heavy radial and axial forces.
Operates reliably from -20°C to +80°C with 95% humidity resistance, suitable for both underground mines and outdoor construction sites.
Applications
Rock Drill Jumbos: Powers hinge connections in drill feed systems, boom articulation joints, and telescopic arm mechanisms.
Mining Machinery: Compatible with loaders, crushers, and tunneling equipment requiring high-wear hinge pins.
Industrial Equipment: Ideal for heavy-duty drives in steel mills, quarries, and construction machinery.
