Heavy-Duty Splined Nut for Hydraulic Rock Drills This splined nut is engineered to transmit high torque in hydraulic rock drill drive systems, ensuring secure power transfer between splined shafts and components in extreme mining environments. Its robust design withstands vibration, axial loads, and abrasive contaminants, critical for maintaining equipment reliability during drilling operations.
Technical Specifications & Design
Material & Durability:
Constructed from 42CrMo4 alloy steel, featuring induction-hardened spline surfaces (3-4mm depth) for HRC50-55 wear resistance and a tough core (HRC30-35) to absorb impact loads. This material achieves 1200MPa tensile strength, suitable for heavy-duty torque transmission .
8μm zinc plating (ASTM B633) provides corrosion protection, validated through 72-hour salt spray testing (ASTM B117) to withstand damp underground conditions .
Precision Engineering:
24 splines (DIN 5480, module 2.5) with IT7 dimensional tolerance (ISO 286-1) ensure seamless meshing with splined shafts, reducing backlash and wear during high-torque operation. The M30x1.5 threaded end (ISO 7-1) enables secure locking with standard locknuts .
Ra 0.8μm surface finish minimizes friction between mating components, extending service life by 30% compared to standard machined nuts .
Performance Under Load:
Rated for 8000N·m continuous torque, it handles the rotational forces generated by hydraulic rock drill impact mechanisms and rotary drives. The 10⁶ cycle fatigue life (ISO 12044) ensures durability in repetitive drilling cycles .
Operating temperature range (-30°C to +100°C) maintains performance stability in both cold underground mines and high-friction mechanical systems .
Applications
Hydraulic Rock Drills: Integral to drive systems, connecting splined shafts to gearboxes and impact mechanisms.
Mining Equipment: Compatible with tunneling machines, quarry drills, and mineral exploration rigs requiring high-torque splined connections.
Industrial Machinery: Suitable for crushers, conveyors, and heavy-duty material handling systems with splined drives.
