Spline Nut 86778529 | High-Torque for Hydraulic Rock Drills
Montabert 86778529 – 42CrMo4 steel | 28 splines (DIN 5480) | Induction-hardened (3-4mm depth)
Montabert 86778529 – IT7 tolerance (ISO 286-1) | M36x2 thread (ISO 7-1) | Ra 0.8μm surfac
Montabert 86778529 Spline Nut for Hydraulic Rock Drills – 42CrMo4 Alloy, 9000N·m Torque, HRC50-55
Montabert 86778529 – 9000N·m torque | 10⁶ cycles (ISO 12044) | 1200MPa tensile strength

Spline Nut 86778529 High-Torque for Hydraulic Rock Drills

Part Number: 86778529
  • Technical Specifications:
    • Material: 42CrMo4 alloy steel (EN 10083-3) with induction hardening
    • Hardness: HRC50-55 (surface); HRC30-35 (core)
    • Splines: 28 teeth (DIN 5480, module 3.0)
    • Tensile Strength: 1200MPa
  • Design Features:
    • Thread: M36x2 (ISO 7-1) with locknut compatibility
    • Surface Treatment: 8μm zinc plating (ASTM B633)
    • Torque Capacity: 9000N·m (continuous operation)
  • Performance Metrics:
    • Fatigue Life: 10⁶ cycles under rated load (ISO 12044)
    • Operating Temperature: -30°C to +100°C
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Heavy-Duty Spline Nut for Hydraulic Rock Drills
This spline 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 42CrMo4 alloy steel construction with induction hardening balances wear resistance (HRC50-55 surface) and impact absorption (HRC30-35 core), critical for reliability during continuous drilling.

 

Key Performance Attributes
  • Material & Durability:
    • 42CrMo4 alloy steel achieves 1200MPa tensile strength, making it suitable for 9000N·m continuous torque applications. The induction-hardened spline surfaces (3-4mm depth) resist wear, extending service life by 40% compared to standard machined nuts .
    • 8μm zinc plating (ASTM B633) provides 72-hour salt spray resistance (ASTM B117), protecting against corrosion in damp underground mines .
  • Precision & Compatibility:
    • 28 splines (DIN 5480, module 3.0) with IT7 dimensional tolerance (ISO 286-1) ensure seamless meshing with splined shafts, reducing backlash and wear during high-torque operation. The M36x2 threaded end (ISO 7-1) enables secure locking with standard locknuts .
    • Ra 0.8μm surface finish minimizes friction between mating components, maintaining torque transmission efficiency in high-vibration environments .
  • Operational Reliability:
    • Rated for 10⁶ fatigue cycles under rated load (ISO 12044), it handles repetitive rotational forces from rock drill impact mechanisms. The -30°C to +100°C operating range ensures stability in cold mines and high-friction systems .

 

Applications
  • Hydraulic Rock Drills: Integral to drive systems, connecting splined shafts to gearboxes and rotary mechanisms.
  • Mining Equipment: Compatible with tunnel boring machines, quarry drills, and exploration rigs using splined drive systems.

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