Bolt 86321729 | High-Strength Alloy Steel Bolt for Hydraulic Rock Drills
Bolt 86321729 | High-Strength Alloy Steel Bolt for Hydraulic Rock Drills - Image 2
Bolt 86321729 | High-Strength Alloy Steel Bolt for Hydraulic Rock Drills - Image 3

Bolt 86321729 | High-Strength Alloy Steel Bolt for Hydraulic Rock Drills

Part Number: 86321729
  • Material: Quenched & tempered 4340 alloy steel (SNCM439 equivalent) with 1040 MPa tensile strength
  • Dimensions:
    • Thread Size:
    • Length:
    • Weight:
  • Performance Ratings:
    • Temperature Range: -40°C to +120°C
    • Maximum Working Pressure: 30 MPa
  • Compliance: ISO 898-1 Class 10.9 (high-strength structural steel standard)
  • Compatibility: Direct fit for hydraulic rock drills requiring M16 x 50 mm bolt assemblies
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High-Strength Alloy Steel Bolt for Hydraulic Rock Drills
Engineered for extreme underground mining conditions, this bolt ensures reliable performance in high-vibration hydraulic rock drill applications. Constructed from 4340 quenched & tempered alloy steel with 1040 MPa tensile strength, it withstands continuous dynamic loads while resisting abrasion and corrosion in harsh environments .

 

Technical Specifications & Design
The bolt features an M16 x 2.0 mm thread and 50 mm length, adhering to ISO 4014 Class A dimensional tolerances for precision fit in hydraulic cylinder assemblies and drill rig components. Its hot-dip galvanized coating (54 μm thickness) passes 500+ hours of salt spray testing (ISO 9227 standard), ensuring long-term performance in wet or corrosive mining environments . The recommended installation torque of 480 N·m simplifies assembly and reduces downtime .

 

Performance Advantages
  • Vibration Resistance: Engineered to maintain dimensional stability in high-frequency oscillating systems, minimizing wear in critical hydraulic connections.
  • Corrosion Protection: Hot-dip galvanized coating exceeds industry standards, extending service life by 40% compared to standard electroplated coatings .
  • Precision Fit: Dimensions adhere to ISO 4014 Class A tolerances, ensuring compatibility with standard hydraulic system components.
  • Ease of Installation: Clear torque specification streamlines maintenance processes.

 

Applications
  • Underground Mining: Critical for securing hydraulic connections in rock drills used in tunnel boring and ore extraction.
  • Heavy Machinery: Used in excavators and loaders to fasten high-pressure hydraulic lines and pivot points.
  • Industrial Hydraulics: Supports presses and material handling equipment, ensuring structural integrity in repetitive motion tasks.

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