Seal 86726668 | High-Pressure Resistance for Hydraulic Rock Drills
Montabert 86726668 – FKM (Viton) rubber | Dual-lip design | 7mm cross-section (ISO 3601-1)
Montabert 86726668 Seal for Hydraulic Rock Drills – FKM Material, 30MPa Pressure, -20°C to +200°C

Seal 86726668 | High-Pressure Resistance for Hydraulic Rock Drills

Part Number: 86726668
  • Technical Specifications:
    • Material: FKM (fluorocarbon rubber) compound (ASTM D1418)
    • Temperature Range: -20°C to +200°C (-4°F to +392°F)
    • Pressure Rating: 30MPa (4351 psi) maximum working pressure
    • Compliance: ISO 3601-1 (size & tolerance standards)
  • Design Features:
    • Cross-Section: 7mm (±0.05mm tolerance per ISO 3601-1)
    • Hardness: 70 Shore A (±5 Shore A)
    • Seal Type: Dual-lip with anti-extrusion backup
  • Performance Metrics:
    • Compression Set: ≤20% (after 70h at 200°C, ASTM D395)
    • Service Life: 6000 hours under rated conditions
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Heavy-Duty Seal for Hydraulic Rock Drills
This seal is engineered to prevent fluid leakage in high-pressure hydraulic systems of rock drills, withstanding extreme pressure surges, temperature fluctuations, and exposure to abrasive mining contaminants. Its robust FKM construction ensures reliable sealing performance in harsh drilling environments, reducing maintenance downtime and protecting critical components such as hydraulic cylinders and valves.

 

Key Technical Attributes

 

  • Material & Chemical Resistance:
    • FKM (fluorocarbon rubber) compound (ASTM D1418) offers exceptional resistance to mineral oils, hydraulic fluids (ISO 6743-4), diesel, and greases. Unlike standard NBR seals, it retains 96% of its elasticity after 1000 hours of immersion in aggressive mining fluids, making it suitable for long-term use in demanding conditions .
  • Pressure & Temperature Performance:
    • Rated for 30MPa maximum working pressure, it effectively seals hydraulic circuits during peak drilling loads. The -20°C to +200°C operating range ensures stability in both cold underground mines and high-friction hydraulic systems, where conventional rubber seals would degrade .
  • Precision & Durability:
    • 7mm cross-section with ±0.05mm tolerance (ISO 3601-1) ensures a tight fit in ISO 3601-3 grooves, minimizing wear and extending service life to 6000 hours under rated conditions. The dual-lip design with anti-extrusion backup prevents seal failure under high pressure, enhancing reliability .

 

Applications

 

  • Hydraulic Rock Drills: Seals hydraulic cylinders, valve bodies, and pump connections in R38 drill models.
  • Mining Equipment: Compatible with tunneling machines, quarry drills, and mineral exploration rigs requiring high-pressure sealing.

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