FS4000-20 Buna-N NBR Face Seal O-Ring | 90 Durometer Hydraulic ORFS Seal

Product Description

The FS4000-20 Buna-N NBR Face Seal O-Ring is a precision sealing component designed for use with SAE O-Ring Face Seal (ORFS) hydraulic fittings and adapters. Manufactured from Buna-Nitrile (NBR) with a 90-durometer hardness, this O-ring provides superior fluid compatibility, reliable compression resistance, and controlled extrusion properties — all critical for demanding hydraulic systems.

Specifications

• Material: Buna-Nitrile (NBR), 90 Durometer
  
• Shape: O-Ring
  
• Nominal Size: 20
• Designed for compatibility with SAE ORFS (O-Ring Face Seal) hydraulic fittings

Features

• 90-durometer Buna-N material for long-term durability
  
• Excellent resistance to hydraulic and mineral oils
  
• Flat face seal design for leak-resistant connections
  
• Extrusion and compression set resistance for high-pressure systems
  
• Ideal for industrial and mobile hydraulic applications
  

Applications

• Sealing interfaces on ORFS adapters and connectors
  
• Hydraulic manifolds and hose assemblies
  
• High-pressure fluid power systems
  
• Pump and valve port sealing
  
• Heavy equipment hydraulic circuits
  

O-Ring Face Seal technology is widely accepted in hydraulic applications that require leak-resistant connections under high pressure. The FS4000-20 is sized for Nominal Size 20 ORFS fittings, making it suitable for larger hydraulic circuits found in industrial machinery, heavy equipment, and fluid power distribution systems.

Buna-N material exhibits excellent compatibility with petroleum-based oils, mineral oils, and many water-glycol solutions. The 90-durometer hardness promotes strong sealing characteristics while resisting deformation under cyclic loads, making this O-ring an ideal choice for service conditions where repetitive pressure changes and vibration are present.