Parker’s Seal-Lok O-Ring Face Seal offers a leak-free design and a rugged construction to make it optimal for use in situations with high-pressure, vibration and impulse environments.

Parker’s O-ring Face Seal (ORFS) Fittings and Adapters, Seal-Lok, meet or exceed the requirements of both SAE J1453 and ISO 8434-3 and have international acceptance. O-ring face seal fittings offer zero clearance, resistance to over torque and vibration resistance making it an ideal hydraulic fluid connection solutions across many markets.



  • Construction
  • Military Ground Systems
  • Aerial Lift
  • Agriculture
  • Material Handling
  • Military Marine
  • Machine Tool
  • Transportation
  • Alternative Energy
  • Off-Shore/Oil & Gas


  • Highly resistant to over-torque, withstanding 200% torque above the rated value without any damage to the fitting, creating unlimited reusability.
  • Flat sealing surface allows for zero clearance installation.
  • Suitable for a wide range of wall thicknesses and are adaptable to inch tube, metric tube and hose.
  • Patented Trap-Seal design provides optimal seal retention in ORFS CORG groove and prevents seal pinch during assembly.
  • Steel fittings substantially exceeded the SAE corrosion requirements of 72 hours without red rust, lasting up to 1,000 as found by an independent test facility.
  • Parker’s Robust Port Stud on adjustable ports is manufactured with a longer locknut virtually eliminating washer damage and potential leaks, as well as making assembly virtually mistake-proof.
  • Offered in steel and stainless steel in sizes 1/4″ through 2” with working pressures up to 9200 psi.


  • Hydraulic fluid and gas handling connections
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