Parker Seal-Lok O-Ring Face Seal Tube Fittings and Adapters
Leak-Free, Vibration-Resistant Fittings for Demanding Fluid & Gas Applications, Including Hydrogen
Parker’s Seal-Lok ORFS fittings offer superior performance in high-pressure systems where safety, durability, and zero-leak integrity are critical. Featuring patented Trap-Seal® technology, Seal-Lok fittings prevent O-ring pinch and fall-out during assembly—making them ideal for high-integrity hydrogen gas and fluid handling connections.
- Zero-leak performance: Patented Trap-Seal design ensures seal retention and prevents damage during installation.
- Hydrogen-ready: With proven vibration resistance, zero clearance sealing, and high corrosion protection, Seal-Lok is an ideal choice for hydrogen transfer, refueling, and containment systems.
- High-pressure capability: Handles up to 63 MPa / 9200 psi, making it suitable for extreme operating conditions.
- Versatile installation: Compatible with inch and metric tube, hose, and port ends – no brazing or flaring needed.
- FastSeal option available: Enables quick, leak-free assembly with just a wrench—no special tools or prep required.
- Superior corrosion protection: Available in stainless steel and zinc-nickel plated steel (ToughShield Plus), tested for up to 3000 hours of salt spray resistance (ASTM B117).
- Torque-resistant: Withstands 200% torque above rated without failure – perfect for high-vibration applications.
Technical Specifications
| Attribute | Details |
| Shape | 45°, 90°, Straight, Cross, Tee |
| Max Pressure | 63 MPa (Dynamic) / 9200 psi |
| Connection Type | O-Ring Face Seal (ORFS) |
| Material Options | Steel, Zinc-Nickel (ToughShield Plus), Stainless Steel |
| Tube OD Range | 1/4″ to 2″ (6 mm to 50 mm) |
| Seal Material Options | 90 Durometer Nitrile, Fluorocarbon, 85 Durometer Hydrogenated Nitrile |
| Standards Met | SAE J1453, ISO 8434-3, ISO 6149 |
| Applications | Hydraulic fluid, hydrogen gas systems, and high-vibration environments |
Ideal for Hydrogen Systems
Parker’s Seal-Lok ORFS fittings are already used across critical hydrogen infrastructure due to:
- Leak-tight design – prevents hydrogen loss and potential hazard from gas leaks
- Cold-temp performance – compatible with extreme low temps used in hydrogen refueling (-40°C typical)
- No braze or weld required – reduces installation complexity and contamination risk
- Reusable and serviceable – ideal for modular systems or frequent maintenance intervals
- Hydrogen-compatible elastomers – including HNBR (Hydrogenated Nitrile) for added safety
Backed by Parker’s engineering and testing, Seal-Lok fittings are the trusted choice for clean energy transition projects across alternative fuels, mobility, and hydrogen storage.
Applications
- Hydrogen refueling systems
- Electrolyzer and fuel cell assemblies
- Pressure regulators and test panels
- General fluid and gas conveyance
- Mobile and industrial hydraulic systems