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Seal-Lok H2 / O-Lok H2 - High-Pressure Leak-Free O-Ring Face Seal Fittings
- Proven leak-free connection for critical hydrogen applications.
- Multiple O-ring compounds available to meet most H2 application demands
- Excellent vibration performance
- Tested in accordance with EC79 and HGV3.1
- Easy torque assembly and resistant to overtightening
- Multiple tube connection methods are available.
- Parker Parflange® tube forming technology makes fast, leak-free connections for Seal-Lok H2 / O-Lok H2. Equipment is available for purchase or rent.
- Tube end connections can also be created with brazing and welding.
Seal-Lok H2 (USA) and O-Lok H2 (Europe) O-ring Face Seal Fittings
- Seal-Lok H2 (USA) / O-Lok H2 (Europe) O-Ring Face Seal Fittings provide a proven leak-free connection specifically designed for critical hydrogen applications.
- Engineered to withstand high pressures, vibrations, and demanding operational conditions, these fittings ensure long-term reliability and safety.
- With multiple tube connection methods and Parker’s Parflange® tube forming technology, assembly is fast, repeatable, and resistant to overtightening.
- Available in both US (Seal-Lok H2) and European (O-Lok H2) versions, they meet global hydrogen standards, including EC79 and HGV3.1.
- Tested in accordance with HGV3.1 and EC79
- H2 compatible O-rings, including PU, EP, FKM, and HNBR
- 700 bar / 350 bar system pressure capability
- SAE and ISO O-ring boss port ends available
- Excellent resistance to vibration- induced connection damage and loosening
- Easy torque assembly with high repeatability and over torque toughness
- Flat face zero clearance connection provides tube routing and repair ease
- 316/316L construction
Key features
- Proven leak-free O-ring face seal design for hydrogen service.
- Multiple O-ring compounds (PU, EP, FKM, HNBR) to match diverse H2 application requirements.
- Excellent vibration performance to prevent loosening or damage.
- Easy torque assembly with high repeatability and overtightening resistance.
- Flat face zero clearance connection for easier tube routing and repair.
- Multiple tube connection methods: Parflange® forming, brazing, and welding.
- Equipment available for purchase or rent for tube forming.
Technical specifications
- Standards Compliance: EC79, HGV3.1
- Pressure Capability: 700 bar / 350 bar system pressure
- Materials: 316 / 316L stainless steel
- O-Ring Compatibility: PU, EP, FKM, HNBR
- Port End Options: SAE and ISO O-ring boss
- Design: Zero clearance, flat face connection
Application areas
- Hydrogen fuel systems
- High-pressure H2 distribution and storage
- Hydrogen-powered vehicles (compliant with EC79 & HGV3.1)
- Critical hydrogen processing and industrial applications
Contact us
- Parker Hannifin has the right seal fittings for you. Fill out the contact vendor form to contact the vendor.
| Brand | Parker Hannifin |
| Fuel | Hydrogen |
| Max Pressure (in bar) | 700 |
| Manufacturing Readiness (MRL) | 1 |
| Technology Readiness (TRL) | 1 |
| Max Ambient Temperature (in °C) | 85 |
| Min Ambient Temperature (in °C) | -55 |
Parker Hannifin
Parker Hannifin is a Fortune 250 global leader in motion and control technologies. For more than a century the company has been enabling engineering breakthroughs that lead to a better tomorrow. Parker is supporting the global decarbonisation efforts through a broad range of solutions, hydrogen-compatible components and systems enabling safe and efficient operation for a variety of applications.
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