Short answer
In hydrogen applications, hose and connection selection requires a dedicated technical assessment. Gas permeation, material behavior, pressure and cycling conditions must be examined together; general knowledge about hydraulic hoses or stainless fittings is not sufficient for safe selection.
Technical explanation
Swagelok discusses the risk of hydrogen embrittlement, which can adversely affect the mechanical behavior of some metals. This effect depends on the material and the operating conditions; no conclusion such as ‘all metals are unsuitable’ or ‘every stainless steel is suitable’ can be drawn. For hoses, permeation and the leak tightness of the entire assembly are also subjects of assessment. This guide does not provide a fueling system design, a pressure class or a list of usable materials.
Topic-specific checkpoints
| Item | Description |
|---|---|
| Fluid | Gas/liquid state and purity |
| Load | Pressure, temperature and cycling |
| Material | Specific evidence for use with hydrogen |
| System | Assembly and facility safety assessment |
How to evaluate it in practice
For the expert assessment, define the state and purity of the hydrogen, the pressure/temperature range, cycling, movement and the installation environment. Ask the manufacturer for written confirmation of suitability for the full product code and use scenario. Do not assume that the separate documents of the components cover the final assembly. Topics such as process safety, leak detection and ventilation are part of the facility design; do not size them from a general hose guide. Products of uncertain suitability must not be released for use merely on the grounds of a trial.
Original editorial recommendation; not a clause of a standard.
Frequently asked questions
Does the name 316 stainless guarantee hydrogen suitability?
No. Specific verification is required for the material properties, the product design and the actual conditions.
Source coverage
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S017
Parker Safety Guide, Publication 4400-B.1 Parker Hannifin · accessed 2026-10-20 PDF page 2; 2.5 Fluid CompatibilityPDF page 3; 3.1 Component Inspection, 3.2 Hose and Fitting Assembly and 3.3 Related Accessories | PDF page 2; 2.6 PermeationPDF page 2; 2.2 Pressure | PDF page 2; 2.5 Fluid Compatibility
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S051
Hydrogen embrittlement: material selection guidance Swagelok · accessed 2026-10-19 Hydrogen embrittlement and component/material selection