Is the Stainless Steel Hose End for High-Pressure Gases, Left-Hand W21.8x1/14" DIN477, ZWW170 suitable for use with hydrogen at pressures above 200 bar?

Stainless Steel Hose End for High-Pressure Gases, Left-Hand W21.8x1/14" DIN477, ZWW170 — based on the provided description, this fitting is explicitly engineered for use with hydrogen and other combustible gases and is intended for high-pressure gas applications. It features a left-hand W21.8 x 1/14" Whitworth thread (DIN477), complies with PN-81/M-69229 (DIN477-1 no.1), and is constructed from corrosion-resistant AISI 304 stainless steel with a brass nut, indicating good mechanical durability and chemical compatibility for many gas-service conditions. However, the description does not specify a maximum working pressure or certifications for hydrogen service at pressures above 200 bar. Hydrogen at >200 bar imposes stringent requirements (leak-tightness, material hydrogen embrittlement resistance, validated pressure ratings, traceability, and often specific approvals/certification). AISI 304 stainless steel can be susceptible to hydrogen embrittlement under certain conditions and high pressures; suitability depends on detailed pressure ratings, test reports, and manufacturer validation for hydrogen at that pressure. Conclusion: The fitting is designed for hydrogen use, but you must obtain the manufacturer’s explicit maximum working pressure, hydrogen-specific certification/qualification, and test documentation proving safe operation above 200 bar before using Stainless Steel Hose End for High-Pressure Gases, Left-Hand W21.8x1/14" DIN477, ZWW170 at such pressures.

Can the Stainless Steel Hose End for High-Pressure Gases, Left-Hand W21.8x1/14" DIN477, ZWW170 be used with methane and other combustible gases in cryogenic conditions?

Yes. The Stainless Steel Hose End for High-Pressure Gases, Left-Hand W21.8x1/14" DIN477, ZWW170 is specified and engineered for use with hydrogen, methane and other combustible gases, and for high‑pressure gas applications. Its AISI 304 stainless steel body and precision brass nut provide corrosion resistance and mechanical durability. The fitting uses an internal Whitworth left‑hand thread W21.8 x 1/14" L and complies with PN‑81/M‑69229 (DIN477‑1 no.1), ensuring standard compatibility and secure assembly with appropriate mating components. However, cryogenic service introduces additional considerations: material toughness, thermal contraction, seal compatibility, and leak tightness at very low temperatures. AISI 304 and brass can be used at moderately low temperatures, but their suitability depends on the specific cryogenic temperature, the hose material, and the seal type. For safe cryogenic use with methane and other combustible gases you must verify: - Operating temperature range of the fitting, hose and seals for the intended cryogenic temperature; - Compatibility of the thermoplastic or rubber hose and any sealing elements at cryogenic temperatures; - Pressure ratings at low temperatures and thermal cycling effects; - Proper installation, left‑hand threaded mating parts, and leak‑test procedures for combustible gases. If you plan cryogenic application, consult the manufacturer’s temperature‑rating data and perform application‑specific verification or request cryogenic‑rated components/certification before use.

A fitting for hoses for gases high-pressure with a left-hand thread W21.8×1/14″ acc. to DIN477, steel stainless, type ZWW170

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A fitting for hoses for gases high-pressure with a left-hand thread W21.8x1/14" acc. to DIN477, steel stainless, type ZWW170

Additional information

Material	SS – stainless steel

A fitting for hoses thermoplastic and hydraulic rubber for gases high-pressure with a thread internal Whitworth W21.8 x 1/14″ L (thread left), Connection acc. to PN-81/M-69229 (DIN477-1 nr 1). purpose – m.in.: hydrogen, methane, other gases flammable. Material: Material: steel AISI 304 – A fitting, brass – A nut.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
TI-ZWW170-21L-04-SS-MO	End fitting GW W21.8 LH DIN477, for hose 1/4", AISI 304 (brass nut)	6	-	In stock	Enquiry
TI-ZWW170-21L-05-SS-MO	End fitting GW W21.8 LH DIN477, for hose 5/16", AISI 304 (brass nut)	8	-	In stock	Enquiry
TI-ZWW170-21L-06-SS-MO	End fitting GW W21.8 LH DIN477, for hose 3/8", AISI 304 (brass nut)	10	-	In stock	Enquiry

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A fitting for hoses thermoplastic and hydraulic rubber for gases high-pressure with a thread internal Whitworth W21.8 x 1/14″ L (thread left), Connection acc. to PN-81/M-69229 (DIN477-1 nr 1). purpose – m.in.: hydrogen, methane, other gases flammable. Material: Material: steel AISI 304 – A fitting, brass – A nut.