Round tube connector H2-M7A3

stainless steelscrew-in

Short description
Weld-on tube union for hydrogen applications, three-part design (weld-on stub, clamping nut, weld-on screw stub). Series H2-M7A3. Nominal diameter DN3; pressure rating up to PN700 (700 bar). Material: DIN EN 1.4404 (stainless steel). Welding nozzle outer diameter d1 = 6 mm; wall thickness s = 1.5 mm; screw-in thread d3 = M14x1.5; screw-in connector 6 mm. Successfully tested by TÜV SÜD in accordance with EC 79/2009 and EU 406/2010 (report 20454990-1-d).

Advantages & functions

• Weld-on ends on both sides for permanent, leak-minimised connections
• Designed for hydrogen service and high-pressure gas systems
• Available in DIN EN 1.4404 stainless steel for corrosion resistance
• Operating temperature range: -40 °C to +85 °C
• Pressure capability up to 700 bar (PN700)
• Three-part construction enables replaceable components and easy assembly

M7A Series (pressures up to PN 700) - Dimensions
DN | d1 | s | d3 | d12 | L1 | l1 | n2 | s1 | s3 | Order number
3 | 6 | 1.5 | M14x1.5 | 6 | 65 | 38 | 18 | 17 | 19 | H2-M7A3

Ordering information (individual parts)
Pieces | Component | Designation | Order number | Material number
1 | 1 | Weld-on stub | H2-M7A3-1 | —
1 | 2 | Clamping nut | H2-M7A3-2 | —
1 | 3 | Screw-in stub | H2-M7A3-3 | —

Technical data (table)

• Nominal pressure: 700 bar (PN700)
• Nominal diameter: DN3
• Welding nozzle outer diameter (d1): 6 mm
• Wall thickness (s): 1.5 mm
• Screw-in thread (d3): M14x1.5
• Screw-in threaded connector: 6 mm
• L1: 65 mm
• l1: 38 mm
• n2: 18 mm
• Wrench sizes: s1 = 17, s3 = 19
• Material (DIN EN): 1.4404 (stainless steel)
• Temperature range: -40 °C to +85 °C
• Construction: three-part union (weld-on stub, clamping nut, weld-on screw stub)
• Test: TÜV SÜD report 20454990-1-d (EC 79/2009 and EU 406/2010)