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Black forged steel pipe coupling, 1/4 inch FNPT, 3/4 inch outside diameter

Anvil

Anvil 1/4" Black Forged Steel Coupling 361155203

SKU CH-XNMH-KKM7T

Connects two 1/4-inch FNPT pipes with Class 3000 forged steel rated to 2000 psi at 150 °F

  • Rated for 2000 psi at 150°F working pressure
  • Handles saturated steam up to 300 psi at 550°F
  • Operates from -20°F to 550°F temperature range
  • Built to ASME B16.11 and ASTM A106 standards
  • Black forged steel with FNPT connection for durability

1/4" Black Forged Steel Coupling

This 1/4-inch coupling connects two female NPT threaded pipes in hydraulic or steam systems. The body is black forged steel built to Class 3000 dimensions and meets ASME B16.11 and ASTM A106 standards. It provides a permanent, leak-resistant joint for high-pressure piping.

Suits installers needing a Class 3000 socket-weld

The FNPT threads allow quick assembly without welding equipment, making it practical for maintenance crews and field repairs. It is not for applications that demand a welded joint or a pressure rating above 2000 psi at 150 degrees Fahrenheit.

Rated for 2000 psi at 150 degrees Fahrenheit

The coupling handles saturated steam up to 300 psi at 550 degrees Fahrenheit and operates continuously from minus 20 to 550 degrees Fahrenheit. Headroom disappears above the listed pressure-temperature curve, so systems running hotter or at higher pressure need a heavier class fitting.

Highlights

  • Rated for 2000 psi at 150°F working pressure
  • Handles saturated steam up to 300 psi at 550°F
  • Operates from -20°F to 550°F temperature range
  • Built to ASME B16.11 and ASTM A106 standards
  • Black forged steel with FNPT connection for durability

Specifications

BrandANVIL

Questions about this item

What pipe size and thread type must I already have for this 1/4" FNPT forged steel coupling to connect?

You need 1/4 inch pipe with male NPT threads; the coupling has female NPT threads on both ends per ASME B1.20.1.

How does the 300 psi saturated steam rating at 550 °F affect use with existing lower-pressure steam lines?

The coupling is rated for up to 300 psi saturated steam at 550 °F, so it will safely handle older steam lines operating at or below those limits.

How can I verify the coupling is sealing correctly after installation?

Pressurise the system up to 2000 psi at 150 °F and check for leaks at both threaded joints; no leakage confirms a proper seal.

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