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Black forged steel merchant coupling, Class 300, half-inch FNPT

Anvil

Anvil 0320201031 Black Forged Steel Merchant Coupling Class 300 Trap

SKU CH-TSWP-SGK1H MPN 0320201031

Black forged steel merchant coupling rated Class 300 with FNPT connection handles 2000 psi at 150 °F and 300 psi saturated steam at 550 °F

  • TypeDrain Components
  • Forged steel construction resists deformation under 2000 psi working pressure
  • Class 300 rating handles saturated steam at 300 psi and 550 °F
  • FNPT threads enable direct pipe connection without extra adapters
  • ASTM A865 compliance confirms material quality for demanding installations
  • Operating range from -20 °F to 550 °F suits extreme temperature cycles

Class 300 Forged Steel Coupling

This 1/2-inch FNPT merchant coupling is forged from black steel to ASTM A865 and rated for Class 300 service. It connects two threaded pipes in plumbing and hydronic systems where a compact, high-strength joint is required. The fitting handles saturated steam up to 300 psi at 550 °F and liquid service up to 2000 psi at 150 °F.

Suits high-pressure steam and hydronic lines

Installers needing a durable, threaded joint for steam mains, condensate returns or hot-water loops will find the pressure and temperature ratings appropriate. It is not intended for weld-only piping systems, for applications requiring a union or flanged connection, or for services exceeding the stated pressure-temperature limits.

Pressure class and temperature envelope

The Class 300 rating combined with a -20 °F to 550 °F range is the decisive factor; confirm that your system design pressure and peak temperature fall within these limits before specifying this coupling.

Highlights

  • Forged steel construction resists deformation under 2000 psi working pressure
  • Class 300 rating handles saturated steam at 300 psi and 550 °F
  • FNPT threads enable direct pipe connection without extra adapters
  • ASTM A865 compliance confirms material quality for demanding installations
  • Operating range from -20 °F to 550 °F suits extreme temperature cycles

Specifications

TypeDrain Components
BrandAnvil
Model0320201031

Questions about this item

What does the 2000 psi rating mean when the coupling is installed in a piping system?

The coupling is rated for a maximum pressure of 2000 psi at 150 degrees F, so it can handle high-pressure fluid or gas lines within that limit.

Which standard governs the Class 300 designation and what does it cap in practice?

It meets ASTM Spec A865 for Class 300 forged steel fittings, which caps the saturated steam pressure at 300 psi at 550 degrees F.

What pipe size and thread type does this coupling need to connect properly?

It fits 1/2 inch pipe and uses FNPT (female national pipe taper) threads for a sealed connection.

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