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One-inch malleable iron union with FNPT threads, dark metal finish

Value Brand

Value Brand 1" Malleable Iron Union Class 300 FNPT

SKU CH-J6N2-P01PG

Malleable iron union with FNPT threads rated for 600 psi at 150 °F and 300 psi saturated steam

  • Handles up to 600 psi at 150 °F
  • Rated for 300 psi saturated steam service
  • Operates from -20 °F to 450 °F
  • Malleable iron construction meets ASTM A197
  • Complies with ASME B16.39 standard

1-inch Class 300 malleable iron union

This union connects two sections of 1-inch FNPT-threaded pipe in commercial and industrial plumbing systems. Malleable iron construction meets ASME B16.39 and ASTM A197 standards for mechanical strength. It is suited for installers who need a serviceable joint rated for saturated steam and high-pressure water service.

Class 300 pressure rating at 150 °F

The fitting withstands 600 psi at 150 degrees Fahrenheit and 300 psi saturated steam pressure. This single rating determines whether the union matches the design pressure of the piping system. It is not for lines that exceed these limits or for applications requiring a higher class designation.

-20 °F to 450 °F operating range

Across this temperature span the malleable iron retains its rated pressure capacity without degradation. The joint remains tight through repeated thermal cycles typical of steam and hot-water distribution. It is not for cryogenic service below -20 °F or for sustained exposure above 450 °F.

Highlights

  • Handles up to 600 psi at 150 °F
  • Rated for 300 psi saturated steam service
  • Operates from -20 °F to 450 °F
  • Malleable iron construction meets ASTM A197
  • Complies with ASME B16.39 standard

Specifications

BrandZORO SELECT

Questions about this item

What does the 600 psi @ 150 °F rating mean for daily use?

The union is rated for 600 psi at 150 °F, so it handles typical hot-water and compressed-air lines at that temperature without exceeding its design limit.

How does the FNPT connection and Class 300 standard affect sealing?

The FNPT threads follow ASME B 16.39 and Class 300 dimensions, giving a tapered seal that holds up to 300 psi saturated steam and 600 psi water pressure when properly assembled.

What clearance and pipe size are needed to install this 1-inch union?

It fits 1-inch nominal pipe with FNPT threads; the malleable iron body meets ASTM A197 and operates from -20 °F to 450 °F, so standard 1-inch pipe wrenches and thread sealant are all that are required.

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