1/2 inch x 3/8 inch Black Iron Reducing Coupling Female x Female

1/2 inch x 3/8 inch Black Malleable Iron Reducing Coupling – Threaded FPT x FPT

The 1/2 inch x 3/8 inch black malleable iron reducing coupling is designed for use in threaded steel or iron pipe systems. It provides a secure transition between two different nominal pipe sizes and is suitable for gas, steam, air, and non-potable water applications. The coupling features female National Pipe Taper (NPT) threads on both ends and conforms to ANSI/ASME and ASTM specifications for mechanical joint integrity.

Constructed from ASTM A197 grade malleable iron and manufactured in accordance with ASME B16.3, this fitting supports Class 150 service and is commonly used in commercial, residential, and light industrial installations. The black finish indicates that it is intended for systems that do not require corrosion-resistant coatings (e.g., fuel gas or HVAC loop piping).

Technical Specifications

• Nominal Sizes: 1/2 inch FPT x 3/8 inch FPT
• Material: Black Malleable Iron (ASTM A197)
• Thread Standard: ANSI B1.20.1 (NPT)
• Fitting Type: Reducing Coupling
• Finish: Black (non-galvanized)
• Pressure Rating: Class 150 (ASME B16.3)

Application Areas

• • Fuel gas piping systems (natural gas or propane)
• • Low-pressure steam lines and heating loops
• • Air distribution and compressor lines
• • Industrial equipment branch connections

Installation Guidelines

Use PTFE thread tape or an appropriate joint compound rated for the system media. Ensure proper alignment and avoid over-tightening to preserve thread integrity. Fittings should be installed in accordance with applicable codes and system specifications. Not intended for use in potable water systems unless otherwise coated or certified.

Material Note

Black malleable iron fittings offer high mechanical strength, are easy to machine, and resist deformation under threaded torque loads. These fittings are suitable for dry environments and applications where zinc coatings (e.g., galvanized) are not required.