1 inch x 3/8 inch Black Iron Bushing

1" x 3/8" Black Malleable Iron Hex Bushing – NPT Threads

The 1 inch x 3/8 inch Black Iron Bushing is a reducing fitting used to connect male-threaded components of differing sizes in threaded piping systems. Constructed from black malleable iron, this hex bushing provides a durable mechanical transition within gas, steam, air, or water systems where a 1" female-threaded fitting must accept a 3/8" male-threaded pipe or component.

Product Features

• ✅ Material: Black malleable cast iron, ASTM A197 compliant
• ✅ Connection: 1" Male NPT x 3/8" Female NPT
• ✅ Design: Hexagonal shoulder for wrench-tightening during installation
• ✅ Finish: Black oxide coating for resistance to corrosion in non-potable environments

Technical Specifications

• Nominal Size: 1 inch x 3/8 inch
• Thread Standard: ANSI/ASME B1.20.1 (tapered pipe threads)
• Working Pressure: Up to 150 psi for steam and 300 psi for non-shock water, oil, and gas service (WOG)
• Temperature Rating: Suitable for operating temperatures up to 150°C (302°F)
• Compliance: Meets ASME B16.3 and B16.14 standards for malleable iron threaded fittings

Installation Guidelines

Apply PTFE tape or pipe joint compound to male threads prior to installation. Hand-tighten initially, then use a wrench on the hex head to achieve final torque. Over-tightening may cause cracking. This fitting is intended for use in rigid piping systems and should not be used in applications involving plastic components unless permitted by the system specification.

Common Applications

This hex bushing is typically used in:

• Gas distribution lines (natural gas, propane)
• Closed-loop hydronic heating systems
• Compressed air piping
• Steam and water distribution in mechanical rooms

Material Notes

Black malleable iron fittings are suitable for non-potable fluid systems where corrosion resistance and high mechanical strength are required. For potable water applications, galvanized versions or brass alternatives should be considered per local code.

The 1" x 3/8" Black Malleable Iron Bushing offers a durable, code-compliant solution for reducing threaded connections in rigid steel piping systems, supporting consistent mechanical integrity across a range of commercial and industrial applications.