4 inch x 2 inch Black Iron Bushing

4" x 2" Black Malleable Iron Bushing – Built for Pressure-Rated Reductions

The 4" x 2" black malleable iron bushing is a precision-machined fitting designed for transitioning between two different nominal pipe sizes in threaded systems. Manufactured from ASTM A197 malleable iron and coated with a protective black finish, this bushing provides strength, dimensional consistency, and corrosion resistance suitable for gas, air, steam, and water systems in commercial and industrial applications.

Key Performance Features

• ✅ Pressure Rated for General Use – Commonly used in systems with pressures up to 150 PSI, suitable for non-potable water and gas services.
• ✅ Accurate NPT Threads – Tapered male and female threads conform to ANSI/ASME B1.20.1 for a secure, leak-resistant mechanical seal.
• ✅ Mechanical Strength – Cast and heat-treated for optimal tensile strength and impact resistance in demanding piping layouts.

Specifications

• Material: Black malleable iron (ASTM A197)
• Size: 4" male x 2" female nominal pipe size (NPS)
• Thread Type: National Pipe Taper (NPT), per ANSI B1.20.1
• Finish: Black iron (oil-based coating to resist rust during storage and transport)
• Standards: Complies with ASME B16.3 for fittings and B16.14 for bushings

Installation Notes

For optimal sealing, apply appropriate thread compound or PTFE tape. Ensure that the fitting is torqued to specification to avoid over-tightening, which can crack cast iron. This bushing should only be used in non-potable systems or where local code allows for black iron.

Applications

Commonly used in gas distribution lines, HVAC piping, compressed air systems, and low-pressure water systems. Ideal for retrofits and system upgrades requiring diameter transitions while maintaining mechanical thread integrity.

Additional Information

Black malleable iron fittings like this bushing are not intended for use with potable water systems. Always verify compatibility with project specifications and jurisdictional plumbing or mechanical codes before use.