3/4 inch x 1/8 inch Galvanized Cast Iron Bushing

3/4 inch x 1/8 inch Galvanized Iron Bushing – Threaded Reducer for Pipe Size Transitions

The 3/4 inch x 1/8 inch Galvanized Iron Bushing is a reducing fitting designed to connect pipes of dissimilar sizes in threaded mechanical systems. Constructed from zinc-coated malleable iron, it provides both mechanical strength and corrosion resistance in low-pressure, non-potable water, air, and gas piping systems.

This bushing features male National Pipe Taper (NPT) threads on the larger outside diameter and female NPT threads on the smaller internal diameter, allowing for a secure, leak-resistant transition between a 3/4 inch fitting or pipe and a 1/8 inch threaded connection. It is intended for use in accordance with ASME and ASTM standards in commercial, industrial, and agricultural piping systems.

Product Specifications

• ✅ Nominal Sizes: 3/4 inch Male NPT x 1/8 inch Female NPT
• ✅ Material: Galvanized malleable iron per ASTM A197
• ✅ Finish: Hot-dip zinc coating for corrosion protection
• ✅ Standards: Conforms to ASME B16.3 and ANSI B1.20.1 for threading
• ✅ Pressure Rating: Class 150 – rated for non-shock pressures up to 300 PSI at ambient temperature

Installation Considerations

Apply a compatible thread sealant or PTFE tape to the male threads before installation. Use a pipe wrench to tighten, ensuring not to over-torque and risk cracking or distorting the fitting. Bushing should be installed in compliance with system design specifications and local code requirements. This component is not intended for potable water unless specifically certified as lead-free.

Typical Applications

Used to reduce pipe diameters in air compressor systems, fuel oil lines, gas supply branches, sprinkler heads, and general-purpose utility piping. Its galvanized finish helps resist rust in environments subject to moisture, such as mechanical rooms, outdoor installations (when sheltered), and service utility connections.

Material Properties

Malleable iron offers strong mechanical properties and dimensional consistency. The galvanized coating helps prevent oxidation in non-potable systems but may not be suitable for aggressive chemicals or prolonged submersion. For critical corrosion control, additional sealing or coating may be required.

The 3/4 inch x 1/8 inch Galvanized Iron Bushing is a compact and effective solution for reducing threaded pipe sizes within compliant piping systems. Its precision-machined threads and corrosion-resistant construction support consistent performance in demanding mechanical environments.