2 inch x 1-1/2 inch Black Iron Reducing Coupling Female x Female

2" x 1-1/2" Black Malleable Iron Reducing Coupling – Threaded Fitting for Pipe Size Transitions

The 2" x 1-1/2" Black Malleable Iron Reducing Coupling is a durable, internally threaded fitting designed for joining two different nominal pipe sizes in low- to medium-pressure piping systems. Fabricated from ASTM A197 malleable iron and finished with a black oxide coating, it is suitable for use in gas, air, steam, and oil applications where corrosion resistance and pressure handling are essential.

This coupling features female National Pipe Tapered (NPT) threads on both ends and provides a compact, code-compliant solution for diameter transitions within rigid piping networks. Its one-piece construction minimizes leak points and is ideal for systems requiring robust mechanical connections without welding or soldering.

Performance Characteristics

• ✅ Material: Malleable Iron, black finish per ASTM A197
• ✅ Thread Standard: Female NPT x Female NPT, compliant with ASME B1.20.1
• ✅ Nominal Sizes: 2" (large end) x 1-1/2" (small end)
• ✅ Pressure Rating: 150 PSI for steam, 300 PSI for water, oil, or gas (WOG) in non-shock conditions
• ✅ Wall Thickness: Designed per ASME B16.3 standards for reducing fittings

Application Scope

Commonly used in gas distribution systems, boiler piping, air compressor lines, and mechanical infrastructure requiring a transition from a 2-inch main to a 1-1/2-inch branch. Suitable for both commercial and industrial applications where strength and system integrity are prioritized. Not intended for direct use in potable water unless coated or rated accordingly.

Installation Notes

Apply PTFE tape or approved thread compound to male pipe threads prior to assembly. Tighten according to manufacturer torque recommendations to avoid over-threading. Ensure both pipe ends are clean, deburred, and aligned to prevent leakage or fitting distortion.

Technical Compliance

• Standards: Conforms to ASME B16.3 and ASTM A197
• Finish: Black oxide coating for dry or interior environments
• End Type: Threaded Female x Female

The 2" x 1-1/2" Black Iron Reducing Coupling provides a durable, threaded transition point between dissimilar pipe diameters in non-potable mechanical systems. Its robust construction and dimensional accuracy make it a reliable component in high-performance gas and fluid piping assemblies.