2 inch Black Iron Coupling Female x Female

2 Inch Black Iron Coupling – Threaded Female x Female NPT

The 2 inch black iron coupling provides a threaded female-to-female connection for joining sections of Schedule 40 or Schedule 80 steel pipe in non-potable systems. Commonly used in industrial and commercial piping, this fitting supports the assembly of systems carrying gas, air, steam, or water in low- to moderate-pressure applications.

Design Features and Material Integrity

Constructed from malleable iron with a black finish, this coupling is suitable for above-ground applications where corrosion protection via coating or environmental controls is provided. Threaded ends are NPT (National Pipe Thread), conforming to ANSI/ASME B1.20.1 standards for tapered pipe threads. Additional features include:

• ✅ Malleable Iron Body – Manufactured per ASTM A197 or equivalent; provides excellent tensile strength and structural reliability.
• ✅ Precision-Cut Threads – Tapered female threads ensure uniform engagement and mechanical sealing with male NPT pipe.
• ✅ Full-Length Coupling – Standard full coupling with threading on both ends, used to extend or repair pipe runs.
• ✅ Pressure Capable – Rated for use in systems up to 150 psi steam and 300 psi air/gas (depending on pipe schedule and application).

Installation Guidelines

Use a suitable thread sealant or PTFE tape on the male pipe threads to ensure a leak-resistant joint. Thread engagement should typically allow 4–5 full turns by hand followed by tightening with a pipe wrench. Avoid over-tightening to reduce risk of thread distortion. This coupling is not intended for use with potable water or corrosive fluids unless specified with a protective coating.

Application Range

Frequently specified in mechanical rooms, boiler systems, industrial process lines, and gas distribution networks. Also used in hydronic heating loops, compressed air systems, and fire protection where threaded pipe assemblies are standard.

Technical Summary

• Material: Malleable Black Iron
• Size: 2 inch nominal pipe size
• Thread Standard: NPT (ANSI B1.20.1)
• Ends: Female Thread x Female Thread
• Compliance: UL and FM listings available depending on manufacturer (check system requirements)

Note on Use

Black iron fittings are not approved for use with potable water unless coated or lined per local codes. Suitable for gas piping and general-purpose systems in compliance with applicable mechanical codes.

The 2 Inch Black Iron Coupling offers durable, code-compliant performance in threaded piping assemblies. Its robust construction and reliable seal make it a critical component for high-integrity gas, air, and water distribution in commercial and industrial applications.