1-1/4 inch Black Iron Tee Female x Female x Female

1-1/4” Black Malleable Iron Tee – Threaded FIP x FIP x FIP for Pressure and Gas Systems

The 1-1/4” Black Malleable Iron Tee is a threaded fitting used for creating 90-degree branch lines in steel pipe systems. Manufactured from ASTM A197 malleable iron and coated with a black oxide finish, this tee provides high tensile strength and excellent resistance to internal pressure. It is suitable for low- to medium-pressure applications in gas, steam, air, and hydronic piping systems.

Conforming to ASME B16.3 and B16.14 dimensional standards, the fitting features National Pipe Taper (NPT) threads on all three ends, allowing secure and leak-resistant joints when installed with properly prepared piping and thread sealant.

Technical Specifications

• ✅ Nominal Size: 1-1/4 inch
• ✅ Connection Type: FIP x FIP x FIP (Threaded Female National Pipe Taper)
• ✅ Material: Malleable Cast Iron (ASTM A197)
• ✅ Finish: Black Oxide Coating
• ✅ Standards: ASME B16.3, ASME B16.14, UL/CSA Listed for applicable systems

Performance Characteristics

• ✅ Pressure Rating: Up to 300 PSI for non-shock cold water, oil, or gas systems
• ✅ Temperature Range: Suitable for systems up to 150°C (302°F)
• ✅ Mechanical Strength: Excellent impact and stress resistance in assembled piping networks
• ✅ Thread Compatibility: Accepts standard NPT pipe threads; recommended use with PTFE tape or joint compound

Application Scope

This black iron tee is commonly used in natural gas and propane piping networks, compressed air systems, fire protection risers (when code permits), and hydronic heating circuits. It enables a durable branch connection at perpendicular angles and supports long-term performance in rigid pipe runs.

Installation Guidance

Ensure threads are clean and free of debris before assembly. Apply thread sealant and hand-tighten the fitting, then use a pipe wrench to complete the installation to the manufacturer’s torque specifications. Avoid over-tightening to preserve thread integrity and prevent stress cracking.

Professional Considerations

Black malleable iron fittings are the industry standard in non-potable pressurized systems due to their structural resilience, dimensional precision, and ease of disassembly. Their black finish makes them easily distinguishable for gas line applications during inspections.

Summary

The 1-1/4” Black Malleable Iron Tee provides a reliable, pressure-rated solution for branching pipe in threaded mechanical and utility piping systems. With its robust construction, standardized thread dimensions, and resistance to thermal and mechanical stress, it supports consistent installation quality in new construction, retrofits, and industrial service environments.