1-1/4 inch x 7 inch Black Steel Nipple

1-1/4” x 7” Black Steel Nipple – Threaded Pipe Segment for High-Pressure Applications

The 1-1/4” x 7” Black Steel Nipple is a schedule-grade steel fitting designed to join two female-threaded pipe components in mechanical and plumbing systems. Fabricated from carbon steel pipe and finished with a black oxide coating, this nipple is intended for use in non-potable systems such as gas distribution, hydronic heating loops, and industrial process lines.

This fitting features National Pipe Taper (NPT) threads on both ends, machined to ANSI/ASME B1.20.1 specifications. Its seven-inch length provides a direct connection for bridging fixed pipe runs without requiring couplings, while also accommodating precise spacing and alignment in tight or offset installations.

Key Features and Performance

• ✅ Material: Carbon steel with black oxide coating – intended for dry and oil-based systems.
• ✅ Threading: Tapered male threads on both ends conform to ANSI/ASME B1.20.1 NPT standards.
• ✅ Wall Thickness: Typically Schedule 40 unless otherwise specified, suitable for standard pressure ratings.
• ✅ Application Scope: Used in natural gas, low-pressure steam, air, and mechanical piping systems.
• ✅ Corrosion Resistance: Black finish protects during handling and installation; not recommended for corrosive or potable environments.

Installation Considerations

Apply PTFE thread seal tape or thread compound prior to installation to ensure pressure integrity. Use pipe wrenches or chain tongs appropriate to the nipple size and avoid excessive torque, which can damage mating components. Inspect threads and pipe body for burrs, scale, or deformation before use. Do not weld after galvanization or threading, as it may compromise the structural integrity or coating.

Use Cases and System Integration

Common in commercial gas piping networks, mechanical boiler systems, and industrial air compressors, this 1-1/4” nipple offers compatibility with cast iron, black malleable, and forged steel fittings. It is suitable for vertical risers, drop legs, appliance connections, and system modifications requiring short, rigid extensions.

Specification Summary

• Nominal Size: 1-1/4”
• Length: 7” overall (threaded both ends)
• Thread Type: NPT – ANSI B1.20.1
• Finish: Black oxide-coated
• Pressure Rating: Matches pipe schedule (verify per system requirements)

Code Compliance Note

This product is not rated for potable water systems. Always verify local mechanical and fuel gas codes before installation. For systems requiring corrosion resistance or water safety, specify galvanized or lead-free brass alternatives.