1-1/4 inch x 2-1/2 inch Black Steel Nipple

1-1/4" x 2-1/2" Black Steel Nipple – Schedule 40, Threaded Both Ends

The 1-1/4" x 2-1/2" Black Steel Nipple is a Schedule 40 welded or seamless pipe section used to join two female-threaded components in pressurized or non-pressurized piping systems. This nipple is fabricated from ASTM A53 Grade A or B carbon steel and features NPT threads conforming to ANSI B1.20.1 on both ends. It is intended for use in mechanical, industrial, and gas piping systems where strength, durability, and dimensional precision are required.

Black steel nipples are typically used in non-potable water, steam, air, oil, and gas systems and are suitable for above-ground applications. The black oxide finish offers limited corrosion resistance and is intended for dry or low-moisture environments.

Technical Specifications

• ✅ Material: Carbon steel (ASTM A53, black finish)
• ✅ Nominal Size: 1-1/4 inch
• ✅ Length: 2-1/2 inches (end-to-end)
• ✅ Connection Type: NPT male x NPT male
• ✅ Wall Thickness: Schedule 40
• ✅ Pressure Rating: Up to 150 PSI for steam/air; 300 PSI for water/oil (non-shock)
• ✅ Compliance: ANSI B1.20.1, ASME B31.3 piping standards (when installed accordingly)

Common Applications

Used across a range of industrial, commercial, and residential systems, this steel nipple serves as a connector or extension in:

• ✅ Fuel gas lines (natural gas, propane)
• ✅ Compressed air distribution networks
• ✅ Low-pressure steam piping
• ✅ Hydraulic and lubrication systems
• ✅ General mechanical piping requiring short-length transitions

Installation Considerations

Threaded joints should be assembled with an appropriate thread sealant (e.g., PTFE tape or pipe joint compound rated for the service medium). Tighten fittings using a pipe wrench, ensuring not to exceed torque limits that may distort threads. Proper thread engagement and seal integrity are critical to maintaining system pressure and safety.

Key Benefits

• ✅ Machined NPT Threads: Ensures consistent thread engagement and sealing performance
• ✅ Standard Schedule 40 Wall: Supports common pressure and flow conditions in mechanical systems
• ✅ Welded or Seamless Body: Meets industry norms for short-length pressure-rated connectors
• ✅ Code-Ready Design: Compatible with standard piping assemblies used in commercial construction

Code Compliance Note

This nipple is intended for use in systems governed by mechanical codes such as the International Fuel Gas Code (IFGC) and ASME B31.1/B31.3, provided installation conforms to applicable standards and local authority approvals.

The 1-1/4" x 2-1/2" Black Steel Nipple offers a robust and code-compliant solution for joining or extending piping in high-demand systems. Its dimensional accuracy, pressure rating, and compatibility with standard threaded fittings make it a dependable component in professional plumbing and mechanical assemblies.