1-1/4 inch x 5-1/2 inch Black Steel Nipple

1-1/4" x 5-1/2" Black Steel Nipple – Threaded for Pressure Piping Applications

The 1-1/4" x 5-1/2" Black Steel Nipple is engineered for use in high-pressure piping systems requiring secure, threaded connections. Manufactured from seamless schedule 40 steel pipe, this nipple delivers reliable mechanical strength and performance in water, steam, and gas installations.

Cut and threaded to ANSI B1.20.1 standards, it ensures compatibility with a wide range of malleable and forged iron fittings. The black oxide finish provides a basic level of corrosion protection during handling and installation, making it suitable for indoor environments or locations where external coatings are not required.

Specifications

• Nominal Pipe Size: 1-1/4 inch
• Length: 5-1/2 inch
• Material: Carbon steel
• Finish: Black (uncoated)
• Wall Thickness: Schedule 40
• Ends: NPT threaded male x male
• Standard Compliance: ASTM A53 / ASME B1.20.1

Performance and Application

• ✅ Pressure-Rated Performance Suitable for non-corrosive compressed air, steam, oil, and gas systems up to 150 PSI (based on installation and temperature ratings).
• ✅ Mechanical Strength Seamless steel provides consistent tensile strength for structural integrity under load.
• ✅ Precision Machined Threads Ensures a tight, leak-resistant seal with minimal installation torque required.
• ✅ General Utility Use Often installed in mechanical piping, process lines, fire protection systems, and heating system loops.

Installation Considerations

This fitting is designed for use with compatible NPT-threaded components. Apply a pipe joint compound or PTFE tape to male threads prior to assembly. Avoid over-torquing during installation to maintain thread integrity and prevent distortion.

Where It’s Installed

Common applications include commercial boiler rooms, process piping, natural gas distribution, and air compressor lines. It is also used in steel pipe support assemblies and prefabricated piping manifolds where space and durability are critical.

Did You Know?

Black steel nipples are widely preferred in utility and mechanical systems where welding is not required. Their threaded design allows for rapid installation and disassembly, especially in systems subject to periodic maintenance or reconfiguration.

Choose the 1-1/4" x 5-1/2" Black Steel Nipple when your project demands strength, accuracy, and industry-standard compatibility. Built for performance and engineered to last, it delivers the reliability contractors expect in demanding installations.