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

1" x 4-1/2" Schedule 40 Black Steel Nipple – Threaded for High-Demand Piping Applications

The 1" x 4-1/2" black steel nipple is designed for use in threaded piping systems requiring straight connections in low- to medium-pressure mechanical, water, gas, and air applications. Manufactured from ASTM A53 Grade A or B schedule 40 welded or seamless carbon steel pipe, this nipple provides durable performance and dimensional accuracy for code-compliant installations.

Performance Features

• ✅ Machined NPT Threads – Conforms to ANSI/ASME B1.20.1 for consistent sealing performance across all standard female fittings.
• ✅ Carbon Steel Construction – Delivers excellent mechanical strength, impact resistance, and tensile integrity in structural and pressurized systems.
• ✅ Protective Black Finish – Ideal for above-ground installations where corrosion protection is required in non-potable or gas service lines.
• ✅ Threaded Ends – Male-threaded on both sides for compatibility with iron fittings, valves, and flanges in MIP systems.

Technical Specifications

• Material: Schedule 40 black carbon steel (ASTM A53)
• Length: 4-1/2 inches (measured end-to-end, including thread length)
• Nominal Pipe Size: 1 inch
• Thread Type: NPT male x NPT male
• Pressure Rating: Up to 150 psi WOG (non-shock)
• Application: Water, gas, oil, steam, and air systems where galvanization is not required

Installation Considerations

Install using pipe wrenches and appropriate thread sealant or PTFE tape to achieve a leak-resistant connection. Threads should be fully engaged and torqued per system pressure requirements. Always verify compatibility with local mechanical and fuel gas codes before installation. Not suitable for potable water systems without corrosion-resistant coating or lining.

Common Applications

This nipple is typically used in:

• Natural gas or propane distribution lines
• Low-pressure steam return piping
• Closed-loop hydronic heating systems
• Air compressor lines and commercial HVAC systems

Did You Know?

Black steel nipples are manufactured from welded or seamless pipe and cut to length before threading. Despite the name, the black color results from a surface treatment, not the steel composition itself. They’re preferred in fuel and heating systems for their thermal stability and mechanical resilience.

The 1" x 4-1/2" black steel nipple is a key component in threaded pressure systems where structural integrity and leak-free performance are required. Specified by contractors for its compatibility, pressure rating, and longevity, it remains a reliable choice for mechanical and industrial plumbing layouts.