2 inch x 18 inch Black Steel Nipple

2" x 18" Black Steel Nipple – Built for High-Pressure Applications

This 2" x 18" black steel nipple is manufactured for strength, consistency, and compatibility in demanding plumbing and mechanical systems. Machined from welded or seamless Schedule 40 black steel pipe, it features tapered (NPT) male threads on both ends and is designed for use in gas, air, oil, and water distribution systems.

With precise threading and corrosion-resistant black oxide finish, this nipple supports secure, pressure-rated connections in both residential and commercial infrastructure. Its 18" length makes it well-suited for bridging pipe runs, equipment hook-ups, or transitions across structural spans where rigidity and alignment are critical.

Key Features

• Threaded Ends: NPT male threads on both ends for compatibility with standard black or galvanized malleable fittings
• Construction: Black steel pipe nipple, typically Schedule 40 wall thickness
• Finish: Anti-corrosive black oxide coating; not intended for potable water
• Pressure Rating: Suitable for systems up to 150 PSI depending on the media and connection integrity
• Applications: Used in natural gas, LP gas, compressed air, low-pressure steam, and oil-based systems

Technical Specifications

• Material: Carbon Steel (ASTM A53 or equivalent)
• Size: 2 inch nominal diameter
• Length: 18 inches
• Connection: NPT threaded both ends
• Wall Type: Schedule 40 (standard weight)
• Compliance: Threads conform to ANSI/ASME B1.20.1; pipe material meets ASTM A53 standards

Installation Notes

Always use appropriate thread sealant (pipe dope or PTFE tape) to ensure leak-free joints. Over-torquing can damage threads and compromise sealing surfaces, so fittings should be tightened to manufacturer-recommended torque specs. Confirm compatibility with the system media and ensure compliance with local codes when used for gas line installations.

Common Uses

This fitting is frequently installed in black iron piping systems for:

• Fuel gas distribution
• Boiler supply and return piping
• Oil circulation lines
• HVAC hydronic piping (non-potable)

Note:

Not rated for potable water applications unless otherwise certified and coated internally. For systems requiring corrosion resistance beyond surface treatment, consider galvanized or stainless steel alternatives.

This 2" x 18" black steel nipple provides reliable performance for high-load applications requiring structural integrity and long-lasting threaded connections. It is a dependable solution for utility piping in mechanical rooms, service corridors, and facility infrastructure.