1 inch x Close Black Steel Nipple

1 Inch Close Black Steel Nipple – Threaded Schedule 40

The 1 inch close black steel nipple is designed for use in high-strength piping systems where threaded connections are required in minimal space. Fabricated from schedule 40 carbon steel with a black oxide finish, this nipple is commonly employed in oil, gas, steam, and air applications in both residential and commercial environments.

Product Overview

• ✔ Close Pattern – Threads occupy nearly the entire length, providing minimal spacing between connected fittings.
• ✔ Thread Type – National Pipe Taper (NPT) male threads per ANSI B1.20.1 for compatibility with standard fittings.
• ✔ Construction – Schedule 40 welded or seamless steel pipe, finished in black for corrosion resistance in non-potable environments.

Technical Specifications

• Size: 1 inch nominal pipe size
• Length: Close (approx. 1.5" overall)
• Material: Carbon steel, ASTM A53 or equivalent
• Finish: Black (oxide coated for surface protection)
• Ends: Male NPT x Male NPT
• Pressure Rating: Dependent on system; typical for Sch. 40 pipe

Typical Use Cases

Close black nipples are utilized to connect pipe fittings in tight spaces with limited room for extended lengths. Frequently found in natural gas systems, fire sprinkler assemblies, and industrial air or steam lines, these fittings offer quick, secure threaded connections without requiring extra spacing.

Installation Considerations

• ✔ Apply PTFE thread sealant or pipe dope suitable for service type (gas, air, etc.).
• ✔ Ensure threads are clean and not over-torqued to avoid thread damage or deformation.
• ✔ Not suitable for potable water applications unless coated or lined per code.

Code Compliance

Conforms to ASME B31.3 and applicable sections of the International Plumbing Code (IPC) for mechanical system installations. Always verify local jurisdictional requirements.

Note

Black steel nipples are not rated for corrosion resistance in water supply applications. Galvanized or brass options should be used where potable water or corrosive fluids are present.

The 1 inch close black steel nipple provides a compact, durable connection method in threaded pipe systems. Its robust construction and proven performance make it a dependable choice for contractors working on mechanical, HVAC, or fuel gas distribution lines.