4 inch x 6 inch Black Steel Nipple

4" x 6" Black Steel Nipple – Heavy-Duty Threaded Pipe Connection for Gas and Water Systems

The 4" x 6" Black Steel Nipple is a schedule 40 welded steel pipe fitting designed for joining piping components in pressurized gas, steam, oil, and water distribution systems. Manufactured to ASTM and ANSI specifications, this nipple features male National Pipe Taper (NPT) threads at both ends, ensuring tight, secure connections in industrial and commercial plumbing applications.

Its 6-inch length provides a reliable option for mid-length extensions, transitions, or fittings within confined piping configurations. Commonly used in hydronic heating systems, fuel gas distribution, and fire protection infrastructure, this nipple offers rugged performance in demanding environments.

Product Specifications

• Material: Black Welded Steel
• Nominal Pipe Size: 4 inch
• Length: 6 inches
• Wall Thickness: Schedule 40
• End Connections: NPT Male x NPT Male
• Pressure Rating: Up to 300 psi (non-potable applications)
• Temperature Rating: Up to 500°F (steam/gas service)
• Standards: Threads meet ANSI B1.20.1; Pipe conforms to ASTM A733 and ASTM A53 specifications

Performance Highlights

• Threaded Design: Precision-cut tapered threads provide strong mechanical joints that seal effectively when installed with appropriate sealants
• Corrosion Resistance: Black oxide coating protects the steel from environmental exposure during storage and installation
• Structural Integrity: Fabricated to support pressure-rated system connections without deformation under stress

Typical Applications

• Natural gas and propane piping systems
• Boiler room and hydronic heating loops
• Industrial oil and air delivery lines
• Fire suppression main connections (dry systems)

Installation Considerations

Install using standard pipe wrenches and apply PTFE tape or pipe dope rated for the media in use. Do not overtighten, as this may compromise thread integrity. Always inspect for thread damage before installation and ensure compatibility with mating components to maintain system reliability.

Did You Know?

Close and standard-length nipples like this 6" configuration allow contractors to make custom-length assemblies without cutting and threading pipe on site—saving installation time and reducing labor costs.

The 4" x 6" Black Steel Nipple is engineered for performance in high-demand piping systems. When strength, thread integrity, and pressure handling are non-negotiable, this fitting delivers consistent, code-compliant results in every installation.