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

1/2" x 5-1/2" Black Steel Pipe Nipple – Threaded Schedule 40 Connector for Mechanical Systems

The 1/2" x 5-1/2" Black Steel Nipple is a Schedule 40 carbon steel pipe segment with male National Pipe Taper (NPT) threads on both ends. It is designed to provide a rigid, leak-resistant extension or connection between two female-threaded fittings. Manufactured from welded or seamless black steel pipe, this nipple is suitable for use in low- to medium-pressure applications, including gas distribution, hydronic heating, air systems, and industrial plumbing installations.

Threading conforms to ASME B1.20.1 standards, ensuring compatibility with NPT-threaded components. The black oxide coating provides limited surface corrosion protection and is intended for use in indoor or dry-service environments.

Performance Features

• ✅ Material: Carbon steel with black oxide finish (ASTM A53 or A106 pipe body)
• ✅ Size: 1/2" nominal diameter x 5-1/2" overall length
• ✅ Thread Type: NPT (Male x Male), machined to ASME B1.20.1 specifications
• ✅ Wall Thickness: Schedule 40 (standard weight)
• ✅ Working Pressure: Dependent on system configuration; typically rated for 150–300 PSI in compatible applications

Installation Requirements

To ensure leak-free service, use an approved thread sealant or PTFE tape when installing the nipple into mating fittings. Proper alignment and torque are necessary to maintain joint integrity without damaging threads. Avoid overtightening, which may deform the thread profile or compromise adjacent components.

Typical Applications

This black steel nipple is used across commercial and residential construction for systems that include fuel gas piping (when approved by local code), steam lines, compressed air systems, and general-purpose mechanical piping. It is not suitable for potable water systems unless internally coated or galvanized.

Standards and Code Compliance

Manufactured to meet ASTM A733 requirements for pipe nipples, and compatible with pipe and fittings constructed per ASTM A53, A106, and ASME B16.3/B16.14 standards. Black steel fittings are often selected for fire sprinkler systems and gas line installations where galvanized finishes are not required.

Technical Summary

• Nominal Size: 1/2 inch
• Length: 5-1/2 inches (overall)
• Material: Carbon steel, black oxide coated
• Wall Thickness: Schedule 40
• End Connections: NPT Male x NPT Male
• Specifications: ASTM A733, ASME B1.20.1