3 inch x 6 inch Black Steel Nipple

3" x 6" Black Steel Nipple – Threaded Schedule 40 Pipe Segment

The 3" x 6" black steel nipple is a straight pipe section with male NPT threads on both ends, fabricated from Schedule 40 carbon steel. It is designed for use in pressure-rated mechanical and plumbing systems, where robust, threaded connections are required between fittings, valves, or equipment.

Typically manufactured to ASTM A53 specifications, this nipple supports applications in gas, steam, and oil piping systems. The uncoated black finish is intended for use in dry or closed systems where corrosion protection is either not required or managed externally.

Product Features

• ✅ Nominal Size: 3" NPT x 6" Length
• ✅ Material: Black carbon steel – seamless or welded, Schedule 40 wall thickness
• ✅ Thread Standard: ANSI/ASME B1.20.1 tapered threads for mechanical sealing
• ✅ Finish: Plain black – suitable for gas and mechanical systems where galvanization is not required
• ✅ Use Type: Inline connection of pipe segments, fittings, or equipment in threaded systems

Installation Guidelines

Before installation, apply PTFE tape or thread compound to male threads to ensure a leak-resistant seal. Wrenches should be used only on the unthreaded portion to maintain thread integrity. The nipple should be installed per applicable mechanical or gas code requirements, and pressure-tested if required by jurisdiction or project scope.

Typical Applications

This fitting is commonly used in natural gas distribution, compressed air systems, hydronic heating loops, steam lines, and process piping. It is suitable for both residential and commercial installations where threaded connections are preferred or required.

System Considerations

Black steel pipe and nipples are not rated for potable water systems. They are accepted for use in gas and fuel systems due to their strength and resistance to high-temperature service conditions. When used in corrosion-prone areas, additional coatings or pipe wraps may be recommended.

Technical Specifications

• Size: 3" NPT x 6" Overall Length
• Material Standard: ASTM A53, Type E or S, Grade A/B
• Threading: ANSI/ASME B1.20.1 NPT
• Wall Type: Schedule 40
• Application: Gas, oil, steam, and air systems

The 3" x 6" black steel nipple is designed to provide consistent, pressure-rated performance in demanding mechanical and industrial environments. Its threaded ends allow for quick integration into piping networks where secure, rigid connections are required.