1/8 inch x 4 inch Black Steel Nipple

1/8" x 4" Black Steel Nipple – Threaded Pipe Segment for Low-Pressure Systems

The 1/8 inch x 4 inch Black Steel Nipple is a precision-machined, male-threaded component used to connect two female-threaded fittings or pipe segments in mechanical piping systems. Manufactured from carbon steel with a black oxide finish, this nipple is designed for use in non-corrosive environments and systems not requiring galvanization.

Commonly used in compressed air lines, natural gas piping, and industrial process systems, this nipple provides a direct, rigid connection and is suitable for both horizontal and vertical installations where space constraints or directional flow requirements are a consideration.

Performance and Application Features

• ✅ Material: Carbon steel with black finish – suitable for interior and dry system environments.
• ✅ Threaded Ends: Male National Pipe Thread (NPT) on both sides, per ANSI/ASME B1.20.1 standards.
• ✅ Wall Thickness: Typically Schedule 40 or per ASTM A733 fabrication standards.
• ✅ Length: 4 inches overall – designed to bridge fixed spacing between fittings or valves.
• ✅ Application: Low- to medium-pressure piping systems carrying gas, air, steam, or non-potable fluids.

Technical Specifications

• Nominal Pipe Size: 1/8 inch
• Overall Length: 4 inches
• Thread Type: NPT (Male x Male)
• Coating: Black oxide for surface scale resistance
• Compliance: Meets ASTM A53 or A106 and ASTM A733 fabrication tolerances

Installation Considerations

Apply pipe thread sealant or PTFE tape rated for system media to both threaded ends. Over-tightening may result in thread distortion or misalignment. For gas service, leak testing under operating pressure is recommended per applicable codes. Black steel nipples are not intended for potable water use without additional corrosion protection or system separation.

Common Use Cases

This component is frequently used in gas distribution systems, boiler feed lines, pneumatic systems, and control valve assemblies. It allows for straightforward integration into threaded piping configurations that require precise spacing or temporary assembly.

Material Insight

Black steel is a preferred material for interior gas piping and non-corrosive service lines due to its strength, machinability, and cost-effectiveness. The absence of galvanization makes it suitable for applications where corrosion exposure is minimal or managed by environmental controls.

The 1/8" x 4" Black Steel Nipple is a reliable solution for professional-grade piping installations requiring compact, threaded connections. Designed to meet dimensional and performance standards, it supports consistent results in a variety of mechanical and industrial applications.