1/8 inch x 3 inch Black Steel Nipple

1/8" x 3" Black Steel Nipple – Threaded Connector for Gas, Air, and Oil Systems

The 1/8" x 3" Black Steel Nipple is a straight, Schedule 40 steel pipe segment with male NPT threads on both ends, used for connecting pipe sections or system components in non-potable, low- to moderate-pressure piping systems. This component is manufactured from black steel with a protective oxide finish and is commonly used in natural gas, oil, and air distribution lines.

Its compact size makes it well-suited for installations in tight mechanical assemblies or when short extensions are needed between fittings, valves, or equipment. The nipple is machined to conform with industry-standard tolerances, allowing for a consistent seal when installed with appropriate thread sealing material.

Functional Attributes

• ✅ Nominal Dimensions: 1/8" diameter x 3" length
• ✅ Material: Welded black steel pipe conforming to ASTM A53/A733
• ✅ Connection Type: Male NPT x Male NPT (ANSI B1.20.1)
• ✅ Wall Type: Standard Schedule 40 thickness
• ✅ Finish: Black oxide coating for minimal corrosion resistance in dry environments

Installation Guidelines

Install using standard pipe wrenches and appropriate joint compound or PTFE tape. Do not over-tighten, as excessive torque can damage the threads or mating fittings. Inspect mating threads for damage or debris prior to assembly. For gas installations, refer to applicable code requirements for allowable materials and pressure limitations.

Typical Applications

This steel nipple is typically used in mechanical systems transporting natural gas, compressed air, lubricants, or non-potable fluids. It is appropriate for use in industrial shops, HVAC gas piping networks, boiler systems, and appliance hookups where short-length threaded connections are needed.

Important Considerations

Black steel fittings are not approved for potable water systems. Use is limited to systems where corrosion from water exposure is not a concern. All installations should be verified for code compliance, particularly in pressure-rated fuel gas or steam systems.

Specifications Summary

• Size: 1/8" NPT x 3" length
• Material: Black steel (ASTM A53 Grade A or equivalent)
• End Connections: Threaded, NPT (National Pipe Taper)
• Compliance: Meets dimensional and material standards for Schedule 40 pipe nipples

The 1/8" x 3" Black Steel Nipple is a standard component for field-assembled piping where durability and threaded compatibility are required. Its use in code-compliant gas and mechanical systems supports consistent performance in residential, commercial, and industrial environments.