1/8 inch x 2-1/2 inch Black Steel Nipple

1/8" x 2-1/2" Black Steel Nipple – Threaded Connector for Low-Pressure Piping Systems

The 1/8 inch x 2-1/2 inch Black Steel Nipple is designed to provide a reliable threaded connection between components in low- to medium-pressure piping systems. Made from welded or seamless carbon steel and finished with a black oxide coating, this fitting is suitable for applications involving air, oil, steam, or gas transport in mechanical and industrial systems.

Manufactured to conform with ANSI/ASME B1.20.1 threading specifications and commonly fabricated in accordance with ASTM A733, this nipple supports consistent engagement with compatible fittings, valves, or pipe segments. It is ideal for use in black iron pipe systems that do not require corrosion resistance from galvanization.

Performance Characteristics

• ✅ Carbon Steel Construction: Offers durability and strength in utility-grade systems.
• ✅ Black Oxide Finish: Provides surface protection during handling and installation.
• ✅ Threaded NPT Ends: Male threads on both sides support secure, pressure-rated assembly with ferrous pipe and fittings.
• ✅ Nominal Size: Designed for compact connections in tight-space installations or branch extensions.

Technical Specifications

• Size: 1/8 inch NPS x 2-1/2 inch length
• Material: Carbon steel (ASTM A53 or A106 equivalent)
• Thread Type: NPT (Male x Male) per ASME B1.20.1
• Coating: Black oxide (non-galvanized)
• Use Class: Suitable for gas, steam, and air systems; not recommended for potable water

Application Overview

This nipple is typically installed in black steel pipe systems used for gas distribution, low-pressure steam, lubricating oil lines, or compressed air setups. Its small diameter and close tolerance threading allow it to be used in valve manifolds, test ports, or where spacing between fittings must be minimized.

Installation Considerations

Use thread sealant or PTFE tape compatible with the system medium to ensure a leak-free joint. Torque application should align with pipe size to avoid thread distortion. Avoid use in corrosive or potable environments unless additional coatings or protections are applied.

Material Note

Black steel nipples are not internally coated and are intended for systems where corrosion exposure is limited or managed. For corrosive environments or water supply, specify galvanized or stainless alternatives as required by project specifications.

The 1/8" x 2-1/2" Black Steel Nipple offers a compact, code-compliant solution for joining threaded components in industrial-grade piping systems. Its reliable construction and standard threading make it a critical part of any contractor’s material package for mechanical service installations.