1-1/4 inch x 12 inch Black Steel Nipple

1-1/4" x 12" Black Steel Nipple – Threaded for Industrial-Grade Connections

The 1-1/4" x 12" black steel nipple is manufactured for use in high-demand plumbing, mechanical, and gas piping systems. Fabricated from Schedule 40 welded steel pipe and finished with a black oxide coating, this fitting is designed for non-potable service in steam, air, gas, and oil applications where corrosion resistance and structural strength are essential.

Both ends are machine-threaded to ANSI B1.20.1 NPT standards, ensuring compatibility with a wide range of fittings and minimizing the risk of connection failure under pressure. Each piece is inspected for dimensional consistency and threading accuracy to support leak-tight installations in commercial and industrial settings.

Key Features

• ✅ Thread Type: Tapered NPT for secure mechanical joints without welding
• ✅ Material Strength: Constructed from carbon steel, suitable for high-pressure systems
• ✅ Surface Treatment: Black finish protects against external corrosion in dry environments
• ✅ Code Compliance: Conforms to applicable ASTM and ASME specifications

Specifications

• Nominal Pipe Size: 1-1/4 inch
• Length: 12 inches (close cut to nominal length)
• Material: Welded carbon steel with black oxide coating
• Wall Thickness: Standard Schedule 40
• Thread Standard: ANSI/ASME B1.20.1

Common Applications

This black steel nipple is frequently installed in heating systems, compressed air lines, fuel oil piping, and fire protection systems. It is also suitable for connecting equipment in commercial mechanical rooms, boiler systems, and process piping where galvanized or stainless steel is not required.

Installation Considerations

Installation requires a pipe wrench and appropriate sealant—such as PTFE tape or pipe joint compound—applied to threaded connections. Always verify pipe thread engagement and system pressure ratings prior to commissioning. Ensure that pipe alignment avoids introducing stress at the fittings.

Note:

Black steel is not approved for potable water applications due to its vulnerability to internal corrosion. For systems exposed to moisture or chemical environments, consult material compatibility standards before selection.

The 1-1/4" x 12" black steel nipple provides robust, code-compliant performance for demanding piping layouts. Its strength, dimensional consistency, and thread integrity make it a dependable component in engineered plumbing systems.