1-1/4 inch x 3 inch Black Steel Nipple

1-1/4” x 3” Black Steel Nipple – For High-Integrity Threaded Pipe Connections

The 1-1/4” x 3” black steel nipple is designed for use in systems requiring threaded joints capable of withstanding high pressure and mechanical stress. Manufactured from schedule 40 black steel pipe, this fitting delivers reliable performance in both gas and hydronic applications.

Professional-Grade Attributes

• ✅ Threaded Male Ends – NPT threads on both ends ensure compatibility with standard black malleable and cast iron fittings.
• ✅ Schedule 40 Wall Thickness – Provides structural integrity for medium- to high-pressure systems.
• ✅ Carbon Steel Construction – Fabricated from ASTM A53 Grade A or B pipe, suitable for steam, air, and gas distribution lines.
• ✅ Precision-Cut Length – Uniform 3” length ideal for short close nipple connections or offsets.
• ✅ Oil-Coated Finish – Black oxide coating resists external corrosion during handling and installation.

Specifications

• Material: Welded or seamless black carbon steel pipe (ASTM A53)
• Size: 1-1/4” nominal diameter
• Length: 3” overall (threaded both ends)
• Thread Standard: ANSI/ASME B1.20.1 NPT
• Wall Thickness: Schedule 40
• Pressure Rating: Suitable for up to 150 psi in standard installations (check local code for specifics)

Typical Use Cases

This fitting is most often used in fuel gas systems, low-pressure steam lines, and hydronic heating loops. Also suitable for general industrial service and mechanical piping where corrosion-resistant coating is not required internally.

Installation Guidelines

Install with appropriate pipe sealant or PTFE thread tape to ensure a watertight or gastight seal. Use caution to avoid overtightening, which may deform threads or damage mating fittings. For optimal results, thread engagement should be 3–5 full turns beyond hand-tight.

Note:

Black steel pipe and nipples are intended for non-potable systems. For water supply lines, use galvanized, copper, brass, or PEX-based systems per applicable codes.

The 1-1/4” x 3” black steel nipple offers the mechanical strength and thread reliability required for critical system joints. Designed and manufactured to meet the demands of professionals in the field, it remains a standard component in commercial and industrial mechanical installations.