1-1/4 inch x 3-1/2 inch Black Steel Nipple

1-1/4" x 3-1/2" Black Steel Nipple – Schedule 40

The 1-1/4" x 3-1/2" black steel nipple is manufactured for applications involving low- to medium-pressure systems. Constructed from welded Schedule 40 black steel pipe, this fitting is designed for use in piping configurations that require short extensions or threaded joins between fittings or pipe runs.

Product Specifications

• Nominal Size: 1-1/4 inch
• Length: 3-1/2 inches
• Material: Welded black steel (ASTM A53 Grade B or equivalent)
• Wall Thickness: Schedule 40
• Ends: Male NPT threads on both ends (ASME B1.20.1)

Performance Features

• Thread Integrity: Machine-threaded ends ensure consistent, leak-resistant connections when properly sealed with thread sealant or PTFE tape.
• Mechanical Strength: Suitable for use in systems where mechanical durability is critical, including natural gas distribution, air compression, and closed hydronic heating systems.
• Temperature Range: Suitable for ambient and elevated temperatures in dry applications; not rated for potable water due to lack of internal corrosion protection.
• Pressure Handling: Compatible with system pressures typically found in Schedule 40 black steel installations.

Typical Applications

Used in industrial, commercial, and mechanical system configurations, including:

• Natural gas and propane piping systems (non-potable)
• Steam and hydronic heating lines
• Air compressor and vacuum piping setups
• General purpose piping in machine rooms or maintenance areas

Installation Considerations

For optimal results, threads should be cleaned and sealed using approved thread sealant or PTFE tape. Hand-tighten, then wrench-tighten to recommended torque. Installation must follow all applicable local and national mechanical and plumbing codes.

Note:

Black steel pipe nipples are not approved for use in potable water systems due to the potential for internal corrosion. For potable applications, use galvanized or other certified corrosion-resistant materials.

The 1-1/4" x 3-1/2" black steel nipple offers dependable performance for system configurations requiring rigid, threaded short-length pipe connections. Built to specification and pressure-tested, it meets the needs of high-integrity installations across a range of mechanical environments.