1-1/4 inch x 6 inch Black Steel Nipple

1-1/4” x 6” Black Steel Nipple – For Pressure-Rated Gas and Hydronic Systems

The 1-1/4” x 6” black steel nipple is manufactured for use in high-pressure mechanical systems where strength, dimensional accuracy, and consistent thread engagement are essential. Threaded male ends provide compatibility with standard iron pipe thread (NPT) fittings in gas distribution, water, steam, and hydronic heating systems.

This steel nipple is fabricated from welded schedule 40 black steel pipe and finished with precisely machined tapered threads to ensure a pressure-tight joint when installed with an approved sealant. Its uncoated surface is suitable for indoor applications where corrosion protection is not required or where it will be painted or coated during system installation.

Product Features

• ✅ Welded Schedule 40 Construction – Meets ASTM A53/A for dimensional and pressure compliance in plumbing and mechanical applications
• ✅ Threaded Both Ends (TBE) – Machined NPT male threads allow for compatibility with cast iron, malleable iron, or forged steel fittings
• ✅ Cut-to-Length Manufacturing – 6-inch length suitable for offset runs and rigid spacing requirements
• ✅ Pressure Rated – Suitable for use in natural gas, steam, and closed-loop hot water systems per ASME B31.3
• ✅ Plain Black Finish – For use where zinc coating is not required; standard for fuel gas and mechanical pipe networks

Technical Specifications

• Nominal Pipe Size: 1-1/4 inch
• Length: 6 inches
• Material: Carbon steel, ASTM A53 Grade A
• Wall Thickness: Schedule 40
• Ends: Threaded Male NPT x Male NPT
• Finish: Black (non-galvanized)

Common Applications

This fitting is frequently used in:

• Gas distribution piping (natural gas, propane)
• Hydronic heating systems and boiler piping
• Low-pressure steam piping
• Oil burner and fuel transfer lines
• Commercial mechanical installations requiring rigid connections

Installation Guidelines

Install with approved PTFE thread sealant or pipe joint compound per code. Threads must engage properly to maintain mechanical strength and seal integrity. Torque application should follow ASTM recommendations to avoid over-tightening and thread distortion. When used in gas applications, verify that all joints pass pressure testing before commissioning the system.

Note on Material Suitability

Black steel is intended for non-corrosive, indoor applications. For potable water or outdoor systems exposed to moisture, galvanized or stainless steel alternatives should be considered to comply with applicable code and corrosion requirements.

The 1-1/4” x 6” black steel nipple delivers the dimensional accuracy and pressure performance required in demanding mechanical and fuel gas systems. Proper installation ensures reliability across a wide range of industrial and commercial uses.