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

3/4" x 2-1/2" Black Steel Nipple – Threaded Fitting for Pressure and Mechanical Systems

The 3/4" x 2-1/2" Black Steel Nipple is a Schedule 40 threaded pipe segment designed to connect two female-threaded fittings or valves in low to moderate pressure systems. Fabricated from welded or seamless black steel pipe, it is suitable for applications involving air, oil, steam, and gas where corrosion resistance and mechanical strength are required.

This fitting features male NPT threads at both ends and is commonly used in commercial, industrial, and mechanical piping systems. The black oxide finish provides basic surface protection for indoor or dry systems where galvanized coatings are not needed. The length allows for close coupling in confined layouts or service assemblies.

Performance and Installation Characteristics

• ✅ Threaded End Connections Conforms to ANSI/ASME B1.20.1 NPT standard for tight, pressure-rated connections.
• ✅ Carbon Steel Construction Manufactured from ASTM A53 or A106 Grade B steel for durability under pressure and temperature fluctuation.
• ✅ Standard Pipe Wall Thickness Schedule 40 pipe wall maintains structural stability in gas, water, and HVAC installations.
• ✅ Black Finish Intended for non-potable systems where corrosion protection from galvanization is not required.
• ✅ System Compatibility Used in heating loops, gas distribution, air compressor lines, and hydronic supply networks.

Technical Specifications

• Material: Welded or Seamless Carbon Steel (ASTM A53 or A106)
• Nominal Size: 3/4" Diameter x 2-1/2" Length
• Connection Type: MNPT x MNPT (Male National Pipe Thread)
• Pipe Schedule: Sch. 40
• Standards: ASME B1.20.1, ASTM A733, ANSI/ASME B36.10

Applications

Commonly used in black pipe systems for fuel gas distribution, compressed air, closed-loop heating water systems, and mechanical assemblies. The short length makes it ideal for transitions between components with limited spacing, such as pressure gauges, valves, unions, or equipment tie-ins.

Installation Note

Use appropriate thread sealant or PTFE tape during installation to ensure a leak-tight joint. Over-tightening should be avoided to prevent thread deformation or cracking in downstream fittings. Always verify system compatibility and comply with local mechanical and fuel gas codes.

The 3/4" x 2-1/2" Black Steel Nipple offers a durable, standardized solution for joining pipe sections and components in mechanical systems where strength, pressure tolerance, and cost efficiency are key.