1/2 inch x 4 inch Black Steel Nipple

1/2” x 4” Black Steel Nipple – Schedule 40, Threaded Both Ends

The 1/2" x 4" black steel nipple is designed for use in low- to medium-pressure piping systems where a short, rigid extension is required between components. This pipe nipple features male NPT threads on both ends and is fabricated from Schedule 40 black steel, offering compatibility with a wide range of mechanical and utility piping systems including gas, steam, and non-potable water lines.

Manufactured to conform with applicable ASTM specifications (typically A733 and A53 for welded or seamless pipe), this nipple provides dimensional accuracy and durable performance in residential, commercial, and industrial installations.

Product Specifications

• Nominal Pipe Size: 1/2 inch
• Length: 4 inches
• Material: Black steel (carbon steel, Schedule 40)
• Thread Type: NPT (National Pipe Thread), male x male
• Manufacturing Standard: Typically conforms to ASTM A733 for nipples, threads per ASME B1.20.1

Functional Characteristics

• ✅ Threaded Connections – Compatible with other threaded black malleable iron or steel fittings, valves, and pipe sections
• ✅ System Integration – Used for rigid extensions in gas piping, hydronic loops, steam systems, and mechanical utilities
• ✅ Structural Integrity – Suitable for pressure and thermal loads typical of black steel pipe networks
• ✅ Weld-Free Design – Threads machined directly onto pipe ends, eliminating field threading or welding for short runs

Installation Notes

Install using standard pipe sealant or PTFE thread tape to ensure a leak-resistant joint. Proper torque should be applied using appropriately sized wrenches to avoid damage to threads or deformation of pipe ends. Do not overtighten, particularly when connecting to cast fittings.

Common Applications

This fitting is widely used in utility installations including fuel gas distribution, oil piping, air compressor lines, fire protection loops, and heating plant piping. The 4" length is ideal for use in spacing between fittings, valve tie-ins, and threaded equipment connections within confined spaces.

Material and Service Note

Black steel pipe and fittings are intended for use in non-corrosive environments and are not recommended for potable water without a protective coating. Their carbon steel composition offers high tensile strength, machinability, and temperature tolerance.

The 1/2” x 4” black steel nipple is a standard fitting for pressure-rated systems requiring secure, threaded connections in pipe assemblies that comply with mechanical code and jobsite specifications.