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

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

The 3" x 4-1/2" Black Steel Pipe Nipple is a straight, male-threaded fitting used for extending pipe runs, making direct connections, or adapting system layouts in gas, air, and hydronic piping systems. Manufactured from welded or seamless Schedule 40 black steel pipe in accordance with ASTM A53 or A106 standards, this fitting is designed for use in non-potable service where corrosion resistance and pressure integrity are required.

Product Features and Applications

• ✅ Nominal Size: 3" NPT x 4-1/2" overall length
• ✅ Material: Carbon steel with black oxide finish for indoor use or protected environments
• ✅ Thread Standard: ANSI/ASME B1.20.1 – Tapered male threads on both ends
• ✅ Wall Thickness: Schedule 40 per ASME B36.10M
• ✅ Pressure Rating: Suitable for steam, gas, oil, and compressed air systems within applicable temperature and pressure limits

Installation Guidance

Threaded installation requires the use of an approved pipe joint compound or PTFE tape to ensure a pressure-tight seal. Align threads carefully to avoid cross-threading. Apply torque using a properly sized pipe wrench on the unthreaded body section (if applicable). Follow all local codes and jobsite specifications for system media, operating pressure, and temperature limitations.

Common Use Cases

This steel nipple is commonly used in mechanical rooms, boiler piping systems, natural gas and propane installations, HVAC piping networks, and low-pressure industrial piping systems. It serves as an effective solution for joining fittings, valves, or equipment spaced at non-standard distances.

Material Insight

Black steel pipe nipples are uncoated and suitable for non-corrosive environments or systems where external coating is not required. For installations subject to moisture or chemical exposure, consider galvanized or stainless steel alternatives. Not suitable for potable water systems unless explicitly rated and approved.

The 3" x 4-1/2" Black Steel Nipple provides a durable and code-compliant solution for threaded connections in high-demand mechanical and industrial applications. Manufactured to precise tolerances, this fitting supports reliable performance in pressure-rated systems where strength and dimensional consistency are essential.