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

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

The 2" x 4-1/2" black steel nipple is designed for use in low- to medium-pressure piping systems where durability, dimensional accuracy, and mechanical strength are critical. Manufactured from seamless steel pipe and precision-threaded to ANSI standards, this fitting enables consistent and secure connections in gas, oil, steam, or air applications.

This component is fabricated to ASTM A53/A733 specifications, suitable for use in both industrial and commercial installations requiring NPT (National Pipe Thread) connections. The black finish provides basic oxidation resistance during handling and storage, while the steel substrate delivers the necessary tensile strength for high-demand environments.

Product Performance Characteristics

• ✅ Thread Standardization – Tapered NPT threads meet ANSI B1.20.1 specifications for pressure-rated seal compatibility.
• ✅ Material Specification – Made from ASTM A53 Grade A or B seamless steel pipe, with a plain black finish (uncoated).
• ✅ High Tensile Strength – Supports service pressures typical of natural gas, compressed air, and closed-loop hydronic systems.
• ✅ Corrosion Control Ready – Black steel is intended for applications where protective coatings or pipe wrapping may be applied post-installation.
• ✅ Dimensional Accuracy – Machined to consistent cut length and thread depth to ensure proper makeup with mating fittings.

Installation Considerations

This nipple is typically installed using pipe wrenches and suitable thread sealing material. PTFE tape or pipe joint compound is recommended based on system type (e.g., gas or water). Avoid over-torquing to prevent thread deformation or misalignment. Always confirm local code requirements for material compatibility and installation methods in fuel gas or mechanical piping systems.

Technical Data

• Nominal Size: 2" diameter
• Length: 4-1/2" overall
• Material: Uncoated black steel (ASTM A53)
• End Connections: NPT male thread both ends
• Thread Type: ANSI B1.20.1 tapered pipe thread

Use Case Environments

Common in mechanical rooms, boiler systems, fuel gas manifolds, and compressed air lines, this black steel nipple serves as a rigid connector between threaded fittings or valves. It’s applicable in both retrofit and new construction scenarios where schedule 40 steel pipe is standard.

System Integration Insight

Black steel nipples are frequently specified in non-potable systems due to their strength and ease of assembly. Their ability to maintain integrity in high-temperature and pressure service makes them a go-to choice for industrial and commercial contractors working on gas distribution, process piping, or HVAC systems.