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

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

The 1/2" x 4-1/2" black steel nipple is a Schedule 40 pipe segment with National Pipe Taper (NPT) male threads on both ends. Manufactured from carbon steel in accordance with ASTM A53 or equivalent specifications, this fitting is designed for mechanical and plumbing systems where threaded pipe-to-pipe connections are required.

Black steel nipples are uncoated and intended for use in non-potable water, gas, air, and steam systems. The 4-1/2" length provides flexibility for system spacing, tie-ins, and equipment offsets in a compact layout.

Product Features

• ✅ Nominal Size: 1/2" NPT
• ✅ Overall Length: 4-1/2"
• ✅ Wall Type: Schedule 40 – suitable for medium-pressure piping systems
• ✅ Material: Welded or seamless black carbon steel (ASTM A53 Grade A/B)
• ✅ Thread Standard: ANSI/ASME B1.20.1 NPT – tapered threads for tight mechanical seal

Installation Requirements

Threaded connections should be assembled using PTFE tape or thread compound to ensure leak resistance. Wrenches should be applied only to the unthreaded portion to avoid damaging threads. Follow local code requirements for material usage, especially in gas or hydronic systems.

Typical Applications

This fitting is commonly used in natural gas lines, compressed air systems, oil piping, and hydronic heating loops. It is appropriate for both residential and commercial installations where durable threaded connections are needed between piping components, valves, or equipment.

Material Use Note

Black steel pipe is not approved for potable water applications due to its uncoated interior, but it is suitable for closed-loop and dry systems. It is widely accepted for use in gas and heating infrastructure where corrosion from water is not a concern.

Compliance and Standards

• Specification: ASTM A53, ASME B36.10
• Threading: ANSI/ASME B1.20.1
• Use Category: Mechanical, fuel gas, steam, and air systems

The 1/2" x 4-1/2" black steel nipple provides a pressure-rated, threaded connection for Schedule 40 steel piping systems. Designed for use in industrial and building mechanical systems, it ensures dimensional consistency and reliable performance under typical service conditions.