3/8 inch x 5 inch Black Steel Nipple

3/8" x 5" Black Steel Nipple – Threaded Pipe Segment for Steam, Gas, and Hydronic Applications

The 3/8" x 5" black steel nipple is a straight, male-threaded pipe section manufactured from welded or seamless Schedule 40 black steel. It is intended for use in non-potable systems including low- to medium-pressure steam, natural gas, compressed air, and closed-loop hydronic heating. Threads are NPT-compliant and formed to ANSI/ASME B1.20.1 standards for reliable mating with other ferrous pipe components.

Application Overview

This pipe nipple provides an efficient solution for joining pipe fittings or extending lines where precise spacing is required. It is commonly installed in mechanical rooms, boiler systems, gas lines, and general utility piping where galvanization is not required or permitted by code.

Technical Specifications

• Material: Carbon steel, black finish (uncoated)
• Nominal Pipe Size: 3/8 inch
• Overall Length: 5 inches
• Wall Thickness: Schedule 40 (standard weight)
• Thread Type: NPT (National Pipe Taper), conforming to ANSI B1.20.1
• Manufacturing Standard: ASTM A53 Grade A or equivalent
• Operating Pressure: Rated for use in systems up to 150 psi, depending on application and system design

Installation Requirements

Threads must be clean and dry prior to assembly. Apply compatible thread sealant or PTFE tape to male threads before tightening. Avoid over-torquing to prevent thread distortion. Ensure mating components meet required pressure and temperature ratings for system compatibility.

Common Uses

Typically used in:

• Natural gas and propane distribution systems
• Low-pressure steam and hydronic heating lines
• Air compressor systems and mechanical process piping

Material Note

Black steel pipe and fittings are not rated for potable water use due to lack of corrosion-resistant coating. They are appropriate for industrial and mechanical service where code permits uncoated ferrous materials.