3/8 inch x 2-1/2 inch Black Steel Nipple

3/8" x 2-1/2" Black Steel Nipple – Threaded Schedule 40 for High-Pressure Systems

The 3/8" x 2-1/2" black steel nipple is a Schedule 40 threaded pipe fitting manufactured for use in systems requiring high mechanical strength and reliable threading integrity. Constructed from seamless black steel, this nipple is designed for applications involving air, oil, steam, and gas transport in both commercial and industrial piping systems.

Threaded on both ends to ANSI/ASME B1.20.1 standards, this fitting offers precise engagement with compatible female-threaded pipe and fittings. The black finish provides a clean surface suitable for oil- and gas-based system environments where galvanized coatings are not recommended. Not for potable water use due to the untreated internal surface.

Product Features

• ✅ Schedule 40 Wall Thickness – Supports operating pressures up to 150 psi in standard service conditions.
• ✅ Carbon Steel Construction – Hot-rolled, seamless pipe delivers superior tensile strength and heat resistance.
• ✅ NPT Tapered Threads – Precision-machined ends provide a secure, tight seal with proper thread sealant.
• ✅ Temperature Rating – Suitable for systems up to 650°F, depending on pressure and media type.
• ✅ Corrosion-Resistant Surface – Coated with a light protective oil for storage and transport; ideal for gas-line use where zinc plating is restricted.

Technical Specifications

• Size: 3/8 inch nominal diameter
• Length: 2-1/2 inches overall
• Material: ASTM A53/A106 black carbon steel
• Connection Type: NPT (National Pipe Thread) Male x Male
• Compliance: Threads conform to ANSI/ASME B1.20.1; pipe conforms to ASTM specifications for pressure piping

Typical Applications

Commonly used in gas distribution lines, compressed air systems, steam condensate return loops, and oil transfer lines. Its compact length and pressure rating make it ideal for installation in mechanical rooms, industrial process piping, and HVAC support systems requiring short run extensions or close nipple spacing between components.

Installation Guidelines

Apply appropriate pipe thread compound or PTFE tape to male threads. Thread into mating fitting with a pipe wrench until hand-tight, then apply additional torque as needed for a leak-free seal. Do not overtighten, which may crack female threaded components. Confirm all installations meet local plumbing or mechanical code requirements for black steel in fuel gas systems.

Note:

Not suitable for potable water systems. Use galvanized or approved materials when corrosion from water exposure is a concern.