3 inch x 12 inch Black Steel Nipple

3" x 12" Black Steel Nipple – Threaded, Schedule 40

The 3" x 12" black steel nipple is a Schedule 40 pipe segment with male NPT threads on both ends. It is designed for use in systems requiring robust connections between female-threaded components. Commonly fabricated from ASTM A53 grade steel, this fitting supports a wide range of mechanical, gas, and hydronic piping systems.

This component is used in high-pressure and high-temperature service conditions, particularly in applications involving natural gas, steam, oil, and non-potable water. Its uncoated black finish makes it suitable for enclosed systems where corrosion from external moisture is not a concern.

Performance Characteristics

• ✅ Nominal Diameter: 3 inches; ideal for large-bore piping transitions.
• ✅ Length: 12 inches; used for extended connections between components.
• ✅ Threaded Ends: Machined NPT threads meet ANSI/ASME B1.20.1 specifications for sealing integrity and fit.
• ✅ Schedule 40 Wall Thickness: Provides structural integrity in medium to high-pressure environments.
• ✅ Material: Welded or seamless black steel per ASTM A53 or equivalent specification.

Installation Guidelines

Apply PTFE tape or pipe thread sealant to the male threads before installation. Use a pipe wrench on the unthreaded portion to tighten. Ensure proper alignment and avoid over-torquing. Suitable for use in systems adhering to local and national code requirements for fuel gas or mechanical piping.

Common Applications

This black steel nipple is typically installed in commercial and industrial gas lines, boiler systems, fire sprinkler installations, and hydronic heating loops. It is also used for branch connections and equipment tie-ins in process piping layouts.

Material and Usage Note

Black steel pipe and fittings are not recommended for potable water systems due to the potential for internal corrosion. They are, however, widely accepted in gas and oil system applications where oxidation control and high thermal stability are critical.

Technical Specifications

• Nominal Pipe Size: 3"
• Overall Length: 12"
• Connection Type: Male NPT x Male NPT
• Wall Type: Schedule 40
• Material: Black Steel (ASTM A53 or equivalent)
• Thread Standard: ANSI/ASME B1.20.1

The 3" x 12" black steel nipple is engineered for integration into threaded piping systems that require dependable performance under pressure. Its strength and precise threading make it an essential fitting for large-scale mechanical and fuel gas infrastructure.