3 Inch x Close Black Steel Nipple – Threaded Pipe Connector
The 3 Inch x Close Black Steel Nipple is a precision-machined fitting used to connect two female threaded components in high-pressure systems. Designed with minimal length for compact installations, it provides a dependable solution for joining black steel piping in gas, oil, and hydronic applications.
Product Specifications
- Nominal Size: 3 Inch
- End Type: Male Threaded (NPT) x Male Threaded (NPT)
- Length: Close (threaded end-to-end with no unthreaded space between)
- Material: Schedule 40 Black Steel conforming to ASTM A53 or A106
- Pressure Rating: Suitable for use in systems up to 150 psi, depending on application and sealing method
- Thread Type: ANSI/ASME B1.20.1 NPT
Application and Usage
This black steel nipple is commonly used in:
- Natural gas and LP gas piping systems
- Steam and hydronic heating systems
- Industrial air and oil lines
- Fire protection and sprinkler systems (non-potable)
Installation Considerations
Proper installation requires the use of compatible thread sealants or PTFE tape to achieve a leak-proof connection. Tighten using a pipe wrench; over-tightening may damage threads or fittings. Always confirm compatibility with system pressure and code requirements before use.
Key Performance Features
- Close Design: Ideal for tight spaces requiring minimal fitting length
- Machined Threads: Precision threading ensures secure mechanical engagement
- Corrosion-Resistant Coating: Black oxide finish enhances surface durability in dry systems
Compliance and Standards
- Manufactured in accordance with ASTM A733 (nipple specifications)
- Threaded to NPT standards (ANSI/ASME B1.20.1)
- Meets requirements for non-potable piping in commercial and industrial systems
The 3 Inch x Close Black Steel Nipple provides a rugged and efficient solution for high-pressure applications where space constraints demand compact fittings. Built for strength and long-term performance, it supports reliable fluid and gas transport in demanding environments.
