1-1/2 inch x 5-1/2 inch Black Steel Nipple

1-1/2" x 5-1/2" Black Steel Nipple – Fabricated for High-Integrity Pipe Systems

This 1-1/2" x 5-1/2" black steel nipple is manufactured from welded Schedule 40 pipe and is designed for joining threaded steel pipe systems in pressure-rated applications. Its short length and durable carbon steel composition make it suitable for water, steam, air, and gas lines where heat resistance and mechanical strength are critical.

Each nipple is cut to specification and features precision NPT threading on both ends in accordance with ANSI B1.20.1 standards. The black oxide finish provides a basic level of corrosion resistance during storage and handling, and the fitting is intended for use in non-corrosive, closed piping systems or where protective coatings are externally applied.

Performance Features

• ✅ Full NPT Male Threads Machined to ensure accurate engagement and sealing with compatible female threaded components
• ✅ Carbon Steel Construction Delivers high tensile strength and durability for demanding pressure environments
• ✅ Schedule 40 Wall Thickness Standard for general purpose systems involving moderate pressure and temperature conditions
• ✅ Length Accuracy Nominal close-cut sizing supports layout precision in compact assemblies
• ✅ Threaded End Connection Simplifies field installation and system expansion or modification

Technical Specifications

• Material: ASTM A53 Grade A or equivalent carbon steel
• Nominal Pipe Size (NPS): 1-1/2 inch
• Length: 5-1/2 inches overall
• End Type: MNPT x MNPT
• Wall Schedule: Schedule 40
• Standards: Threads per ANSI/ASME B1.20.1

Installation Considerations

Ensure both male and female threads are clean prior to assembly. Thread sealant tape or pipe dope is recommended to achieve a pressure-tight joint. Use a pipe wrench on the hex flats or body section to avoid stress concentration at the threads. Not suitable for potable water unless coated or lined for compliance with NSF 61 and lead-free requirements.

Application Scope

Commonly deployed in hydronic heating loops, low-pressure steam distribution, compressed air systems, and gas supply lines. It is frequently used in equipment hookups, valve assemblies, and riser extensions requiring a rigid, short-length threaded connection.

Material Insight

Black steel pipe and nipples are widely utilized in industrial and mechanical piping due to their balance of strength, availability, and machinability. Although not internally galvanized, they perform well in dry, interior applications or systems with protective media.

For mechanical builds requiring a durable, pressure-capable connection in a compact form, the 1-1/2" x 5-1/2" black steel nipple delivers proven performance across a range of utility systems.