1-1/2 inch Black Iron Union Female x Female

1-1/2 inch Black Iron Union – For High-Integrity Pipe Connections

The 1-1/2 inch black iron union is designed to provide a secure, serviceable connection between two sections of threaded pipe in low- to medium-pressure systems. Manufactured from robust black malleable iron, this union supports mechanical disassembly, making it ideal for piping installations that require periodic maintenance or future modifications.

Its three-piece design includes two threaded female ends and a central nut, allowing for installation without the need to rotate joined pipe lengths. This makes it well-suited for applications where full pipe rotation is impractical or where space is limited.

Performance Features

• ✅ Material: ASTM A-197 black malleable iron for durability in mechanical and plumbing systems
• ✅ Connection Type: NPT (National Pipe Thread) female x female, providing a tight, standardized seal
• ✅ Pressure Rating: Suitable for up to 150 PSI non-shock for water, oil, or air service (WOG)
• ✅ Union Nut: Precision-machined center nut allows easy separation without disturbing the piping layout
• ✅ Seating Surface: Metal-to-metal or brass-to-iron seat depending on the model, ensuring reliable sealing

Installation Notes

Use an appropriate thread sealant, such as PTFE tape or pipe joint compound, on male threads to ensure leak-tight connections. Verify thread engagement is correct to prevent cross-threading or over-torqueing. Tighten the union nut to ensure a snug seat while allowing future disassembly without compromising the seal.

Applications

This fitting is commonly used in black iron piping systems for gas distribution, hydronic heating, and process lines where future disassembly may be required. It is especially useful in systems requiring rigid alignment or where movement due to thermal expansion needs to be minimized.

Code and Compliance

This union is produced in accordance with applicable ANSI and ASTM specifications and may be used in systems compliant with the International Plumbing Code (IPC) and Uniform Plumbing Code (UPC), depending on application and local regulations.

Specifications Summary

• Nominal Size: 1-1/2 inch
• Material: Black malleable iron (ASTM A-197)
• Connection: NPT Female x Female
• Configuration: Three-piece union with central nut
• Seat Type: Machined metal or brass seating surface

The 1-1/2 inch black iron union is a dependable solution for threaded piping assemblies that require future serviceability without disturbing existing pipe runs. Engineered for rugged environments and standard service conditions, this fitting delivers performance that meets the demands of field installations.