1-1/4 inch Galvanized Iron Coupling Female x Female

1-1/4" Galvanized Malleable Iron Coupling – Threaded for Rigid Piping Applications

The 1-1/4" Galvanized Iron Coupling is a threaded, straight-line fitting used to join two lengths of male-threaded pipe in water, air, or low-pressure steam systems. Fabricated from malleable iron and hot-dip galvanized to ASTM A153 standards, it provides a reliable and corrosion-resistant solution for rigid piping systems.

Threaded to ASME B1.20.1 NPT specifications, this coupling ensures a tight mechanical seal when paired with standard Schedule 40 or Schedule 80 pipe. The hot-dip galvanized finish enhances durability and is suitable for indoor and outdoor installations where protection from moisture or mild chemicals is required.

Performance Advantages

• ✅ Galvanized Coating: Zinc coating offers superior corrosion resistance in non-potable water and compressed air systems.
• ✅ Threaded Ends: Female National Pipe Taper (NPT) threads on both ends ensure compatibility with standard threaded pipe.
• ✅ High-Strength Malleable Iron: Cast to withstand pressure and vibration in mechanical and plumbing applications.
• ✅ Close Tolerance Machining: Threads are machined to ensure consistent fit and reduce the need for adjustment during installation.
• ✅ Code-Compatible: Manufactured to meet applicable ANSI and ASTM standards for pressure-rated systems.

Product Specifications

• Nominal Size: 1-1/4 inch
• Material: Malleable iron with hot-dip galvanized finish
• Connection Type: FPT x FPT (NPT Threaded)
• Pressure Rating: 150 psi for steam, 300 psi for water, oil, or air
• Standards: Meets ASTM A197, ASME B16.3, ASTM A153

Installation Guidance

For optimal performance, apply PTFE thread sealant or approved pipe dope to male threads prior to tightening. Use appropriate wrenches to avoid overtightening and damaging the coupling threads. Confirm proper alignment and torque based on system pressure requirements.

Typical Applications

This coupling is frequently specified in systems including:

• Cold and hot water distribution lines
• Compressed air and vacuum systems
• Fire protection and sprinkler pipe networks (non-potable lines)
• Low-pressure steam and return condensate lines

Industry Insight

Galvanized malleable iron fittings have been a standard in mechanical trades for decades due to their performance in wet environments. They offer a balance of mechanical strength and corrosion resistance that’s ideal for commercial and light industrial use.

Use the 1-1/4" Galvanized Iron Coupling when your application calls for rugged durability, precise threading, and compatibility with existing galvanized or black iron systems. Engineered for the jobsite, it delivers the consistency professionals demand.