Midland Industries 65771H Half Merchant Coupling 1/4 in

Product Description

The MIDLAND INDUSTRIES 65771H is a half merchant coupling designed to connect a female pipe thread (FPT) end to a butt weld end in a single compact fitting. Built from black steel and rated at 150 pounds per square inch (psi) in the malleable fittings class, this coupling serves as a transition point between threaded pipe runs and welded connections. The 1/4 in FPT side conforms to ANSI B1.20.1 thread standards with a 1/4-18 thread form. At 0.03 pounds and a footprint of 0.65 x 0.65 inches with a 0.5 inch height, this fitting is compact enough for tight installations in low-volume gas, air, or fluid distribution lines.

This half merchant coupling is suited for use in residential and light commercial piping systems where a threaded pipe needs to terminate into a welded assembly. Typical applications include black iron gas piping, compressed air distribution, and industrial fluid lines where a weld-end transition is required. The black finish and 150 psi malleable iron class rating make it a standard choice in gas distribution and mechanical room rough-in work.

Key Features

• 1/4 in FPT x 1/4 in butt weld configuration for thread-to-weld transitions
• Conforms to ANSI B1.20.1 dimensional and thread standards
• 1/4-18 thread form for consistent sealing with standard pipe fittings
• Black steel construction rated for 150 psi malleable fittings service
• Compact dimensions at 0.65 x 0.65 x 0.5 inches for use in confined spaces

Compatibility

Designed as an OEM-style replacement or new-installation fitting for black iron 150 psi malleable pipe systems using 1/4 in threaded and butt weld connections.

Installation Notes

This fitting is installed by licensed plumbers, pipefitters, or mechanical contractors working on gas or fluid distribution systems. Shut off and depressurize the line completely before installing or replacing any threaded or weld-end fitting. The FPT side requires appropriate thread sealant rated for the service medium; consult local codes and the International Fuel Gas Code (IFGC) or International Plumbing Code (IPC) for sealant requirements on gas service. The butt weld end must be welded by a qualified welder in accordance with applicable codes before the system is returned to service.