Midland Industries 704048-0504 Flare Half Union Adapter

Product Description

The MIDLAND INDUSTRIES 704048-0504 is a SAE 45-degree flare half union adapter machined from lead-free brass. It connects a 5/16-inch male flared end to a 1/4-inch male NPTF port, bridging flare tubing systems to threaded pipe connections in a single compact fitting. Thread sizing is 1/2-20 on the flare side and 1/4-18 NPTF on the pipe side. The fitting is rated for service from -40 to 250 degrees F, making it suitable for refrigerant, fuel, and hydraulic line work. Plumbers, HVAC technicians, and refrigeration mechanics typically install this type of adapter when joining flare tubing to a threaded component or manifold port.

This adapter is appropriate for residential and light commercial applications wherever a SAE 45-degree flare tubing run must terminate at a male NPTF fitting. It is compatible with copper, brass, aluminum, and steel tubing. Typical install scenarios include refrigerant line connections, fuel delivery systems, and hydraulic circuits that require a transition from a flared tube end to a pipe-thread port. The compact profile - under 1.5 inches in overall height - allows installation in tight spaces.

Key Features

• SAE 45-degree flare connection on one end for secure, leak-resistant tube seating
• Male NPTF thread on the pipe side provides a pressure-tight mechanical seal without sealant tape when mated to a compatible NPTF port
• Lead-free brass construction meets lead-free compliance requirements for potable and non-potable fluid systems
• Rated from -40 to 250 degrees F for broad service range across refrigerant, fuel, and hydraulic applications
• Compatible with copper, brass, aluminum, and steel tubing
• Compact dimensions suit installations with limited clearance

Compatibility

Designed for use with copper, brass, aluminum, and steel tubing in SAE 45-degree flare systems requiring a 5/16-inch male flared by 1/4-inch male NPTF connection.

Installation Notes

This fitting is installed by licensed plumbers, HVAC technicians, and refrigeration mechanics. Depressurize and isolate the system fully before removing or installing any flare fitting. The flare side requires a properly flared tube end seated squarely against the fitting cone - do not overtighten or cross-thread the flare nut. Verify NPTF thread engagement on the pipe side is sufficient to achieve a pressure-tight seal before returning the system to service.