Parker 660FHD-6 Brass Flared Tube Union 3/8 Inch 45 Degree

Product Description

The PARKER 660FHD-6 is a brass flared tube union fitting with female-to-female flare connections on both ends. It joins two flared tube lines in a straight union configuration using 45-degree SAE flare geometry and a 5/8-18 UNF thread size. The fitting accepts 3/8-inch outside diameter tubing and is rated for service up to 1000 psi and 250 degrees F. Constructed from brass, it offers reliable performance in refrigerant, fuel, and hydraulic line applications. Licensed plumbers, HVAC technicians, and refrigeration mechanics install this fitting type during line assembly and repair work where a union connection between two female flared tube ends is required.

This fitting is suited for use in residential and light commercial systems where SAE 45-degree flare connections are specified. Typical applications include refrigeration line sets, fuel oil lines, and hydraulic tubing assemblies. The union design allows technicians to join or disconnect two flared tube sections without cutting or reflaring. It conforms to SAE J512 and SAE J513 standards and carries a UL Listing, making it appropriate for systems requiring certified components.

Key Features

• Female-to-female flare ends accept 3/8-inch OD tubing on both sides
• 45-degree SAE flare angle per SAE J512 and SAE J513
• 5/8-18 UNF thread size for standard flare nut engagement
• Rated to 1000 psi maximum working pressure
• Rated to 250 degrees F maximum working temperature
• UL Listed construction in brass for corrosion resistance in fluid and refrigerant service

Compatibility

Designed as an OEM-style replacement or new-installation fitting for systems using SAE 45-degree flare connections with 3/8-inch OD tubing and 5/8-18 UNF threaded flare nuts.

Installation Notes

Installation is performed by licensed HVAC technicians, refrigeration mechanics, or plumbers depending on the application. De-pressurize and isolate the line before disconnecting or making up any flare connection. Ensure both mating tube ends are properly flared to a 45-degree angle before tightening; do not over-torque brass flare fittings. Follow applicable SAE, UL, and local mechanical code requirements for the specific system being serviced.