Parker 661FHD-6-8 Brass Male to Female Flare Fitting

Product Description

The PARKER 661FHD-6-8 is a brass male-flare to female-flare tube fitting designed for use in refrigeration, HVAC, and fluid-handling systems where a 45-degree SAE flare connection is required. It transitions between a 3/8-inch OD tube on the male end and a 1/2-inch OD tube on the female end, with a primary thread size of 3/4-16 UNF and a reduced thread size of 5/8-18. Rated to 1000 psi maximum working pressure and 250 degrees F, this fitting handles the demands of typical refrigerant and fuel-gas line work. HVAC technicians and refrigeration mechanics install this part when connecting or adapting flared tubing runs of different sizes.

This fitting is used in residential and light commercial HVAC, refrigeration, and plumbing applications where SAE 45-degree flare connections are the specified joint type. It is suited for use in refrigerant lines, fuel-gas tubing, and hydraulic lines that fall within its pressure and temperature ratings. The flare-by-flare end configuration allows it to serve as a union-style adapter between two flared tube ends of differing outside diameters without requiring soldering or brazing.

Key Features

• 45-degree SAE flare angle on both ends, conforming to SAE J512 and SAE J513 standards
• Brass construction provides corrosion resistance and reliable sealing in refrigerant and fuel-gas service
• Reduces from 3/4-16 UNF (3/8-inch OD tube) male flare to 5/8-18 UNF (1/2-inch OD tube) female flare
• Rated to 1000 psi maximum working pressure
• Maximum working temperature of 250 degrees F (121 degrees C)
• UL Listed; meets SAE J512 and SAE J513 standards

Compatibility

Designed as an OEM-style replacement or service fitting for systems using SAE 45-degree flare tube connections with 3/8-inch and 1/2-inch OD tubing.

Installation Notes

This fitting is installed by licensed HVAC technicians or refrigeration mechanics. Always recover refrigerant and de-pressurize the system before disconnecting or installing flare fittings. Use a calibrated flare tool to ensure proper flare geometry before tightening; an improperly formed flare is the most common cause of joint leaks. Do not over-tighten brass flare fittings, as this can crack the flare seat; follow the torque guidance in SAE J512 for the applicable tube size.