Parker 14FSX-6 Brass Flared Short Nut 3/8 in 5/8-18 Unf

Product Description

The PARKER 14FSX-6 is a forged brass short nut designed for 45-degree flare tube connections in fluid and refrigerant line assemblies. It accepts a 3/8-inch tube OD and threads onto a 5/8-18 UNF male fitting to create a leak-resistant mechanical joint at the flare seat. Rated to 1000 psi working pressure and 250 degrees F maximum working temperature, this fitting is built for demanding service in HVAC, refrigeration, and plumbing applications. The forged brass construction provides superior strength and corrosion resistance compared to cast alternatives. Licensed HVAC technicians, refrigeration mechanics, and plumbers routinely use this style of nut when assembling or servicing copper tubing systems.

This short nut is used in residential and light commercial HVAC and refrigeration systems wherever 45-degree SAE flare connections are required. It is well suited for connecting copper refrigerant lines, fuel oil lines, and hydraulic tubing. The compact overall length of 0.74 inches makes it appropriate for installations with tight clearance around flare fittings. It conforms to SAE J512 and SAE J513 flare fitting standards and carries a UL Listing, making it acceptable for installations governed by those specifications.

Key Features

• Forged brass construction for high strength and corrosion resistance
• 45-degree flare end connection, SAE J512 and SAE J513 compliant
• 3/8-inch tube OD with 5/8-18 UNF thread size
• Rated to 1000 psi maximum working pressure
• Rated to 250 degrees F maximum working temperature
• UL Listed; compact 0.74-inch overall length for tight-clearance installations

Compatibility

Designed as an OEM-style replacement or new-installation component for 45-degree SAE flare tube assemblies using 3/8-inch OD copper or compatible tubing with a 5/8-18 UNF male flare fitting counterpart.

Installation Notes

Installation is performed by licensed HVAC technicians, refrigeration mechanics, or plumbers. De-pressurize and evacuate the line set before disassembling any flare connection, and ensure the tube end is properly flared to 45 degrees using a quality flaring tool before threading the nut. Hand-tighten first, then use two wrenches to prevent twisting the tubing during final tightening. Installations involving refrigerant lines must comply with applicable EPA Section 608 requirements and local mechanical codes.