Parker 41FL-4 Brass Flared Tube Long Nut 1/4 in Od

Product Description

The PARKER 41FL-4 is a brass long nut designed for 45-degree flared tube connections in refrigeration, HVAC, and fluid-handling systems. It threads onto a mating flare fitting to secure a flared tube end, creating a leak-resistant mechanical seal without the need for solder or thread sealant. The 41FL-4 features a 7/16-20 UNF thread and accepts 1/4-inch OD tubing with a standard 45-degree SAE flare. Rated to 1400 psi maximum working pressure and 250 degrees F, it suits a wide range of gas, refrigerant, and hydraulic-line applications. Licensed HVAC technicians and plumbers install this fitting as a standard component in flare-connection assemblies.

The 41FL-4 is used in residential and light commercial HVAC systems, refrigeration lines, and compressed-air or fluid distribution systems where 1/4-inch OD copper or aluminum tubing is flared to a 45-degree SAE angle. It is appropriate for applications governed by SAE J512 and SAE J513 standards and carries a UL Listing. Technicians reach for this nut when assembling or repairing flare fittings on suction and liquid lines, gauge manifold connections, and similar small-diameter tube runs.

Key Features

• Brass construction for corrosion resistance in refrigerant and fluid-line service
• 45-degree SAE flare end connection per SAE J512 and SAE J513
• 7/16-20 UNF thread for positive, leak-resistant engagement
• Rated to 1400 psi maximum working pressure
• Temperature range up to 250 degrees F (121 degrees C)
• UL Listed; meets SAE J512, SAE J513, and UNF thread standards

Compatibility

Designed as an OEM-style flare long nut for 1/4-inch OD tubing with a 45-degree SAE flare angle, compatible with standard 7/16-20 UNF flare fittings used in HVAC, refrigeration, and fluid-line assemblies.

Installation Notes

Installation is performed by a licensed HVAC technician or journeyman plumber. Shut off and recover any refrigerant or depressurize the fluid line before disassembly. Use two wrenches when tightening flare nuts to prevent twisting the tubing. Ensure the tube end is properly flared to the correct 45-degree angle before threading the nut to avoid leaks or fitting damage.