Parker 41FL-6 Brass Flared Tube Long Nut 3/8 in 45 Degree

Product Description

The PARKER 41FL-6 is a brass flared tube long nut designed for use in flared tube fitting assemblies. It accepts 3/8-inch tube OD and features a 5/8-18 UNF thread, conforming to a 45-degree flare angle. The nut secures the flared end of a tube against a mating fitting seat, creating a leak-resistant mechanical connection. Rated to 1000 psi maximum working pressure and a maximum working temperature of 250 degrees F, this long nut suits hydraulic, refrigeration, fuel, and fluid power lines where a reliable flare connection is required. Licensed plumbers, HVAC technicians, and fluid power mechanics are the typical installers.

This fitting is used in residential and light commercial HVAC systems, refrigeration lines, fuel delivery systems, and hydraulic plumbing wherever a 45-degree SAE flare connection is specified. The long-nut configuration provides additional thread engagement and easier wrench access compared to a standard short nut, making it particularly useful in tight installations or where tubing must be repositioned during assembly. It is sold individually and is appropriate for new installation or field repair.

Key Features

• 45-degree SAE flare angle per SAE J512 and SAE J513
• 3/8-inch tube OD with 5/8-18 UNF thread
• 1000 psi maximum working pressure
• 250 degrees F maximum working temperature
• Brass construction for corrosion resistance in fluid and refrigerant service
• UL Listed; meets SAE J512 and SAE J513 standards

Compatibility

Designed for use with 45-degree flared tube fittings on 3/8-inch OD tubing using 5/8-18 UNF threaded connections per SAE J512 and SAE J513.

Installation Notes

Installation is typically performed by licensed HVAC technicians, plumbers, or fluid power mechanics. Depressurize and isolate the line before disassembly or fitting replacement. Use two wrenches when tightening flare nuts to avoid twisting the tubing. Do not over-torque brass fittings, as this can crack the flare seat; follow applicable SAE or system-specific torque guidelines from the equipment manufacturer.