Parker 41FX-10 Brass Flared Tube Short Nut 5/8 in Od

Product Description

The PARKER 41FX-10 is a brass short nut designed for 45-degree flared tube connections in refrigeration, HVAC, and fluid system applications. It threads onto a 7/8-14 UNF male fitting and seats against a 45-degree flare to form a leak-resistant mechanical joint without solder or adhesive. Rated to 650 psi maximum working pressure and 250 degrees F maximum working temperature, this nut is suited for high-pressure lines where a reliable, serviceable connection is required. The brass construction resists corrosion and is compatible with a range of refrigerants and hydraulic fluids. HVAC technicians, plumbers, and refrigeration mechanics use this fitting when assembling or repairing flared-tube systems.

This short nut is used in residential and light commercial HVAC systems, refrigeration circuits, and hydraulic or pneumatic lines that use SAE 45-degree flare connections. It is commonly installed on copper tubing with a 5/8 inch outside diameter. The shorter body profile suits applications where clearance is limited. It meets SAE J512, SAE J513, and UL Listing standards, making it appropriate for regulated installations in both field service and OEM assembly contexts.

Key Features

• 45-degree flare end connection per SAE J512 and SAE J513
• 7/8-14 UNF thread for secure, standard engagement
• Brass construction provides corrosion resistance across common refrigerants and fluids
• 650 psi maximum working pressure for high-pressure line service
• 250 degrees F maximum working temperature (121 degrees C)
• UL Listed; meets SAE J512, SAE J513 standards

Compatibility

Designed as an OEM-style replacement or service fitting for flared-tube assemblies using 5/8 inch OD tubing with a 45-degree SAE flare and 7/8-14 UNF male fittings.

Installation Notes

Installation should be performed by a licensed HVAC technician, refrigeration mechanic, or plumber. Depressurize and evacuate the system before removing or installing any flare fitting. Ensure the tubing flare is properly formed and seated before torquing the nut to avoid distorting the flare face. Follow applicable SAE and local code requirements for flared-joint assembly; do not overtighten, as brass threads can be damaged by excessive force.