Parker 41FS-8 Brass Flared Short Nut 1/2 in Od 45 Degree

Product Description

The PARKER 41FS-8 is a brass short nut designed for 45-degree flared tube connections in refrigeration, HVAC, and fluid-system plumbing applications. It accepts a 1/2-inch tube OD and threads onto a 3/4-16 UNF male fitting to secure a flared tube end against a mating seat. The short-body design saves axial space in tight assemblies where a standard-length nut would interfere. Rated to 750 psi maximum working pressure and 250 degrees F, it suits a wide range of system pressures encountered in commercial and residential service work. HVAC technicians, plumbers, and refrigeration mechanics are the primary installers.

This nut is used wherever 45-degree SAE flare connections appear: refrigerant line sets, fuel-gas distribution, hydraulic tubing, and general fluid-handling systems. It is well-suited to residential and light-commercial HVAC installations, appliance connections, and OEM equipment assemblies requiring compact flare hardware. The 3/4-16 UNF thread is a standard SAE size, making this nut compatible with the broad range of fittings manufactured to SAE J512 and SAE J513 specifications.

Key Features

• 45-degree flare end connection conforms to SAE J512 and SAE J513 standards
• 3/4-16 UNF thread for secure, leak-resistant engagement on mating male fittings
• Brass construction provides corrosion resistance and good workability in the field
• Short-body design fits tight or space-constrained plumbing layouts
• Rated to 750 psi and 250 degrees F for demanding service conditions
• UL Listed; meets SAE J512, SAE J513, and UNF thread standards

Compatibility

Designed for use with 1/2-inch OD tubing cut and flared to a 45-degree SAE flare angle. Compatible with male flare fittings threaded to 3/4-16 UNF per SAE J512 and SAE J513. Suitable for refrigerant, fuel-gas, and general fluid service within the rated pressure and temperature limits.

Installation Notes

Installation is typically performed by licensed HVAC technicians, refrigeration mechanics, or plumbers. Always depressurize and evacuate the system before disassembling or assembling flare fittings. Ensure the tube end is cut square, deburred, and properly flared before threading on the nut; an improperly formed flare is a common source of leaks. Follow applicable codes, including ASHRAE 15 for refrigerant systems and IFGC for gas piping, and verify joint integrity with an appropriate leak-detection method after pressurizing.