Parker 41FS-5 Brass Flared Tube Short Nut 5/16 in Od

Product Description

The PARKER 41FS-5 is a brass short nut designed for 45-degree flared tube connections in hydraulic, refrigeration, and fluid-conveyance systems. It features a 5/16-inch tube outside diameter, a 1/2-20 UNF thread size, and a 45-degree flare end connection. Rated to 1,200 psi maximum working pressure and 250 degrees F, this nut is built for demanding service environments. The brass construction offers good corrosion resistance and machinability. It meets SAE J512, SAE J513, and UL Listing standards. Licensed HVAC technicians, plumbers, and refrigeration mechanics install this fitting type during line-set assembly, equipment hookups, and fluid system repairs.

This short nut is used in residential and light commercial applications wherever 45-degree flare fittings are specified. Common install scenarios include refrigerant line connections, fuel line assemblies, and hydraulic tubing runs that require a compact, reliable threaded nut to secure the flared tube end against a mating fitting body. The short-body design is suited for tight-clearance installations where a standard-length nut would not fit. Consult system documentation to confirm tube OD, thread engagement length, and pressure rating requirements before installation.

Key Features

• 45-degree flare end connection per SAE J512 and SAE J513
• 1/2-20 UNF thread for secure, precise engagement
• Brass construction provides corrosion resistance in fluid and refrigerant service
• Rated to 1,200 psi maximum working pressure
• Rated to 250 degrees F maximum working temperature
• UL Listed; meets SAE J512, SAE J513 standards

Compatibility

Designed as an OEM-style replacement short nut for 45-degree flared tube assemblies using 5/16-inch OD tubing with 1/2-20 UNF threaded fittings per SAE J512 and SAE J513 specifications.

Installation Notes

Installation is typically performed by licensed HVAC technicians, refrigeration mechanics, or plumbers. De-energize and depressurize the system completely before disturbing any flare connections. Inspect the tube flare for cracks, ovality, or surface damage before threading the nut; a compromised flare will not seal properly regardless of torque applied. Follow SAE J512 torque guidelines for the applicable tube size and material — do not over-torque brass fittings.