Parker 41FS-4 Brass Flared Short Nut 1/4 in Od 45 Degree

Product Description

The PARKER 41FS-4 is a brass short nut designed for 45-degree flare tube fittings in refrigeration, HVAC, and fluid-system applications. It mates with 1/4-inch OD tubing using a 7/16-20 UNF thread and forms a leak-resistant connection through the standard 45-degree flare seat geometry. The nut measures 0.75 inches in overall length and is rated to 1,400 psi maximum working pressure with a maximum working temperature of 250 degrees F. Machined from brass, it resists corrosion in typical refrigerant and hydraulic service environments. HVAC technicians and plumbers use this fitting where a compact short-nut profile is required in tight spaces or close-coupled assemblies.

This short nut is used in residential and light commercial HVAC systems, refrigeration line sets, and hydraulic or pneumatic tubing assemblies wherever 45-degree SAE flare connections are specified. It is well-suited for copper tubing runs in refrigerant circuits, fuel-gas lines rated for flare fittings, and similar trade applications. The compact length makes it a common choice when standard-length nuts cannot clear adjacent components. Installers typically pair this nut with a matching flare body or union to complete the connection.

Key Features

• 45-degree flare seat geometry per SAE J512 and SAE J513 standards
• 1/4-inch tube OD with 7/16-20 UNF thread for positive engagement
• Rated to 1,400 psi maximum working pressure
• Maximum working temperature of 250 degrees F (121 degrees C)
• Short-nut profile at 0.75 inches overall length for tight-clearance installations
• Brass construction for corrosion resistance in refrigerant and fluid service
• UL Listed; meets SAE J512 and SAE J513 standards

Compatibility

Designed as an OEM-style replacement or service fitting for 45-degree SAE flare tube assemblies using 1/4-inch OD tubing and 7/16-20 UNF threaded connections in HVAC, refrigeration, and fluid-system applications.

Installation Notes

Installation is performed by licensed HVAC technicians or plumbers. Depressurize and isolate the tubing circuit completely before disconnecting or installing flare fittings. Ensure the tube end is properly flared to the correct 45-degree angle using a calibrated flaring tool before threading the nut; an improper flare will result in leaks. Tighten the nut to snug contact against the flare seat using a properly sized flare-nut wrench — do not over-torque brass fittings. Verify the connection is leak-free before returning the system to service.