Parker 166FSV-4-4 Brass 90 Deg Flare Swivel Nut Elbow

Product Description

The PARKER 166FSV-4-4 is a brass 90-degree flared tube swivel nut elbow designed for use in refrigeration, HVAC, and hydraulic tubing systems. It accepts a 1/4-inch tube OD on the flare end and uses a 7/16-20 UNF swivel nut thread on the mating end. The swivel nut design allows the fitting to rotate freely during installation, reducing torsional stress on the tubing and simplifying alignment in tight spaces. Rated to 1,400 psi maximum working pressure and 250 degrees F, this fitting is built for demanding service environments where a reliable, leak-free 90-degree direction change is required. Brass construction provides corrosion resistance and compatibility with common refrigerant and hydraulic fluid lines.

This fitting is used in residential and light commercial HVAC systems, refrigeration equipment, and hydraulic tubing assemblies wherever a 90-degree flare-to-swivel transition is needed. Typical applications include refrigerant line routing, fuel system connections, and any tubing run requiring a right-angle change of direction with a standard SAE 45-degree flare interface. It is installed by HVAC technicians, refrigeration mechanics, and hydraulic system assemblers working with 1/4-inch OD flared tubing.

Key Features

• 90-degree swivel nut elbow allows free rotation during torque-up, reducing tube twist
• 1/4-inch tube OD flare end with 7/16-20 UNF swivel nut thread
• Rated to 1,400 psi maximum working pressure
• Maximum working temperature of 250 degrees F (121 degrees C)
• Brass construction resists corrosion in refrigerant and hydraulic fluid service
• Meets SAE J512, SAE J513, and UL Listing standards

Compatibility

Designed as an OEM-style replacement or new-installation fitting for systems using 1/4-inch OD SAE 45-degree flared tubing with 7/16-20 UNF threaded connections, in accordance with SAE J512 and SAE J513 standards.

Installation Notes

Installation should be performed by a qualified HVAC technician or refrigeration mechanic. Before servicing any refrigerant or hydraulic line, depressurize and recover the system fluid per applicable safety codes. Use a flare nut wrench to avoid rounding the swivel nut, and confirm the tube end is properly flared before final assembly. Do not overtighten; refer to fitting manufacturer torque guidelines for SAE flare fittings in the applicable service documentation.