Parker PT-00391 Steel Flared Tube Nut 1/4 in 37 Degree

Product Description

The PARKER PT-00391 is a steel flared tube nut designed for use with 1/4 inch outside diameter tubing and a 37-degree flare angle. This fitting nut provides the mechanical connection that secures a flared tube end against a mating flare fitting seat, creating a leak-resistant joint in high-pressure fluid and gas lines. Rated to 7500 psi maximum working pressure and a maximum working temperature of 500 degrees F, this nut is suited for demanding hydraulic, refrigeration, and instrumentation applications. Licensed HVAC technicians, plumbers, and hydraulic system installers typically work with this component.

This tube nut is used wherever 37-degree JIC or SAE flare connections are required. Common installation scenarios include hydraulic lines, refrigerant tubing, fuel lines, and instrumentation tubing in both commercial and industrial settings. The 37-degree flare angle conforms to SAE J514 and ISO 8434-2 standards, making it appropriate for systems that require standardized, pressure-rated flare fittings. It is packaged in quantities of 5 per pack.

Key Features

• 37-degree flare angle conforms to SAE J514, SAE 070118, SAE 080118, and ISO 8434-2 standards
• Maximum working pressure of 7500 psi for high-pressure line applications
• Maximum working temperature of 500 degrees F (260 degrees C)
• Steel construction for durability in hydraulic and refrigerant service
• 1/4 inch tube OD sizing for standard small-diameter tubing
• Packaged in quantities of 5 per pack

Compatibility

Designed as an OEM-style replacement or service component for systems using 37-degree JIC flare tube connections with 1/4 inch outside diameter tubing, conforming to SAE J514 and ISO 8434-2 specifications.

Installation Notes

Installation is typically performed by licensed HVAC technicians, hydraulic system technicians, or plumbers. Always depressurize and isolate the line before disassembling or assembling flare fittings. Ensure the tube end is properly flared to the correct 37-degree angle using a calibrated flaring tool before torquing the nut. Refer to the applicable system service documentation and standards such as SAE J514 for proper assembly procedures.