Eaton 131X5 Steel Inverted Flare Plug 5/16 in Od 1/2-20 Unf

Product Description

The EATON 131X5 is a steel inverted flare tube plug designed to cap or terminate a 5/16-inch OD flared tubing line. It uses a 45-degree flare seat and a 1/2-20 UNF thread to create a secure, leak-resistant seal in hydraulic, pneumatic, or fluid-transfer systems. Rated to 2000 psi maximum working pressure and 250 degrees F maximum working temperature, this plug is built for demanding service environments. The overall installed length is 0.59 inches, and the inside diameter measures 0.25 inches. Installation is typically performed by hydraulic technicians, plumbers, or fluid-system mechanics working on tubing assemblies that require a reliable dead-end fitting.

The 131X5 inverted flare plug is suited for use in hydraulic lines, brake and fuel systems, and other fluid-transfer assemblies that use 45-degree inverted flare tubing connections. It is commonly used during service when a line must be capped to isolate a circuit or prevent contamination. The steel construction makes it appropriate for high-pressure applications where brass or plastic fittings would be inadequate. This fitting meets ASA, ASME, MS, and SAE standards, making it suitable for use in both industrial and mobile equipment contexts.

Key Features

• 45-degree inverted flare seat matches standard inverted flare tubing ends
• 1/2-20 UNF thread for secure engagement with compatible fittings and ports
• Steel construction rated to 2000 psi maximum working pressure
• Operates up to 250 degrees F (121 degrees C)
• Compact overall length of 0.59 inches for tight-clearance installations
• Meets ASA, ASME, MS, and SAE 040109 standards

Compatibility

Designed as an OEM-style replacement or service fitting for 5/16-inch OD inverted flare tubing assemblies using 1/2-20 UNF threaded connections in hydraulic, pneumatic, and fluid-transfer systems.

Installation Notes

Depressurize and isolate the fluid circuit completely before removing or installing any flare fitting. Inspect the flare seat on the mating tubing end for damage or debris before threading the plug into place. Use appropriate wrenches to tighten to a snug fit without overtorquing the steel threads. Follow applicable system service procedures and relevant ASME or SAE guidelines for flare fitting assembly.