Eaton 900599-4S Steel Flared Tube Plug 1/4 in Od 37 Deg

Product Description

The EATON 900599-4S is a steel flared tube plug designed to seal hydraulic and fluid-system tubing at a 37-degree flare angle. It threads into a 7/16-20 SAE-standard port and caps off a 1/4-inch OD tube line. The plug is rated to 4500 psi maximum working pressure and handles fluid temperatures from -40 degrees F to 250 degrees F. At 0.8 inches overall length and 0.03 pounds, it is a compact, single-piece fitting used to cap unused ports or dead-end tubing runs during service, repair, or system modification. Licensed plumbers, hydraulic technicians, and fluid-power mechanics are the typical installers.

This plug is suited for hydraulic systems, pneumatic lines, fuel systems, and other fluid-power applications where a 37-degree SAE flare port requires sealing. It is commonly used during system commissioning to cap unused branch ports, during repairs to isolate a circuit, or as a permanent seal on a capped-off line. The SAE 070109 standard compliance makes it appropriate for industrial, mobile hydraulic, and HVAC refrigerant-line applications where 37-degree JIC or SAE flare fittings are standard.

Key Features

• 4500 psi maximum working pressure for demanding hydraulic and fluid-power circuits
• 37-degree flare angle per SAE 070109 standard
• 7/16-20 SAE thread for secure, leak-resistant seating
• Steel construction for durability in high-pressure service
• Rated from -40 degrees F to 250 degrees F operating temperature range
• Compact at 0.8 inches overall length and 0.03 pounds

Compatibility

Designed as an OEM-style replacement or service fitting for fluid-power and hydraulic systems using 37-degree SAE flare connections with a 1/4-inch OD tube and 7/16-20 thread port.

Installation Notes

Installation is performed by licensed hydraulic technicians, plumbers, or fluid-power mechanics. Depressurize and fully isolate the system before removing any existing fitting or installing this plug. Use appropriate flare-fitting wrenches to avoid distorting the seating surface. Verify thread engagement and seat contact before returning the system to service pressure.