Eaton FF2138-04S Hex Socket Plug 1/4 in Male Thread O-ring

Product Description

The EATON FF2138-04S is a straight hex socket plug fitting designed to seal and cap hydraulic or fluid power lines using a male straight thread O-ring connection. The 1/4 inch male thread size makes it suitable for compact port applications. Rated for a maximum working pressure of 4,500 psi and a burst pressure rating of 6,000 psi, this plug handles the demands of high-pressure industrial hydraulic systems. It is installed by licensed hydraulic technicians and fluid power specialists in commercial and industrial environments.

This fitting is used in industrial hydraulic systems where an unused port must be capped or a line must be terminated cleanly. The male straight thread O-ring connection provides a reliable, leak-resistant seal without the need for thread sealant tape. Typical install scenarios include manifold port plugging, valve body service, and hydraulic circuit modification. The straight fitting shape allows straightforward installation in tight or inline port locations. The working temperature range spans -40 degrees F to 250 degrees F, making it suitable for a wide range of operating environments.

Key Features

• Male straight thread O-ring connection provides a positive, leak-resistant seal at the port face
• 4,500 psi maximum working pressure suits high-pressure hydraulic circuit applications
• 6,000 psi pressure rating adds a safety margin above normal operating conditions
• Wide temperature range of -40 degrees F to 250 degrees F for varied industrial environments
• Hex socket drive allows installation and removal with standard hex key tooling in confined spaces
• Meets SAE 090109B standard for dimensional and performance compliance

Compatibility

Designed as an OEM-style replacement or service fitting for industrial hydraulic systems requiring a 1/4 inch male straight thread O-ring hex socket plug conforming to SAE 090109B.

Installation Notes

Installation should be performed by a qualified hydraulic technician or fluid power specialist. Depressurize and isolate the hydraulic circuit completely before removing or installing any fittings. Use a calibrated hex key or socket to seat the fitting properly without over-torquing the O-ring sealing surface. Do not use thread sealant tape with straight thread O-ring fittings, as the seal is made at the O-ring face, not the threads.