Eaton FF2138-06S Hex Socket Plug 3/8 in Male Thread

Product Description

The EATON FF2138-06S is a straight hex socket plug designed for industrial hydraulic and fluid system applications. This male straight thread O-ring fitting provides a reliable, leak-resistant seal in high-pressure lines, making it a standard choice for capping or terminating ports in hydraulic manifolds, cylinders, and plumbing circuits. Rated to a maximum working pressure of 4,000 psi with a burst pressure rating of 6,000 psi, the FF2138-06S is built for demanding service conditions. Its 3/8 inch male straight thread O-ring connection conforms to SAE standard 090109B, ensuring consistent fitment and sealing performance in properly prepared port faces.

This plug is suited for industrial hydraulic systems, mobile equipment, and fluid power installations where a dependable port closure is required. The straight fitting shape allows direct installation into straight-thread O-ring boss ports. It is commonly installed during system assembly, maintenance, or testing to isolate or cap hydraulic circuits. The working temperature range of -40 degrees F to 250 degrees F makes it appropriate for a wide range of operating environments, from cold-start mobile equipment to heated industrial hydraulic systems.

Key Features

• Male straight thread O-ring connection provides a positive, leak-resistant seal at the port face
• Maximum working pressure of 4,000 psi with a 6,000 psi pressure rating
• 3/8 inch male thread size fits standard straight-thread O-ring boss ports
• Conforms to SAE standard 090109B for consistent industry fitment
• Operating temperature range of -40 degrees F to 250 degrees F
• Straight hex socket drive for installation with standard hex tools

Compatibility

Designed as an OEM-style replacement or service fitting for industrial hydraulic and fluid power systems using 3/8 inch male straight thread O-ring boss ports conforming to SAE 090109B standards.

Installation Notes

Installation should be performed by a qualified hydraulic technician or pipefitter. Depressurize and isolate the hydraulic circuit completely before removing or installing any fittings. Verify the O-ring is properly seated and in good condition before torquing the plug into the port. Follow applicable SAE and system manufacturer torque guidelines for straight thread O-ring fittings to avoid port thread damage.