Eaton 900598-6S Hex Plug 3/8 in Male Thread O-ring Fitting

Product Description

The EATON 900598-6S is a straight hex plug fitting designed for industrial and hydraulic plumbing applications. It features a 3/8 inch male straight thread with an O-ring sealing connection, rated for a maximum working pressure of 4000 psi and a burst pressure rating of 6000 psi. The fitting operates across a wide temperature range, from -40 degrees F to 250 degrees F, making it suitable for demanding fluid power systems. It is installed by hydraulic technicians, industrial mechanics, and journeyman pipefitters working on high-pressure fluid circuits in mobile or stationary equipment.

This hex plug is used to cap or close off ports in hydraulic manifolds, cylinders, valves, and plumbing blocks where a straight thread O-ring port is present. Its straight-thread O-ring design provides a reliable, leak-resistant seal without relying on thread deformation, making it appropriate for high-pressure hydraulic systems in industrial machinery, mobile equipment, and fluid power installations. The compact hex body allows installation and removal with standard wrenches in tight-clearance environments.

Key Features

• 3/8 inch male straight thread O-ring connection for leak-resistant port sealing
• 4000 psi maximum working pressure with 6000 psi pressure rating
• Wide operating temperature range: -40 degrees F to 250 degrees F
• Hex body design for installation and removal with standard hand tools
• Straight fitting shape for direct port plug applications
• Meets SAE 090109A standards

Compatibility

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

Installation Notes

Installation should be performed by a qualified hydraulic technician or industrial pipefitter. Depressurize and bleed the hydraulic circuit fully before removing or installing any fitting. Ensure the O-ring is properly seated and lubricated before threading the plug into the port. Torque to the equipment manufacturer's specified value for the port size and fitting material.