Eaton 900598-4S Hex Plug 1/4 in Male Thread O-ring Fitting

Product Description

The EATON 900598-4S is a male straight thread O-ring hex plug designed for hydraulic and industrial fluid systems. It provides a reliable, leak-resistant seal by compressing an O-ring against a machined seat rather than relying on thread interference alone. The plug accepts a 1/4 inch male straight thread and is rated for a maximum working pressure of 4500 psi with a burst pressure rating of 6000 psi. It is sized and configured for applications where a port or line must be capped off cleanly without introducing leak paths. Licensed plumbers, pipefitters, and hydraulic system technicians working on industrial or mobile hydraulic circuits are the primary installers.

This hex plug is suited for industrial hydraulic systems, fluid power circuits, and high-pressure plumbing where straight thread O-ring port connections are specified. The straight thread O-ring design meets SAE standard 090109A, making it appropriate for OEM equipment builds, maintenance replacement, and hydraulic circuit modifications in both stationary and mobile applications. It is rated for service across a wide temperature range, from -40 degrees F to 250 degrees F, covering most industrial and mobile hydraulic operating environments.

Key Features

• 1/4 inch male straight thread O-ring connection for leak-resistant port sealing
• Maximum working pressure of 4500 psi for demanding hydraulic service
• Pressure rating of 6000 psi
• Operating temperature range of -40 degrees F to 250 degrees F
• Hex drive configuration allows installation and removal with standard wrenches
• Meets SAE 090109A standard

Compatibility

Designed as an OEM-style replacement or service fitting for hydraulic and industrial fluid power systems utilizing 1/4 inch male straight thread O-ring ports conforming to SAE 090109A.

Installation Notes

Installation is typically performed by qualified hydraulic technicians or licensed pipefitters. Depressurize and isolate the hydraulic circuit fully before removing or installing any fittings. Use an appropriately sized hex wrench or socket to seat the fitting without overtightening, which can damage the O-ring and compromise the seal. Inspect the O-ring for nicks or displacement before pressurizing the system.