Eaton 900598-8S Hex Plug 1/2 in Male Thread O-ring Fitting

Product Description

The EATON 900598-8S is a straight-configuration hex plug designed for hydraulic and fluid power systems requiring a reliable male straight thread O-ring port closure. With a 1/2 inch male thread and a maximum working pressure rating of 4000 psi, this plug is built to seal high-pressure circuits in demanding industrial and mobile hydraulic applications. Burst pressure tolerance is rated to 6000 psi. The O-ring face seal connection type provides a leak-free closure when properly torqued against a machined port, making it a dependable choice for maintenance and circuit isolation work performed by hydraulic technicians and fluid power specialists.

This hex plug is suited for use in industrial machinery, mobile equipment, and hydraulic power units where a straight-thread O-ring port plug is required. The straight fitting shape allows direct port installation without angled routing. Typical applications include capping unused ports on hydraulic manifolds, valves, cylinders, and pumps during service or system reconfiguration. The plug conforms to SAE 090109A standards, ensuring dimensional and performance compatibility with common SAE straight thread port designs found across industrial and off-highway equipment.

Key Features

• 1/2 inch male straight thread O-ring connection provides a leak-resistant hydraulic port seal
• Maximum working pressure of 4000 psi rated for high-pressure hydraulic circuits
• Burst pressure rating of 6000 psi adds a safety margin in pressure surge conditions
• Operating temperature range of -40 degrees F to 250 degrees F suits a wide range of hydraulic fluid environments
• Meets SAE 090109A standards for dimensional and performance consistency
• Compact hex plug form factor allows installation with a standard wrench in tight port locations

Compatibility

Designed as an OEM-style replacement or service fitting for hydraulic systems using SAE straight thread O-ring ports, consistent with the SAE 090109A standard.

Installation Notes

Installation is typically performed by licensed hydraulic technicians or fluid power mechanics. Depressurize and fully isolate the hydraulic circuit before removing or installing any port plug. A calibrated torque wrench should be used to seat the O-ring against the port face without over-tightening. Inspect the O-ring for damage or deformation before installation and replace it if any cuts or flattening are present.