Parker 4 P5ON-S Hex Plug 7/16-20 Male Thread 7500 Psi

Product Description

The PARKER 4 P5ON-S is a hydraulic hex plug designed to seal and cap ported openings in hydraulic manifolds, valves, and fluid power systems. It uses a 7/16-20 UNF-2A male straight thread with an O-ring sealing interface, which provides leak-free closure without relying on thread engagement alone for sealing. Rated to 7,500 psi maximum working pressure, this plug is built for high-pressure hydraulic circuits. It is installed by licensed hydraulic system technicians and industrial maintenance professionals working on fluid power equipment.

This plug is suited for use in industrial hydraulic systems, mobile equipment, and fluid power assemblies where unused ports require high-integrity sealing. The male straight thread O-ring (MSTO) connection type is common in manifold blocks, cylinder ports, and valve bodies machined to SAE straight thread port specifications. The compact hex drive profile allows installation in tight-clearance port locations.

Key Features

• 7/16-20 UNF-2A male straight thread for positive port engagement
• O-ring face sealing eliminates reliance on thread deformation for leak prevention
• 7,500 psi maximum working pressure rating
• 9/16 inch hex size for standard wrench or socket installation
• 5/8 inch overall length for compact port fitment
• Meets SAE 090109A standard

Compatibility

Designed as an OEM-style replacement or service plug for hydraulic manifolds, valve bodies, and fluid power components machined to SAE straight thread O-ring port specifications accepting a 7/16-20 male thread fitting.

Installation Notes

Installation should be performed by a qualified hydraulic technician. Depressurize and isolate the hydraulic circuit fully before removing or installing any port plug. Inspect the O-ring for damage before installation and lubricate it lightly with clean system fluid. Do not overtighten; consult SAE torque guidelines for straight thread O-ring fittings of this thread size.