Parker 2 P5ON-S Hex Plug 5/16-24 Male Thread O-ring

Product Description

The PARKER 2 P5ON-S is an industrial hex plug designed to seal hydraulic and pneumatic lines using a male straight thread O-ring connection. It features a 5/16-24 UN/UNF-2A male thread and is rated to 7,500 psi maximum working pressure, making it suitable for demanding fluid power applications. The zinc-plated steel construction provides corrosion resistance in typical shop and field environments. This fitting is installed by hydraulic technicians, millwrights, and fluid power service professionals to cap off ports, block unused lines, or facilitate system pressure testing.

This hex plug is used in industrial hydraulic and pneumatic systems where a compact, high-pressure port closure is required. The male straight thread O-ring configuration provides a positive, leak-resistant seal against a recessed O-ring boss port, which is common in hydraulic manifolds, cylinders, pumps, and valve bodies found in both mobile and stationary equipment. It is a standard catalog item conforming to SAE 090109A, suitable for general-purpose fluid power plumbing in industrial and mobile machinery applications.

Key Features

• 7,500 psi maximum working pressure for high-pressure hydraulic service
• 5/16-24 UN/UNF-2A male straight thread O-ring connection for leak-resistant port sealing
• Zinc-plated steel construction for corrosion resistance in industrial environments
• Hex drive design — 7/16-inch hex size — allows installation and removal with standard wrenches
• Compact overall length of 0.625 inches suits tight-clearance manifold and valve body ports
• Conforms to SAE 090109A standard for consistent fitment in SAE O-ring boss applications

Compatibility

Designed as an OEM-style replacement and standard-stock hex plug for SAE O-ring boss ports accepting a 5/16-24 male straight thread fitting in hydraulic and pneumatic fluid power systems.

Installation Notes

Installation and removal should be performed by a qualified hydraulic or fluid power technician. Always depressurize and bleed down the system completely before removing or installing any plug or fitting. Use a properly sized open-end or box wrench on the 7/16-inch hex — do not use pliers or pipe wrenches, as they can damage the hex or fitting body. Verify the O-ring is properly seated and in good condition before torquing the plug into the port.