Parker 16 P5ON-S Hex Plug 5500 Psi 1-5/16-12 Thread

Product Description

The PARKER 16 P5ON-S is a male straight thread O-ring hex plug designed to cap or close off hydraulic and fluid system ports. It features a 1-5/16-12 UN/UNF-2A male thread with an O-ring face seal connection that provides a reliable, leak-resistant closure under high-pressure conditions. Rated to 5,500 psi maximum working pressure and constructed from zinc-plated steel, this plug delivers both strength and corrosion resistance in demanding industrial environments. It is installed by hydraulic system technicians and industrial mechanics working on fluid power circuits, manifolds, and port closures.

This hex plug is suited for use in hydraulic systems, fluid power assemblies, and industrial piping circuits where unused ports must be sealed against pressure. The male straight thread O-ring connection style seats against a port boss to create a positive seal without relying on thread deformation alone, making it appropriate for applications where leak-free performance is critical. It is commonly installed on hydraulic manifolds, cylinders, pumps, and valves across both mobile and stationary equipment.

Key Features

• 5,500 psi maximum working pressure rating for demanding hydraulic applications
• 1-5/16-12 UN/UNF-2A male thread for precise, standards-compliant fit
• Male straight thread O-ring connection provides leak-resistant port closure without thread sealant
• Zinc-plated steel construction resists corrosion in industrial environments
• 1-1/2 inch hex size for standard wrench installation
• Meets SAE 090109A standards

Compatibility

Designed as an OEM-style replacement or service plug for hydraulic and fluid power systems using 1-5/16-12 UN/UNF-2A male straight thread O-ring ports rated to 5,500 psi.

Installation Notes

Installation should be performed by a qualified hydraulic technician or industrial mechanic. Depressurize and isolate the hydraulic circuit completely before removing or installing any fittings. A 1-1/2 inch wrench or socket is required to torque the hex plug; do not overtighten, as damage to the O-ring or port boss will compromise the seal. Inspect the O-ring for damage before installation and verify thread engagement is full and clean before applying system pressure.