Parker 8 HP5ON-S Hex Socket Plug 3/4-16 O-ring 6000 Psi

Product Description

The PARKER 8 HP5ON-S is a hex socket plug designed for industrial hydraulic and fluid power applications requiring a secure, leak-resistant end fitting. It uses a male straight thread O-ring connection to seal against a mating port face, eliminating reliance on thread deformation alone. Manufactured from zinc-plated steel, the plug carries a maximum working pressure rating of 6000 psi. The 5/16-inch hex drive and 5/8-inch overall length make it a compact, low-profile solution. This plug is installed by hydraulic technicians and mechanical tradespeople working on high-pressure fluid circuits, manifolds, and port blocks.

This plug is suited for closing unused ports on hydraulic cylinders, valves, manifolds, and fluid power components in industrial and mobile equipment. The male straight thread O-ring configuration conforms to SAE standard 090109B and the UN/UNF-2A thread standard, making it a common choice for port plugging on equipment that demands a pressure-rated, vibration-resistant seal. It is appropriate for use in both stationary industrial machinery and mobile hydraulic systems where port integrity is critical.

Key Features

• 6000 psi maximum working pressure for high-pressure hydraulic circuits
• Male straight thread O-ring connection provides a positive face seal at the port
• Zinc-plated steel construction offers corrosion resistance in industrial environments
• Compact 5/8-inch overall length minimizes protrusion from the port face
• 5/16-inch hex socket drive for installation with standard hex keys
• Conforms to SAE 090109B and UN/UNF-2A thread standards

Compatibility

Designed as an OEM-style replacement or service plug for hydraulic and fluid power components using 3/4-16 male straight thread O-ring ports conforming to SAE 090109B specifications.

Installation Notes

Installation and removal should be performed by a qualified hydraulic technician or mechanic. Depressurize the hydraulic circuit completely and relieve all stored pressure before removing or installing any port plug. Use the correct 5/16-inch hex key to avoid rounding the socket drive. Inspect and replace the O-ring if it shows any sign of damage, flattening, or degradation before re-installing the plug.