Parker 6-3/8 F5OG-S Pipe Adapter 9/16-18 Male X 3/8 Nptf Female

Product Description

The PARKER 6-3/8 F5OG-S is a straight hydraulic pipe adapter designed to connect a 9/16-18 male straight thread O-ring (MSTO) port to a 3/8 inch female NPTF port. Constructed from zinc-plated steel, this adapter is rated for a maximum working pressure of 6,000 psi, making it suitable for demanding hydraulic circuits found in industrial and mobile equipment. The male end seats against a port O-ring to provide a leak-free metal-to-metal seal, while the female NPTF end relies on thread interference for a pressure-tight connection. Licensed plumbers, hydraulic technicians, and fluid power specialists install this fitting type during system assembly and repair.

This adapter is used in hydraulic systems where a straight-thread O-ring boss port must transition to a female NPTF pipe thread connection. Typical applications include industrial machinery, mobile hydraulic equipment, and fluid power assemblies that operate at elevated pressures. The straight configuration keeps the plumbing layout compact and in-line. It is packaged and sold as an individual fitting.

Key Features

• 6,000 psi maximum working pressure suitable for high-pressure hydraulic service
• Male straight thread O-ring end provides a leak-free seal at the port face
• Female NPTF thread provides a pressure-tight pipe thread connection
• Zinc-plated steel construction resists corrosion in typical industrial environments
• Straight fitting shape keeps hydraulic lines compact and in-line
• Meets SAE 090156 standards for hydraulic fitting performance

Compatibility

Designed for use in hydraulic systems with 9/16-18 straight thread O-ring boss ports transitioning to 3/8 inch female NPTF pipe thread connections, conforming to SAE 090156 standards.

Installation Notes

Installation should be performed by a qualified hydraulic technician or fluid power specialist. Depressurize and isolate the hydraulic circuit completely before removing or installing any fittings. Inspect the O-ring for damage before assembly and ensure the port seat is clean and free of debris. Torque the fitting according to the equipment manufacturer's port specifications and do not over-tighten the NPTF end, as this can crack fittings or damage port threads.