Parker 4-1/4 F5OG-S Pipe Adapter 7/16-20 Male 1/4 Female Nptf

Product Description

The PARKER 4-1/4 F5OG-S is a straight hydraulic pipe adapter designed to connect a 7/16-20 male straight thread O-ring (MSTO) fitting to a 1/4 inch female NPTF port. Constructed from zinc-plated steel, it carries a maximum working pressure rating of 6,000 psi, making it suitable for high-pressure hydraulic lines in industrial and mobile equipment applications. The O-ring face seal on the male end provides a leak-resistant connection, while the female NPTF thread creates a pressure-tight mechanical seal without requiring sealant tape in most installations. This adapter is installed by hydraulic technicians, millwrights, and fluid power specialists during system assembly or line repair.

This adapter fits into hydraulic systems where a straight thread O-ring boss port must transition to a female NPTF pipe thread connection. Common applications include mobile hydraulic equipment, industrial machinery, and fluid power circuits operating at high pressure. It is suited for both OEM assembly lines and field repair work where a compact, inline straight adapter is needed to bridge two different thread standards within a tight plumbing layout.

Key Features

• 6,000 psi maximum working pressure rating for high-pressure hydraulic service
• Male straight thread O-ring connection provides reliable, leak-resistant seal
• Female NPTF thread conforms to SAE 090156 standard for pressure-tight pipe connections
• Zinc-plated steel construction resists corrosion in industrial environments
• Straight fitting shape simplifies inline plumbing without angular offset
• 3/4 inch hex size allows installation with standard open-end or combination wrenches

Compatibility

Designed as a direct-fit adapter for hydraulic systems requiring a 7/16-20 male straight thread O-ring to 1/4 inch female NPTF transition in straight inline orientation.

Installation Notes

Installation should be performed by a qualified hydraulic technician or fluid power specialist. Depressurize and isolate the hydraulic circuit fully before removing or installing any fittings. Inspect the O-ring for damage before assembly and replace it if any cuts or deformation are present. Torque the fitting using the hex flats only — do not grip the body — and verify the system for leaks at operating pressure before returning equipment to service.