Parker 8-3/8 F5OG-S Pipe Adapter 3/4-16 Male X 3/8 Female

Product Description

The PARKER 8-3/8 F5OG-S is a straight industrial pipe adapter designed to transition between a 3/4-16 Male Straight Thread O-Ring (STOR) connection and a 3/8 inch Female NPTF port. Rated to 6,000 psi maximum working pressure, this adapter is built for high-pressure hydraulic and fluid power systems where leak-free performance is critical. The male side uses an O-ring face seal design that compresses against the port face, eliminating reliance on thread deformation alone for sealing. Licensed plumbers, hydraulic technicians, and industrial maintenance professionals typically install this fitting in fluid power lines, hydraulic circuits, and industrial plumbing manifolds.

This adapter is suited for both stationary and mobile hydraulic applications where a rigid straight transition between mismatched thread standards is required. Typical installations include hydraulic power units, cylinders, valve bodies, and manifold blocks operating at elevated system pressures. The straight fitting shape keeps the connection inline, making it appropriate for tight plumbing layouts where angled or elbow fittings are not practical. The 7/8 inch hex size accepts a standard open-end or combination wrench for installation and removal.

Key Features

• 6,000 psi maximum working pressure rating for high-pressure hydraulic service
• Male Straight Thread O-Ring x Female NPTF connection eliminates reliance on thread-deformation sealing on the male side
• Straight fitting shape for inline plumbing configurations
• 3/4-16 male thread and 3/8 inch female NPTF thread sizes
• 7/8 inch hex for standard wrench installation
• Meets SAE 090156 standards

Compatibility

Designed as an OEM-style replacement or new-installation adapter for hydraulic and high-pressure fluid power systems requiring a Male Straight Thread O-Ring to Female NPTF transition fitting per SAE 090156.

Installation Notes

Installation should be performed by a qualified hydraulic technician or licensed plumber familiar with high-pressure fluid systems. Depressurize and isolate the hydraulic circuit completely before removing or installing any fittings. Apply thread sealant to the NPTF female side as appropriate for the fluid media and system requirements; the O-ring side seals mechanically and does not require thread sealant on the male end. Verify the O-ring is properly seated and undamaged before completing installation.