Parker 12-3/4 F5OG-S Pipe Adapter 4000 Psi Straight Thread O-ring

Product Description

The PARKER 12-3/4 F5OG-S is a straight hydraulic pipe adapter designed to connect a 1-1/16-12 male straight thread O-ring end to a 3/4 inch female NPTF port. Built from zinc-plated steel, it handles a maximum working pressure of 4000 psi, making it suitable for demanding hydraulic and fluid-power circuits. The straight body keeps the connection inline with no angular offset. This fitting is installed by hydraulic technicians, industrial maintenance mechanics, and fluid-power specialists during system assembly or repair. Its O-ring face seal on the male end provides a reliable, leak-resistant connection without relying solely on thread interference.

This adapter is used in industrial hydraulic systems, mobile equipment, and fluid-power plumbing where a transition between a straight thread O-ring port and an NPTF female fitting is required. Typical applications include pump ports, valve manifolds, cylinder lines, and other high-pressure hydraulic plumbing. The zinc-plated steel construction provides corrosion resistance for use in shop and field environments. It is suited for both original equipment installation and maintenance replacement work in commercial and industrial settings.

Key Features

• 4000 psi maximum working pressure for high-demand hydraulic circuits
• Male straight thread O-ring end delivers a leak-resistant seal at the port connection
• Female NPTF thread provides a dry-seal tapered pipe thread connection on the mating end
• Zinc-plated steel construction resists corrosion in industrial environments
• Straight fitting shape keeps the fluid path inline with no angular deviation
• 1-3/8 inch hex size accommodates standard open-end and combination wrenches

Compatibility

Designed as an OEM-style replacement or system-build component for industrial hydraulic and fluid-power plumbing that requires a male straight thread O-ring to female NPTF straight adapter at 4000 psi working pressure.

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 fitting. Use a calibrated torque wrench with the 1-3/8 inch hex to avoid overtightening, which can crack ports or distort the O-ring groove. Inspect the O-ring for nicks or damage before assembly and replace it if any defects are present.