Parker 1/4 Ff-s Hex Plug 1/4 Inch Mnptf 6000 Psi

Product Description

The PARKER 1/4 FF-S is a straight hex plug designed to seal female pipe threads in high-pressure hydraulic and pneumatic systems. It features a 1/4 inch male MNPTF (Dryseal) thread connection and is rated for a maximum working pressure of 6000 psi. The straight configuration and hex drive allow for fast, tool-assisted installation in tight plumbing assemblies. This type of fitting is installed by licensed plumbers, hydraulic system technicians, and industrial maintenance professionals working on fluid power lines, manifold blocks, and pressure-rated piping systems.

This hex plug is suited for use in industrial pipe systems where a pressure-rated, leak-free seal is required at an open port or unused branch connection. Its MNPTF thread form provides a dryseal fit, reducing the need for additional sealant on properly mated fittings. Typical applications include hydraulic power units, pneumatic distribution systems, and high-pressure fluid lines in commercial and industrial facilities.

Key Features

• Maximum working pressure of 6000 psi for demanding hydraulic and pneumatic applications
• 1/4 inch MNPTF (Dryseal) male thread for a pressure-tight seal
• Straight hex plug configuration for direct port sealing
• 5/8 inch hex size for standard wrench or socket installation
• Overall length of 1-7/16 inches for compact fitment in tight assemblies

Compatibility

Designed as an OEM-style replacement or service fitting for industrial pipe systems using 1/4 inch MNPTF female threaded ports rated to 6000 psi.

Installation Notes

Installation should be performed by a qualified plumber or hydraulic technician familiar with dryseal thread standards. De-pressurize and isolate the system completely before removing or installing any pipe plugs. Use an appropriately sized wrench on the hex to avoid rounding; do not over-torque, as MNPTF dryseal threads are designed to seal on thread interference without excessive force. Follow applicable IPC or IFGC guidelines for the specific fluid or gas service involved.