Parker 1/4 X 1/8 Ff-s Hex Plug 6000 Psi Mnptf

Product Description

The PARKER 1/4 X 1/8 FF-S is a straight hex plug fitting designed to seal or terminate threaded pipe connections in high-pressure industrial systems. It uses a male MNPTF (Dryseal Male National Pipe Thread Fuel) connection type, which creates a pressure-tight seal without relying solely on thread sealant. Rated to 6,000 psi maximum working pressure, this plug is built for demanding fluid power and instrumentation applications. The fitting measures 1.25 inches in overall length with a 0.625 inch hex size, allowing installation with a standard wrench. Weighing 0.1 pounds, it ships as a single-piece unit. HVAC, plumbing, and industrial piping technicians commonly install this fitting when capping unused ports on manifolds, valves, or pneumatic and hydraulic components.

This hex plug is appropriate for use in hydraulic lines, pneumatic systems, fuel delivery circuits, and instrumentation plumbing where a leak-free threaded termination is required. The straight configuration makes it a direct port plug rather than a directional fitting, suiting it to inline port-sealing tasks in both residential mechanical rooms and commercial or industrial equipment. The MNPTF thread standard is widely used in fluid power components across HVAC, refrigeration, and general industrial piping installations.

Key Features

• 6,000 psi maximum working pressure rating for high-pressure applications
• MNPTF (Dryseal) thread form provides a pressure-tight seal at the thread interface
• Straight hex plug shape for direct port termination without redirection
• 5/8 inch hex size compatible with standard open-end and box wrenches
• Compact 1.25 inch overall length suits tight installation spaces
• Sold as a single unit with a minimum order quantity of one

Compatibility

Designed as an OEM-style replacement or service fitting for industrial pipe systems using 1/4 inch by 1/8 inch male MNPTF threaded ports, including hydraulic manifolds, pneumatic valves, and fluid power components rated to 6,000 psi.

Installation Notes

This fitting is installed by licensed pipefitters, plumbers, or fluid power technicians working on pressurized systems. Always depressurize and bleed down the system completely before removing or installing any threaded fittings. MNPTF threads are designed to seal on the thread form itself; apply thread sealant only if required by the system manufacturer or applicable code, as overtaping or over-sealing can affect torque and engagement. Verify thread compatibility before installation to avoid cross-threading or damage to the mating port.