Eaton FF4177-04S Square Head Plug 1/4 in Mnpt 6000 Psi

Product Description

The EATON FF4177-04S is a square head pipe plug designed to seal hydraulic and fluid power lines, manifolds, and ported components. The plug uses a 1/4 inch male MNPT thread for a tapered, pressure-tight connection. It is rated to 6,000 psi maximum working pressure and handles a temperature range of -40 degrees F to 250 degrees F. Constructed from steel, it is suited for demanding industrial and hydraulic applications. Plumbers, pipefitters, and hydraulic system technicians install this plug to cap unused ports or close off lines during system modifications or maintenance.

This plug is a standard straight-pattern fitting used in high-pressure hydraulic systems, pneumatic circuits, fluid power assemblies, and industrial piping configurations where a threaded port needs to be blocked or temporarily capped. The 1/4 inch MNPT thread makes it compatible with common port sizes found in hydraulic manifolds, valve bodies, cylinders, and pipe fittings across a wide range of industrial equipment and service applications.

Key Features

• 6,000 psi maximum working pressure rating for high-pressure hydraulic and fluid power service
• 1/4 inch male MNPT tapered thread ensures a leak-resistant seal
• Steel construction for strength and durability in demanding environments
• Operating temperature range of -40 degrees F to 250 degrees F
• Straight fitting shape for direct port sealing without offset

Compatibility

Designed as an OEM-style replacement or service fitting for industrial hydraulic and fluid power systems using 1/4 inch MNPT threaded ports.

Installation Notes

This fitting is installed by qualified pipefitters, hydraulic technicians, or plumbers following applicable IFGC or system-specific pressure codes. Depressurize and isolate the system completely before removing or installing any threaded plug. Apply appropriate thread sealant compatible with the system fluid before installation. Do not overtighten — use a calibrated torque wrench and follow the equipment manufacturer's specifications for 1/4 inch MNPT fittings.