Parker 4-6 Flo-s Compression Tube Connector Orfs X Nptf

Product Description

The PARKER 4-6 FLO-S is a compression tube connector designed to join a 1/4-inch outside-diameter tube to a 3/8-18 NPTF female port using an O-Ring Face Seal (ORFS) end on the tube side. Rated to 6000 psi maximum working pressure, this fitting is built for high-pressure hydraulic and fluid-power lines where leak-free performance is critical. The zinc-plated steel construction provides corrosion resistance suitable for industrial and mobile hydraulic environments. It is installed by hydraulic technicians, plumbers, and fluid-systems mechanics working on pressurized lines requiring a reliable metal-to-metal seal combined with ORFS sealing geometry.

This connector is suited for hydraulic power units, mobile equipment, industrial machinery, and high-pressure fluid-transfer systems where a transition from a compression tube line to an NPTF threaded port is required. The ORFS end provides a positive face-seal connection that reduces the risk of leaks under vibration and pressure cycling. Applications include both stationary and mobile hydraulic circuits operating in demanding service environments.

Key Features

• 6000 psi maximum working pressure for high-pressure hydraulic service
• ORFS x NPTF end connections allow transition from compression tube to tapered pipe thread ports
• 3/8-18 NPTF thread size provides a pressure-tight mechanical seal without sealant tape on the pipe end
• 1/4-inch tube outside diameter compatibility for standard small-bore hydraulic tubing
• Zinc-plated steel construction for corrosion resistance in industrial environments

Compatibility

Designed as an OEM-style compression tube connector for high-pressure hydraulic and fluid-power systems requiring a 1/4-inch OD tube ORFS connection to a 3/8-18 NPTF port.

Installation Notes

Installation should be performed by a qualified hydraulic technician or pipefitter. Depressurize and isolate the hydraulic circuit completely before removing or installing any fittings. Inspect the ORFS face and tube end for nicks or burrs before assembly, as surface damage will compromise the seal. Torque the ORFS nut to the fitting manufacturer's published specification and verify the NPTF threads engage fully to achieve a pressure-tight connection.