Parker 66AB-6-4 Compression Tube Connector 1/4-18 Nptf

Product Description

The PARKER 66AB-6-4 is a brass compression tube connector designed to join a compression tube end to a female NPT pipe thread. It is rated for up to 400 psi working pressure and handles temperatures from -65 degrees F to 250 degrees F, making it suitable for a broad range of fluid and pneumatic line applications. The fitting meets D.O.T. FMVSS571.106 and SAE J246 standards, confirming its use in regulated transport and hydraulic system environments. Plumbers, HVAC technicians, and fluid-systems mechanics install this type of fitting when connecting tubing to threaded port fittings in tight-tolerance assemblies.

This connector is used in residential, commercial, and mobile equipment installations where a compression tube must terminate at a female NPT port. Typical applications include brake and fuel line assemblies, pneumatic control circuits, refrigeration and HVAC tubing connections, and hydraulic fluid circuits requiring a leak-free mechanical seal. The 1/4-18 NPTF thread size and 0.314-inch inside diameter suit standard quarter-inch tubing runs commonly found in these systems.

Key Features

• Brass construction provides corrosion resistance in fluid and pneumatic service
• Compression x FNPT end connections allow tubing to thread-port transitions without soldering
• 400 psi maximum working pressure rated for demanding pneumatic and hydraulic lines
• Wide temperature range of -65 degrees F to 250 degrees F covers most trade applications
• Meets D.O.T. FMVSS571.106 and SAE J246 standards for regulated installations
• 1/4-18 NPTF thread standard ensures pressure-tight makeup without sealant tape in many applications

Compatibility

Designed as an OEM-style compression-to-female-NPT connector for quarter-inch tubing systems requiring a 1/4-18 NPTF threaded port connection in pneumatic, hydraulic, fuel, or refrigeration line assemblies.

Installation Notes

Installation is performed by licensed plumbers, HVAC technicians, or qualified fluid-systems mechanics. Depressurize and isolate the line completely before removing any existing fitting or installing this connector. Hand-tighten the compression nut onto the tubing, then advance with a wrench per standard compression fitting practice — do not overtighten, as brass ferrules can deform and leak. Verify thread engagement and test at working pressure before returning the system to service.