Parker 66C-4-2 Compression Tube Connector Brass Sae J-512

Product Description

The PARKER 66C-4-2 is a brass compression tube connector designed to join a compression tube end to a female NPT port in fluid and pneumatic line assemblies. It features a 1/8-27 NPTF thread on the female pipe end and a compression fitting on the tube end, creating a reliable, leak-resistant mechanical connection without soldering or flaring. Rated to 300 psi maximum working pressure and a temperature range of -65 degrees F to 250 degrees F, this connector suits demanding service conditions. It is manufactured to SAE J-512 standards and constructed from brass for corrosion resistance in a wide range of media.

This connector is used in refrigeration, HVAC, hydraulic, and pneumatic tubing systems where a compression-to-female-pipe transition is required. Typical applications include instrument lines, control lines, and small-bore fluid circuits in both residential and light commercial equipment. It is sized for 1/8-27 female NPT ports and is well suited for copper or compatible soft-metal tubing installations. Licensed tradespeople including HVAC technicians, plumbers, and pipefitters commonly specify this fitting when transitioning between tubing and threaded pipe connections.

Key Features

• Brass construction for corrosion resistance and compatibility with a wide range of fluids
• Compression x FNPT end connections for tool-based, no-flare tube joining
• 1/8-27 NPTF thread standard for reliable pressure-tight pipe engagement
• 300 psi maximum working pressure for demanding fluid and pneumatic service
• Operating temperature range of -65 degrees F to 250 degrees F
• Manufactured to SAE J-512 for consistent dimensional and performance standards

Compatibility

Designed as an OEM-style compression tube connector for fluid, pneumatic, and refrigeration line assemblies requiring a 1/8-27 NPTF female pipe thread port transition to a compression tube end.

Installation Notes

Installation should be performed by a licensed HVAC technician, plumber, or pipefitter. De-energize the system and relieve all line pressure before disassembling or installing fittings. Compression fittings require proper tube preparation including a clean, square cut and a fully seated ferrule before tightening the compression nut. Follow applicable IPC and IFGC guidelines for the system type, and verify thread sealant compatibility with the media being conveyed before applying any thread compound to the NPTF connection.