Parker 41FX-6 Brass Flared Tube Nut 3/8 in 5/8-18 Unf

Product Description

The PARKER 41FX-6 is a brass flared tube nut designed for use in flared tube fitting assemblies. It mates with 45-degree flare fittings on 3/8-inch OD tubing and accepts a 5/8-18 UNF thread. Rated to 1000 psi maximum working pressure and 250 degrees F maximum working temperature, this nut is suitable for hydraulic, refrigeration, and pneumatic line connections where a secure, leak-resistant flare joint is required. At 0.91 inches overall length, it is a short-body design that fits in tight installations. Licensed HVAC technicians, plumbers, and refrigeration mechanics are the primary installers of this type of fitting hardware.

This flared tube nut is used in residential and light commercial applications wherever 3/8-inch OD tubing is joined with 45-degree SAE flare connections. Typical install scenarios include refrigerant line sets, fuel gas lines, hydraulic control lines, and plumbing supply runs that require a removable, pressure-rated mechanical joint. The short nut profile suits installations with limited wrench clearance.

Key Features

• 45-degree flare end connection for reliable SAE-style tube joints
• 5/8-18 UNF thread for precise, secure engagement
• Brass construction resists corrosion in refrigerant, fuel, and water service
• Rated to 1000 psi maximum working pressure
• Rated to 250 degrees F maximum working temperature
• Meets SAE J512, SAE J513, and UL Listing standards

Compatibility

Designed as an OEM-style replacement or service fitting for 45-degree SAE flare assemblies using 3/8-inch OD tubing with a 5/8-18 UNF threaded connection.

Installation Notes

Installation is performed by licensed HVAC technicians, refrigeration mechanics, or plumbers. De-pressurize and evacuate the line before disassembly or assembly of any flare fitting. Use an appropriately sized flare nut wrench to avoid rounding the nut; do not over-tighten, as brass flare nuts are susceptible to thread damage. Verify the tubing flare is properly formed to the 45-degree angle before final tightening to ensure a leak-free joint.