Parker 41FL-5 Brass Flared Tube Long Nut 5/16 in 45 Deg

Product Description

The PARKER 41FL-5 is a brass long nut designed for 45-degree flared tube connections in fluid and refrigerant line assemblies. It mates with a 5/16-inch OD flared tube and uses a 1/2-20 UNF thread to secure the flare fitting union. At 1.12 inches overall length, this long-nut profile provides added thread engagement compared to standard short nuts, which is important in applications with vibration or repeated service cycles. Rated to 1,200 psi maximum working pressure and 250 degrees F, it suits a range of hydraulic, pneumatic, refrigeration, and fuel line applications. Licensed HVAC and refrigeration technicians, plumbers, and pipefitters are the primary installers.

This fitting is used in residential and light commercial HVAC systems, refrigeration equipment, hydraulic lines, and fuel delivery assemblies wherever a 45-degree SAE flare connection is specified. It conforms to SAE J512 and SAE J513 standards and carries a UL Listing, making it suitable for installations governed by those codes. Typical use involves securing a flared copper or aluminum tube to a flare fitting body or valve port in a pressurized fluid circuit.

Key Features

• 45-degree flare angle per SAE J512 and SAE J513 standards
• 1/2-20 UNF thread for positive, leak-resistant engagement
• Rated to 1,200 psi maximum working pressure
• Rated to 250 degrees F maximum working temperature
• Brass construction resists corrosion in refrigerant, fuel, and hydraulic service
• UL Listed for use in regulated installations

Compatibility

Designed as an OEM-style replacement or service fitting for 45-degree SAE flare assemblies using 5/16-inch OD tubing with a 1/2-20 UNF thread connection.

Installation Notes

Installation should be performed by a licensed HVAC technician, refrigeration mechanic, or qualified pipefitter familiar with SAE flare fittings. De-pressurize and isolate the line before disassembly; recover refrigerant where applicable per EPA Section 608 requirements. Hand-tighten the nut onto the flare fitting first to confirm thread alignment, then torque with a flare nut wrench to avoid deforming the flare seat. Do not overtighten brass fittings, as the material can crack under excessive force.