Parker 259IFHD-5-4 Brass Inverted 45 Flare Elbow 5/16 in

Product Description

The PARKER 259IFHD-5-4 is a brass inverted 45-degree flare elbow fitting designed for use in hydraulic, refrigeration, and fluid-transfer line assemblies. It connects a 5/16-inch OD flared tube to a 1/4-18 NPTF male pipe thread, changing line direction by 45 degrees without the need for additional adapters. Rated to 1200 psi maximum working pressure and 250 degrees F maximum working temperature, this fitting is built for demanding service environments. The brass construction offers corrosion resistance and reliable sealing performance at both the flare and threaded connections. Typical installers include HVAC technicians, refrigeration mechanics, and hydraulic system technicians.

This fitting is suited for residential and light commercial HVAC systems, automotive air conditioning, refrigeration equipment, and hydraulic fluid lines where an inverted 45-degree flare connection to a male NPTF port is required. The 5/16-inch tube OD and 1/4-18 thread size are common in refrigerant line sets and low-to-medium-pressure hydraulic circuits. It is packaged and sold individually, making it appropriate for single-point repair or new installation work.

Key Features

• Inverted 45-degree flare elbow geometry for compact directional changes in tight line routing
• Brass construction provides corrosion resistance and compatibility with refrigerants and hydraulic fluids
• Rated to 1200 psi maximum working pressure for reliable performance in pressurized systems
• Maximum working temperature of 250 degrees F for high-temperature service environments
• Flare x MNPTF end connections for secure leak-resistant joints at both the tube and pipe ends
• Meets SAE J51 standards and is UL Listed

Compatibility

Designed as an OEM-style replacement or new-installation fitting for systems using 5/16-inch OD inverted flare tube connections with 1/4-18 NPTF male pipe thread ports, consistent with SAE J51 inverted flare standards.

Installation Notes

Installation should be performed by a licensed HVAC technician, refrigeration mechanic, or hydraulic system technician. Always depressurize and isolate the system before removing or installing fittings. Ensure the tube end is properly flared to the inverted 45-degree specification before assembly, and inspect threads for damage prior to installation. Follow applicable SAE and system-manufacturer torque and assembly guidelines; do not overtighten, as brass fittings can be damaged by excessive force.