Parker 41FL-12 Brass Flared Tube Long Nut 3/4 in Od

Product Description

The PARKER 41FL-12 is a brass flared tube long nut designed for use in fluid and refrigerant line connections that require a secure 45-degree flare fitting. The nut accepts 3/4-inch tube OD and threads onto mating fittings with a 1-1/16-14 UNF thread. Brass construction provides corrosion resistance and good machinability, making it a reliable choice for HVAC, refrigeration, and plumbing applications where flare connections are specified. Licensed HVAC technicians and plumbers reach for this style of nut when making or remaking flare joints on copper or compatible tubing.

This long nut is suited for residential and commercial installations where 45-degree flare end connections are required. Typical applications include refrigerant line sets, fuel gas copper tubing assemblies, and hydraulic or fluid transfer lines that use standard flare fittings. The extended nut body provides additional thread engagement, which helps maintain a leak-free joint under vibration or thermal cycling common in HVAC and refrigeration systems.

Key Features

• Brass material offers corrosion resistance and compatibility with common refrigerant and fluid media
• 45-degree flare angle matches the SAE standard used across HVAC, refrigeration, and fuel line fittings
• 3/4-inch tube OD sizing fits standard copper and compatible tubing used in residential and commercial systems
• 1-1/16-14 UNF thread standard ensures precise, repeatable engagement with mating fitting bodies
• Long nut body provides extended thread engagement for improved joint integrity

Compatibility

Designed as an OEM-style replacement or service fitting for systems using 45-degree SAE flare connections with 3/4-inch tube OD and 1-1/16-14 UNF threaded mating fittings.

Installation Notes

Installation is typically performed by licensed HVAC technicians or plumbers following applicable codes. Shut off and recover all refrigerant or depressurize the fluid line before disconnecting or replacing any flare fitting. Use a properly sized flaring tool to ensure the tube end is clean and correctly formed to the 45-degree angle before tightening the nut. Do not overtighten brass fittings, as excessive torque can crack the flare or distort the nut threads.