Parker 41IFF-6 Brass Inverted Piloted Flare Nut 3/8 in

Product Description

The PARKER 41IFF-6 is a brass inverted piloted nut designed for flared tube connections in hydraulic, refrigeration, and fluid-system plumbing lines. It accepts 3/8 inch tube OD and threads onto mating fittings at a 5/8-18 UNF thread standard. The inverted piloted design centers the nut on the flare seat during make-up, reducing cross-threading and ensuring a consistent metal-to-metal seal. Brass construction provides corrosion resistance and reliable performance in moderate-pressure fluid systems. This fitting is a standard component used by HVAC technicians, plumbers, and fluid-power mechanics wherever a secure, leak-free flared tube joint is required.

This nut is suited for residential and light commercial applications involving flared copper or aluminum tubing runs. Common installation scenarios include refrigerant line connections, hydraulic control lines, and fuel or oil plumbing assemblies. The 5/8-18 UNF thread matches widely used inverted flare fittings found in HVAC, automotive, and industrial fluid-handling systems. It is sold individually and is intended as a replacement or new-installation component wherever an inverted piloted flare nut of this tube size is specified.

Key Features

• Inverted piloted design centers nut on flare seat for consistent, leak-resistant make-up
• Brass construction resists corrosion in refrigerant, fuel, and hydraulic fluid service
• 3/8 inch tube OD accommodates standard flared copper and aluminum tubing
• 5/8-18 UNF thread engages common inverted flare body fittings
• Flare-end connection provides a metal-to-metal seal without sealant tape or compound

Compatibility

Designed as an OEM-style replacement or new-installation component for inverted flare tube assemblies requiring a 3/8 inch tube OD piloted nut with 5/8-18 UNF thread engagement.

Installation Notes

Installation is typically performed by licensed HVAC technicians, plumbers, or fluid-power mechanics. De-pressurize and isolate the system and purge any residual fluid before disassembling flare connections. Hand-tighten the nut onto the fitting body before applying a wrench to avoid cross-threading. Follow applicable system codes and the fitting manufacturer's torque guidelines for flare connections to avoid deforming the flare seat.