Holyoke Fittings 41 Fpl-6 Long Forged Flare Nut 3/8 in

Product Description

The HOLYOKE FITTINGS 41 fpl-6 is a long forged flare nut sized for 3/8-inch OD tubing, used to create secure, leak-resistant flare connections in refrigeration, HVAC, and plumbing systems. Forged construction delivers greater strength and pressure resistance than cast alternatives, making this nut a reliable choice for field connections that must hold up under vibration and thermal cycling. HVAC technicians and plumbers reach for this fitting when terminating or extending flare-type lines in both new construction and service work.

This flare nut is suited for residential and light commercial applications where 3/8-inch OD copper or compatible tubing is used. Common installation scenarios include refrigerant line sets, fuel gas connections, and water supply lines that require a flared mechanical joint. The long-body design provides additional thread engagement, which helps maintain a stable connection at joint points that may experience movement or vibration over time.

Key Features

• Forged construction for superior strength and pressure resistance compared to cast fittings
• Long-body design provides increased thread engagement for a more stable flare joint
• Sized for 3/8-inch OD tubing, a common dimension in HVAC and refrigeration line sets
• Compatible with standard SAE 45-degree flare connections typical in trade applications

Compatibility

Designed as an OEM-style replacement or new-installation fitting for systems using 3/8-inch OD flare-type connections in HVAC, refrigeration, and plumbing applications.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber following applicable local codes and manufacturer guidelines. Always de-pressurize and isolate the line before removing or installing any flare fitting. Use a calibrated flaring tool to prepare the tubing end before seating the nut, and tighten to fitting specifications using a properly sized flare wrench to avoid over-torquing the soft tubing. Inspect the flare seat for deformation or debris before final assembly.

Technical Specifications

• Tubing OD: 3/8 inches
• Body Style: Long
• Construction: Forged
• Connection Type: Flare Nut

Standard Information

• Brand: HOLYOKE FITTINGS
• Manufacturer Part Number: 41 fpl-6