Holyoke Fittings 41FP-65 Forged Flare Nut 3/8x5/16

Product Description

The HOLYOKE FITTINGS 41FP-65 is a forged flare nut designed for use in refrigeration and HVAC line set connections. This fitting features a short flare profile and is sized at 3/8 inch by 5/16 inch, making it suitable for connecting copper tubing at flare joints. Forged construction provides greater material integrity and resistance to deformation under torque compared to cast alternatives. HVAC technicians and refrigeration mechanics use this type of nut when assembling or servicing flare fittings on refrigerant lines, ensuring a leak-free mechanical seal at the joint interface.

This flare nut is used in residential and light commercial HVAC and refrigeration systems where copper line sets terminate at flare-type service valves, manifolds, or equipment connections. The 3/8 inch by 5/16 inch sizing covers common small-diameter line set applications. It is installed by HVAC technicians and refrigeration mechanics during new installations and service calls requiring flare joint repair or replacement.

Key Features

• Forged construction for improved strength and torque resistance over cast fittings
• Short flare profile suits compact connection points on line sets and equipment ports
• Sized at 3/8 inch by 5/16 inch for small-diameter copper tubing applications
• Designed for use at flare-type joints in refrigerant line systems

Compatibility

Designed as an OEM-style replacement flare nut for use in residential and light commercial refrigeration and HVAC systems utilizing standard flare-type fittings on copper line sets.

Installation Notes

Installation should be performed by a licensed HVAC technician or refrigeration mechanic. Recover and evacuate refrigerant from the system before disassembling any flare connections, in compliance with EPA Section 608 requirements. Use a properly sized flare nut wrench to avoid rounding the fitting. Inspect the mating flare seat for damage before torquing the new nut into place.

Technical Specifications

• Size: 3/8 inch x 5/16 inch
• Construction: Forged
• Fitting Type: Flare Nut
• Profile: Short Flare

Standard Information

• Brand: HOLYOKE FITTINGS
• Manufacturer Part Number: 41FP-65