Proto J3820 Ratcheting Flare Nut Wrench 5/8 Inch

Product Description

The PROTO J3820 is a single-end ratcheting flare nut wrench designed for use on flare fittings found in HVAC refrigerant lines, fuel lines, and hydraulic connections. The 12-point box end grips flare nuts securely and the ratcheting action allows fastener rotation without removing and repositioning the wrench, reducing effort in tight service spaces. The wrench measures 7.25 inches overall length and fits a 5/8 inch flare nut. It is constructed from steel and finished in black. HVAC technicians and plumbers reach for this tool when breaking loose or torquing flare connections on copper tubing and soft-line fittings.

This wrench is suited for residential and light commercial HVAC service, refrigeration work, and plumbing applications where flare fittings are used. The 5/8 inch size is a common dimension on refrigerant line sets and fuel line fittings. The ratcheting mechanism makes it particularly useful in confined equipment cabinets and mechanical rooms where swing arc is limited. It is a hand-tool item intended for use by licensed HVAC technicians, refrigeration mechanics, and plumbers.

Key Features

• Ratcheting box end allows fastener rotation without repositioning the wrench
• 12-point design provides multiple contact angles for use in restricted spaces
• Single-end head configuration with 5/8 inch flare nut fitment
• Steel construction for durability in field service conditions
• Black finish for corrosion resistance and reduced glare
• 7.25 inch overall length balances reach and control in tight installations

Compatibility

Designed for use on 5/8 inch flare nuts commonly found on HVAC refrigerant line sets, fuel lines, and hydraulic fittings in residential and light commercial systems.

Installation Notes

This wrench is used by HVAC technicians, refrigeration mechanics, and plumbers during installation or service of flare-fitting connections. Always recover or isolate refrigerant before breaking a refrigerant line connection in compliance with EPA Section 608 requirements. Confirm the flare nut size matches the wrench before applying torque to avoid rounding the fitting. Keep the wrench clean and inspect the ratchet mechanism regularly for proper engagement.