Proto J4924HFL Flare Nut Crowfoot Wrench 3/4 Inch

Product Description

The PROTO J4924HFL is a 3/4-inch flare nut crowfoot wrench designed for use with a 3/8-inch or compatible drive ratchet or torque wrench. It features a 6-point opening that grips flat sides of flare nuts and line fittings, reducing the risk of rounding. The head diameter measures 1-19/32 inches with a head thickness of 1/4 inch, keeping it compact enough to fit in tight spaces around refrigerant lines, fuel lines, and hydraulic fittings. The chrome-plated finish resists corrosion and makes the tool easier to wipe clean. It meets ASME B107.21 and Federal Specification GGG-C-1507b and is backed by a limited lifetime warranty.

This crowfoot wrench is suited for HVAC technicians, plumbers, and mechanics working on flare fittings in confined areas where a standard box-end wrench cannot be positioned. Common applications include tightening or loosening 3/4-inch flare nuts on refrigerant line sets, fuel supply lines, and hydraulic or pneumatic tubing connections. The crowfoot design allows torque wrench use, making it appropriate for installations where specified torque values must be met.

Key Features

• 3/4-inch size with 6-point profile for secure grip on flare nuts and line fittings
• Head diameter of 1-19/32 inches and head thickness of 1/4 inch for access in tight spaces
• Chrome-plated finish for corrosion resistance and easy cleaning
• Meets ASME B107.21 and Federal Spec GGG-C-1507b
• Compatible with standard drive ratchets and torque wrenches for controlled fastening
• Backed by a limited lifetime warranty

Compatibility

Designed for use with 3/4-inch flare nuts and line fittings; fits standard drive ratchets and torque wrenches in inch-measurement tooling setups.

Installation Notes

This tool is installed onto a compatible drive ratchet or torque wrench before use. Always ensure the refrigerant system, fuel supply, or hydraulic circuit is properly isolated and depressurized before loosening or tightening flare fittings. Verify the correct wrench size against the fitting before applying torque to avoid rounding the nut. HVAC work involving refrigerant lines should be performed by EPA Section 608 certified technicians.