Proto J4916HFL Flare Nut Crowfoot Wrench 1/2 Inch

Product Description

The PROTO J4916HFL is a 1/2-inch flare nut crowfoot wrench designed for use with a standard 3/8-inch or 1/2-inch drive torque wrench or ratchet. The enclosed 6-point head grips hex flare nuts and line fittings on all sides, reducing the risk of rounding soft nuts during tightening or loosening. The head measures 1-3/32 inches in diameter and 1/4 inch thick, allowing access in confined spaces where a standard open-end wrench cannot reach. Overall length is 1.63 inches. The chrome-plated finish resists corrosion and simplifies cleaning in field conditions. This tool is built to ASME B107.21 and Federal Specification GGG-C-1507b. Plumbers, HVAC technicians, and refrigeration mechanics reach for this wrench when working on flare fittings, brake lines, and fuel lines in tight quarters.

The J4916HFL is suited for residential and light commercial service work where flare nut connections appear on refrigerant lines, gas supply tubing, hydraulic fittings, and plumbing supply lines. The crowfoot design allows the wrench to be used at angles that a box-end wrench cannot achieve, making it especially useful in engine bays, mechanical rooms, and behind HVAC equipment where straight access is limited. A torque wrench drive connection lets the technician apply accurate torque to flare fittings without slipping.

Key Features

• 1/2-inch wrench size fits standard flare nuts and line fittings
• 6-point enclosed head reduces fastener rounding under load
• Head diameter of 1-3/32 inches and 1/4-inch head thickness for tight-space access
• Chrome-plated finish for corrosion resistance and easy cleaning
• Meets ASME B107.21 and Federal Specification GGG-C-1507b
• Limited Lifetime Warranty

Compatibility

Designed as a standard crowfoot wrench for use with 3/8-inch or 1/2-inch square drive torque wrenches and ratchets. Fits 1/2-inch flare nut and line fitting hex sizes in inch measurement systems.

Installation Notes

A licensed HVAC technician, plumber, or mechanic should always isolate and depressurize the line or system before loosening or tightening flare fittings. Attach the crowfoot to a calibrated torque wrench when fitting torque values are required by code or manufacturer specification. Align the drive square fully before applying force to avoid drive slippage. Follow applicable codes such as IFGC for gas line fittings or applicable refrigerant piping standards when working on pressurized systems.