Proto J4918HFL Flare Nut Crowfoot Wrench 9/16 Inch

Product Description

The PROTO J4918HFL is a 9/16 inch flare nut crowfoot wrench designed for use with a 3/8 inch drive ratchet or torque wrench. Built for professional trades, this crowfoot style wrench grips hex fittings from the side, allowing access to tubing connections and flare nuts in tight spaces where a standard box wrench cannot reach. The 6-point contact pattern reduces fastener rounding under load. The chrome-plated finish resists corrosion and makes wiping down in service environments straightforward. At 0.11 pounds, it is a lightweight addition to any refrigeration, plumbing, or mechanical tool kit.

This wrench is well suited for HVAC technicians working flare fittings on refrigerant lines, plumbers tightening supply line nuts behind fixtures, and mechanics accessing confined fastener locations. The open-side entry allows the wrench to slide over tubing and seat on the hex flat of the fitting without disconnecting the line. It is a standard tool choice wherever tubing connections prevent a closed-end wrench from fitting squarely onto a nut.

Key Features

• 9/16 inch wrench size for standard flare nut and hex fitting applications
• 6-point contact reduces slippage and protects fastener flats
• Chrome-plated finish for corrosion resistance and easy cleaning
• 1.63 inch overall length fits compact into a drive set
• Head diameter of 1.25 inches with 0.25 inch head thickness for low-profile access
• Meets ASME B107.21 and Federal Specification GGG-C-1507b standards

Compatibility

Designed for use with 3/8 inch drive ratchets, extensions, and torque wrenches as a standard crowfoot accessory for 9/16 inch flare nuts and hex fittings.

Installation Notes

This tool is installed by HVAC technicians, plumbers, and mechanical tradespeople. Before working on refrigerant lines or pressurized supply lines, relieve system pressure and follow all applicable safety procedures. Seat the crowfoot fully on the fitting hex before applying torque to avoid rounding the nut. When used on a torque wrench at an angle offset from inline, apply the appropriate correction factor per the torque wrench manufacturer guidance.