Proto J5378CF Open End Crowfoot Wrench 2-7/16 Inch

Product Description

The PROTO J5378CF is an open end crowfoot wrench designed for use with 1/2-inch drive torque wrenches and ratchets. It accepts a 2-7/16-inch fastener and features a chrome-plated finish for corrosion resistance. The open end crowfoot design provides access to hex fasteners in tight or recessed locations where a standard box or combination wrench cannot reach. At 1.25 pounds, this is a solid, full-size tool suited for heavy-duty mechanical work. Plumbers, pipefitters, HVAC technicians, and industrial mechanics reach for crowfoot wrenches when working around pipe fittings, hydraulic lines, and large-body fasteners that require controlled torque application.

This crowfoot wrench is well-suited for residential and commercial mechanical applications where access to large hex fasteners is restricted. Typical use cases include tightening flare fittings, hydraulic connectors, and large plumbing nuts found in mechanical rooms, boiler installations, and refrigeration equipment. The 2-7/16-inch opening makes it a practical choice for large-body fasteners common in industrial and commercial HVAC and plumbing systems. The 4-3/8-inch head diameter and 1/2-inch head thickness are sized for compatibility with standard 1/2-inch drive torque tools.

Key Features

• 2-7/16-inch open end fits large hex fasteners and fittings in restricted-access locations
• Chrome-plated finish provides corrosion resistance for extended service life
• 1/2-inch head thickness allows use in shallow or tight clearance applications
• 4-3/8-inch head diameter sized for use with 1/2-inch drive torque wrenches and extensions
• Lifetime warranty backed by the PROTO professional tool line

Compatibility

Designed for use with standard 1/2-inch drive torque wrenches, ratchets, and extension bars. Suitable for use in HVAC, plumbing, pipefitting, and industrial mechanical applications requiring a 2-7/16-inch open end crowfoot fitting.

Installation Notes

Install this crowfoot wrench onto a 1/2-inch drive torque wrench or ratchet before positioning it on the fastener, as the drive connection cannot be made once the head is seated. When using with a torque wrench, account for any offset between the drive centerline and the fastener centerline if accurate torque values are required. Ensure the fastener and crowfoot seating surfaces are clean and free of debris before applying load. This tool is intended for hand-drive use only and should not be struck with a hammer or used with impact drivers.