Proto J4913MCF Open End Crowfoot Wrench 1-3/32 in

Product Description

The PROTO J4913MCF is an open end crowfoot wrench designed for fastener access in confined spaces where standard wrenches cannot reach. The crowfoot head measures 1-3/32 inches in diameter and 1/4 inch thick, allowing it to seat on nuts and fittings in tight quarters. It accepts a standard 1/4-inch square drive ratchet or torque wrench, giving the technician controlled torque delivery without direct socket clearance. The chrome-plated finish resists corrosion and surface wear under regular shop and field use. Manufactured to ASME B107.21 and Federal Specification GGG-C-1507b, it meets recognized dimensional and performance standards for professional hand tools.

This crowfoot wrench is suited for HVAC, plumbing, automotive, and general mechanical work where tube fittings, hydraulic lines, or recessed fasteners prevent use of a box or open end wrench. Technicians reach it into engine bays, equipment panels, and mechanical chases to turn fasteners that are obstructed by adjacent components. The 1-1/2-inch overall length keeps the head compact for close-clearance applications. It is commonly used alongside a torque wrench when a specified torque value must be applied to a hard-to-reach fastener.

Key Features

• 1-3/32-inch head diameter fits correspondingly sized nuts and fittings
• 1/4-inch head thickness allows seating in shallow or tight clearances
• 1-1/2-inch overall length for compact reach in confined spaces
• Chrome-plated finish for corrosion resistance and easy cleaning
• Meets ASME B107.21 and Federal Spec GGG-C-1507b dimensional standards
• Accepts standard 1/4-inch square drive ratchets and torque wrenches

Compatibility

Designed as an OEM-style open end crowfoot wrench for use with any 1/4-inch square drive ratchet, extension, or torque wrench in professional trade and mechanical service applications.

Installation Notes

Crowfoot wrenches are installed by mechanics, HVAC technicians, and plumbers working on restricted fasteners. Before use, ensure the drive ratchet or torque wrench is rated for the application and that the crowfoot head is fully seated on the fastener to prevent rounding. When using with a torque wrench and the head is offset from the drive centerline, apply a torque correction calculation per standard mechanical practice. Do not extend the drive handle with a cheater bar, as this can exceed the tool rating and cause fastener or tool damage.