Proto J4911MCF Open End Crowfoot Wrench Metric

Product Description

The PROTO J4911MCF is an open end crowfoot wrench designed for use with standard 1/4-inch drive torque tools and ratchet extensions. It features a chrome-plated finish for corrosion resistance and a compact head profile that fits into confined spaces where a standard open end wrench cannot reach. The head diameter measures 0.87 inches with a head thickness of 0.25 inches and an overall length of 1.13 inches. Built to ASME B107.21 standards, this wrench is suited for professional trade applications where access is limited and accurate torque application is required.

This crowfoot wrench is used in automotive, mechanical, and industrial service environments where fasteners are recessed or surrounded by adjacent components. Its metric sizing makes it appropriate for equipment with metric fasteners. Typical install scenarios include engine service, HVAC equipment assembly, and machinery maintenance where a standard wrench or socket cannot engage the fastener directly. It is installed by mechanics, HVAC technicians, and industrial maintenance professionals.

Key Features

• Open end crowfoot design fits 1/4-inch drive torque wrenches and extension bars
• Chrome-plated finish resists corrosion and simplifies cleaning
• Compact 0.25-inch head thickness for access in tight spaces
• Meets ASME B107.21 and Federal Specification GGG-C-1507b standards
• Metric system of measurement
• Backed by a Limited Lifetime Warranty

Compatibility

Designed for use with 1/4-inch drive torque wrenches, ratchets, and extension bars. Metric sizing is suitable for fasteners on equipment manufactured to metric specifications.

Installation Notes

This crowfoot wrench is installed by mechanics, HVAC technicians, and industrial maintenance professionals using standard 1/4-inch drive torque tools. Ensure the drive tool and crowfoot are fully seated before applying torque to prevent slippage or fastener damage. When using a crowfoot at an angle offset from the drive axis, consult the torque wrench manufacturer guidelines for any correction factor that may apply. Follow all applicable safety practices for the system being serviced before beginning work.