Proto J4921MCF Open End Crowfoot Wrench 1-23/32 in

Product Description

The PROTO J4921MCF is an open end crowfoot wrench designed for accessing fasteners in confined spaces where a standard open-end wrench cannot reach. It drives with a 3/8-inch or 1/2-inch square drive ratchet or torque wrench via its crowfoot profile. The head diameter measures 1-23/32 inches with a head thickness of 1/4 inches, making it well suited for flat or low-clearance work surfaces. The chrome-plated finish resists corrosion and simplifies cleanup. Overall length is 2-3/32 inches. This tool is installed by mechanics, millwrights, HVAC technicians, and plumbers working in tight quarters.

Crowfoot wrenches like the J4921MCF are used wherever a standard box or open-end wrench cannot swing a full arc. Common applications include torquing fittings on HVAC refrigerant lines, hydraulic connections, and plumbing supply lines in confined spaces. The metric-specification head suits metric fasteners and fittings. It pairs with any standard square-drive extension, ratchet, or torque wrench to deliver controlled torque in restricted areas.

Key Features

• 1-23/32 inch head diameter for metric fastener and fitting access
• 1/4 inch head thickness enables use in low-clearance installations
• 2-3/32 inch overall length for compact reach in tight spaces
• Chrome-plated finish for corrosion resistance and easy cleaning
• Meets ASME B107.21 and Federal Specification GGG-C-1507b standards
• Covered by a Limited Lifetime Warranty

Compatibility

Designed as an OEM-style crowfoot wrench compatible with standard square-drive ratchets, extensions, and torque wrenches for use on metric open-end fasteners and fittings.

Installation Notes

Ensure the square-drive tool is fully seated in the crowfoot drive recess before applying torque to prevent slipping. De-energize or depressurize the system being serviced before working on any fittings or fasteners. Follow all applicable ASME and facility safety codes when using crowfoot wrenches with torque wrenches to avoid overload. Do not use cheater bars or impact drivers with this tool.