Proto J49000 20 Piece 3/8 Drive Crowfoot Wrench Set

Product Description

The PROTO J49000 is a 20-piece, 3/8 inch drive open end crowfoot wrench set designed for professional tradespeople who need reliable torque wrench access in confined or obstructed spaces. The set spans both fractional and metric sizes, covering 3/8 through 7/8 inch in fractional increments and 10 through 19 millimeters in metric. Built to ASME B107.21 standards, these crowfoot wrenches attach directly to a 3/8 inch drive torque wrench or extension, allowing technicians to apply measured torque to fasteners that are inaccessible to standard sockets. The set weighs 2.48 pounds, making it a practical addition to any service truck or shop toolbox.

Crowfoot wrenches are a standard tool for HVAC technicians, plumbers, automotive technicians, and industrial maintenance professionals. They are commonly used when tightening or loosening flare fittings, fuel line fittings, hydraulic line connections, and other fasteners where a socket cannot seat fully due to line interference or tight clearances. The J49000 covers the most frequently encountered fractional and metric sizes in a single set, reducing the need for individual crowfoot purchases across common fastener ranges.

Key Features

• 20-piece set includes both fractional (3/8 through 7/8 inch) and metric (10 through 19 mm) open end crowfoot wrenches
• 3/8 inch drive fits standard torque wrenches, ratchets, and drive extensions
• Meets ASME B107.21 standards for hand torque tools
• Open end crowfoot design provides access to line fittings and fasteners in restricted spaces
• Compact set weight of 2.48 pounds for practical portability on the job

Compatibility

Designed for use with any standard 3/8 inch drive torque wrench, ratchet, or drive extension. Compatible with fasteners requiring fractional sizes 3/8 through 7/8 inch and metric sizes 10 through 19 mm.

Installation Notes

Always ensure the crowfoot wrench is fully seated on the drive tool before applying torque. When using crowfoot wrenches with a torque wrench at an angle other than 90 degrees, apply the appropriate correction factor per the torque wrench manufacturer guidelines to maintain accurate torque output. Power down or depressurize the system being serviced before loosening fittings to prevent fluid or gas release. These wrenches are intended for hand torque applications only and should not be used with impact drivers.