Proto J07521M Impact Socket 3/4 in Drive 21mm 6-pt

Product Description

The PROTO J07521M is a 3/4 inch drive impact socket designed for heavy-duty fastening and removal tasks in professional trade environments. Built with a 6-point hex drive configuration, it accepts a 21mm fastener and measures 1-59/64 inches overall length. The 6-point geometry maximizes contact with fastener flats, reducing the risk of rounding under high torque. This socket is intended for use with 3/4 inch drive impact wrenches and is a standard tool for mechanics, millwrights, and industrial maintenance technicians working on structural, mechanical, and equipment fasteners.

This socket is suited for industrial maintenance, heavy equipment service, fleet repair, and construction applications where 21mm fasteners are encountered. The 3/4 inch drive size is common in heavy-duty shop and field environments where higher torque output is required compared to smaller drive sizes. It is compatible with 3/4 inch drive impact wrenches, torque wrenches, and breaker bars. The compact overall length of 1-59/64 inches makes it practical in moderate-clearance situations.

Key Features

• 3/4 inch drive size for high-torque impact applications
• 21mm socket size for metric fastener compatibility
• 6-point hex drive geometry reduces fastener rounding under load
• Overall length of 1-59/64 inches for use in moderate-clearance spaces
• Designed for use with 3/4 inch drive impact wrenches and manual drive tools

Compatibility

Designed as a standard 3/4 inch drive impact socket for use with 3/4 inch drive impact wrenches, torque wrenches, and breaker bars requiring a 21mm 6-point hex socket.

Installation Notes

Installation is typically performed by mechanics, millwrights, or maintenance technicians using 3/4 inch drive impact or hand tools. Confirm the socket is fully seated on the drive anvil before applying torque. Inspect the socket for cracks or wear before each use, and do not use hand-rated sockets with impact tools. Follow applicable workplace safety and torque specifications provided by the equipment manufacturer.