Proto J07521MT Impact Socket 3/4 in Drive 21mm

Product Description

The PROTO J07521MT is a 3/4 inch drive impact socket sized at 21mm, built for use with high-torque pneumatic and electric impact wrenches in professional trade and industrial settings. Constructed from alloy steel, it delivers the strength and durability required to withstand repeated high-impact cycles without cracking or deforming. The 12-point design allows for easier engagement on fasteners in tight spaces, making it well suited for heavy-duty fastening and removal tasks. At 1-29/32 inches overall length, it fits standard 3/4 inch drive impact tools used by mechanics, ironworkers, millwrights, and maintenance technicians across a wide range of industrial and commercial applications.

This socket is intended for use in demanding mechanical and industrial environments where 3/4 inch drive tooling is standard. Typical applications include structural steel assembly, heavy equipment maintenance, fleet service, and industrial machinery repair. The 21mm size is commonly encountered on metric fasteners found on commercial vehicles, agricultural equipment, and large-frame machinery. The 12-point configuration allows the socket to engage hex fasteners at 30-degree increments, providing flexibility in confined work areas.

Key Features

• 3/4 inch drive size for use with standard heavy-duty impact wrenches and drive tools
• 21mm socket size for metric fastener applications
• 12-point design allows engagement at multiple positions for access in tight spaces
• Alloy steel construction resists cracking and deformation under high-torque impact use
• Compact overall length of 1-29/32 inches suits a wide range of installation depths

Compatibility

Designed as a standard 3/4 inch drive impact socket compatible with 3/4 inch square drive impact wrenches and drive handles meeting common tool industry sizing conventions.

Installation Notes

Installation and removal of fasteners using this socket should be performed by qualified mechanics or maintenance technicians familiar with impact tooling and torque requirements. Ensure the impact wrench is set to the appropriate torque setting for the fastener application before use. Inspect the socket for cracks or wear before each use and replace if any damage is found. Do not use impact sockets with standard ratchets or hand-drive tools not rated for impact use.