Proto J72103M Impact Socket Set 21 Pc 3/4 Drive Metric

Product Description

The PROTO J72103M is a 21-piece metric impact standard socket set built for heavy-duty fastener work on 3/4-inch drive impact tools and hand ratchets. The set spans 19mm to 41mm across 21 individual sizes, covering the large-fastener range common in industrial, fleet, and heavy equipment applications. Each socket is 6-point, which concentrates driving force on the flats of the fastener rather than the corners, reducing rounding on high-torque work. The sockets are constructed from steel and store on a clip rail for organized access at the job site. Licensed mechanics, heavy equipment techs, and industrial maintenance crews are the primary users.

This set is suited for applications where large metric fasteners are the norm: semi-truck and heavy equipment drivetrain work, industrial machinery maintenance, structural fastener installation, and similar high-torque tasks. The 3/4-inch drive size is standard for impact work in Class 6-8 truck service and heavy construction equipment. The 19mm through 41mm range covers wheel hub nuts, axle nuts, and large structural bolts commonly encountered in those settings. The clip rail container keeps the 21 sockets ordered by size and accessible during service.

Key Features

• 21-piece set spanning 19mm to 41mm in a continuous metric progression
• 3/4-inch drive compatible with impact wrenches and hand ratchets
• 6-point socket geometry reduces fastener rounding under high torque
• Steel construction rated for impact use
• Clip rail storage keeps sockets organized and visible
• Complete size run: 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 38, 40, 41mm

Compatibility

Designed for use with 3/4-inch drive impact wrenches and ratchets. Metric sizing makes this set appropriate for heavy equipment, commercial vehicles, and industrial machinery with metric fasteners in the 19mm to 41mm range.

Installation Notes

Install and remove sockets only when the drive tool is not under load. Confirm the socket is fully seated on the fastener before applying torque. Inspect sockets for cracks or deformation before each use and remove any damaged socket from service. Always wear appropriate eye protection when operating impact tools.