Proto J5538M 38mm 12-point 3/4 Drive Hand Socket

Product Description

The PROTO J5538M is a 38 mm, 12-point hand socket designed for heavy-duty fastener work requiring a 3/4 inch drive. Constructed from alloy steel with a chrome-plated finish, this standard-length socket measures 2-13/32 inches overall. The 12-point geometry allows for six engagement positions per rotation, making it well suited for work in tight or partially obstructed spaces. It meets ASME B107.110-2012 and SAE AS955 dimensional and performance standards. Mechanics, industrial maintenance technicians, and service professionals working on large-diameter fasteners will find this socket appropriate for both hand-drive and torque-wrench applications.

This socket is intended for use with 3/4 inch drive ratchets, breaker bars, and torque wrenches. Its 38 mm socket size makes it applicable to large fasteners found in heavy equipment, truck and fleet maintenance, industrial machinery, and structural assemblies. The standard length profile fits most common drive tool configurations without the need for extensions in open-access applications.

Key Features

• 38 mm socket size for large-diameter fasteners
• 12-point design allows multiple engagement positions in confined areas
• 3/4 inch drive compatible with standard heavy-duty drive tools
• Alloy steel construction for strength under high-torque loads
• Chrome-plated finish resists corrosion and simplifies cleaning
• Meets ASME B107.110-2012 and SAE AS955 standards

Compatibility

Designed for use with standard 3/4 inch drive ratchets, breaker bars, and torque wrenches. Compatible with any 3/4 inch square drive tool accepting standard hand sockets.

Installation Notes

This socket is installed and removed by hand or with a 3/4 inch drive tool — no permanent mounting is required. Ensure the socket is fully seated on the fastener before applying torque to prevent rounding. Inspect the socket and drive tool for cracks or wear before use under high-load conditions. Not rated for impact driver use unless paired with an impact-rated adapter.