Proto J5531M 31mm 12-point 3/4 Drive Hand Socket

Product Description

The PROTO J5531M is a 31 mm, 12-point hand socket built for heavy-duty fastener work on 3/4 inch drive ratchets and breaker bars. Constructed from alloy steel with a chrome-plated finish, this standard-length socket measures 2-7/32 inches overall and is engineered to meet ASME B107.110-2012 specifications. The 12-point design provides more engagement positions per rotation, which is useful in tight quarters where swing arc is limited. Licensed tradespeople and experienced mechanics reach for this socket when working on large fasteners in industrial, fleet, or heavy equipment applications.

The J5531M is suited for use in automotive, industrial maintenance, and heavy equipment service environments where 31 mm fasteners are common. The 3/4 inch drive interface pairs with standard 3/4 drive torque wrenches, breaker bars, and impact-rated drive tools where hand-socket use is appropriate. The standard length profile fits most open service bays and bench work scenarios without requiring extensions in most applications.

Key Features

• 31 mm socket size fits large fasteners found in heavy equipment and industrial assemblies
• 12-point geometry allows more wrench positions in restricted-swing areas
• 3/4 inch drive compatible with standard 3/4 drive hand tools
• Alloy steel construction provides high strength and impact resistance
• Chrome-plated finish resists corrosion and simplifies surface cleaning
• Meets ASME B107.110-2012 standard for hand sockets

Compatibility

Designed for use with standard 3/4 inch drive ratchets, breaker bars, and torque wrenches as an OEM-style hand socket for industrial and heavy equipment service applications.

Installation Notes

This socket is intended for use by qualified mechanics and tradespeople familiar with 3/4 inch drive hand tool systems. Ensure the drive tool and socket are fully engaged before applying torque. Do not use hand sockets with pneumatic or hydraulic impact tools unless the socket is rated for impact use. Inspect the socket for cracks or deformation before each use and remove from service if damage is found.