Proto J5431MH 31mm 6-point 1/2 in Drive Hand Socket

Product Description

The PROTO J5431MH is a 31 mm, 6-point hand socket designed for 1/2 inch drive ratchets, breaker bars, and torque wrenches. Built from alloy steel with a chrome-plated finish, this standard-length socket delivers reliable torque transfer on hex fasteners without rounding corners. The 6-point design concentrates force on the flats of the fastener rather than the corners, reducing the chance of fastener damage during high-torque applications. At 0.53 pounds, it is solid and well-balanced for professional hand-tool use. It meets ASME B107.5M standards and carries a limited lifetime warranty, making it a practical choice for shop, fleet, and field mechanics.

This socket is suited for automotive, heavy equipment, industrial maintenance, and general mechanical work where a 31 mm fastener size appears. The 1/2 inch drive connection is the standard for mid-range to heavy-duty fastener work, compatible with the wide range of 1/2 inch drive tool sets already in most professional toolboxes. Standard length keeps it accessible in moderately confined spaces without requiring an extension in most common applications.

Key Features

• 31 mm socket size with 6-point geometry for maximum contact on fastener flats
• 1/2 inch drive compatible with standard ratchets, breaker bars, and torque wrenches
• Alloy steel construction for high-torque durability
• Chrome-plated finish resists corrosion and simplifies cleaning
• Meets ASME B107.5M standards for socket dimensions and performance
• Limited lifetime warranty

Compatibility

Designed as an OEM-style replacement or direct addition to any 1/2 inch drive hand-tool system requiring a standard-length 31 mm 6-point socket.

Installation Notes

Installed by mechanics, maintenance technicians, and trade professionals using standard 1/2 inch drive hand tools. Ensure the socket is fully seated on the fastener and drive tool before applying torque. Inspect the socket for cracks or wear before use on high-torque fasteners. This socket is not tether capable and should not be used in overhead applications where a dropped tool presents a hazard.