Proto J5212S 3/8 in Drive 8-point Hand Socket

Product Description

The PROTO J5212S is a 3/8 inch drive, 8-point hand socket designed for turning square nuts in professional mechanical and maintenance applications. Built from alloy steel with a chrome-plated finish, this standard-length socket measures 1-5/64 inches overall. The 8-point geometry provides full engagement on square fasteners, reducing the risk of rounding under load. At 0.07 pounds, it is a lightweight tool suited for both frequent hand-use and inclusion in a socket set. It meets ASME B107.1 standards, confirming dimensional and performance compliance for professional-grade hand tools.

The J5212S is intended for use in industrial maintenance, mechanical assembly, and field service where square-head fasteners are encountered. Square nuts appear in older mechanical equipment, structural assemblies, agricultural machinery, and various utility installations. This socket is appropriate for use by millwrights, maintenance mechanics, pipefitters, and general tradespeople who regularly encounter square fasteners that standard hex sockets cannot properly engage.

Key Features

• 8-point socket geometry engineered for full contact on square nuts
• 3/8 inch drive fits standard 3/8 inch drive ratchets, extensions, and breaker bars
• Alloy steel construction for strength under torque load
• Chrome-plated finish for corrosion resistance and easy cleaning
• Standard length at 1-5/64 inches overall for general-access fasteners
• Meets ASME B107.1 dimensional and performance standards

Compatibility

Designed for use with standard 3/8 inch drive ratchets, extensions, and torque wrenches. Intended specifically for square nuts, not hex fasteners.

Installation Notes

This socket is installed and removed by hand using a 3/8 inch drive ratchet or breaker bar. Always ensure the drive tool and socket are fully seated before applying torque. Inspect the socket for cracks or wear before each use and remove from service if damage is found. This tool is not tether capable and should not be used in overhead or elevated work where drop hazards require tethered tooling.