Gearwrench 84400D 3/8 Dr Impact Hex Socket 5/16 in

Product Description

The GEARWRENCH 84400D is a 5/16 inch impact hex socket with a 3/8 inch drive, built for professional use in high-torque impact applications. Constructed from chrome molybdenum alloy steel (Cr-Mo), this socket delivers the strength and durability required for repeated impact use without cracking or deforming. A manganese phosphate finish resists corrosion, extending service life in field and shop environments. Off-corner loading geometry reduces the risk of rounding fastener heads. Licensed trades and professional mechanics working in automotive, industrial, and mechanical service applications will find this socket a reliable daily-use tool.

This socket is suited for residential, commercial, and industrial mechanical work wherever 5/16 inch hex fasteners are driven by a 3/8 inch drive impact wrench or ratchet. It is sold individually, making it a practical replacement or addition to an existing socket set. The pin hole allows use with a pin and o-ring retainer system for secure socket retention during overhead or awkward-angle work. Laser-etched and hard-stamped size markings allow fast size identification even in low-light or dirty conditions.

Key Features

• Chrome molybdenum alloy steel (Cr-Mo) construction for impact-rated strength and durability
• Manganese phosphate finish resists corrosion in shop and field use
• Off-corner loading reduces fastener rounding under high torque
• Pin hole compatible with pin and o-ring retainer for secure socket retention
• High-visibility laser-etched markings plus secondary hard-stamped size identification
• Meets or exceeds ASME specifications

Compatibility

Designed for use with 3/8 inch drive impact wrenches, ratchets, and extensions requiring a 5/16 inch hex socket.

Installation Notes

Install and remove with a 3/8 inch drive impact wrench or ratchet. Confirm the socket is fully seated on the drive before applying torque. Inspect the socket for cracks or wear before each use and remove from service if damage is found. Use the pin hole with an appropriate pin and o-ring retainer when working in positions where socket loss is a hazard.

Technical Specifications

• Drive Size: 3/8 inch
• Socket Size: 5/16 inch
• Socket Type: Impact Hex
• Material: Chrome Molybdenum Alloy Steel (Cr-Mo)
• Finish: Manganese Phosphate
• Weight: 0.16 pounds
• Standards: Meets or exceeds ASME specifications
• Sold As: Each

Standard Information

• Brand: GEARWRENCH
• Manufacturer Part Number: 84400D