Apex 84389 Impact Bit Socket 3/8 in Drive Hex 4MM

Product Description

The APEX 84389 is a standard-length metric impact bit socket designed for 3/8 inch drive tools. Built from chrome molybdenum alloy steel, it delivers the strength and durability required for high-torque impact applications. A manganese phosphate coating resists corrosion during regular shop and field use. Laser-etched markings provide clear size identification, and a secondary hard stamping backs up readability over the life of the tool. Off-corner loading geometry reduces fastener rounding under load. At 0.14 pounds and 2.36 inches in length, this socket is compact enough for tight-access fastening tasks.

This socket is suited for professional use in automotive, mechanical, and general trades where 3/8 inch drive impact tools are standard equipment. The 4 MM hex bit socket size covers a range of fasteners common in engine bay work, HVAC equipment, and machinery assembly. It is sold individually, making it a practical replacement or addition to an existing impact socket set.

Key Features

• Chrome molybdenum alloy steel construction for high-torque impact resistance
• Manganese phosphate coating for corrosion resistance
• Laser-etched size markings with secondary hard stamping for lasting identification
• Off-corner loading design reduces fastener rounding
• Standard length at 2.36 inches for general-access fastening
• Sold individually — no minimum set purchase required

Compatibility

Designed for use with 3/8 inch drive impact wrenches, ratchets, and extension bars. Fits 4 MM hex fastener heads in standard metric applications.

Installation Notes

Install and remove using a 3/8 inch drive impact wrench or ratchet rated for the fastener torque spec at hand. Ensure the socket is fully seated on the drive before applying torque. Inspect the socket for cracks or wear before each use, and replace any damaged socket immediately. Do not use impact sockets with non-impact hand tools in applications that exceed the tool rating.

Technical Specifications

• Drive Size: 3/8 inch
• Bit Type: Hex
• Bit Size: 4 MM
• Length: 2.36 inches
• Weight: 0.14 pounds
• Material: Chrome molybdenum alloy steel
• Coating: Manganese phosphate
• Measurement System: Metric
• Socket Style: Standard
• Sold As: Each
• UPC: 099575843891

Standard Information

• Brand: APEX
• Manufacturer Part Number: 84389