Hitachi

Hitachi 728226 5/16-Inch Auger Drill Bit

3.9 (2 reviews)

Precision Drilling for Wood, Plastic, and MetalThe Hitachi 728226 Auger Drill Bit is engineered for precision and versatility. Its unique twist design ensures smooth cutting and efficient debris removal, making it ideal for a variety of materials. Size: 5/16-inch Length: 8-inch Material: Ultra-s...

$9.99*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

Precision Drilling for Wood, Plastic, and Metal

The Hitachi 728226 Auger Drill Bit is engineered for precision and versatility. Its unique twist design ensures smooth cutting and efficient debris removal, making it ideal for a variety of materials.

  • Size: 5/16-inch
  • Length: 8-inch
  • Material: Ultra-strong steel
  • Application: Wood, plastic, and metal
  • Features: Self-feeding tip, wide throat

Key Features

Hitachi Power Tools has renamed to Metabo HPT. Same great tools, with only a new name.

5/16-inch by 8-inch auger drill bit with 5/16-inch shank diameter

Precision design creates less wobble in the drill and bit

Self-feeding tip and wide throat leave cleaner holes

Ideal for wood, plastic and metal

Comes with a 30-day limited warranty

5/16" x 8" Auger Bit

5/16" shank

Precision design

High speed steel

Wood or Plastic

Specifications

Brand
Hitachi (now Metabo HPT)
Type
Auger Drill Bit
Diameter
5/16-inch
Length
8-inch
Shank Diameter
5/16-inch
Material
High speed steel
Intended Use
Wood, Plastic, Metal
Design Feature
Precision design, Self-feeding tip, Wide throat
Warranty
30-day limited warranty

Pros & Cons

👍 Pros

  • The 5/16-inch by 8-inch dimensions are suitable for various drilling tasks in wood and plastic.
  • Features a precision design that aims to create less wobble during drilling, improving accuracy.
  • Equipped with a self-feeding tip, allowing for easier initiation of holes without excessive force.
  • A wide throat design is incorporated to facilitate cleaner holes by efficiently removing debris.
  • Constructed from high-speed steel, indicating durability and resistance to wear during use.

👎 Cons

  • The 5/16-inch shank diameter might not be compatible with all standard drill chucks, requiring specific tool compatibility.
  • The drill bit is primarily recommended for wood, plastic, and metal, but may not be optimal for harder materials like concrete or stone.
  • The 30-day limited warranty is relatively short, which might be a concern for long-term product reliability.
  • The product focuses solely on drilling and does not offer versatility for other tasks such as driving screws.
  • Precision design helps reduce wobble, but the overall stability of the drill bit depends on the user's technique and the drill's condition.

Frequently Asked Questions

This 5/16-inch auger drill bit is ideal for drilling into wood, plastic, and metal.
The drill bit is 5/16-inch in diameter and 8-inches in length, with a 5/16-inch shank diameter.
Yes, its wide throat design is specifically intended to leave cleaner holes by efficiently removing drilled material.
The Hitachi 5/16-inch auger drill bit comes with a 30-day limited warranty.
This auger drill bit is constructed from high-speed steel, offering durability for its intended applications.
Yes, Hitachi Power Tools has been renamed to Metabo HPT; however, the tools themselves remain the same.