29 Drill Bit Size: The Ultimate Guide


Drilling is a common activity that requires the use of various tools such as drills and drill bits. One of the most important factors in choosing the right drill bit is its size. In this article, we will be discussing the 29 drill bit size, its uses, and other important information that can help you in your drilling projects.

What is the 29 Drill Bit Size?

The 29 drill bit size is a fractional size that measures 0.136 inches or 3.45mm in diameter. It is commonly used in drilling holes for #8 screws and bolts. It is also used in woodworking, metalworking, and other industries that require precise drilling.

Uses of the 29 Drill Bit Size

The 29 drill bit size is commonly used in various applications such as:

  • Drilling holes for #8 screws and bolts
  • Woodworking projects that require precise drilling
  • Metalworking projects that require precise drilling
  • Creating holes for jewelry-making

Types of 29 Drill Bits

There are different types of 29 drill bits that are available in the market. These include:

  • High-Speed Steel (HSS) Drill Bits – These are the most common type of drill bits that are used in drilling various materials such as wood, metal, and plastic. They are durable and can withstand high-speed drilling.
  • Cobalt Drill Bits – These are made of cobalt steel and are more durable than HSS drill bits. They are ideal for drilling hard materials such as stainless steel and titanium.
  • Carbide Drill Bits – These are made of carbide and are the most durable type of drill bits. They are ideal for drilling hard materials such as ceramics and hardened steel.

How to Choose the Right 29 Drill Bit

When choosing the right 29 drill bit, there are several factors that you need to consider such as:

  • The material that you will be drilling
  • The type of drill that you will be using
  • The depth of the hole that you need to drill
  • The speed at which you will be drilling

Tips for Using the 29 Drill Bit

When using the 29 drill bit, here are some tips that you need to keep in mind:

  • Always wear safety goggles to protect your eyes from debris
  • Use a lubricant to reduce friction and heat
  • Start drilling at a slow speed and gradually increase the speed
  • Use a drill press or a guide to ensure that the hole is drilled straight

How to Maintain the 29 Drill Bit

To ensure that your 29 drill bit lasts longer, here are some maintenance tips that you need to follow:

  • Keep the drill bit clean and dry after each use
  • Store the drill bit in a dry and cool place
  • Sharpen the drill bit regularly to maintain its cutting edge
  • Replace the drill bit if it becomes dull or damaged


The 29 drill bit size is an important tool that is used in various industries. By understanding its uses, types, and maintenance tips, you can ensure that you choose the right drill bit for your project and that it lasts longer. Always remember to practice safety measures when using any tool and follow the manufacturer’s instructions for best results.