Drill Size Chart and Tap Size Chart

The drill bit is typically rotated at high speeds and pressed into the material to remove material and form the hole. The size of the drill bit is chosen based on the desired hole diameter.Tapping is the process of creating internal threads inside a drilled hole. A tap is used, which is a cutting tool with threads that match the desired thread type and size. The tap is rotated and pressed into the hole, cutting into the material to form the threads. Taps come in different sizes and thread types to match specific requirements. When it comes to the selection of drill bit sizes and tap sizes, there are standard drill and tap size chart for reference.

What is the Drill and Tap Size Chart?

A drill and tap size chart is a reference guide that provides information on the recommended drill bit size and tap size for specific thread types and diameters. It helps in selecting the appropriate tools for drilling holes and creating threads during machining or assembly processes.

The chart typically consists of a table or grid format, with columns representing different thread sizes or types, and rows indicating the corresponding drill bit and tap sizes. The drill bit size is specified in terms of diameter, while the tap size may include information about the thread type, pitch, and diameter.

The purpose of a drill and tap size chart is to ensure that the drilled holes and threads are compatible and properly sized for secure and accurate fastening. It assists in selecting the correct drill bit size to create a hole with the appropriate diameter to accommodate the desired thread size. The recommended tap size ensures that the internal threads are correctly formed to match the corresponding external thread.

By referring to the chart, engineers, machinists, or fabricators can quickly identify the appropriate drill bit and tap sizes for a specific thread size or type. This saves time, promotes accuracy, and helps ensure proper fit and functionality of threaded connections.

It’s important to note that drill and tap size charts are based on industry standards and common practices. However, specific applications may have unique requirements, such as special thread forms, materials, or tolerance specifications. In such cases, it’s recommended to consult relevant standards, engineering references, or seek expert advice for accurate drill and tap size selections.

Why To Use Drill and Tap Size Chart？

A drill and tap size chart provides a reference guide for selecting the appropriate drill bit size and tap size when performing drilling and tapping operations. It lists the corresponding sizes for various thread types and diameters, helping to ensure proper hole preparation and thread creation.

Here’s why drill and tap size charts are useful:

Remember, while drill and tap size charts provide general guidelines, specific applications may have unique requirements. It’s important to consider factors such as material type, thread engagement requirements, and tolerance specifications when selecting drill bit and tap sizes. Always refer to appropriate industry standards, engineering references, or consult with experts for accurate drill and tap size requirements for your specific application.

The Types of Drill Bit Sizes

List of Drill and Tap Sizes

1.Drill Bit Sizes (Metric)

Here is an expanded drill bit sizes chart that includes both metric and imperial measurements, ranging from 0.05mm to 38mm:

2.Drill Bit Sizes (English)

3.Tap Sizes (Metric)

Here are common tap sizes in metric measurements:

4.Tap Sizes (English)