# What Do the Numbers on a Power Drill Mean? Unlock the Secrets to Understanding Your Drill

Written By John Gibbs
» Power Tools » Drill » Drill Bits » What Do the Numbers on a Power Drill Mean? Unlock the Secrets to Understanding Your Drill

Have you ever wondered what the numbers on the side of your drill mean? Understanding the meaning behind drill measurements is important for any DIYer or professional contractor. It can help you choose the right drill for the job and make sure you are using it correctly. So, what do the numbers on a drill mean? This article will explain the various drill measurements, how they are used and when you should use a certain size drill bit.

## Overview of Drill Measurements

• Drill Size: Drill size is measured in inches or millimeters, depending on the size and type of drill. The diameter of the drill is measured across the flutes, or cutting edges, of the drill.
• Drill Depth: Drill depth is measured from the top of the drill bit to the bottom. It tells the maximum depth at which the drill can penetrate.
• Shank: The shank is the part of the drill bit that fits into the drill. It is measured in inches or millimeters and is usually the same size as the drill diameter.
• Cutter Length: Cutter length is the length of the cutting edges of the drill bit, measured from the tip to the back of the drill.
• Drill Torque: Drill torque is the amount of rotational force that a drill can apply to a material. It is measured in inch-pounds or Newton-meters and is important to consider when drilling into hard materials.

## What Do the Numbers on a Drill Mean?

### What Is Drill Torque?

Drill torque is the measure of the rotational force of a drill, or the amount of twisting power it produces. It is usually expressed in inch-pounds (in-lb) or Newton-meters (Nm).

### What Do the Numbers on a Cordless Drill Mean?

The numbers on a cordless drill refer to the size of the drill bit that is being used. The size is usually given in terms of the diameter of the bit, expressed in inches or millimeters. For example, a drill bit labeled “1/4” is a quarter of an inch in diameter.

### What Do the Numbers on a Drill Gun Mean?

The numbers on a drill gun refer to the size of the drill bit that is being used, just like with a cordless drill. The size is usually given in terms of the diameter of the bit, expressed in inches or millimeters.

### What Is the 1 and 2 Setting On a Drill?

The 1 and 2 settings on a drill refer to the speed of the drill bit. The 1 setting is usually the slowest speed, while the 2 setting is usually the fastest.

### What Is Torque in Cordless Drills?

Torque in cordless drills is the measure of the rotational force of the drill, or the amount of twisting power it produces. It is usually expressed in inch-pounds (in-lb) or Newton-meters (Nm).

### What Is a Good Torque for Cordless Drill?

A good torque for a cordless drill depends on the type of material that is being drilled and the size of the drill bit. Generally, a higher torque is better for drilling into harder materials and larger drill bits.

### What is the Purpose of the Numbers on a Drill?

The numbers on a drill refer to its size—they indicate the drill bit’s diameter and length. Drill bits are available in standard sizes, and the numbers indicate which size you need for a specific job. Different drill bit sizes will create different sized holes. Knowing the purpose of each number on a drill can help you select the correct drill bit for the task.

### What type of drill bit sizes can be found?

Drill bits come in a variety of sizes, both metric and standard. The most common sizes are:

• Fractional sizes: 1/16”, 1/8”, 3/16”, 1/4”, 5/16”, 3/8”, 7/16”, 1/2”, 5/8”, 3/4”, 7/8”, 1”
• Letter sizes: A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z
• Metric sizes: 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, 8.0mm, 9.0mm, 10.0mm, 12.0mm, 14.0mm, 16.0mm, 18.0mm, 20.0mm

Specialty bits are also available such as spade bits, brad point bits, and countersink bits.

### What is the difference between standard and metric drill bit sizes?

• Standard drill bit sizes
• In the United States and Canada, the standard drill bit sizes are expressed using the imperial system, which is measured in fractional inches.
• Standard drill bit sizes are expressed in fractions of an inch, like 1/16, 1/8, 3/16, 1/4, 5/16, 3/8 and so on.

• Metric drill bit sizes
• Metric drill bit sizes are expressed in millimeters, like 1.0, 1.2, 1.5, 2.0, 2.5, and so on.
• Metric drill bit sizes are slightly different than standard sizes, as the units of measurement are in millimeters instead of fractions of an inch.

### How do I determine the correct size drill bit for my project?

Step 1: Identify the size of the hole you need to drill. Measure the inner diameter of the hole in millimeters or inches.

Step 2: Choose the drill bit size that is slightly smaller than the inner diameter of the hole. The drill bit should be the same size as the inner diameter of the hole or slightly smaller.

Step 3: Select the correct drill bit size for your project. The most common drill bit sizes are:

• Metric drill bits – range from 0.5mm to 13mm
• Fractional drill bits – range from 1/64” to 1/2”
• Number drill bits – range from size 80 to 1
• Letter drill bits – range from A to Z

Step 4: Use the correct drill bit for the material you are drilling. Different materials require different types of drill bits. For example, metal requires a high-speed steel bit, while wood requires a brad point bit.

Step 5: Use the correct speed. Different materials require different speeds when drilling. Always check the manufacturer’s instructions before using a drill.

Step 6: Use the correct technique. When drilling, make sure to hold the drill firmly and apply even pressure. This will help to ensure accuracy and reduce the risk of damaging the material.

### Are There Any Safety Considerations When Using a Drill?

Yes. When using a drill, it is important to take the necessary safety precautions and to follow all safety protocols. Here are some safety considerations to keep in mind:

• Always wear appropriate safety gear, such as gloves, protective eyewear, and a dust mask.
• Do not overreach or attempt to reach something that is out of your reach.
• Make sure the drill bit is sharp and securely attached to the drill.
• Do not use the drill in wet or damp locations.
• Keep your hands away from the bit when it is in use.
• Maintain a secure footing when using a drill.
• Always unplug the drill when not in use.

By following these safety considerations, you can ensure that you and those around you remain safe while using a drill.

## Conclusion

Understanding the measurements and numbers on a drill can be overwhelming at first, but with a little knowledge, it is easy to interpret. Knowing the basics of drill measurements is essential to make sure you are using the right tool for the job. Knowing the size of the drill bit, the speed of the drill, and the power of the motor are all important elements to consider when selecting a drill. With the information in this article, you can make the right decision for your next project.