What is 1/4 20 Tap Drill Size

tap drill bit of 1 4 20

We’ve all been there. You need to drill a hole in something, but you don’t have the right size drill bit. So you try to make do with what you have, and end up frustrated and with a jagged, poorly drilled hole. If only you had known about the 1/4 20 tap drill size. This little-known drilling hack can save you from hours of frustration – and it’s so simple that anyone can do it.

In this article, we’ll teach you everything you need to know about the 1/4 20 tap drill size, including what it is and how to use it. Keep reading for all the details.

What is the 1/4 20 Tap Drill Size?

The 1/4-20 tap drill size is the most common size for taps and is used to create threads in a range of materials from plastic to steel. This size tap is used for a variety of applications, including creating threads for fasteners such as bolts and screws. The 1/4-20 tap drill size is also common in plumbing applications. Taps and dies are tools that are used to create or repair threads. 

1.4-20 drill tap

How to Use the 1/4 20 Tap Drill Size?

If you’re looking to tap a hole that’s 1/4 inch in diameter and 20 threads per inch, then you’ll need a 1/4 20 tap drill size. This is the size of the drill bit you’ll need to use in order to create the correct-sized hole for your tap. When you’re using a 1/4 20 tap drill size, it’s important to follow the correct steps in order to ensure a proper fit. 

First, you’ll need to select the right drill bit for the job. You can find these at most hardware stores or online retailers. Next, you’ll need to attach the drill bit to your drill. Be sure that the drill is set to the correct speed before beginning. If you’re not sure, it’s always better to err on the side of caution and go too slow rather than too fast.

Once the drill is set up, you can begin drilling your hole. Start slowly and increase the speed as you go. Remember to keep the drill bit perpendicular to the surface to ensure a clean, straight hole. After you’ve drilled the hole, it’s time to start tapping. Again, be sure to go slowly at first and increase the speed as you get comfortable. It’s important to keep the tap perpendicular to the surface as well.

1.4-20 drill tap size

Once you’ve finished tapping the hole, you can remove the drill bit and tap. Be sure to clean up any debris before proceeding with your project.

What Size Hole Should Be Drilled to Tap a 1/4-20 Tapped Hole?

The size of the hole you’ll need to drill depends on the type of material you’re working with. For softer materials like wood or plastic, you can get away with drilling a slightly smaller hole. However, for harder materials like steel or aluminum [1], you’ll need to drill a hole that’s exactly 0.228 inch in diameter.


The 1/4 20 tap drill size is a must-have for anyone who does a lot of drilling. It’s an essential tool for creating clean, straight holes in a variety of materials. 

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