![]() ![]() Using our drill chart that follows below, you’ll get an idea of just how many sizes there are! (And much more when you factor in different types of bits). In fact, most nice sets include anywhere from 12-30 pieces of standard drill bit sizes. Thankfully, we can narrow it down a a lot to some standard sized holes for bolts and screws as well as for bits.įor example, let’s look at the most common applications:Įveryday home repair and construction projects, hobby, marine, farming, woodworking, metal working, aircraft, arts and crafts, commercial building projects, machinery and more.įor each particular application area, you’re going to just see a few dozen or so relevant drill bit sizes. Well, if you base your answer on how many size holes there are in the world, then there would be infinite amount of bits! If you were to look at the most all encompassing collection of multi-purpose, twist-type bits, how many drill bit sizes would there be? How Many Drill Bit Sizes Are There?įirst things first. Scroll down if you just need a quick reference using our drill chart. We’ll discuss these in detail in this article. Many times, we’re just trying to find out the alternative sizes available if you’re working with metric sizes (measured in millimeters) versus standard or empirical values (our familiar fractional inch variety).Ĭheck out our full drill charts below for a quick reference to find all drill size equivalents.įinally, getting the right size drill bit set in your greater tool “chest” will arm you for the various types of projects you’re doing. It may not be totally evident at first glance. Knowing just what size you need to use for the hole you’re making is also important. This will ensure a tight fit and prevent the tap from stripping the thread.Having the right drill bit sizes on hand for your particular repair or building task is essential for any seasoned carpenter or weekend-DIY’er. The correct drill bit will create a hole that is the same size as the tap drill size. It is also used to create threads in metal and other materials. This size tap drill is used for tapping screws and other fasteners. If you are using a 1/4-28 tap drill size, it is important to use the correct size drill bit. Once you know the thread pitch, you can use a chart to find the correct tap drill size. The thread pitch is the distance between threads on the tap. To calculate tap drill size, you need to know the thread pitch of the tap. It is important to use the correct size tap drill so that the threads will be the correct size and will be able to properly engage with the threads on the bolt or screw. This is the size that should be used to create the threads in the hole. The tap drill for a 1/4-28 thread is 0.213. You have successfully drilled and tapped a hole using a 1/4-28 tap!įAQ What Is the Correct Size Tap Drill for a 1/4-28 Thread? Once the tap has gone all the way through the hole, reverse the direction of the drill and back the tap out of the hole. As you tap, the tap will create threads in the hole. Again, start on a low setting and slowly tap 1/4 hole. Next, insert the 1/4-28 tap into the chuck of the drill. Once the drill bit has penetrated the material, increase the speed of the drill and continue drilling until the hole is the correct depth for the tap. Then, slowly drill into the material you are tapping with the drill on a low setting. Start by chucking the drill bit into the drill. To drill the bit with a 1/4-28 tap, you will need: ![]() Faster speeds will require smaller bits while slower speeds will require larger bits. Speed: The speed at which you drill will also affect the size of the bit.Softer materials will require smaller bits while harder materials will require larger bits. Material: The type of material you are drilling into will also affect the size of the drill bit.If the drill bit is too large, it will cause the tap to break. If the drill bit is too small, it will not be able to create the threads needed for the tap. Size: The size of the drill bit is important because it needs to be the same size as the tap.And finally, the speed at which you will be drilling. The next is the type of material you will be drilling into. There are a few things to consider when choosing a drill bit size for a 1/4 tap. How to Choose Drill Bit For a 1/4-28 Tap? ![]()
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