In the following drill bit chart are the typical fractional sizes this kind of set would include. Say, for example, a typical 29-piece set. One that could serve any of the above mentioned disciplines well. Various bit types exist for a wide variety of applications, and in particular what material you’re drilling into.įor the sake of simplicity, let’s look at a basic multi-purpose set. 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 bit to some standard sized holes and 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 chart 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 size drill bit should be used for drilling the initial hole that will then be tapped.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. Lastly, the recommended tap drill size is provided for each standard tap size. The drill size chart contains tools up to 1.5 inches in diameter, but larger tools are also commonly used.įor each thread count, the equivalent thread pitch is provided and for metric taps, the approximate thread count is shown based on the pitch. The metric system uses the thread pitch, which is the distance between threads, measured in millimeters. In the fractional and screw size systems, the thread count is used, measured in threads per inch, such as UNF threads and UNC threads. The thread spacing can be coarse or fine, will be listed after the diameter. A screw size number corresponds to a diameter which is larger for a higher screw size. ![]() Fractional sizes are listed in inches, metric sizes are listed in millimeters following the letter "M". The tap size chart is a table that lists standard size taps, specifying the diameter and thread spacing, for fractional, metric, and screw sizes. The decimal equivalents of the diameters are shown in both English and Metric units. The wire gauge and letter systems refer to tool diameters that increase as the wire gauge decreases from #107 to #1 and then continues from A to Z. Fractional sizes are measured in inches, while metric sizes are measured in millimeters. The drill size chart is a table list standard size drill bits in several measurement systems, including fractional, metric, wire gauge number, and letter. People would need a drill size chart and tap size chart to determine the proper tap drill for a certain thread size or proper tap for an existing hole. One of the most common ways to produce the thread holes is to drill a hole of the right size with a drill bit and tap it with a tap. When manufacturing custom CNC machining parts, holes with screw threads are often required for fastening the finished part or facilitating the building. ![]() What is the Drill and Tap Size Chart and Why to Use Them? When it comes to the selection of drill bit sizes and tap sizes, there are standard drill and tap size chart for reference. Drilling is a process of producing a hole while tapping is a technique used to cut a thread inside a hole, so the drill bit and tapping tool are often used in sequential to fabricate CNC parts with thread holes.
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