![]() ![]() However, this isn’t always accurate, so it’s best reserved for cases where you don’t have access to a sizing chart or tap drill. If you’re experienced with using taps, you may be able to estimate the right size hole just by looking at the tap itself. ![]() To use one, simply select the correct bit for your tap (based on its diameter and pitch), then drill away. These charts list the recommended hole sizes for various taps, based on their diameter and pitch (the distance between threads).Īnother option is to use a tool known as a “tap drill.” This is a special drill bit that’s designed to create holes of the perfect size for tapping. One option is to use a sizing chart specific to taps. There are a few different ways to go about it. But how can you be sure you’re drilling the right size hole? The hole you drill must be just big enough for the tap to fit through – no more, no less. When it comes to drilling a hole for tapping, size is everything. How Do I Know What Size Hole to Drill for Tapping? In general, it is good practice to use two sizes smaller drill bit for metric taps larger than M6x1. The drill bit should be slightly smaller in diameter than the thread’s major diameter (10 mm). What Size Hole Do I Drill for a 10-24 Tap?Īssuming you are talking about metric, a 10-24 tap is close to size M4x0.7. The tapping drill size for a 10-32 tap is 0.164 inches (4.2 mm). This size drill bit is often used for electronics projects or for drilling very small holes in wood or metal.Ī 10-32 tap has a major diameter of 0.190 inches (4.8 mm) and a pitch of 32 threads per inch (TPI). 0315 inches in diameter and can be used to create small, precise holes in a variety of materials. The 21 drill size is the second smallest standard drill bit size. It’s much easier (and cheaper) to enlarge a small hole than it is to try and fix a big one! How to match a drill to thread tap size Deeper holes will obviously need larger drill bits.įinally, it’s always a good idea to err on the side of caution and go with a slightly smaller drill bit than you think you need. You also have to take into account the depth of the hole you’re trying to create. Softer materials like wood or plastic will require a smaller drill bit, while harder metals will need a larger one. If you’re not sure about the thread count, you can always measure the diameter of the tap and subtract a couple of thousandths of an inch.Īnother thing to consider is the type of material you’ll be tapping into. A 10-32 tap has 32 threads per inch, so you’ll need to use a drill bit that’s slightly smaller than that. ![]() The first thing to think about is the thread count. There are a lot of variables to consider when deciding what size drill bit to use for a 10-32 tap. Deeper holes will need longer bits, so it is important to have the proper length of bit on hand. Finally, take into account the depth of the hole that needs to be drilled. Thirdly, one must decide what type of fit is desired for the finished product.Ī loose fit will require a larger drill bit than a tight fit. Softer materials like aluminum require a smaller drill bit than harder materials like steel. The second thing to consider is the material being tapped. A 10-32 tap will have 32 threads per inch. The first is the thread count, or TPI (threads per inch). There are a few things to consider when determining the size of drill bit needed for a10-32 tap. ![]()
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