![]() The purpose of tapping is to create a threaded hole for a screw or bolt to enter, so always have the bolt ready for a visual comparison that you are headed in the right direction.Īfter the initial hole is drilled, you will first want to de-burr the edge of the hole and remove any sharp edges. Use cutting fluid and regularly sharpen your drill bits, make sure to do your best to keep the drill bit from getting too hot. If possible, use a drill press or a guide for your handheld drill. Any angle created may create problems with both tapping and screwing in bolts. Make sure your drill is completely perpendicular at 90 degrees to the material you are drilling. If drilling into a thin or flexible material, be sure it has solid backing so you do not deform it. Using a center punch with a hammer will help as well by leaving a divot for the bit to rest in. Use masking or painters tape not only to leave a nice area to mark, but also to help keep the step drill bit in one place. You will first need to mark the area to be drilled. Wear safety goggles and consider thick gloves as well. When drilling into metal you will want to mount that material with at least two clamps to reduce the chance of the metal spinning and possibly injuring you. When you have decided on which size drill bit to use, you will then need to move on to the drilling process. ![]() This may change depending on the hardness of the material, so if you are able to drill through a scrap piece first, that may give you a better idea of how you should tap. When you drill any type of material for tapping, be sure to decide beforehand whether you will be tapping with 50% or 75%. ![]() The size of the drill bit you should use for a 1/8-27 NPT (National Pipe Thread) tap depends on whether you want to achieve a tapered (pipe) thread or a straight (mechanical) thread.įor a tapered thread, which is typical for NPT threads, you can use a drill bit with a nominal size of 11/32 inch (0.34375 inches) or a letter size “I” drill bit.įor a straight thread (also known as a mechanical thread), a 1/8-27 straight tap should be used with a drill bit that has a nominal size of 9/32 inch (0.28125 inches) or a letter size “F” drill bit.Other Considerations for Drilling 1/4″ 20 Tap This means that when using a 1/8 NPT tap, you can generally expect it to cut threads to a depth of approximately 3/8 of an inch into the material you are threading. For a 1/8 NPT tap, the standard Depth of Thread is typically around 0.753 and Number of Threads Per is 27. The depth of a 1/8 NPT (National Pipe Thread) tap refers to the distance the tap can cut or create threads into a material. Of all of the types of threads (NPS, NPTF, etc.), NPT threads are used the most commonly in this country. NPT threads (or National Standard Pipe Thread) are the technical standard for screw threads in the United States, most frequently used in threaded pipes and pipe fittings. NPT stands for National Pipe Thread, which is a standardized thread type used primarily in the United States for joining pipes and fittings in various industries, including plumbing, automotive, and industrial applications. What is 1/8 NPT Tap?Ī 1/8 NPT Tap refers to a specific type of tool used in threading applications, particularly for creating threads in pipes, fittings, or other components. So, let’s dive into the world of NPT threading and unveil the mysteries behind the perfect 1/8 NPT tap drill size that will elevate your threading projects to a new level of precision and reliability. Whether you’re looking to thread pipes for plumbing projects or create threaded holes in metal or plastic materials, this guide will be your go-to resource for achieving flawless results. In this comprehensive guide, we will delve into the intricacies of the 1/8 NPT tap drill size, exploring why it’s crucial, how to determine the correct size, and tips for achieving impeccable threaded connections. Precision is the name of the game when it comes to threading tasks, and using the right drill bit size ensures that your threads will fit snugly and securely. Whether you’re a seasoned DIY enthusiast or a professional in the world of machining and threading, knowing the correct drill bit size for a 1/8 NPT (National Pipe Thread) tap is essential. ![]()
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