Drill bit tap size chart3/14/2024 Start with the Bolt and Screw Size You Need Let’s review each in more detail so you can use the chart efficiently. The third and final column tell you what size drill bit to use to cut a hole to tap into. The second column will list the size of the tap drill you need to use. The first column is the size of the screw or bolt you’re using. In a nutshell, a good tap drill chart like the one below or a printable PDF version will have three main columns or sections. Otherwise, let’s run through an overview of the chart so you can use it without confusion. Keep reading!Ĭheck out our full chart below to find all tap drill size equivalents for SAE and metric. Speaking of easy, we even look at a helpful trick, which uses a quick work-around calculation to find tap drill sizes you need. The goal is to make this an easy reference for you, whether you’re a casual DIY’er, hobbyist, student or experienced machinist working in a shop using top of the line Starrett tools. What follows is some practical instruction on how to use a chart for tap drill sizes, including a useful guide for each section of the matrix. With all this, you need a quick and handy reference that takes all these specs into account and lays it all out in a single organized table.īecause it can be complex however, a helpful chart is only of any assistance if you can understand it and read it quickly. That’s because there are so many variables to consider from your screw size, its thread pitch, the substrate you’re drilling into and even whether you require a close fit or free fit connection. It’s almost impossible to know what size tap drill to use for your screw or bolts without a good tap drill chart at hand.
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