#1 2 13 TAP DRILL SIZE HOW TO#
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In the chart, you simply find the number that relates to your fastener. And the bottom number in the stack is UNSF for “Super Fine”. The second number is the UNF (Unified National Fine) pitch. Specifically, the first number is called the UNC (Unified National Coarse) pitch. In our tap drill chart for Standard sizes, the smaller pitch number on top is the coarser thread type with the other one (or two) being finer. These different pitch values simply relate to how coarse or fine each threading is. For sizes #12 and larger, there are three thread count sizes. This may seem to complicate things but again, a good tap drill chart will list all the possible thread counts to help you match the appropriate tap drill size.Įach fastener size in the Standard specification has two possible threads-per-inch values for screw sizes #1-to-#10. This is just the thread count, or threads per inch (TPI) that the screw you’re using is designed for. You’ll also want to know the Pitch of your screw. This is merely the distance between the two outer ridges of the threading, and is included in the tap drill chart for easy reference. The good news is that each screw size has just one major diameter. You’ll also want to know the bolt’s corresponding Major Diameter. Knowing the size is only the first part of the puzzle. When finding a tap drill size for your fastener in a tap drill chart you need a little more information about your fastener. For the sake of our tap drill chart, we’ll see this range go from 1/4″ up to 1″ to correlate over to our tap drill sizing.

“0” of course is the smallest with “12” being the size just before you get to 1/4″.įor sizes greater than 1/4″, fractional sizing based on the actual diameter of the screw is used. Instead, a numbering system has been created and ranges from 0-12. Standard sizes are broken up into two different classes: a small diameter set and a larger diameter set.įor sizes less than 1/4″, fractional measurements are not used. Of course, you’ll find yourself working with metric bolts often enough. Most of us are all to familiar with Standard sizes since North American uses these primarily from furniture to machines and other equipment. Screw sizes come in two different measurement classifications called Standard (SAE) and Metric – see our complete screw size chart and chart for bolt sizes for more info. When using a tap drill conversion chart, make sure you know what size fastener you’re using. 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.

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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.

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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.

#1 2 13 TAP DRILL SIZE HOW TO#

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.

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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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