Printable Tap Drill Chart PDF [100% Free]

free tap drill chart

A tap drill chart is a document that specifies the right size of the drill. This then can be used to create the correct sized opening to complement tap dimensions. In matching pairs of female and male thread, it is the perfect key that tightly secure together. However, for sizes of the drills only, the specific drill chart is important.

Tap is needed to create female screw threads. To make a male screw thread, the die is needed. It contains a tiny split on its side that permits the adjustment of the screw. Moreover, for different degrees of sharpness and materials, it allows it to be bit modified.

Converting Drill bit sizes:

At first, you have to take look on the tap drill chart for the accompanying drill bit size for a tap. Tap drill charts provide you the right tap for drilling in both measurements of millimeters and inches. You will require taps for manufacturing a hole to be made with a female screw thread during building and fastening. You can use different ways to make this hole. But the most common way use to thread the hole is a tap.

All standard size taps come with at least one drill bit size. The skinniest area of the male screw is bit smaller than this. It is also smaller than the thickest area of that screw at the same time. In order to find the right sized drill and tap size, you have to make sure that the screws that you will be using are fine or coarse. This is very helpful in thread spacing because it identifies the right drill bit size. In addition, depending on how big a hole is, the tap makes varying depths between 50 percent and 100 percent. You may also like Reward Chart Template.

How to use the tap drill chart?

The tap drill chart is used by the installer and the manufacturer to identify what taps and drills sizes to select for a combination that result in female screw guides. In this way, workers and homeowners add the components in time that completes the predrilled items. This chart depends on comparing the size of a drill bit in the chart. It figures out what drill bit makes the right sized hole. After that, manufacturer drill the hole of the accurate length, then put the tap, and start creating the guides. By twisting the taps, it carves out guides of the right size. This chart also works effectively with wood and metal components. With the correct use of taps and charts, the guides are built for wood and machine screws.

There are also imperial charts that enable you to compare diameters in inches instead of in millimeters. It serves the same purpose as the tap drill chart does but this chart is important if you are facing with guides that cover over an inch sized drill bits. Bear in mind that depth varies from chart to chart. This means metalworkers should know what depth they require in order to use one chart for making guides.

Let us discuss a simple way to use them;

  • At first, re-drilling the existing hole for creating a fresh thread inside a hole. For this, look at the tap drill chart to find the correct size and start drilling.
  • Next, on the top of the holder, position the square and tighten it.
  • Now, place the tip of tap inside the hole. Ensure that the tap is positioned in a perpendicular direction to the hole.
  • Press down and turn the tap inside the hole and then the tap cuts the thread in the wall of hole.
  • After making at least 2 full turns, turn the tap backwards around half or three-fourth of a turn. May be at first you need 3 instead of 2 turns.

If you are using dies then remember that they will work in the same way. The dies are only applied on a round rod not a drilled hole; it is the only difference between them. Also, the size of the dies you choose should be the same as the size of rod. You should also check Gantt Chart Template.

How to read a tap drill chart?

This chart refers to different drill sizes and diameters. You just have to match the size of drill with the right characteristics. There are 4 common types of taps;

  1. Taper tap: It is used to cut holes that travel through a hole.
  2. Bottoming tap: It works on threads that only halfway go via a hole.
  3. Plug taps: They are the smallest and used for small diameter holes.
  4. Machine screw taps: You can use it when you require threads to go through entirely to the bottom.


In conclusion, a tap drill chart is a useful tool for installers and the manufacturers. They used it to determine what taps and drills sizes to select for a combination that result in female screw guides.

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