Forming Tap Drill Size — Your Quick Guide

Choosing your tap drill

The Importance of Forming Tap Drill Size

When it comes to manufacturing, tapping is an essential process. It involves creating threads in materials to assemble different parts. Achieving the right tap drill size is essential for successful tapping. The right size ensures that the parts fit together properly and securely.

What is a Tap Drill Size?

Tap drill size is the diameter of the hole used to create new threads in a material. It is usually measured in millimeters (mm) or inches. The size of the hole will depend on the type and size of the thread being created. This size is necessary for the tap to cut the required threads in the material.

Calculating the Size of a Tap Drill

It’s not too difficult to determine the tap drill size for a specific thread. It entails deducting the thread pitch from the thread’s main diameter. An M10 x 1.5 thread, for instance, has a pitch of 1.5mm and a main diameter of 10mm. As a result, 8.5mm would be the tap drill size for this thread.


The Effect of Incorrect Tap Drill Sizes

Using the wrong tap drill size can have several negative effects. It can cause the thread to be weaker than it should be, making it more likely to break.

It can also cause the thread to be too shallow, which will make it difficult to assemble the parts correctly. This can lead to parts becoming loose, which can cause operational issues.


It is essential to get the tap drill size right in order to create successful threads in the material. It is relatively easy to calculate the tap drill size for a particular thread, but it is important to get it right.

Using the wrong tap drill size can have serious consequences, so it is important to take the time to get it right.

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