What is the M4 Tap Drill Size

m3-m10 drill bit

Have you ever wondered what the tap drill size is for an M4 screw? Well, wonder no more! In this blog post, we’ll give you all the information you need to know about this standard metric screw. Keep reading to learn more.

What is the M4 Tap Drill Size?

The M4 tap drill size is just one of many different tap drill sizes that are used for various applications. Other popular tap drill sizes include the M3, M5, and M6. The right tap drill size must be selected based on the application, as using a tap drill that is too small or too large can damage the workpiece or result in an improperly fitting thread.

drill bit

With a wide range of tap drill sizes available, it is important to select the right one for the job at hand.

What is the Drill Size for the 4 mm Tap?

A 4 mm tap has a drill bit size of 3.4 mm. This is the recommended size for tapping a 4 mm thread in most materials. It is important to use the correct size drill bit when tapping a thread, as too small of a drill bit can cause the tap to break and too large of a drill bit can cause the thread to be oversized and potentially unusable. When in doubt, it is always best to err on the side of a slightly larger drill bit, as this can usually be corrected with a die or file. 

Using the correct size drill bit is just one of many factors that contribute to successful tapping. Other important factors include using the correct tap for the material being tapped, using cutting oil to lubricate the tap, and using a T-Handle or other type of Tapping Guide to keep the tap perpendicular to the workpiece. With proper care and attention to detail, a 4 mm tap can be successfully used to create a clean, accurate thread.

What Size Hole Do You Need to Drill for an M4 Tap?

When it comes to drilling holes, there is always a risk of stripping the threads or breaking the drill bit. This is especially true when tapping holes for threads, as the process requires both precision and care. For an M4 tap, the recommended hole size is 3.4 mm. This will allow for a little bit of wiggle room, which is important when working with smaller taps. 

m3-m10 tap drill sizes

It’s also important to use a sharp drill bit that is designed for metalworking [1]. With the right tools and a little bit of patience, it’s possible to produce clean, accurate threads that will provide a strong foundation for whatever project you’re working on.


The M4 tap drill size is the most common hole size for taps. This size is perfect for tapping threads into metals that have a hardness rating of up to 45 Rockwell C. The M4 tap drill size should be used when you are working with materials that are made from aluminum, brass, copper, or steel.

Leave a Comment

Your email address will not be published. Required fields are marked *