5mm Tap Drill Size — Your Quick Guide

Grease application for pre-threaded hole

Are you planning to tap a 5mm hole for a metric thread? Do you know the tap drill size for a 5mm tap? If not, then this blog post is for you!

Here, our engineers will discuss what a 5mm tap drill size is and its drill bit size. We will also look at what size hole you need for an M5 tap, and provide you with a metric tap and drill bit size table as a reference. Let’s get started!

What is a 5mm Tap Drill Size?

5mm tap drill size is the size of the hole that needs to be drilled when tapping a 5mm thread. This size is determined by the relationship between the drill bit size and the tap size.

When a 5mm tap is used, the hole that needs to be drilled is slightly smaller than 5mm, so that the tap can create a thread in the hole.

What Drill Bit Size Do I Need for a 5mm Tap?

The size of the drill bit you need for a 5mm tap depends on the type of tap you are using. If you are using a standard tap, then you need to drill a 4.4mm hole for the tap. If you are using a bottoming tap, then the hole size should be 4.2mm.

m8

What Hole Size Do I Need For an M5 Tap?

The size of the hole that you need for an M5 tap is the same as for a 5mm tap,  4.4mm for a standard tap, and 4.2mm for a bottoming tap.

Metric Tap and Drill Bit Size Table

Tap Size

Drill Size (Standard Tap) Drill Size (Bottoming Tap)
M2 1.6mm

1.4mm

M2.5

2.0mm 1.85mm
M3 2.5mm

2.35mm

M4

3.3mm

3.2mm

M5

4.4mm 4.2mm
M6 5.2mm

5.0mm

M8

6.8mm 6.6mm
M10 8.4mm

8.2mm

M12

10.2mm

10.0mm

Conclusion

In this blog post, we discussed all the details you need to know about the 5mm tap drill size. We also provided a metric tap and drill bit size table as a reference. Make sure to follow the recommended drill bit size for the tap size you are using to ensure the threading process goes smoothly!


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