Drill hole size for tapped threads

Calculate the proper tap drill size for the most commonly used screws.

Preferred measurements Metric
Inch

Screw Type Thread type Thread size

Full thread %

Data for calculation

Metric Coarse
Nominal diameter	mm in
Thread pitch P	mm in
Threads per inch

Drill hole size

D = mm in

Verify your calculation, maximize potential of your product.

Could you or your engineering team use a refresher course on fastening technology? Visit Bossard Expert Education for available engineering seminars to consider!

Learn more

Want to verify your products are meeting quality standards? Test in one of our 14 certified testing laboratories worldwide (3 with a ISO/IEC 17025 certification).

Learn more

Calculators and Converters available as Mobile App:

Visit the iOS App Store or the Google Play Store.

Do you already know our other engineering services?

We help you master the science of fastening!

New look. Same high-quality content. Our white papers on the science of fastening got a makeover! Check out the brand new design:

Download now your full white paper written by our Assembly Technology Expert Team for free!

Az Ön helyi kapcsolattartója

vissza