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ThreadKing is the ultimate reference and calculator for threads.

It contains all the information for Metric and UN Taps, Fine/Course Threads, Drill/Tap sizes, Pipe Tap sizes, and Thread Dimension.

ThreadKing is also a handy calculator for finding the right drill size in Cutting Tap and Forming Tap based on Thread Percentage. Besides, it calculates RPM and feed rates in Cutting Tap for different materials

- Drill/Tap Chart available in drill size standards: Fractional, Letter, Wire Gauge and Metric
- Course and Fine Thread
- Pipe Thread Chart
- Cutting Tap Calculator based on Thread Percentage
- Forming Tap Calculator based on Thread Percentage
- Cut Tapping RPM and Feed Rate Calculator
- Thread Dimension Information: Major Dia, Pitch Dia, Minor Dia, Pitch, Thread Height, Threads per Inch
- Formular and Equations for Reference

What’s New

Version 1.1

This app has been updated by Apple to use the latest Apple signing certificate.

- Updated Forming Tap Calculator

Ratings and Reviews

4.8 out of 5
10 Ratings

10 Ratings

Mech01us ,

A must have app

It has literally everything for threads, drill and taps.. It's a complete app.. So easy to use and well designed ! Thanks !!

MJLong1980 ,

Great app!

I've used it twice since I downloaded it early this morning, and it's very useful and helpful. Great app!

mp5 ,

Big fan already!

The app works great, I like the formula page and the tap drill calculator a lot. Will continue to use!

App Privacy

The developer, Motionics LLC, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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