Machine Screws Drill/Tap Info

308 reviews
Content rating
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About this app

**** Note Our App was designed for Android 8 and below ***
If your device is running Android 9 and up, our app may not work properly.
Verified working Samsung Galaxy S9, S10, Note 10+, LG G6 for example.
Working on an update, but is a full re-write in Kotlin and is taking a lot longer than expected. If you have purchased recently (after December 2019) and the app is not working on your device, and need a refund, please contact us at with your purchase details.

Android's first and best drill chart and tap drill information app for machine screws with thread sizes, tap drill diameter sizes, clearance holes, STI drill information, & suggested max torques. Handy fraction to decimal drill chart and NPT / NPS / BSPT / BSPP pipe thread charts included.

No special scroll wheels, great dimension graphic, fast drill chart, accurate - true data from the handbooks for the thread sizes you need.

Quick and easily searchable drill chart gives just about every standard drill bit size #0000-160 through 41.6 mm (1.6378) with associated screw size(s).

Great reference for machinists, shops, designers, engineers & at home use.

Supported screw sizes:
English: #0000-160 through 1-11/16-18 (UNC, UNF, UNS, UNEF, ME)
Metric: M0.30x0.08 through M36x3.0 course, fine, extra fine, and micro sizes
British: BA (#25 -> #0), BSF (3/16-32 -> 1-1/2 -8), BSW (1/16-60 ->1-1/2 -6) sizes

United National Coarse (UNC), United National Fine (UNF), United National Extra Fine (UNEF), United National Special (UNS), Metric Course, Metric Fine, Metric Extra Fine, (ME) Model Engineering, (BA) British Association Standard, (BSW) British Standard Whitworth, (BSF) British Standard Whitworth Fine

** Network Access is for Android Market License and to allow the application to go to the Web for "Support & Info" in the "About" Menu Button.

- English
- Españoles
- 한국

Localization support for:
- English
- Spanish
- Korean

---Things you should know---
• App developer doesn't participate in the purchase and download process, if you have problems with credit card authorization, charge, double charge, download failures, we have no way to help you, you'll need to check the Google technical help forum.

• Update is always free, Google controls charging and it WILL NOT charge for update.
Updated on
Jan 28, 2018

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
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Ratings and reviews

289 reviews
A Google user
November 15, 2019
This app has been invaluable to my fabrication endeavors until I updated to newer Android phone. Now I get an Android notice that it was designed for an older version and may not work. Please help. Thanks in advance, A dedicated user.
1 person found this review helpful
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November 17, 2019
Sorry for your trouble - an App update is in the works. Full App re-write thanks to Google updates & security changes
Robert “Bo” Jones
May 21, 2021
One of my most referenced apps! I have an OLD DoAll tap chart that has multi columns that I love (look by number type, not frac/dec/thread in same column) and this chart us same. Awesome!