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Drill Tap


This app is only available on the App Store for iOS devices.


This app can be used to calculate different size drills, taps, bolts, screws, and nuts. It is intended for approximate calculations and should be used for reference only.

Great reference for machinists, shops, designers, and engineers.

English: #0-80 through 1-1/2-18 (UNC, UNF, UNS, UNEF)
Metric: M1x0.25 through M30x1.5 course and fine

United National Coarse (UNC), United National Fine (UNF), United National Extra Fine (UNEF), United National Special (UNS), Metric Course, Metric Fine, Metric Extra Fine. Handy fraction to decimal drill chart and NPT / NPS pipe thread chart.

Table Chart for Keenserts Keylocking Thread Inserts.

What's New in Version 1.0.2

Added Table and Installation for Keenserts Keylocking Thread Inserts.

iPhone Screenshots

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Customer Reviews


Been using this for a while and thought I'd already reviewed it but i guess not. I want to thank the developer for his quick response when i asked if he could include keensert information. This is my #1 assistant in the shop. Very useful.


It's fine or smaller sizes but as a machinist doing oilfield work it seriously lacks. Sizes really start lacking after around .750. Recommend for hobby use. All numbers so far match up with my shop reference manuals and I would trust it overall.

Great app!

This is a great app for someone needing it. This one really has it all from very basic info to in depth dimensions of every type of screw, bolt, or bit

Drill Tap
View in iTunes
  • $0.99
  • Category: Utilities
  • Updated:
  • Version: 1.0.2
  • Size: 4.5 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 4.3 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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