Tap, Drill and Nut Chart is a free utility app developed by Greg A Miller for Android devices. This app is a handy tool for anyone who works with screws, bolts, and nuts. It provides a simple tap and drill chart with nut sizes and clearance holes. The app supports both Metric and US inch SAE systems, and it shows screw/bolt size, clearance holes, tap drills, and nut sizes/hex head size width across flats.

The app requires no permissions, and it is straightforward to use. The user interface is simple and intuitive, and the information is presented in an organized and easy-to-read manner. Whether you are a professional mechanic or a DIY enthusiast, this app is a useful tool to have in your toolbox.