ChipTip is designed and build for metal working enthusiasts. "Base" functionality package (this is what you'll buy on this page): B1. "Threads" screen allows you to find hole diameter for tapping particular internal thread (nut) and rod diameter (to be turned on lathe) for cutting of external thread (bolt).
Download the installation package of ChipTip 3.0 that is free of charge and read users' reviews on Droid Informer. The app is developed for Android 4.0.3 and higher. The download of this application doesn't contain viruses or any kind of malware. Denis V. Komissarov is the creator of ChipTip which refers to the Tools category.