A thread pitch diameter calculator calculates the diameter of a screw, at which the width of the thread running in a helix along the screw and the width of the spaces between threads are equal. This diameter is one of the properties that determines the optimal use of a screw.
To calculate the thread pitch diameter, enter the major diameter and the number of threads per inch of the screw into the calculator. The properties of standardized thread are already a part of the equation the calculator uses.
The thread pitch diameter helps to define what kind of hole the screw needs to function well.